What's New in Photon Counting CT? — August 07, 2026
AI-summarised digest of 41 PubMed articles on Photon Counting CT published in the last 7 days.
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What’s New in Photon Counting CT?
August 07, 2026 · 41 articles · 15 research themes · covering July 31, 2026 – August 07, 2026
Overview
Across this week’s set of studies and reviews, photon-counting CT (PCCT/PCD-CT) is repeatedly positioned as a practical upgrade to conventional energy-integrating CT—especially where spectral separation and spatial resolution matter. Multiple vascular and cardiac papers (coronary CCTA, tibial runoff, carotid plaque phenotyping, and neurovascular stent/ISR surveillance) converge on the same theme: improved characterization of calcified/iodinated mixtures and reduced blooming/artifact limitations can translate into better lesion localization, more reliable stenosis measurement, and potentially less reliance on invasive angiography. Complementing these clinical outcomes, engineering and methodological work (signal formation, threshold selection, differentiable material decomposition, and reconstruction/geometry effects) is rapidly maturing the “how” behind spectral imaging so that performance gains can be reproduced across scanners and protocols.
A second dominant thread is protocol and dose optimization for real-world constraints. Several studies focus on tuning reconstruction parameters (kernel sharpness, iterative reconstruction behavior, small-pixel effects, and spatial resolution choices) and on establishing dose–image quality trade-offs in vulnerable populations (neonates/infants with congenital heart disease, pediatric chest CT, and high-frequency follow-up settings such as lung transplant surveillance). Phantom and feasibility work further supports operational decisions: contrast-to-noise preservation when lowering virtual monoenergetic energy, guidance for contrast dose reduction rules, and evaluation of phantom fidelity for iodine quantification. Together, these results emphasize that PCCT benefits are not only hardware-dependent but also strongly governed by acquisition and reconstruction choices.
Finally, the digest highlights expanding biomarker and application horizons beyond angiography. Cardiac CT-derived extracellular volume (ECV) is reviewed and tested against MR and histopathology, while GI-focused evidence spans colorectal polyp detection and broader adult GI malignancy opportunities. Pulmonary embolism perfusion mapping and critical-care DECT/PCCT comparisons address the need for rapid, actionable functional imaging with minimized contrast exposure. Across these domains, the field is also moving toward workflow automation—using NLP/AI to route patients to appropriate PCCT protocols—suggesting that clinical adoption will increasingly depend on integrating spectral/technical capabilities into end-to-end decision pathways.
Photon-Counting CT Physics & Signal Formation
A physics primer on photon-counting detectors in CT: Physics, signal formation, and performance.
This physics primer reviewed the signal formation chain in photon-counting detector CT (PCD-CT), focusing on how threshold-bin data arise from x-ray interactions, charge creation, pulse processing, and threshold decisions rather than direct photon-energy readout. It highlights that understanding this detector-readout pipeline is essential to interpret spectral distortion, count loss, and instability under clinical operating conditions. The article is significant for clinicians and researchers because it provides the conceptual framework needed to correctly evaluate and troubleshoot PCD-CT performance and spectral outputs.
Chen GH, Lai R, Li K · Medical physics · (2026) · View on PubMed ↗ · Free PDF ↗
Spectral Reconstruction, Thresholding & Material Decomposition Methods
End-to-End Differentiable Photon Counting CT.
This engineering study developed an end-to-end differentiable photon-counting CT framework by making the material decomposition step (maximum-likelihood estimation, MLE) differentiable via the implicit function theorem and inserting it as a layer into the imaging chain. The key finding was that differentiable PCCT enables cross-domain learning and end-to-end optimization that leverages quantitative information in the image domain. This is scientifically significant because it supports training and optimizing upstream spectral/measurement models directly for quantitative material decomposition performance.
Wang S, Yang Y, Lee J et al. · IEEE transactions on medical imaging · (2026) · View on PubMed ↗
Approximate Cramér-Rao lower bound analyses for semi-optimal energy thresholds selection in photon counting CT.
This methodological study developed approximate Cramér–Rao lower bound (CRLB) approaches to select semi-optimal energy thresholds for photon-counting CT without requiring complete system models. Using threshold-scan look-up tables from reference slab phantoms to approximate dominant basis line integrals, the proposed linear and nonlinear methods enable practical threshold selection aimed at reducing noise in material decomposition. The significance lies in providing a feasible, data-driven way to tune photon-counting spectral acquisition for improved quantitative imaging performance in real systems.
