What’s New in Photon Counting CT?

August 05, 2026 · 38 articles · 15 research themes · covering July 29, 2026 – August 05, 2026

Overview

Across this week’s set of studies, photon-counting CT (PCD-CT/PCCT) is repeatedly shown to deliver more diagnostic information than energy-integrating CT (EID-CT), particularly where conventional imaging struggles with small structures and high attenuation (e.g., calcification blooming, beam hardening, and limited spatial resolution). The dominant experimental and clinical signals come from coronary and vascular applications (stenosis quantification, low-attenuation plaque detection, and improved target-vessel identification for bypass planning), as well as from broader organ imaging where image quality gains translate into more consistent visualization across contrast phases (e.g., pancreas) and in high-stakes workflows (e.g., acute stroke embolic-source evaluation with left atrial appendage thrombus detection).

A second major theme is “spectral practicality”: multiple papers focus on how to make PCD-CT’s physics usable at the protocol level—through contrast/dose strategies (including iodine dose reduction rules and high-Z or hybrid contrast agents), reconstruction optimization (kernel sharpness and iterative reconstruction settings), and material/energy methods (virtual monoenergetic imaging, K-edge feasibility, and threshold selection guided by approximate Cramér–Rao bounds). These efforts collectively aim to preserve or improve contrast-to-noise while controlling radiation exposure, including in pediatric and high-risk cohorts (e.g., ARDS, lung transplant surveillance), and to standardize implementation via guidance and decision-tree style clinical workflows.

Finally, the evidence landscape is expanding beyond “better images” toward “better biomarkers and risk stratification.” Reviews and imaging studies emphasize moving from lumen-only assessment to plaque vulnerability and prognostic phenotyping (coronary vulnerable features; carotid biology beyond stenosis), and they explore quantitative tissue metrics derived from PCD-CT (e.g., extracellular volume for liver fibrosis staging, and perivascular adipose tissue layer quantification in carotid disease). Together, these papers suggest that the next step for PCD-CT is not only improved detection, but also robust, reproducible quantitative endpoints that can support longitudinal monitoring and clinical decision-making.

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Photon-counting CT physics, detector operation, and reconstruction theory

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 across increasing patient size using 3D-printed pancreas and tissue-mimicking phantoms at waist-equivalent extension rings (50th, 75th, 85th, 95th percentiles) scanned at CTDIvol 0.5–19.4 mGy. The results showed how PCCT noise performance and dose efficiency change with obesity-representative phantom size relative to EID-CT. These data are significant for optimizing low-dose imaging protocols in larger patients, where PCCT’s spectral/counting advantages may translate into improved image quality at lower dose.

Liu LP, Mei K, Sharma S et al. · Journal of applied clinical medical physics · (2026) · View on PubMed ↗ · Free PDF ↗

A physics primer on photon-counting detectors in CT: Physics, signal formation, and performance.

This physics-focused primer reviewed photon-counting detector CT (PCD-CT) by describing detector operation, signal formation, and performance as x-ray interactions generate charge that is processed into threshold-bin decisions rather than a direct energy readout. The key message was that understanding the full detector-readout chain is essential to interpret spectral distortion, count loss, and instability under clinical operating conditions. Scientifically, this framework helps clinicians and researchers correctly evaluate PCCT image/spectral behavior and improves translation from engineering performance to diagnostic imaging interpretation.

Chen GH, Lai R, Li K · Medical physics · (2026) · View on PubMed ↗ · Free PDF ↗

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Contrast media, spectral agents, and dose optimization for PCD-CT

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 parenchymal CT and CT angiography contrast-to-noise ratio (CNR). Using a first-generation dual-source PCD-CT with spectral abdominal and chest phantoms containing iodine-in-water rods (0.5–15 mg I/mL) and ICRU muscle, the authors found that CM dose can be reduced according to the rule-of-thumb without substantially compromising CNR. The result provides a simple, implementable dosing strategy to reduce iodine exposure in PCD-CT protocols while preserving diagnostic contrast.

