What's New in Photon Counting CT? — July 02, 2026
AI-summarised digest of 23 PubMed articles on Photon Counting CT published in the last 7 days.
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What’s New in Photon Counting CT?
July 02, 2026 · 23 articles · 15 research themes · covering June 25, 2026 – July 02, 2026
Overview
Across this week’s set of papers, a clear theme is that photon-counting CT (PCD-CT) is moving from “better images” toward quantifiable, decision-relevant biomarkers. Multiple studies focus on spectral/quantitative capabilities—such as iodine density and virtual monoenergetic imaging—to improve diagnostic confidence and downstream risk stratification. Examples include predicting PD-L1 expression in NSCLC from spectral parameters, distinguishing bland versus neoplastic portal vein thrombosis using iodine density, and enhancing coronary risk assessment via more reproducible coronary artery calcium (CAC) scoring through optimized VMI reconstructions and protocol choices.
A second dominant thread is engineering-to-clinic translation: optimizing reconstruction, energy decomposition, and artifact handling to make PCD-CT robust in real-world anatomy. Physics and phantom work define performance limits (e.g., proton stopping power ratio/range estimation dimensionality) and dose–quality tradeoffs (image quality levels and SNR behavior), while clinical and technical studies address practical barriers such as metal artifacts (IMAR optimization for peripheral CTA with knee hardware) and noise reduction (AI denoising to raise diagnostic confidence in ultrahigh-resolution neurovascular CTA). Together, these results suggest that the “spectral advantage” of PCD-CT is most impactful when paired with carefully tuned acquisition/reconstruction pipelines.
Finally, several papers highlight clinical workflow implications in complex disease pathways—especially cardiovascular and neurovascular care. Reviews comparing CCTA with invasive coronary angiography emphasize how PCD-CT may further shift noninvasive assessment toward more definitive risk stratification, including high-risk plaque characterization in acute coronary syndrome. In neurovascular disorders, PCD-CTA is evaluated for post-interventional device assessment, and PCD-CT myelography is shown to improve confidence for cerebrospinal fluid–venous fistula detection in spontaneous intracranial hypotension. Overall, the literature converges on a future where PCD-CT’s spectral quantification and improved reliability can reduce uncertainty, limit invasive procedures, and standardize imaging biomarkers across sites.
Photon-Counting CT Physics & Reconstruction Optimization
Follow-up recommendation rates with abdominopelvic photon counting CT: comparison with conventional dual-energy and single-energy CT.
This phantom-based study used adult and pediatric head phantoms scanned on photon-counting CT across multiple image quality levels (IQLs) to characterize how radiation dose relates to signal-to-noise ratio (SNR) for brain parenchyma and bone. The key finding was that radiation dose increased linearly with IQL while SNR followed a non-linear relationship, enabling identification of IQL ranges that may optimize dose versus image quality. This supports evidence-based selection of IQL settings in pediatric and adult head PCCT to reduce unnecessary dose while maintaining diagnostic SNR.
Dane B, Attlassy Y, Ihionkhan E et al. · Abdominal radiology (New York) · (2026) · 1 citations · View on PubMed ↗
Photon-counting detector CT in cardiovascular imaging: technical advances, clinical applications, and future perspectives.
This review studied photon-counting detector CT (PCD-CT) and its technical advances, cardiovascular clinical applications, limitations, and future directions across the literature from 2015 to 2025. It found that PCD-CT’s improved spectral/energy discrimination and dose efficiency can enhance cardiovascular imaging tasks (e.g., coronary and congenital heart disease assessment), but current constraints include workflow/availability, remaining technical limitations, and the need for more robust clinical outcome evidence. The review’s significance is that it provides evidence-based guidance for researchers and clinical imagers on where PCD-CT is most likely to improve cardiovascular diagnosis and what gaps must be addressed for broader adoption.
Hong Z, Yao B, Wu H · The international journal of cardiovascular imaging · (2026) · View on PubMed ↗
Optimal dimensionality and fundamental limits of proton stopping power estimation with photon-counting CT material decomposition.
This physics study evaluated fundamental limits and optimal dimensionality for estimating proton stopping power ratio (SPR) and proton range from photon-counting CT (PCCT) using material decomposition, relevant to proton therapy planning. It found that increasing the number of energy measurements (and thus decomposition dimensionality) can improve SPR/range estimation accuracy, but there are theoretical constraints that define the best achievable performance for given decomposition approaches (e.g., Eigentissue decomposition). The scientific significance is that it informs how to design PCCT-based material decomposition strategies to reduce range uncertainty and potentially tighten treatment margins in proton therapy.