Lee O · Medical physics · (2026) · View on PubMed ↗ · Free PDF ↗
Detector Geometry, Pixel Effects & Iterative Reconstruction Tuning
Small-pixel Acquisition Unmasks “Bucket Effects” of Iterative Reconstruction in Ultra-High-Resolution Photon-Counting CT.
This cadaveric-head study investigated how small detector pixels (“small pixel effect”) affect signal-to-noise behavior and subjective image quality in ultra-high-resolution photon-counting CT (UHR PCCT) under iterative reconstruction (IR), comparing UHR (120×0.2 mm) versus standard collimation (144×0.4 mm) across multiple dose levels. The key finding was that smaller pixels meaningfully unmask “bucket effects” of iterative reconstruction, altering noise and perceived image quality compared with standard collimation. These results are significant for optimizing reconstruction settings and detector geometry to maximize image quality in UHR PCCT without increasing dose.
Huflage H, Wech T, Patzer TS et al. · Academic radiology · (2026) · View on PubMed ↗
Protocol Optimization & Dose–Image Quality Trade-offs
Comparison of three commercial multi-energy CT and electron density phantoms for iodine quantification and tissue substitute characterization.
This phantom-based study compared three commercial multi-energy CT and electron density (ED) phantoms for iodine quantification and tissue substitute characterization, targeting both diagnostic imaging and radiation therapy calibration use cases. The key finding was that the phantoms differ in how accurately they represent iodine quantification and tissue substitute behavior relevant to diagnostic and treatment-planning contexts. This is significant because selecting an appropriate phantom improves the reliability of iodine quantification and material characterization when validating dual-energy CT and photon-counting CT workflows.
Omar A, Vorbau R, Zimmerman J et al. · Journal of applied clinical medical physics · (2026) · View on PubMed ↗
Obese patient imaging: Potential dose reduction with photon-counting CT.
This phantom study compared cadmium-zinc-telluride (CZT) photon-counting CT (PCCT) versus energy-integrating detector CT (EID-CT) for dose efficiency in obese patient simulations using 3D-printed pancreas and tissue-mimicking phantoms across extension rings representing adult waist percentiles (50th, 75th, 85th, 95th) and CTDIvol values from 0.5 to 19.4 mGy. The key finding was that PCCT can improve dose efficiency (noise performance per dose) relative to EID-CT across larger phantom sizes. This is clinically significant because it supports PCCT as a strategy to maintain diagnostic image quality while reducing radiation dose in obese patients.
Liu LP, Mei K, Sharma S et al. · Journal of applied clinical medical physics · (2026) · View on PubMed ↗ · Free PDF ↗
Photon Counting CT of the Head: Retrospective Analysis of Image Quality and Dose in Comparison to Energy Integrating Detector CT.
This retrospective study compared non-contrast head CT (NCCT) performed with photon-counting detector CT (PCD-CT) at 120 and 140 kVp across varying radiation doses versus NCCT performed on a modern energy-integrating detector CT (EID-CT) system. The key finding was that PCD-CT acquisition parameters (kVp and dose) produced measurable differences in quantitative image quality while enabling dose–image quality trade-offs relative to EID-CT. These results support protocol optimization for emergency NCCT using PCD-CT to potentially reduce radiation dose without sacrificing diagnostic image quality.
Schoenbeck D, Kroeger JR, Moenninghoff C et al. · Academic radiology · (2026) · View on PubMed ↗ · Free PDF ↗
A Practical Rule-of-Thumb to Adapt Contrast Media Dose in Photon-counting Detector CT: The 10-to-5 Rule.
This phantom-based experimental study developed a practical “10-to-5 rule” for adapting contrast medium dose in photon-counting detector CT (PCD-CT) when lowering virtual monoenergetic image (VMI) reconstruction energy to maintain parenchymal CT/CTA contrast-to-noise ratio (CNR). Using spectral abdominal and chest CT phantoms with iodine-in-water equivalent rods scanned on a first-generation dual-source PCD-CT, the study found that reducing contrast dose according to the rule preserved CNR despite energy changes. Clinically, this offers a simple method to reduce contrast dose in PCD-CT protocols without sacrificing spectral contrast performance.
Jeukens CRLPN, Martens B, Vandewall J et al. · Investigative radiology · (2026) · 1 citations · View on PubMed ↗ · Free PDF ↗
Pediatric & Special-Population Imaging Optimization
Optimizing Photon-counting CT for Congenital Heart Disease: The Value of Ultrasharp Kernels in Neonates and Infants.