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 BAY3685750, a novel iodine–gadolinium hybrid contrast medium, for photon-counting detector CT (PCD-CT) performance in an anthropomorphic abdominal phantom. Compared with conventional iodine-based and gadolinium-based agents, BAY3685750 produced improved spectral/virtual monoenergetic image contrast at higher energies where iodine’s low k-edge limits performance. The work suggests that high-k-edge hybrid agents could enhance high-energy VMI contrast in PCD-CT, potentially improving lesion conspicuity in clinical imaging.

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 assessed whether high-Z (higher atomic number than iodine) contrast media improve coronary photon-counting detector CT angiography quantification by preserving vascular contrast at high VMI energies. Using a phantom with small-diameter vessel-mimicking rods (4 and 6 mm) and calcification-mimicking materials, the authors found that high-Z contrast better maintained lumen contrast at high-energy VMIs, reducing calcification-related blooming and improving stenosis quantification accuracy. These results support high-Z contrast media as a strategy to improve the reliability of coronary stenosis assessment on PCD-CT, particularly in heavily calcified disease.

Demmert TT, Klambauer K, Schmidt B et al. · Investigative radiology · (2026) · View on PubMed ↗ · Free PDF ↗

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Material decomposition, energy-threshold/K-edge imaging, and virtual monoenergetic imaging

K-Edge imaging using a clinical dual-source photon-counting CT system.

This phantom feasibility study used a clinical dual-source photon-counting CT system with four energy thresholds (20, 55, 72, and 90 keV) to test K-edge imaging for iodine (I) and gadolinium (Gd) using multi-energy-bin material decomposition. The key finding was that K-edge imaging of I and Gd on a clinically available PCCT platform is feasible and its performance can be characterized under practical threshold-bin settings. Clinically, this supports dual-contrast/dual-material imaging strategies that may reduce radiation dose and motion artifacts by enabling more information from fewer scans.

Rybertt MV, Liu LP, Sahbaee P et al. · Journal of applied clinical medical physics · (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) analyses to select semi-optimal energy thresholds in photon-counting CT without requiring complete system models. The key finding was that practical linear and nonlinear approximate CRLB approaches can be implemented using look-up tables derived from threshold-scan measurements on reference slab phantoms. This is significant because it provides a feasible route to improve noise performance in PCCT material decomposition by guiding threshold selection in real systems.

Lee O · Medical physics · (2026) · View on PubMed ↗ · Free PDF ↗

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Coronary CT angiography (CCTA) with PCD-CT: lumen, stenosis, and plaque characterization

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) against energy-integrating detector CT (EID-CT) for detecting low-attenuation plaque (LAP) by imaging a mixed-plaque phantom with iodinated lumen and calcified arcs, using full-rotation helical images as a high-resolution reference. PCD-CT improved LAP detection performance relative to EID-CT, and the analysis specifically examined how calcium and iodine content influenced detectability of low-attenuation plaque strips. These results support the use of PCCT for more sensitive coronary plaque characterization, potentially improving risk assessment beyond conventional CT approaches.

Szilveszter B, Kolossváry M, Kubovje A et al. · European heart journal. Imaging methods and practice · (2026) · View on PubMed ↗ · Free PDF ↗

Deep Learning-Based Automated Coronary Plaque Quantification with Ultra-high Resolution Photon-Counting Detector CT at Different Spatial Resolutions.

This prospective single-center study evaluated how different spatial resolutions affect image quality and deep learning (DL)-based quantification of coronary stenosis and plaque volumes using ultra-high-resolution photon-counting detector CT (UHR PCD-CT) in 70 patients with suspected coronary artery disease. Coronary datasets were reconstructed at slice thicknesses of 0.6 mm (standard resolution), 0.4 mm (high resolution), and 0.2 mm (ultra-high resolution), with two radiologists scoring subjective image quality and a DL tool automatically quantifying stenosis and plaque volumes. Demonstrating robust DL quantification across spatial resolutions could improve the practicality of PCD-CT coronary plaque assessment while optimizing reconstruction settings for diagnostic accuracy.