Larsson K, Näsmark T, Andersson J et al. · Physics in medicine and biology · (2026) · View on PubMed ↗ · Free PDF ↗
Photon-Counting CT for Cardiovascular Imaging (Coronary & Vascular Risk)
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), focusing on diagnostic value, clinical outcomes, and underlying technical principles across literature from 2015 to March 2026. The key finding was that CCTA increasingly supports noninvasive risk stratification and can reduce reliance on ICA, while ICA remains important for definitive assessment and intervention, with emerging photon-counting detector CT (PCD-CT) highlighted as a potential technical advance. Scientifically and clinically, the review clarifies how modality physics and performance trade-offs influence patient selection and workflow in coronary artery disease care.
Masri S, Sezdi M · Expert review of medical devices · (2026) · View on PubMed ↗
Coronary artery calcium scoring: expanding the new standard by photon-counting detector CT Part II: Impact of virtual monoenergetic image reconstructions with adjusted calcium scoring thresholds.
Using a chest phantom with nine calcifications scanned on a photon-counting detector CT (PCD-CT), this Part II study assessed how virtual monoenergetic image (VMI) reconstructions (50–80 keV) and adjusted coronary artery calcium (CAC) thresholds affect CAC score variability. The key finding was that VMI-based reconstructions with appropriately adjusted CAC thresholds further reduced CAC score variability compared with the optimized PCD-CT protocol from Part I. This helps refine photon-counting CT CAC scoring toward a more reproducible “new standard” for cardiovascular risk assessment.
Fink N, Koetzier LR, Zsarnoczay E et al. · European radiology · (2026) · View on PubMed ↗ · Free PDF ↗
Coronary artery calcium scoring: expanding the new standard by photon-counting detector CT-Part I: Impact of tube voltage, tube current, slice thickness, and quantum iterative reconstructions.
This phantom study investigated reproducibility of coronary artery calcium (CAC) scoring on photon-counting detector CT (PCD-CT) by varying tube voltage (90 vs 120 kVp), tube current (100% to 25% dose), slice thickness (3 mm vs 1 mm), and quantum iterative reconstruction (IR levels 1–4). The authors found that specific protocol choices substantially influenced interscan variability and proposed a new PCD-CT CAC protocol designed to decrease score variability. Clinically, a lower-variability PCD-CT CAC protocol could improve reliability of CAC-based cardiovascular risk stratification across scans and sites.
Fink N, Koetzier LR, Zsarnoczay E et al. · European radiology · (2026) · View on PubMed ↗ · Free PDF ↗
Photon-Counting CT for Cardiovascular Imaging (Congenital/Complex Heart & ACS Plaque)
Diagnostic and prognostic value of coronary computed tomography angiography and high-risk plaque assessment in acute coronary syndrome.
This review studied the diagnostic and prognostic value of coronary computed tomography angiography (CCTA) combined with high-risk plaque assessment in patients presenting with acute coronary syndrome (ACS). It found that CCTA can characterize atherosclerotic plaque composition and identify high-risk plaque features beyond stenosis grading, supporting improved risk stratification and potentially better selection for invasive coronary angiography. The clinical significance is that integrating high-risk plaque metrics from CCTA may refine ACS management by improving prediction of outcomes and guiding downstream testing.
Miceli AL, Iroulart JM, Domenech P et al. · Current problems in cardiology · (2026) · View on PubMed ↗
Photon-Counting CT for Oncology Biomarkers & Staging
Quantitative spectral parameters of photon-counting detector CT for noninvasive prediction of PD-L1 expression in non-small cell lung cancer.
This retrospective single-center study evaluated whether quantitative photon-counting CT (PCCT) spectral parameters could noninvasively predict programmed death-ligand 1 (PD-L1) expression in 63 patients with non-small cell lung cancer (NSCLC), with PD-L1 status determined by immunohistochemistry (TPS<1%, 1–49%, and ≥50%). Key arterial/venous-phase spectral measures (A/V-40 keV, A/V-70 keV, A/V-100 keV) and lesion iodine concentration were used to build predictive models for PD-L1 expression categories. If validated, PCCT-derived spectral biomarkers could help stratify NSCLC patients for immunotherapy by estimating PD-L1 without tissue sampling.