This retrospective study evaluated how kernel sharpness (KS) and iterative reconstruction (IR) settings affect high-pitch photon-counting detector CT image quality in neonates and infants with congenital heart disease. Images reconstructed with ultrasharp vascular kernels (varying KS values) and different IR levels showed improved visual image quality ratings, supporting an optimized reconstruction strategy for pediatric cardiac photon-counting CT. These findings are clinically significant because they provide practical parameter guidance to maximize diagnostic image quality while preserving dose efficiency in the most vulnerable pediatric population.
Salam B, Sprinkart AM, Hart C et al. · Radiology. Cardiothoracic imaging · (2026) · View on PubMed ↗
Dose optimization for pediatric chest CT: a comparative study of energy-integrating and photon-counting detector CT using 70 kV and 100 kV protocols with tin filtration regarding image quality and dose exposure.
This comparative phantom-and-clinical study evaluated pediatric chest CT dose and image quality between energy-integrating CT (EICT) and photon-counting CT (PCCT) using 70 kV and 100 kV protocols with tin filtration (100Sn), with dose measured using thermoluminescent dosimeters (TLDs) and clinical data analyzed for CTDIvol, DLP, organ dose coefficients, and effective dose (ICRP 103) at constant image quality. The key finding was that PCCT could achieve different (generally lower) radiation dose outcomes while maintaining comparable image quality relative to EICT under the tested pediatric protocols. This is important for pediatric radiation safety because it supports selecting PCCT settings that reduce exposure without compromising diagnostic performance.
Kunert P, Weis M, Schlattl H et al. · European journal of radiology · (2026) · View on PubMed ↗ · Free PDF ↗
Ultra-high resolution photon-counting CT of the lung after lung transplantation: should we go for optimal image quality or reduced radiation dose?
In a cohort of 100 lung-transplant recipients, this study compared ultra-high-resolution photon-counting CT (UHR-PCCT; 0.4 mm) with high-resolution energy-integrating detector CT (HR-EIDCT; 1.0 mm) using two image-quality targets (IQ100 and reduced-dose IQ40) against prior EIDCT performed within 14 months. The key finding was that UHR-PCCT performance could be evaluated across both normal and reduced radiation dose settings, informing whether optimal image quality or dose reduction better meets follow-up needs after transplantation. This is clinically significant because it supports tailoring PCD-CT protocols for frequent post-transplant surveillance where minimizing cumulative radiation is critical.
Dubbeldam A, Van Ballaer V, Verschakelen J et al. · JHLT open · (2026) · View on PubMed ↗ · Free PDF ↗
Cardiac CT Angiography (Coronary) Clinical Performance
Comparative review of coronary CT angiography versus conventional catheter angiography: diagnostic value, clinical outcomes, and underlying technical principles.
This comparative review synthesized evidence on coronary CT angiography (CCTA) versus conventional catheter angiography (ICA), including how emerging photon-counting detector CT (PCD-CT) may change diagnostic performance and technical limitations. It concludes that while ICA remains a reference standard for certain clinical decisions, CCTA increasingly supports noninvasive risk stratification and that PCD-CT could further improve image quality and characterization. The review is clinically significant because it frames where photon-counting CT may most effectively augment coronary imaging pathways and outcomes.
Masri S, Sezdi M · Expert review of medical devices · (2026) · View on PubMed ↗
Deep Learning-Based Automated Coronary Plaque Quantification with Ultra-high Resolution Photon-Counting Detector CT at Different Spatial Resolutions.
In a prospective single-center study of 70 patients with suspected coronary artery disease undergoing ultra-high resolution photon-counting detector CT coronary CT angiography (UHR-CCTA), datasets were reconstructed at three spatial resolutions (0.6 mm SR, 0.4 mm HR, 0.2 mm UHR) and evaluated by two radiologists plus a deep-learning (DL) automated plaque/stenosis quantification tool. The key finding was that changing spatial resolution affected subjective image quality and the DL-derived quantification of coronary stenosis and plaque volumes. This is clinically significant because it identifies how reconstruction resolution should be selected to maximize both diagnostic image quality and automated quantitative performance in PCD-CT coronary imaging.
Liu Y, Li R, Zhang H et al. · Academic radiology · (2026) · 1 citations · View on PubMed ↗ · Free PDF ↗
Improved coronary CT angiography image quality using photon-counting detector CT in SCAPIS reexamination: scan protocol and comparative analysis.