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 used the population-based SCAPIS reexamination cohort (15,000 participants; analysis included 1,147 participants) to describe a photon-counting detector CT (PCD-CT) coronary CT angiography (CCTA) protocol and compare diagnostic image quality with energy-integrating detector CT (EID-CT) from SCAPIS baseline. It assessed comparability of Agatston coronary artery calcium scores and degree of stenosis between the PCD-CT and EID-CT studies. Improved or comparable coronary imaging performance with PCD-CT in a large screening population could support broader adoption of spectral photon-counting CCTA protocols.

Lidén M, Nyberg G, Aurumskjöld ML et al. · European journal of radiology · (2026) · View on PubMed ↗ · Free PDF ↗

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Coronary plaque vulnerability and risk stratification using spectral/PCD-CT

The Role of Computed Tomography in High-Risk Coronary Plaque: From Imaging Assessment to Prognostic Implications.

This narrative review discussed how computed tomography—especially coronary CT angiography (CCTA) and advanced spectral CT including dual-energy CT and photon-counting detector CT—moves from luminal stenosis assessment toward high-risk plaque characterization and prognostic implications. It reports that CT can identify vulnerable plaque features (e.g., low-attenuation plaque, positive remodeling, spotty calcifications, napkin-ring sign) and that integration with functional tests such as FFR-CT and perfusion imaging links plaque vulnerability to ischemia risk. The synthesis supports CT-based plaque phenotyping as a pathway to risk stratification and monitoring of therapeutic plaque stabilization over time.

Pegoraro N, Muscogiuri G, Carnevale A et al. · Journal of clinical ultrasound : JCU · (2026) · View on PubMed ↗

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Cardiac PCD-CT applications beyond coronary (e.g., LAA thrombus, stents, congenital heart disease)

Optimizing Photon-counting CT for Congenital Heart Disease: The Value of Ultrasharp Kernels in Neonates and Infants.

This retrospective study optimized photon-counting detector CT (PCD-CT) reconstruction for congenital heart disease in neonates and infants by varying kernel sharpness (vascular kernels with sharpness levels 36–60) and iterative reconstruction (IR) settings (Q1–Q4) in high-pitch acquisitions. The key finding was that ultrasharp kernel sharpness and specific IR levels meaningfully affected visual image quality scores in pediatric cardiac imaging. Establishing these reconstruction settings is clinically important for achieving diagnostic image quality in small patients while leveraging PCCT’s high spatial resolution and dose-efficient performance.

Salam B, Sprinkart AM, Hart C et al. · Radiology. Cardiothoracic imaging · (2026) · View on PubMed ↗

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 who underwent emergent PCD-CT and transesophageal echocardiography (TEE). The study found that cardiac PCD-CT demonstrated clinically useful diagnostic performance for LAA thrombus detection when compared with the TEE reference standard. These results suggest that cardiac PCD-CT could improve and expedite embolic source evaluation in acute stroke workflows by offering a noninvasive alternative to TEE.

Kirschfink A, Elhalal M, Seidel S et al. · Therapeutic advances in neurological disorders · (2026) · View on PubMed ↗ · Free PDF ↗

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Peripheral vascular imaging with PCD-CT angiography (PAD, runoff, bypass planning)

Photon-counting detector computed tomography angiogram more accurately characterizes lower extremity runoff than traditional computed tomograph angiogram.

This single-center retrospective cohort study compared photon-counting detector CT angiography (PCD-CT; n=43) with conventional energy-integrating detector CT angiography (EID-CTA; n=46) against on-table angiography to identify the target tibial artery for potential lower-extremity bypass in patients with lower-extremity runoff. PCD-CT more accurately matched the angiographic target tibial artery than EID-CTA, with discordant tibial artery identification occurring in 2/43 (4.6%) versus 10/46 (21.7%; P=.03). More accurate tibial artery characterization with PCD-CT could improve procedural planning and reduce downstream errors in peripheral revascularization strategies.

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 synthesized technical principles and current evidence on photon-counting computed tomography angiography (PCCTA) for patients with peripheral artery disease (PAD), focusing on limitations of conventional CTA such as calcium blooming and beam hardening in small, heavily calcified vessels. The review concludes that PCCTA has the potential to overcome these issues and improve image quality and diagnostic performance for PAD imaging and surveillance. Clinically, these advances could translate into better diagnostic accuracy and more reliable procedural planning and follow-up in PAD patients with calcified disease.

