What's New in Photon Counting CT? — August 04, 2026
AI-summarised digest of 37 PubMed articles on Photon Counting CT published in the last 7 days.
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What’s New in Photon Counting CT?
August 04, 2026 · 37 articles · 15 research themes · covering July 28, 2026 – August 04, 2026
Overview
Across this week’s set of papers, photon-counting CT (PCCT) emerges as a platform for more accurate, dose-aware imaging—especially where conventional CT struggles with spectral separation, blooming, and spatial resolution limits. Multiple studies and guidance documents focus on coronary and vascular applications, showing that PCCT/PCCTA can improve stenosis grading, reduce calcium blooming effects, and better characterize plaque components (including low-attenuation plaque). Complementing this, several works address practical implementation: reconstruction choices (kernel sharpness and iterative reconstruction), ultra-high-resolution protocols, and workflow-oriented protocol decision-making for coronary CTA.
A second dominant theme is spectral/material performance—driven by both detector physics and contrast engineering. Physics primers and threshold-selection methods highlight that PCCT’s threshold-bin outputs are shaped by detector-electronics effects, motivating careful reconstruction and energy-threshold optimization for reliable material decomposition. In parallel, phantom and in vitro studies explore contrast strategies (high-Z iodine alternatives, iodine/gadolinium K-edge separation, and hybrid agents) and provide rule-of-thumb approaches to reduce contrast dose while preserving contrast-to-noise. Together, these efforts aim to make spectral imaging more robust for real clinical tasks.
Finally, the evidence base is broadening beyond coronary disease into cerebrovascular, peripheral vascular, musculoskeletal, ENT, and oncology domains, often with the same underlying goal: better visualization of subtle pathology while minimizing artifacts and radiation. Examples include improved detection of carotid stenosis and perivascular adipose tissue characterization, more comprehensive post–flow-diverter follow-up, improved LAA thrombus detection in acute stroke workups, and enhanced implant migration measurement. Reviews and feasibility studies also consolidate how spectral CT can support critical-care and emergency workflows, while GI-focused evidence mapping and polyp-detection phantoms suggest PCCT’s potential for earlier cancer screening and detection.
Photon-Counting CT Physics & Detector Spectral Behavior
A physics primer on photon-counting detectors in CT: Physics, signal formation, and performance.
This physics primer article reviewed how photon-counting detectors in CT generate threshold-bin data, describing the signal formation chain from x-ray interaction and charge creation through pulse processing and threshold decisions. It emphasized that threshold-bin outputs are not a direct readout of photon energy and that detector-electronics effects can cause spectral distortion, count loss, and instability under clinical operating conditions. Understanding this end-to-end physics is essential for correctly interpreting PCCT images and for designing/validating reconstruction and material-decomposition methods.
Chen GH, Lai R, Li K · Medical physics · (2026) · View on PubMed ↗ · Free PDF ↗
Energy Threshold Optimization & Spectral Reconstruction Methods
Approximate Cramér-Rao lower bound analyses for semi-optimal energy thresholds selection in photon counting CT.
This Medical Physics study developed approximate Cramér–Rao lower bound (CRLB) methods to select semi-optimal energy thresholds in photon-counting CT without requiring full system models. Using look-up tables generated from threshold-scan counts on reference slab phantoms, the proposed linear and nonlinear approaches estimated threshold settings that reduce noise in material decomposition. A practical threshold-selection framework could improve PCCT performance in real systems where complete calibration models are unavailable.
Lee O · Medical physics · (2026) · View on PubMed ↗ · Free PDF ↗
Contrast Media & K-edge / High-Z / Hybrid Contrast for PCCT
K-Edge imaging using a clinical dual-source photon-counting CT system.
This feasibility study evaluated K-edge imaging of iodine (I) and gadolinium (Gd) using a clinical dual-source photon-counting CT system with four energy thresholds (20, 55, 72, and 90 keV) in phantom experiments. The authors demonstrated that clinically available PCCT energy-bin data can support multi-material K-edge decomposition for I/Gd separation with measurable performance in phantom conditions. If translated clinically, K-edge imaging could enable dual-contrast applications that reduce radiation dose and motion artifacts compared with sequential dual-energy or dual-scan strategies.