This study described the photon-counting detector CT (PCD-CT) coronary CT angiography (CCTA) scan protocol in the SCAPIS reexamination population (15,000 participants; analysis included 1,147 participants) and compared diagnostic image quality, Agatston scores, and stenosis grading against energy-integrating detector CT (EID-CT) from SCAPIS baseline. The key finding was that PCD-CT CCTA produced diagnostic image quality and quantitative measures (Agatston score and degree of stenosis) that were assessable for comparability with EID-CT. This matters for large-scale population screening and longitudinal follow-up by validating whether PCD-CT can be substituted or harmonized with EID-CT for coronary risk quantification.
Lidén M, Nyberg G, Aurumskjöld ML et al. · European journal of radiology · (2026) · View on PubMed ↗ · Free PDF ↗
Photon-counting CT in cardiac imaging: multi-institutional guidance on technical principles, clinical evidence, and practical protocols.
This multi-institutional guidance article synthesized technical principles and clinical evidence for photon-counting detector CT (PCD-CT) in cardiac imaging, focusing on coronary CT angiography (CCTA) protocols, reconstruction choices (including ultrahigh-resolution modes), and performance in challenging scenarios such as stents and heavily calcified plaque. The key finding was that PCD-CT’s direct energy discrimination and ultrahigh spatial resolution can improve coronary lumen visualization and spectral imaging compared with energy-integrating detector CT (EID-CT), with practical protocol recommendations derived from contemporary studies. This is clinically significant because it translates emerging PCD-CT capabilities into actionable scanning and reconstruction workflows for routine cardiac CT.
Hagar MT, Vecsey-Nagy M, Kravchenko D et al. · European journal of radiology · (2026) · 3 citations · View on PubMed ↗
Pictorial review: a step-by-step guide to coronary CT angiography with photon-counting detector CT.
This pictorial review provided a step-by-step, decision-tree style guide for performing coronary CT angiography with photon-counting detector CT (PCD-CT) in clinical practice. The key finding was that structured protocol decision-making (based on patient and scan factors) can leverage PCD-CT’s improved coronary plaque component differentiation and potential radiation reductions versus energy-integrating detector CT (EID-CT). This is significant because it helps standardize adoption of PCD-CT coronary scanning parameters and reduces variability during early implementation.
Xie C, Clarke N, Kotronias R et al. · The British journal of radiology · (2026) · View on PubMed ↗ · Free PDF ↗
Cardiac CT-Derived Biomarkers (ECV/Fibrosis)
Extracellular volume fraction by cardiac computed tomography (ECVCT): opportunities and challenges for clinical implementation.
This review article assessed the clinical opportunities and challenges of implementing cardiac CT-derived extracellular volume fraction (ECVCT) using single-energy CT and spectral CT approaches including photon-counting CT (PCCT). The key finding was that ECVCT correlates well with cardiac magnetic resonance (CMR) measures across disease cohorts, and PCCT may reduce dependence on a separate true non-contrast scan by using energy-resolved data. This is significant for translating CT-based fibrosis and amyloid-related biomarkers into routine clinical practice while addressing practical implementation barriers.
Gray R, Rauseo E, Herrey A et al. · European heart journal. Imaging methods and practice · (2026) · View on PubMed ↗
Photon-counting CT Extracellular Volume Fraction for Liver Fibrosis Assessment: Validation against MR Elastography and Histopathology.
This prospective study evaluated photon-counting CT (PCCT) extracellular volume fraction (ECV) for liver fibrosis staging by correlating PCCT-derived ECV with MR elastography liver stiffness measurements (LSM) and comparing diagnostic performance against histopathology. The key finding was that PCCT-derived ECV is feasible for fibrosis assessment and shows measurable agreement with MR elastography and histopathologic staging in a cohort of 157 participants with suspected hepatic malignancies. Clinically, this supports PCCT as a potential noninvasive alternative or complement to MR elastography for liver fibrosis evaluation.
Wu X, Li J, Deng R et al. · Radiology · (2026) · View on PubMed ↗
Peripheral Artery Disease & Vascular Imaging (PAD/PVAT/Runoff)
Photon-counting detector computed tomography angiogram more accurately characterizes lower extremity runoff than traditional computed tomograph angiogram.
This retrospective study compared photon-counting CT angiography (PCD-CT) with conventional energy-integrating CT angiography (EID-CTA) against on-table angiography for characterizing lower-extremity tibial artery runoff in patients evaluated for potential bypass. PCD-CT more accurately identified the target tibial artery than EID-CTA, with fewer discrepancies versus angiography (2/43 vs 10/46; 4.6% vs 21.7%, P=.03). The findings are important because improved tibial artery identification can directly affect surgical planning and procedural success in peripheral arterial disease.