Zivkovic M, Raskin D, Ghibes P et al. · Journal of vascular surgery cases and innovative techniques · (2026) · View on PubMed ↗ · Free PDF ↗

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Cerebrovascular imaging with UHR PCD-CTA/PCD-CT (stenosis, flow diversion follow-up)

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 (UHR) photon-counting detector (PCD) CT angiography (CTA) with 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 demonstrated diagnostic performance for detecting cerebral and carotid stenosis that was compared directly against SR-CTA reconstructions generated from the same raw data. These findings support whether UHR photon-counting CTA can improve stenosis detection accuracy relative to conventional photon-counting CTA reconstructions, informing clinical adoption for cerebrovascular disease evaluation.

Li Z, Jiang H, Zhang Y et al. · AJNR. American journal of neuroradiology · (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 assessed photon-counting CT angiography (PCCTA) for follow-up after flow-diverter (FD) treatment by comparing ultra-high-resolution (UHR) versus standard-resolution (SR) PCCTA against digital subtraction angiography (DSA) in 47 consecutively treated participants. The key finding was that UHR-PCCTA provided comprehensive post-FD evaluation (e.g., aneurysm size and occlusion/neck coverage) with improved visualization and artifact reduction compared with SR-PCCTA, while DSA served as the reference comparator. This is significant because it suggests a less invasive, higher-resolution imaging pathway for monitoring FD-treated intracranial aneurysms, potentially reducing reliance on invasive DSA.

Li R, He N, Cui Y et al. · European journal of radiology · (2026) · View on PubMed ↗

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Neurovascular stents and in-stent restenosis (ISR) surveillance with PCD-CTA

Ultra-High-Resolution Photon-Counting CT Angiography for Noninvasive Detection of Neurovascular In-Stent Restenosis.

This prospective study enrolled consecutive patients with neurovascular stents to test whether ultra-high-resolution photon-counting detector CTA (UHR PCD-CTA) can noninvasively detect neurovascular in-stent restenosis (ISR) more accurately than conventional CTA approaches. Using UHR PCD-CTA, the study aimed to address ISR detection challenges driven by blooming artifacts and limited spatial resolution on energy-integrating detector CTA. If confirmed, UHR PCD-CTA could enable more reliable noninvasive ISR surveillance, potentially reducing the need for invasive angiography in stented patients.

Su CQ, Zhou C, Wu PF et al. · Stroke · (2026) · View on PubMed ↗ · Free PDF ↗

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Pulmonary imaging with PCD-CT (perfusion mapping, ARDS, lung transplant)

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 performed intraindividual comparisons in ARDS patients who underwent both contrast-enhanced photon-counting detector CT (PCD-CT) and energy-integrating detector CT (EID-CT) between April 2023 and May 2025. It evaluated differences in image quality and radiation exposure, including CT dose index volume (CTDIvol), between the two detector technologies. If PCD-CT improves image quality while reducing dose in critically ill ARDS patients, it could inform safer imaging strategies in this high-risk population.

Rosok D, Opitz M, Bos D et al. · Emergency 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 prospective comparative study evaluated ultra-high-resolution photon-counting CT (UHR-PCCT; 0.4 mm) versus high-resolution energy-integrating detector CT (HR-EIDCT; 1.0 mm) in 100 lung-transplant recipients, using two PCCT dose/image-quality targets (IQ100 and reduced IQ40) compared with prior scans. The key finding was that UHR-PCCT can preserve or improve lung imaging quality after transplantation while allowing reduced radiation dose (IQ40) relative to the prior HR-EIDCT reference, with trade-offs quantified by reader comparisons. Scientifically and clinically, the results support using UHR-PCCT for longitudinal lung-transplant surveillance to balance high spatial detail with lower cumulative radiation burden.