Rybertt MV, Liu LP, Sahbaee P et al. · Journal of applied clinical medical physics · (2026) · View on PubMed ↗
A Practical Rule-of-Thumb to Adapt Contrast Media Dose in Photon-counting Detector CT: The 10-to-5 Rule.
This phantom study developed a practical “10-to-5 rule” for adapting contrast medium (CM) dose in photon-counting detector CT (PCD-CT) when lowering reconstructed virtual monoenergetic image (VMI) energy while maintaining 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 (portal venous phase abdominal and high-pitch CTA), the key finding was that CM dose can be reduced according to the rule-of-thumb without substantially compromising CNR for parenchymal CT and CTA. Clinically, this offers a simple method to reduce contrast exposure in PCD-CT protocols while preserving diagnostic contrast performance.
Jeukens CRLPN, Martens B, Vandewall J et al. · Investigative radiology · (2026) · 1 citations · 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 a hybrid iodine–gadolinium contrast medium (BAY3685750) for 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 and spectral properties improved contrast performance in virtual monoenergetic images at higher energies compared with standard iodine-based contrast. This is significant because it suggests a pathway to enhance high-energy spectral CT contrast in PCD-CT, potentially improving lesion conspicuity and material differentiation.
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 evaluated whether high-Z (atomic number higher than iodine) contrast media improve quantification of calcified coronary stenoses on photon-counting detector CT (PCD-CT) using high virtual monoenergetic image (VMI) energy levels. High-Z contrast preserved vascular contrast at high VMI energies while reducing calcium blooming, leading to more accurate stenosis severity measurements compared with iodine-based contrast under the same high-energy VMI conditions. These findings support using high-Z contrast media to improve CCTA/PCD-CT assessment of calcified coronary disease where blooming artifacts otherwise bias stenosis grading.
Demmert TT, Klambauer K, Schmidt B et al. · Investigative radiology · (2026) · View on PubMed ↗ · Free PDF ↗
Dose Efficiency & Pediatric/Obese/Protocol Optimization
Obese patient imaging: Potential dose reduction with photon-counting CT.
This phantom study compared cadmium-zinc-telluride (CZT) photon-counting CT (PCCT) against energy-integrating detector CT (EID-CT) across increasing patient sizes modeled by 3D-printed pancreas phantoms in extension rings corresponding to adult waist percentiles (50th, 75th, 85th, 95th). Across CTDIvol values (0.5–19.4 mGy), PCCT demonstrated improved dose efficiency (noise performance per dose) relative to EID-CT, particularly as phantom size increased. These results suggest PCCT can better maintain image quality in obese patients, supporting lower-dose protocols without sacrificing diagnostic accuracy.
Liu LP, Mei K, Sharma S et al. · Journal of applied clinical medical physics · (2026) · View on PubMed ↗ · Free PDF ↗
Optimizing Photon-counting CT for Congenital Heart Disease: The Value of Ultrasharp Kernels in Neonates and Infants.
This retrospective study optimized kernel sharpness (KS) and iterative reconstruction (IR) settings for high-pitch photon-counting detector CT in neonates and infants with congenital heart disease, using reconstructions at 1-mm thickness with vascular kernels spanning KS 36–60 and IR levels Q1–Q4. Reader-based visual scoring identified specific ultrasharp kernel and IR combinations that produced the best overall image quality for pediatric cardiac imaging. Establishing these reconstruction targets can improve diagnostic image quality in the most dose-sensitive population while leveraging photon-counting CT’s spatial resolution advantages.
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 optimized pediatric chest CT dose by comparing energy-integrating CT (EICT) and photon-counting CT (PCCT) using 70 kV and 100 kV protocols with tin filtration (100Sn) in a one-year-old anthropomorphic phantom. It used thermoluminescent dosimeter (TLD) measurements and clinical dose metrics (CTDIvol, DLP, organ dose coefficients, and effective dose using ICRP 103) to assess image quality and radiation exposure at constant image quality. The key significance is that it provides quantitative evidence for selecting PCCT settings that may reduce pediatric radiation dose without compromising diagnostic image quality.
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?