MacArthur TA, Rajiah PS, Schaller MS · Journal of vascular surgery cases and innovative techniques · (2026) · View on PubMed ↗ · Free PDF ↗
Technical advances and clinical impact of photon-counting computed tomography angiography for peripheral artery disease.
This narrative review summarized technical advances and clinical evidence for photon-counting computed tomography angiography (PCCTA) in peripheral artery disease (PAD). It emphasizes that PCCTA can reduce limitations of conventional CTA—such as calcium blooming and beam hardening—thereby improving image quality and diagnostic accuracy in small, heavily calcified vessels. The significance is that it consolidates current evidence supporting PCCTA as a promising imaging upgrade for PAD diagnosis, procedural planning, and follow-up.
Zivkovic M, Raskin D, Ghibes P et al. · Journal of vascular surgery cases and innovative techniques · (2026) · View on PubMed ↗ · Free PDF ↗
Carotid Imaging: Current Concepts and Advanced Imaging.
This review article summarized current and advanced imaging approaches for carotid atherosclerosis, emphasizing that plaque vulnerability depends on biology (e.g., intraplaque hemorrhage, lipid-rich necrotic core, fibrous cap rupture, ulceration, and inflammation) rather than stenosis alone. It highlighted multimodal imaging—including photon-counting CT (PCCT)—as complementary tools for plaque phenotyping beyond luminal measurements. The clinical significance is improved risk stratification for ischemic stroke by targeting high-risk plaque features with advanced spectral and molecular imaging.
Saba L, Pinna A, Suri JS et al. · Seminars in neurology · (2026) · View on PubMed ↗
Neurovascular Imaging (Stents/ISR/Aneurysm/Carotid)
Diagnostic Performance of Photon-Counting Detector CT Angiography in the Detection of Cerebral and Carotid Artery Stenosis.
This prospective cohort study compared ultra-high-resolution photon-counting detector CT angiography (UHR PCD-CTA) with standard-resolution (SR) CTA for detecting cerebral and carotid artery stenosis, using digital subtraction angiography (DSA) as the reference standard. The key finding was that UHR PCD-CTA provides diagnostic performance for stenosis assessment that can be benchmarked against SR-CTA reconstructions from the same raw data. Clinically, this supports evidence-based selection of UHR photon-counting CTA reconstructions for improved evaluation of vascular stenosis.
Li Z, Jiang H, Zhang Y et al. · AJNR. American journal of neuroradiology · (2026) · View on PubMed ↗ · Free PDF ↗
Ultra-High-Resolution Photon-Counting CT Angiography for Noninvasive Detection of Neurovascular In-Stent Restenosis.
This prospective study evaluated ultra-high-resolution photon-counting detector CT angiography (UHR PCD-CTA) for noninvasive detection of neurovascular in-stent restenosis (ISR) in consecutive patients after neurovascular stent implantation. Compared with simulated energy-integrating detector CTA reconstructions, UHR PCD-CTA was designed to overcome blooming artifacts and limited spatial resolution that hinder ISR detection on conventional CTA. The clinical significance is that improved noninvasive ISR detection could reduce reliance on invasive angiography and enable more timely post-stent surveillance.
Su CQ, Zhou C, Wu PF et al. · Stroke · (2026) · View on PubMed ↗ · Free PDF ↗
Ultra-high resolution Photon-Counting CTA for follow-up assessment of intracranial aneurysms after flow diverter: Initial experience.
This prospective study enrolled 47 participants treated with flow diverters and performed follow-up photon-counting CT angiography (PCCTA) using ultra-high-resolution (UHR) and standard-resolution (SR) reconstructions, with blinded reader assessment of aneurysm size and occlusion/neck coverage metrics and comparison to digital subtraction angiography (DSA). The key finding was that UHR-PCCTA provided improved visualization and artifact reduction for comprehensive post-flow-diverter assessment compared with SR-PCCTA and was benchmarked against DSA. This is significant because it suggests a less invasive imaging pathway for monitoring flow-diverter-treated intracranial aneurysms with higher spatial detail.
Li R, He N, Cui Y et al. · European journal of radiology · (2026) · View on PubMed ↗
Photon-counting CT characterization of carotid perivascular adipose tissue: a layer-by-layer quantitative analysis. A preliminary analysis in an asymptomatic population.