Dubbeldam A, Van Ballaer V, Verschakelen J et al. · JHLT open · (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) and dual-energy CT (DECT) pulmonary angiography perfusion mapping against ventilation–perfusion (V/Q) SPECT/CT as the reference standard across two independent patient cohorts. The key finding was that PCD-CT perfusion mapping showed diagnostic performance metrics (sensitivity/specificity and iodine density quantification) comparable to or differing from DECT depending on clinical indication, with quantitative iodine density reference values derived for lobar perfusion assessment. This is significant because it positions PCD-CT as a potential alternative to DECT for functional pulmonary perfusion evaluation when V/Q SPECT/CT is used for validation.

Ogbonna A, Chamberlin JH, Baruah D et al. · Emergency radiology · (2026) · View on PubMed ↗ · Free PDF ↗

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Oncology GI imaging with PCD-CT (including colorectal polyps and GI malignancies)

Photon-counting CT in gastrointestinal malignancies: a scoping review.

This scoping review mapped and synthesized clinical evidence (2017–2025) on photon-counting CT (PCCT) applications in adult gastrointestinal malignancies, using PRISMA-ScR methods and quality grading (Newcastle–Ottawa Scale; Oxford Centre for Evidence levels). Overall, the review found that PCCT studies consistently report improved spatial resolution and contrast-to-noise ratio with potential radiation dose reduction compared with conventional CT across GI oncology workflows. Clinically, this provides a structured evidence landscape to guide where PCCT may offer the most value in GI cancer imaging and highlights gaps needing higher-quality comparative trials.

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) versus energy-integrating detector CT (EID-CT) for colorectal polyp detection using 84 histopathologically confirmed polyps from resected specimens, stratified by size (≤5 mm, 6–9 mm, ≥10 mm). PCD-CT showed improved image quality metrics and detection performance (including higher signal-to-noise/contrast-to-noise and diagnostic confidence) relative to EID-CT across polyp sizes, with the largest gains expected for smaller lesions. These findings support PCD-CT as a more sensitive CT approach for colorectal screening/diagnosis, potentially improving detection of clinically important small polyps.

Wu X, Gao H, Gao Y et al. · Abdominal radiology (New York) · (2026) · View on PubMed ↗

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Liver fibrosis and quantitative functional imaging with PCD-CT

Photon-counting CT Extracellular Volume Fraction for Liver Fibrosis Assessment: Validation against MR Elastography and Histopathology.

This prospective validation study assessed whether photon-counting CT (PCCT)–derived extracellular volume fraction (ECV) can stage liver fibrosis by correlating with MR elastography–derived liver stiffness measurement (LSM) and comparing diagnostic performance against histopathology in 157 participants with suspected hepatic malignancies. PCCT ECV showed feasibility for fibrosis assessment with diagnostic agreement/correlation evaluated directly against MR elastography and histopathologic staging. If validated, PCCT ECV could provide a noninvasive CT-based alternative for liver fibrosis quantification that aligns with established MR elastography and pathology benchmarks.

Wu X, Li J, Deng R et al. · Radiology · (2026) · View on PubMed ↗

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Musculoskeletal imaging and fracture assessment using spectral/PCD-CT

Musculoskeletal Computed Tomography Imaging: A 30-Year Perspective.

This 30-year perspective article reviewed how computed tomography (CT) has evolved for musculoskeletal imaging, including advances from helical CT to dose-efficient high-resolution systems and newer spectral CT methods. It highlights that spectral CT can characterize crystal deposits and marrow edema and reduce metal artifacts, while other innovations such as weight-bearing cone-beam CT and CT arthrography expand functional and intra-articular assessment. These developments reinforce CT’s ongoing role in fracture evaluation and pre-/postoperative musculoskeletal care, with emerging techniques improving tissue characterization and artifact 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 evaluated evidence for dual-energy CT (DECT) as an alternative to MRI for acute knee fracture detection, focusing on virtual non-calcium reconstructions and spectral analysis. The review highlights that DECT can detect clinically relevant fracture patterns (including subtle and complex injuries) and may offer advantages such as metal artifact reduction and additional soft-tissue assessment compared with conventional CT. Clinically, DECT could broaden access to rapid, MRI-like fracture evaluation in settings where MRI is delayed or contraindicated.