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) at normal (IQ100) and reduced radiation dose (IQ40) in 100 lung-transplant (LTX) patients undergoing routine post-transplant follow-up. The key finding was that UHR-PCCT can be used to achieve either optimal image quality or reduced radiation dose while maintaining diagnostic image quality relative to prior HR-EIDCT, with performance assessed across the two dose settings (IQ100 vs IQ40). Clinically, this supports tailoring PCCT protocols for younger LTX populations who require frequent CT surveillance to balance spatial detail and cumulative radiation exposure.
Dubbeldam A, Van Ballaer V, Verschakelen J et al. · JHLT open · (2026) · View on PubMed ↗ · Free PDF ↗
Coronary CT Angiography (CCTA) with PCCT/PCCTA: Lumen, Stenosis, and Plaque
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), focusing on diagnostic value, clinical outcomes, and technical principles across literature from 2015 to March 2026. It concluded that CCTA increasingly supports noninvasive risk stratification and can reduce reliance on invasive angiography, while ICA remains important for specific clinical scenarios and limitations of CT (e.g., image quality and artifacts) are discussed. The review also highlights emerging photon-counting detector CT (PCD-CT) as a potential technical advance to improve coronary imaging performance.
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.
This prospective single-center study assessed deep learning–based automated coronary plaque quantification using ultra-high-resolution photon-counting detector CT (UHR PCD-CT) in 70 patients with suspected coronary artery disease (CAD). It tested how reconstruction spatial resolution (slice thicknesses of 0.6 mm standard resolution, 0.4 mm high resolution, and 0.2 mm ultra-high resolution) affects subjective image quality and the DL tool’s quantification of coronary stenosis and plaque volumes. The key significance is that it informs how to select spatial resolution settings to maximize both image quality and automated plaque measurement accuracy for coronary CT angiography.
Liu Y, Li R, Zhang H et al. · Academic radiology · (2026) · 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 evaluated photon-counting detector CT (PCD-CT) coronary CT angiography (CCTA) in the SCAPIS reexamination population, comparing diagnostic image quality and the comparability of Agatston scores and stenosis grading between PCD-CT and energy-integrating detector CT (EID-CT). Using CCTA data from 1,147 participants in SCAPIS reexamination (51% women, age 65 [IQR 61–69]), it reported improved or comparable image quality with PCD-CT and assessed whether quantitative measures align across detector types. The clinical significance is that it supports feasibility and standardization of PCCT-based CCTA in large population screening cohorts for coronary risk and stenosis assessment.
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 reviewed photon-counting detector CT (PCD-CT) for cardiac imaging, synthesizing technical principles and clinical evidence relevant to coronary CT angiography (CCTA). It highlights that PCD-CT’s direct energy discrimination, higher geometric dose efficiency, and ultrahigh spatial resolution can improve coronary lumen visualization and enable intrinsic spectral imaging, and it provides practical protocol considerations across applications including stents and heavily calcified plaque. The significance is that it offers actionable standards for implementing PCCT in cardiac workflows to improve diagnostic performance and protocol consistency.
Hagar MT, Vecsey-Nagy M, Kravchenko D et al. · European journal of radiology · (2026) · 2 citations · View on PubMed ↗
Pictorial review: a step-by-step guide to coronary CT angiography with photon-counting detector CT.
This pictorial review summarized the clinical workflow and protocol decision-making for photon-counting detector CT (PCD-CT) coronary CT angiography, focusing on how to select scanning parameters in practice. The key finding was that PCD-CT coronary CTA can improve image quality (including coronary plaque component differentiation) and reduce radiation dose compared with energy-integrating detector CT (EID-CT), but that standardized decision trees and parameter guidance are still emerging. This is significant because it translates photon-counting CT capabilities into actionable protocol choices for safer, higher-fidelity coronary imaging.
Xie C, Clarke N, Kotronias R et al. · The British journal of radiology · (2026) · View on PubMed ↗ · Free PDF ↗
The Accuracy of Photon-Counting CT Angiography of the Coronaries Compared to Invasive Coronary Angiography.
This retrospective single-center study evaluated the diagnostic accuracy of photon-counting coronary CT angiography (PCCT-CCTA) for coronary stenosis severity using invasive coronary angiography (ICA) as the reference standard in 90 adult patients. It found that PCCT-CCTA (performed in standard-resolution and ultra-high resolution) produced stenosis severity assessments and CAD-RADS 2.0 classifications that correlated with ICA findings, with radiologists rating image quality and stenosis grading in a blinded manner. These data support photon-counting CT angiography as a potentially more precise noninvasive alternative to ICA for grading coronary artery disease.