This retrospective preliminary study used photon-counting CT (PCCT) angiography in 20 asymptomatic patients and applied a custom Python algorithm to segment carotid perivascular adipose tissue (PVAT) into concentric layers for layer-by-layer quantification. The key finding was that PCCT can characterize PVAT spatial behavior and variability across PVAT layers in an asymptomatic cohort. Scientifically, this supports PCCT-based PVAT phenotyping as a potential imaging biomarker for vascular inflammation and plaque vulnerability.
Saba L, Alkadhi H, Maffei E et al. · European radiology · (2026) · 1 citations · View on PubMed ↗ · Free PDF ↗
Pulmonary Imaging & Perfusion (Pulmonary Embolism/ARDS)
Photon-counting CT versus energy-integrating CT of the chest in acute respiratory distress syndrome: A retrospective observational study of image quality and radiation exposure.
In a retrospective observational design, ARDS patients underwent both contrast-enhanced chest photon-counting detector CT (PCD-CT) and energy-integrating detector CT (EID-CT) in an intraindividual comparison. The key finding was that PCD-CT altered image quality and radiation exposure metrics compared with EID-CT in critically ill ARDS patients. This is significant because it provides evidence for dose optimization and potential image-quality gains of PCD-CT in a high-risk clinical setting where repeated imaging is common.
Rosok D, Opitz M, Bos D et al. · Emergency radiology · (2026) · View on PubMed ↗ · Free PDF ↗
Comparative accuracy of photon-counting and dual energy CT pulmonary angiography perfusion mapping using V/Q scans as reference standard.
This retrospective study compared photon-counting detector CT (PCD-CT) versus dual-energy CT (DECT) perfusion mapping for pulmonary embolism across two patient cohorts, using ventilation–perfusion (V/Q) SPECT/CT as the reference standard. PCD-CT and DECT perfusion maps showed diagnostic performance that could be quantified against V/Q SPECT/CT, with iodine density reference values derived to support interpretation of perfusion measurements. The results are clinically relevant because they indicate whether spectral CT perfusion mapping can reliably substitute for or complement V/Q SPECT/CT in diverse emergency indications.
Ogbonna A, Chamberlin JH, Baruah D et al. · Emergency radiology · (2026) · View on PubMed ↗ · Free PDF ↗
Dual-energy and photon-counting computed tomography in critical care.
This narrative review synthesized evidence on dual-energy CT (DECT) in critical care, focusing on how two-energy acquisition enables material decomposition (e.g., iodine maps and virtual non-contrast images) to improve diagnostic performance while reducing contrast dose and radiation exposure. The key finding is that DECT-derived functional reconstructions—especially iodine perfusion maps for pulmonary embolism—can provide rapid, clinically actionable anatomical and functional assessment in critically ill patients. This is significant because it frames DECT as a potentially life-saving imaging strategy when minimizing contrast exposure is essential.
Freed A, Bogot NR, Einav S · Journal of critical care · (2026) · 1 citations · View on PubMed ↗
Gastrointestinal Imaging (GI Oncology/Polyps)
Improved pancreatic imaging with photon-counting CT: a retrospective comparison with conventional CT.
This retrospective study assessed whether photon-counting CT (PCCT) improves pancreatic imaging compared with conventional energy-integrating CT (EIDCT) in 35 patients scanned in multiple contrast phases. PCCT yielded better subjective image quality across 11 peripancreatic regions and showed quantitative differences in density and noise measured by a single reader. The clinical significance is that photon-counting CT may enhance visualization of pancreatic pathology while potentially improving image quality metrics relevant to diagnosis.
Brandt EGS, Christoph Müller F, Nielsen YJ et al. · Acta radiologica (Stockholm, Sweden : 1987) · (2026) · View on PubMed ↗
Photon-counting CT in gastrointestinal malignancies: a scoping review.
This scoping review mapped and synthesized clinical evidence (PRISMA-ScR framework; search January 2017–December 2025) on photon-counting CT (PCCT) applications in adult gastrointestinal (GI) malignancies. The key finding was that the available studies collectively suggest PCCT advantages such as improved spatial resolution and contrast-to-noise ratio with potential radiation dose reduction, while also highlighting heterogeneity in indications and study designs. This is significant for guiding future clinical trials and for clinicians to understand where PCCT evidence is strongest in GI oncology.
Spoto F, Robertis R, Monterubbiano L et al. · European journal of radiology · (2026) · View on PubMed ↗
Diagnostic performance of photon-counting detector CT versus energy-integrating detector CT for colorectal polyp detection: a phantom study.