Foti G, Tripodi G, Ocello G et al. · Skeletal radiology · (2026) · 1 citations · View on PubMed ↗

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Other anatomical/clinical applications (temporal bone/implants, endodontics, cochlear implants, trabecular bone, PVAT)

Multireader Comparison of Photon-Counting Detector CT Reconstructions for Evaluation of Temporal Bone Cochlear Implants.

This multireader study evaluated six photon-counting CT (PCCT) reconstruction approaches for temporal bone imaging of cochlear implants (CIs) in 20 patients (24 implants) scanned on a NAEOTOM Alpha photon-counting CT system. Across readers, reconstruction algorithm choice affected image quality/diagnostic performance for CI visualization, with the study identifying differences among head-regular sharpness settings (e.g., Hr84 0.2-mm polyenergetic T3D) and other reconstruction parameters. Optimizing PCCT reconstruction for cochlear implant imaging could improve clinical confidence in temporal bone assessment while leveraging PCCT’s improved spatial resolution and contrast-to-noise characteristics.

Dogra S, O’Donnell T, Nayak G et al. · AJNR. American journal of neuroradiology · (2026) · 1 citations · View on PubMed ↗

Improved pancreatic imaging with photon-counting CT: a retrospective comparison with conventional CT.

This retrospective comparison evaluated image quality for pancreatic imaging in 35 patients who underwent both photon-counting CT (PCCT) and conventional energy-integrating detector CT (EIDCT) across multiple contrast phases. Across 11 peripancreatic regions, PCCT improved image quality ratings and quantitative measures of density and noise compared with EIDCT. Improved pancreatic visualization with PCCT may enhance detection and characterization of pancreatic disease while supporting more consistent image quality across contrast phases.

Brandt EGS, Christoph Müller F, Nielsen YJ et al. · Acta radiologica (Stockholm, Sweden : 1987) · (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 study compared energy-integrating detector CT (EICT) and photon-counting detector CT (PCCT) for pediatric chest imaging in a one-year-old anthropomorphic phantom using 70 kV and 100Sn (tin-filtered 100 kV) protocols, assessing dose with thermoluminescent dosimeters (TLDs) and image quality using clinical/phantom metrics. The key finding was that PCCT enabled dose reduction while maintaining image quality at matched protocol targets, with performance differences evaluated across the 70 kV and 100Sn tin-filtered settings. These results support protocol optimization for pediatric thoracic CT by leveraging PCCT detector physics to reduce radiation exposure without sacrificing diagnostic image quality.

Kunert P, Weis M, Schlattl H et al. · European journal of radiology · (2026) · View on PubMed ↗ · Free PDF ↗

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 with simulated endodontic diagnostic challenges, photon-counting detector CT (PCD-CT) was used to determine optimal virtual monoenergetic imaging (VMI) energy levels (70–190 keV in 10 keV steps) and to test iterative metal artifact reduction (iMAR) for assessing complications at radiation doses equivalent to standard-dose cone-beam CT. The key finding was that VMI energy selection and iMAR materially affected diagnostic depiction quality and artifact severity, improving visualization of endodontic structures under metal-related conditions. Clinically, this supports optimizing PCD-CT VMI/iMAR settings to enhance endodontic diagnostics while keeping patient dose comparable to conventional CBCT.

Al-Haj Husain A, Dogan S, Mergen V et al. · International dental journal · (2026) · 1 citations · View on PubMed ↗ · Free PDF ↗

Carotid Imaging: Current Concepts and Advanced Imaging.

This review article discussed carotid imaging concepts and advanced imaging approaches, 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. The key finding was that multimodal plaque phenotyping using ultrasound, CTA, MRI, DSA, photon-counting CT (PCCT), and PET provides complementary information relevant to stroke risk stratification. Scientifically and clinically, it supports moving beyond lumen-based assessment toward imaging biomarkers that better predict which carotid plaques are likely to cause ischemic events.

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 analysis used photon-counting CT (PCCT) angiography data from 20 asymptomatic patients to characterize carotid perivascular adipose tissue (PVAT) with a custom Python algorithm performing layer-by-layer quantitative analysis. The key finding was that carotid PVAT can be spatially quantified in concentric layers and shows measurable variability in an asymptomatic cohort, enabling structured assessment beyond qualitative imaging. This is significant because it lays groundwork for using PCCT-derived PVAT metrics as potential biomarkers of vascular inflammation and plaque vulnerability in future longitudinal studies.