Haag NP, Katz MS, Wiemer M et al. · RoFo : Fortschritte auf dem Gebiete der Rontgenstrahlen und der Nuklearmedizin · (2026) · View on PubMed ↗ · Free PDF ↗
Coronary Plaque Vulnerability & Prognostic Imaging (Spectral/AI/Functional Integration)
Mixed coronary plaque phantom analysis by photon-counting CT: impact of calcium and iodine on low-attenuation plaque detection.
This phantom analysis compared photon-counting detector CT (PCD-CT) with energy-integrating detector CT (EID-CT) for detecting low-attenuation plaque (LAP) using mixed-plaque inserts embedded in a fat-equivalent ring, with full-rotation helical images as the high-resolution reference. PCD-CT improved LAP detectability—particularly for narrow, low-contrast LAP components—by leveraging virtual monoenergetic reconstructions and kernel/iterative reconstruction choices that enhanced contrast-to-noise for iodine-containing and low-attenuation regions. Improved LAP detection with PCD-CT could strengthen coronary plaque characterization and potentially refine risk assessment beyond what conventional CT can reliably detect.
Szilveszter B, Kolossváry M, Kubovje A et al. · European heart journal. Imaging methods and practice · (2026) · View on PubMed ↗ · Free PDF ↗
The Role of Computed Tomography in High-Risk Coronary Plaque: From Imaging Assessment to Prognostic Implications.
This review studied how computed tomography—especially coronary CT angiography (CCTA) and advanced CT techniques such as dual-energy CT and photon-counting CT—can characterize high-risk coronary plaque beyond luminal stenosis. It found that CCTA-derived vulnerable plaque features (e.g., low-attenuation plaque, positive remodeling, spotty calcifications, napkin-ring sign) and improved tissue characterization with spectral CT, combined with AI/radiomics and functional integration (FFR-CT and CT/MR perfusion), enhance prognostic stratification and enable longitudinal monitoring of plaque remodeling under therapy. These insights support CT-based plaque phenotyping as a pathway to earlier risk identification and treatment monitoring in coronary artery disease.
Pegoraro N, Muscogiuri G, Carnevale A et al. · Journal of clinical ultrasound : JCU · (2026) · View on PubMed ↗
Cerebrovascular & Carotid Stenosis Imaging with PCCT/PCCTA
Diagnostic Performance of Photon-Counting Detector CT Angiography in the Detection of Cerebral and Carotid Artery Stenosis.
This prospective cohort study evaluated ultra-high-resolution (UHR) photon-counting detector CT angiography (PCD-CTA) versus standard-resolution (SR) CTA in participants with suspected cerebral and carotid artery stenosis, using digital subtraction angiography (DSA) as the reference standard. UHR PCD-CTA showed improved diagnostic performance for detecting cerebral and carotid stenosis compared with SR-CTA (with DSA used to quantify accuracy). These findings support UHR photon-counting CT angiography as a more reliable noninvasive option for grading cerebrovascular and carotid stenosis, potentially improving triage for endovascular or surgical management.
Li Z, Jiang H, Zhang Y et al. · AJNR. American journal of neuroradiology · (2026) · View on PubMed ↗ · Free PDF ↗
Carotid Imaging: Current Concepts and Advanced Imaging.
This review article discussed current and advanced imaging concepts for carotid disease, highlighting how moving beyond luminal stenosis toward plaque biology requires multimodal characterization. The key finding was that advanced imaging modalities—including photon-counting CT (PCCT) alongside ultrasound, CTA, MRI, DSA, and PET—can provide complementary information on vulnerable plaque features such as intraplaque hemorrhage, lipid-rich necrotic core, fibrous cap status, ulceration, and perivascular inflammation. This is significant because it frames how PCCT may contribute to more accurate risk stratification for ischemic stroke beyond stenosis alone.
Saba L, Pinna A, Suri JS et al. · Seminars in neurology · (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 analyzed photon-counting CT angiography (PCCT) data from 20 asymptomatic patients to characterize carotid perivascular adipose tissue (PVAT) using a layer-by-layer quantitative approach. The key finding was that PCCT enables spatially resolved PVAT characterization and allows assessment of PVAT variability across concentric layers in an asymptomatic cohort. Scientifically, this supports PVAT quantification as a potential imaging biomarker of carotid vulnerability and provides a methodological foundation for larger studies.