This phantom study compared photon-counting detector CT (PCD-CT) with energy-integrating detector CT (EID-CT) for colorectal polyp detection using 84 histopathologically confirmed polyps in a sequential scan design. The key finding was that PCD-CT provided diagnostic performance and image-quality metrics (including SNR/CNR and radiologist detection sensitivity/confidence) that could be benchmarked against EID-CT across polyp size categories (≤5 mm, 6–9 mm, ≥10 mm). This is significant because it provides controlled evidence on whether photon-counting CT improves colorectal polyp detectability relative to conventional CT systems.
Wu X, Gao H, Gao Y et al. · Abdominal radiology (New York) · (2026) · View on PubMed ↗
Musculoskeletal & Trauma Imaging (Bone/Joint)
Multireader Comparison of Photon-Counting Detector CT Reconstructions for Evaluation of Temporal Bone Cochlear Implants.
This multireader study evaluated six different photon-counting CT reconstruction approaches for temporal bone imaging in patients with cochlear implants, using 20 patients (24 implants) scanned on a NAEOTOM Alpha photon-counting CT system. The key finding was that reconstruction algorithm choice meaningfully affects image quality/diagnostic evaluation of cochlear implant temporal bone imaging in a reader-based comparison. This is significant for establishing optimal PCCT reconstruction parameters to improve CI visualization and potentially reduce uncertainty in clinical temporal bone assessment.
Dogra S, O’Donnell T, Nayak G et al. · AJNR. American journal of neuroradiology · (2026) · 1 citations · View on PubMed ↗
Musculoskeletal Computed Tomography Imaging: A 30-Year Perspective.
This 30-year perspective review described how musculoskeletal computed tomography (CT) evolved and highlighted the role of spectral CT and other advanced CT techniques in improving characterization and artifact reduction. It discusses how innovations such as spectral CT for crystal/marrow assessment and metal artifact reduction, along with specialized CT approaches (e.g., weight-bearing cone-beam CT and CT arthrography), expanded CT’s clinical utility beyond static bone evaluation. The significance is that it provides a high-level scientific roadmap for how emerging CT technologies—including spectral methods—translate into better musculoskeletal diagnosis and management.
Omoumi P, Pastor M, Demehri S et al. · Seminars in musculoskeletal radiology · (2026) · View on PubMed ↗
Dual-energy CT for detection of knee fractures as alternative to MRI.
This narrative review assessed dual-energy CT (DECT) as an alternative to MRI for acute knee fracture detection, focusing on DECT’s virtual non-calcium reconstructions and spectral analysis. The key finding is that DECT can detect clinically relevant fracture patterns and bone marrow edema surrogates (via spectral techniques) and can incorporate metal artifact reduction and soft-tissue assessment in selected scenarios. This is significant because it supports DECT as a faster, more widely available imaging option for knee trauma when MRI is not feasible.
Foti G, Tripodi G, Ocello G et al. · Skeletal radiology · (2026) · 1 citations · View on PubMed ↗
“Trabecular Architecture of the Medullary Cavity: A Comprehensive Review of Radiological Patterns, Pathological Alterations”.
This narrative review studied the trabecular bone architecture of the medullary cavity and how its normal and pathological radiological patterns can be assessed in clinical imaging, spanning modalities such as high-resolution MRI, dual-energy CT, and emerging photon-counting detector CT. It found that medullary trabecular changes—including thickening, breakage, faintness, rarefaction, and infiltration—can be characterized across scales and that imaging choice affects diagnostic precision, with clinical indices such as the Singh Index used to quantify alterations. The review’s significance is that it consolidates current and emerging imaging approaches for detecting and interpreting medullary trabecular pathology, supporting improved assessment of skeletal integrity and disease-related bone remodeling.
Chapala S, Kiyawat V, Gibson J et al. · The British journal of radiology · (2026) · View on PubMed ↗ · Free PDF ↗
Dental/Endodontic Imaging & Metal Artifact Mitigation
Photon-Counting Detector CT-Based Virtual Monoenergetic Imaging With Metal Artifact Reduction for Endodontic Diagnostics.
This ex vivo study used photon-counting detector CT (PCD-CT) virtual monoenergetic imaging (VMI) with iterative metal artifact reduction (iMAR) to optimize reconstruction energy (70–190 keV) in 16 extracted third molars with simulated endodontic diagnostic challenges. The study found that selecting an appropriate VMI energy level and applying iMAR improved depiction quality and reduced metal artifact severity for assessing endodontic complications at radiation doses comparable to standard-dose cone-beam CT. These findings support using PCD-CT VMI plus iMAR to improve diagnostic reliability in endodontics where metallic materials can degrade image interpretation.