Ren J, Fu Z, Li L et al. · BMC medical imaging · (2026) · View on PubMed ↗
Photon-Counting CT for Thoracic Oncology
Photon-counting detector computed tomography in thoracic oncology: revolutionizing tumor imaging through precision and detail.
This narrative review summarized how photon-counting detector CT (PCD-CT) advances—especially intrinsic spectral imaging and improved spatial resolution/dose–image-quality tradeoffs—are being applied in thoracic oncology. The key finding is that PCD-CT can address limitations of conventional energy-integrating detector CT by enabling more precise tissue characterization and potentially better lesion assessment in the thorax. Scientifically, it consolidates current evidence and practical considerations to guide future thoracic oncology research and clinical adoption of PCD-CT.
Yanagawa M, Ueno M, Ito R et al. · Diagnostic and interventional radiology (Ankara, Turkey) · (2026) · 1 citations · View on PubMed ↗ · Free PDF ↗
Photon-Counting CT for Neurovascular & Intracranial Disorders
Impact of Deep Learning-Based Denoising on Image Quality and Diagnostic Confidence in Neurovascular Ultrahigh-Resolution Photon-Counting CT Angiography.
This retrospective single-center study evaluated the effect of a post hoc artificial intelligence-based denoising (AID) algorithm on image quality and diagnostic confidence in 42 patients undergoing neurovascular ultrahigh-resolution photon-counting CT angiography (UHR PCD-CTA). The key finding was that AID improved image quality metrics and increased reader diagnostic confidence, particularly in lower-neck and artifact-prone regions. This supports using AI denoising to extend the practical diagnostic value of photon-counting CT angiography in challenging anatomy.
Tóth A, Hagar MT, Silbergleit M et al. · AJNR. American journal of neuroradiology · (2026) · View on PubMed ↗
Photon-counting CT-angiography in comparison to digital subtraction angiography and MR-angiography for assessing intra-aneurysmal flow disrupting devices.
In a retrospective cohort of intracranial aneurysm patients treated with intra-aneurysmal flow disrupting devices (IAFD), the study compared photon-counting CT angiography (PCD-CTA) with digital subtraction angiography (DSA) and MR angiography for post-interventional assessment. The key finding was that PCD-CTA using polyenergetic, iodine, and virtual monoenergetic reconstructions (40 and 80 keV) with different head vessel kernels and iterative metal artifact reduction was evaluated against routine DSA/MRA findings for device-related flow disruption assessment. If performance is favorable, PCD-CTA could reduce reliance on invasive DSA for follow-up of IAFD-treated aneurysms.
De Beukelaer F, Wuyts LL, Wiesmann M et al. · Acta neurologica Belgica · (2026) · View on PubMed ↗ · Free PDF ↗
Photon-Counting CT for Spine & CSF Disorders
Improved Diagnostic Certainty of Photon-Counting CT Myelography Compared with Energy-Integrating CT for CSF-Venous Fistulas in Spontaneous Intracranial Hypotension.
This retrospective analysis compared photon-counting detector CT myelography (PCD-CTM) versus energy-integrating detector CT myelography (EID-CTM) for detecting cerebrospinal fluid–venous fistulas (CVFs) in 456 patients (628 CT myelography examinations) with spontaneous intracranial hypotension. Using the Duke CSF-Venous Fistula Confidence Score (DCCS) scored by two neuroradiologists, PCD-CTM improved CVF detection confidence compared with EID-CTM. Clinically, higher diagnostic certainty with PCD-CTM may accelerate correct localization of CVFs and guide targeted treatment in SIH.
Christensen SK, Kranz PG, Madhavan AA et al. · AJNR. American journal of neuroradiology · (2026) · View on PubMed ↗
Photon-Counting CT for Peripheral Artery Disease & Extremity CTA
Spectral Ultrahigh-resolution Photon-counting CT Angiography for Below-knee Peripheral Artery Disease: Impact of Extremity-specific Isotropic Reconstructions.
In a post hoc analysis of a prospective cohort of patients with below-knee peripheral artery disease (PAD) undergoing lower-limb CT angiography, the study tested how extremity-specific isotropic voxel spacing affects image quality and diagnostic performance in spectral ultrahigh-resolution photon-counting CT (dual-source PCD-CT, 120×0.2 mm collimation). The key finding was that reconstruction voxel spacing meaningfully impacted image quality/performance metrics in spectral UHR PCD-CT CTA, indicating that isotropic reconstruction conditions can be optimized for extremity imaging. This is significant because it provides practical reconstruction guidance to better exploit PCD-CT for noninvasive PAD assessment.