Saba L, Alkadhi H, Maffei E et al. · European radiology · (2026) · 1 citations · View on PubMed ↗ · Free PDF ↗
Neurovascular Interventions Follow-up (Stents/Flow Diverters/ISR)
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. The key finding was that UHR PCD-CTA was investigated as an improved approach to overcome conventional CTA’s blooming artifacts and limited spatial resolution, enabling more accurate ISR detection (with results reported in the full text). Clinically, if performance is superior, UHR PCD-CTA could reduce the need for invasive follow-up and improve surveillance of neurovascular stents.
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 evaluated ultra-high-resolution photon-counting CT angiography (UHR-PCCTA) versus standard-resolution PCCTA and digital subtraction angiography (DSA) for follow-up assessment after flow diverter (FD) treatment in 47 participants. UHR-PCCTA provided more comprehensive post-FD evaluation of aneurysm size and treatment-related endpoints (including occlusion status and neck coverage) compared with standard-resolution PCCTA, while aiming to reduce reliance on invasive DSA. Scientifically and clinically, the results suggest that photon-counting detector CT angiography can improve visualization of post-treatment vascular anatomy and potentially streamline follow-up after FD therapy.
Li R, He N, Cui Y et al. · European journal of radiology · (2026) · View on PubMed ↗
Cardiac Imaging Beyond Coronary (e.g., LAA thrombus)
Cardiac photon-counting detector computed tomography in acute ischemic stroke: diagnostic accuracy for detection of left atrial appendage thrombus.
This retrospective diagnostic accuracy study evaluated cardiac photon-counting detector CT (PCD-CT) integrated into an acute stroke imaging protocol for detecting left atrial appendage (LAA) thrombus in consecutive patients with acute ischemic stroke or transient ischemic attack. The key finding was that cardiac PCD-CT demonstrated clinically useful diagnostic performance for LAA thrombus detection when compared against the reference standard of transesophageal echocardiography (TEE). The results suggest that PCD-CT could improve etiologic workup for embolic stroke by enabling more reliable LAA assessment in the acute setting.
Kirschfink A, Elhalal M, Seidel S et al. · Therapeutic advances in neurological disorders · (2026) · View on PubMed ↗ · Free PDF ↗
Peripheral Vascular Imaging (PAD/Bypass/Runoff) with PCCTA
Photon-counting detector computed tomography angiogram more accurately characterizes lower extremity runoff than traditional computed tomograph angiogram.
In a single-center retrospective cohort study, the authors compared lower extremity photon-counting detector CT angiography (PCD-CTA; n=43) with conventional energy-integrating detector CT angiography (EID-CTA; n=46) against on-table angiography to determine which tibial artery (TA) was identified for potential bypass. PCD-CTA more accurately characterized the target TA than EID-CTA, with fewer discrepancies versus angiography (4.6% vs 21.7%; P=.03). More accurate runoff mapping with PCD-CTA could improve planning and outcomes for lower extremity bypass by reducing misidentification of the target vessel.
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 studied photon-counting computed tomography angiography (PCCTA) for patients with peripheral artery disease (PAD), focusing on how PCCTA technical principles address limitations of conventional energy-integrating detector CTA (EID-CTA) such as calcium blooming and beam hardening. The review reports that current evidence suggests PCCTA can improve image quality and diagnostic performance in small, heavily calcified peripheral vessels, with potential downstream benefits for diagnosis, procedural planning, and postintervention surveillance. These findings are clinically significant because more accurate noninvasive vascular imaging could reduce uncertainty in PAD management and improve monitoring of interventions in calcified disease.
Zivkovic M, Raskin D, Ghibes P et al. · Journal of vascular surgery cases and innovative techniques · (2026) · View on PubMed ↗ · Free PDF ↗
Musculoskeletal & Orthopedic Imaging (Bone/Implants/Trauma)
Musculoskeletal Computed Tomography Imaging: A 30-Year Perspective.