Al-Haj Husain A, Dogan S, Mergen V et al. · International dental journal · (2026) · 1 citations · View on PubMed ↗ · Free PDF ↗
Contrast Agents & K-edge / High-Z Strategies
K-Edge imaging using a clinical dual-source photon-counting CT system.
This phantom feasibility study tested K-edge imaging of iodine (I) and gadolinium (Gd) on a clinical dual-source photon-counting CT system with four energy thresholds (20, 55, 72, 90 keV). The key finding was that K-edge imaging using a clinically available PCCT configuration can successfully perform multi-material decomposition for I and Gd. This is significant because it demonstrates practical feasibility of K-edge-based dual-contrast strategies that could reduce dose and motion artifacts compared with sequential scans.
Rybertt MV, Liu LP, Sahbaee P et al. · Journal of applied clinical medical physics · (2026) · View on PubMed ↗
Mixed coronary plaque phantom analysis by photon-counting CT: impact of calcium and iodine on low-attenuation plaque detection.
This phantom study compared photon-counting detector CT (PCD-CT) with energy-integrating detector CT (EID-CT) for detecting low-attenuation plaque (LAP) under controlled variations of calcium and iodine using mixed-plaque inserts. PCD-CT improved LAP detection relative to EID-CT, with performance influenced by the presence of calcified arcs and iodinated components and assessed across virtual monoenergetic reconstructions (40–130 keV) and different kernels (soft Qr40 vs sharp Qr72). The results are scientifically important because they clarify how photon-counting spectral imaging can mitigate calcium/iodine-related confounding and improve detection of subtle plaque features relevant to coronary artery disease risk stratification.
Szilveszter B, Kolossváry M, Kubovje A et al. · European heart journal. Imaging methods and practice · (2026) · View on PubMed ↗ · Free PDF ↗
Experimental Evaluation of a Hybrid Iodine-Gadolinium Contrast Medium in Photon-counting Detector CT.
This in vitro experimental study evaluated BAY3685750, a hybrid iodine–gadolinium contrast medium, in photon-counting detector CT (PCD-CT) using an anthropomorphic abdominal phantom and compared it with conventional iodine-based and gadolinium-based agents. The key finding was that BAY3685750’s higher effective k-edge behavior improved spectral contrast performance in PCD-CT virtual monoenergetic imaging at energies where standard iodine contrast diminishes. This is significant because it suggests a contrast-agent strategy to enhance high-energy VMI quality in PCD-CT angiography and other spectral applications.
Haag F, Rink J, Lohrke J et al. · Investigative radiology · (2026) · View on PubMed ↗
High-Z Contrast Media for Coronary Photon-counting Detector CT Angiography: Improved Quantification of Calcified Stenoses.
This phantom study tested whether high-Z contrast media (higher atomic number than iodine) can preserve vascular contrast when using high-energy virtual monoenergetic images (VMIs) in photon-counting detector CT coronary angiography. By using small-diameter vessel-mimicking rods and assessing calcified-stenosis quantification, the study found that high-Z agents reduced calcium blooming limitations and improved the accuracy of stenosis measurements compared with iodine under high-energy VMI conditions. The clinical significance is more reliable coronary stenosis quantification in the presence of calcification, potentially reducing overestimation driven by blooming artifacts.
Demmert TT, Klambauer K, Schmidt B et al. · Investigative radiology · (2026) · View on PubMed ↗ · Free PDF ↗
AI, Automation & Workflow Integration for PCCT
Automatic Patient Eligibility for Photon-counting CT Using Discriminative and Generative AI Models in Neuroradiology.
This retrospective neuroradiology study evaluated whether NLP-based large language models could automatically route Spanish-language CT requests to photon-counting CT (PCCT) versus conventional energy-integrating detector (EID) CT. The key finding was that discriminative and generative AI models can be used to automate PCCT eligibility decisions, addressing the impracticality of manual routing when PCCT produces many images per study. Automating CT-technology selection could improve workflow efficiency and ensure patients receive the most appropriate spectral PCCT acquisition in clinical neuroradiology.
Martín-Noguerol T, López-Úbeda P, Escartín J et al. · Academic radiology · (2026) · View on PubMed ↗
Generated automatically on August 07, 2026. Covers PubMed articles published July 31, 2026 – August 07, 2026. Summaries are AI-generated; always consult the original publication for clinical or research decisions.