Saba L, Alkadhi H, Maffei E et al. · European radiology · (2026) · 1 citations · View on PubMed ↗ · Free PDF ↗

“Trabecular Architecture of the Medullary Cavity: A Comprehensive Review of Radiological Patterns, Pathological Alterations”.

This narrative review summarized radiological patterns of trabecular architecture in the medullary cavity and how they change in pathology, emphasizing imaging modalities including high-resolution MRI, dual-energy CT, and emerging photon-counting detector CT. It describes characteristic radiological alterations such as thickening, breakage, faintness, rarefaction, and infiltration and discusses how indices like the Singh Index relate to imaging appearance. The review supports the growing role of advanced CT techniques (including PCD-CT) for more detailed, potentially earlier assessment of trabecular bone pathology.

Chapala S, Kiyawat V, Gibson J et al. · The British journal of radiology · (2026) · View on PubMed ↗ · Free PDF ↗

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Methodology and evidence synthesis (reviews/guidance/comparative pathways)

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 invasive coronary angiography (ICA), including diagnostic value, clinical outcomes, and technical principles, and specifically discussed emerging photon-counting detector CT (PCD-CT) concepts. The key conclusion was that CCTA increasingly supports noninvasive risk stratification while ICA remains important in selected clinical scenarios, with modality performance shaped by underlying physics and technical constraints. Clinically, the review helps position PCCT-enabled CCTA within the evolving diagnostic pathway for coronary artery disease by clarifying where improvements in image quality and spectral capabilities may translate into better decision-making.

Masri S, Sezdi M · Expert review of medical devices · (2026) · View on PubMed ↗

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) performed with photon-counting detector CT (PCD-CT) at 120 and 140 kVp across varying radiation doses versus NCCT on a modern energy-integrating detector CT (EID-CT) system. The study assessed image quality and dose using quantitative and qualitative metrics under different PCD-CT acquisition parameters. Establishing dose–image-quality behavior for PCD-CT in NCCT could support safer emergency CT protocols with maintained or improved diagnostic performance.

Schoenbeck D, Kroeger JR, Moenninghoff C et al. · Academic 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 summarized technical principles, clinical evidence, and practical protocols for photon-counting detector CT (PCD-CT) in cardiac imaging, with emphasis on 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 synthesizes evidence across key CCTA applications including stent and heavily calcified plaque assessment. The guidance aims to standardize protocol selection and reconstruction choices to translate PCD-CT advantages into consistent clinical performance across sites.

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 practical, step-by-step decision-making for coronary CT angiography using photon-counting detector CT (PCD-CT) in clinical settings. The key finding was that PCD-CT can improve coronary plaque component differentiation and image quality while reducing radiation dose compared with energy-integrating detector CT (EID-CT), and the article translates these capabilities into protocol selection guidance (e.g., a decision-tree approach). Scientifically, it helps standardize how clinicians choose PCD-CT scan parameters to realize the technology’s benefits in coronary imaging.

Xie C, Clarke N, Kotronias R et al. · The British journal of radiology · (2026) · View on PubMed ↗ · Free PDF ↗

Dual-energy and photon-counting computed tomography in critical care.

This narrative review summarized current evidence on dual-energy CT (DECT) techniques in critical care, focusing on how dual-energy acquisitions enable iodine maps and virtual non-contrast reconstructions that can reduce contrast dose and radiation exposure. The key finding was that DECT-derived functional/anatomic assessments—especially iodine perfusion mapping in pulmonary embolism—can improve detection and characterization while supporting rapid, high-yield imaging in critically ill patients. Clinically, the review highlights DECT as a practical imaging strategy to improve diagnostic accuracy while minimizing contrast and radiation risks in vulnerable ICU populations.

Freed A, Bogot NR, Einav S · Journal of critical care · (2026) · View on PubMed ↗

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Generated automatically on August 05, 2026. Covers PubMed articles published July 29, 2026 – August 05, 2026. Summaries are AI-generated; always consult the original publication for clinical or research decisions.