This 30-year perspective reviewed the evolution of computed tomography (CT) techniques for musculoskeletal imaging in humans, including advances from helical CT to high-resolution, dose-efficient systems and newer spectral and weight-bearing cone-beam approaches. It highlights that spectral CT can characterize crystal deposits and marrow edema while reducing metal artifacts, and that weight-bearing cone-beam CT can assess joint alignment. The scientific significance is that these technological advances expand CT beyond static fracture/bone assessment toward more functional and tissue-specific evaluation with improved diagnostic utility.
Omoumi P, Pastor M, Demehri S et al. · Seminars in musculoskeletal radiology · (2026) · View on PubMed ↗
Photon-Counting Detector CT-Based Virtual Monoenergetic Imaging With Metal Artifact Reduction for Endodontic Diagnostics.
In an ex vivo study of 16 extracted third molars, photon-counting detector CT (PCD-CT) was used to determine the optimal virtual monoenergetic imaging (VMI) energy (70–190 keV) and to test iterative metal artifact reduction (iMAR) for simulated endodontic diagnostic challenges at radiation doses equivalent to standard-dose cone-beam CT. The key finding was that VMI energy selection and iMAR meaningfully affected diagnostic accuracy and artifact severity, improving depiction of endodontic complications under simulated conditions. This is clinically relevant because it supports optimizing PCD-CT reconstruction settings to enhance endodontic diagnostics while controlling radiation exposure.
Al-Haj Husain A, Dogan S, Mergen V et al. · International dental journal · (2026) · 1 citations · View on PubMed ↗ · Free PDF ↗
Dual-energy CT for detection of knee fractures as alternative to MRI.
This narrative review studied the evidence and clinical applications of dual-energy CT (DECT) for acute knee trauma as an alternative to MRI, focusing on techniques such as virtual non-calcium imaging for bone marrow edema and spectral analysis. The review found that DECT can detect and characterize a range of knee fracture patterns (including subtle impacted fractures, stress fractures, and complex articular injuries) and can reduce metal artifacts while providing soft-tissue assessment, with performance varying by clinical scenario. Clinically, DECT may help triage and diagnose acute knee fractures when MRI is unavailable or delayed, potentially improving workflow and patient access to imaging.
Foti G, Tripodi G, Ocello G et al. · Skeletal radiology · (2026) · 1 citations · View on PubMed ↗
Precision of photon-counting detector CT compared to conventional CT for total wrist arthroplasty migration: a cadaveric and clinical study.
This cadaveric-and-clinical study compared photon-counting detector CT (PCD-CT) with conventional energy-integrating detector CT (EID-CT) for measuring total wrist arthroplasty (TWA) implant migration, using bead-free CT radiostereometric analysis (CT-RSA) as the measurement framework. The key finding was that PCD-CT achieved precision comparable to or better than EID-CT across different radiation doses for quantifying implant migration, indicating improved measurement reliability. This is significant for post-operative surveillance of implant loosening, where more precise migration detection can enable earlier identification of failure risk.
Lind G, Tesselaar E, Sandberg O et al. · Skeletal radiology · (2026) · View on PubMed ↗ · Free PDF ↗
Bone Microarchitecture & Trabecular/Marrow Characterization (DECT/PCCT/MRI)
“Trabecular Architecture of the Medullary Cavity: A Comprehensive Review of Radiological Patterns, Pathological Alterations”.
This narrative review studied radiological patterns of trabecular architecture in the medullary cavity and how pathological alterations (e.g., thickening, breakage, rarefaction, infiltration) appear across imaging modalities. It found that high-resolution MRI, dual-energy CT, and emerging photon-counting detector CT can differentially characterize trabecular changes, with diagnostic precision depending on the modality’s ability to resolve microarchitecture and tissue composition. Scientifically, consolidating these radiological signatures and indices (including the Singh Index) supports more standardized, imaging-based assessment of bone microstructural disease.
Chapala S, Kiyawat V, Gibson J et al. · The British journal of radiology · (2026) · View on PubMed ↗ · Free PDF ↗
ENT/Temporal Bone & Cochlear Implant Visualization with PCCT
Multireader Comparison of Photon-Counting Detector CT Reconstructions for Evaluation of Temporal Bone Cochlear Implants.
This multireader study assessed six different photon-counting CT (PCCT) reconstruction approaches for imaging temporal bone cochlear implants in 20 patients (24 implants) scanned on a NAEOTOM Alpha photon-counting CT system. Across readers, reconstruction choice significantly affected image quality metrics relevant to cochlear implant visualization, with certain algorithms providing more favorable depiction than others. Optimizing PCCT reconstruction parameters for cochlear implant imaging could improve postoperative assessment and reduce uncertainty in temporal bone diagnostics.
Dogra S, O’Donnell T, Nayak G et al. · AJNR. American journal of neuroradiology · (2026) · 1 citations · View on PubMed ↗
Oncology Imaging with PCCT (GI malignancies & polyp detection)
Photon-counting CT in gastrointestinal malignancies: a scoping review.
This scoping review mapped and synthesized clinical evidence for photon-counting computed tomography (PCCT) in adult gastrointestinal (GI) malignancies using PRISMA-ScR methods across studies published from January 2017 to December 2025. The key finding is a structured overview of where PCCT has been studied in GI oncology and how its reported advantages (e.g., improved contrast-to-noise ratio, spatial resolution, and potential dose reduction) translate into clinical imaging tasks. The scientific significance is that it identifies evidence gaps and prioritizes future research directions for adopting PCCT in GI cancer imaging.
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.
Using a phantom containing 84 histopathologically confirmed colorectal polyps, this study compared photon-counting detector CT (PCD-CT) with energy-integrating detector CT (EID-CT) for polyp detection across size categories (≤5 mm, 6–9 mm, ≥10 mm). The key finding was that PCD-CT demonstrated diagnostic performance differences versus EID-CT in terms of image quality metrics (SNR/CNR), radiologist detection sensitivity, and diagnostic confidence, with performance evaluated against histopathology as the reference standard. This is significant because it provides controlled evidence that photon-counting CT may improve colorectal polyp detection, especially for clinically relevant small lesions.
Wu X, Gao H, Gao Y et al. · Abdominal radiology (New York) · (2026) · View on PubMed ↗
Critical Care & Emergency Imaging Workflows (ARDS/Stroke/NCCT/PE)
Photon Counting CT of the Head: Retrospective Analysis of Image Quality and Dose in Comparison to Energy Integrating Detector CT.
This retrospective analysis compared non-contrast head CT (NCCT) image quality and radiation dose between photon-counting detector CT (PCD-CT) and energy-integrating detector CT (EID-CT) in patients scanned at 120 and 140 kVp with varying radiation doses. The study found systematic differences in image quality metrics and dose outcomes across acquisition parameters when using PCD-CT versus EID-CT (details are provided in the truncated results). The significance is that it supports evidence-based protocol optimization for emergency NCCT by potentially lowering dose while maintaining or improving diagnostic image quality.
Schoenbeck D, Kroeger JR, Moenninghoff C et al. · Academic radiology · (2026) · View on PubMed ↗ · Free PDF ↗
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.
This retrospective observational study intraindividually compared photon-counting detector CT (PCD-CT) versus energy-integrating detector CT (EID-CT) for contrast-enhanced chest imaging in patients with acute respiratory distress syndrome (ARDS). The key finding was that PCD-CT was evaluated for potential improvements in image quality and/or radiation exposure relative to EID-CT in critically ill ARDS patients undergoing both scan types. Scientifically and clinically, results could guide dose- and quality-optimized CT strategies in a high-risk population where minimizing radiation while preserving diagnostic detail is essential.
Rosok D, Opitz M, Bos 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) and photon-counting CT (PCCT) techniques in critical care, emphasizing how spectral reconstructions (e.g., iodine maps and virtual non-contrast images) can reduce contrast dose and radiation while improving diagnostic performance. The key finding was that spectral CT approaches—particularly DECT-derived iodine perfusion mapping in pulmonary embolism—can provide both anatomical and functional assessment that may improve detection and reduce contrast exposure in critically ill patients. Scientifically, it consolidates current applications and supports broader adoption of spectral CT strategies to enable faster, safer imaging in high-acuity settings.
Freed A, Bogot NR, Einav S · Journal of critical care · (2026) · View on PubMed ↗
Generated automatically on August 04, 2026. Covers PubMed articles published July 28, 2026 – August 04, 2026. Summaries are AI-generated; always consult the original publication for clinical or research decisions.