Griggers JI, Todoran TM, Vecsey-Nagy M et al. · Investigative radiology · (2026) · 3 citations · View on PubMed ↗
Photon-Counting CT for Breast Imaging
Orbital Imaging Modalities and Recent Updates.
This retrospective diagnostic feasibility study tested whether prone arterial-phase photon-counting detector CT (PCD-CT) with virtual monoenergetic imaging (VMI) at 40 keV and 70 keV could achieve breast lesion conspicuity comparable to dynamic contrast-enhanced T1-weighted MRI (DCE-T1WI) in 22 women with surgically confirmed primary breast cancer. The key finding was that lesion conspicuity on 40- and 70-keV VMI from a single arterial-phase PCD-CT acquisition was comparable to (and in some comparisons potentially approached) that of DCE-MRI as judged by three independent readers. If confirmed, prone PCD-CT could offer a faster, potentially lower-burden alternative for breast lesion visualization during preoperative staging.
Martin S · Radiologic clinics of North America · (2026) · View on PubMed ↗
Photon-Counting CT Virtual Imaging & Artifact/Metal Reduction
Comparison of Iterative Metal Artifact Reduction Presets In Ultra-high-resolution Photon-counting CT Angiography of Patients with Total Knee Endoprosthesis.
This study assessed how different iterative metal artifact reduction (IMAR) presets affect image quality and diagnostic performance in ultra-high-resolution photon-counting CT angiography (UHR-PCCTA) of peripheral arteries in 25 patients with total knee endoprostheses (31 lower extremities). The key finding was that IMAR settings meaningfully changed artifact burden and visualization of the popliteal vasculature in the presence of knee arthroplasty hardware. Optimizing IMAR for UHR-PCCTA could improve noninvasive peripheral artery disease evaluation when metal implants otherwise degrade vascular imaging.
Huflage H, Kunz AS, Wech T et al. · Academic radiology · (2026) · View on PubMed ↗
Pediatric pseudo-tumor of the ischio-pubic ramus in virtual non-calcium photon-counting scanner: A case report.
This case report described an 11-year-old elite athlete with an ischio-pubic ramus synchondrosis that was initially misinterpreted as a tumor on MRI, and it highlighted the role of virtual non-calcium imaging on a photon-counting CT system. The key finding was that virtual non-calcium imaging enabled straightforward interpretation and helped avoid the tumor misdiagnosis. This suggests photon-counting CT virtual non-calcium techniques may improve diagnostic accuracy for pediatric pseudo-tumor conditions while supporting low-dose imaging.
Corelli C, Balligand T, Rodriguez R et al. · Radiology case reports · (2026) · View on PubMed ↗ · Free PDF ↗
Contrast Delivery & Quantitative Iodine Protocols (PCD-CT)
A personalized iodine delivery rate-based injection protocol in coronary angiography on photon-counting CT.
The study developed and validated a personalized iodine delivery rate (IDR) injection protocol for coronary CT angiography (cCTA) using photon-counting CT in two validation groups with different injection rates (3.5 vs 5.0 mL/s). Coronary enhancement was quantified and shown to be equivalent within a predefined target range (500 ± 50 HU) after deriving an IDR formula from retrospectively calculated IDRIDEAL based on a 500 HU target at 55 keV reconstructions. This supports more patient-tailored contrast delivery for photon-counting CT cCTA, potentially improving consistency of coronary enhancement while optimizing injection parameters.
Busselot T, Giordano P, Sneyers V et al. · European radiology · (2026) · View on PubMed ↗ · Free PDF ↗
Quantitative PCD-CT Iodine for Hepatobiliary/Abdominal Pathology
Photon-counting detector CT with iodine quantification: improved distinction between bland and neoplastic portal vein thrombosis.
This retrospective single-center study evaluated whether photon-counting detector CT iodine density (ID) can distinguish bland from neoplastic portal vein thrombosis (PVT) in 104 patients with suspected PVT and hepatocellular carcinoma (HCC). Using quantitative iodine density assessment from contrast-enhanced photon-counting CT, the diagnostic performance of ID for separating bland versus neoplastic PVT was tested against classifications based on imaging, follow-up, and multidisciplinary consensus. If validated, quantitative PCD-CT iodine metrics could improve prognostic stratification in HCC by reducing misclassification of PVT subtype compared with conventional imaging criteria.
Müller L, Jorg T, Grunz JP et al. · European radiology · (2026) · View on PubMed ↗ · Free PDF ↗
CT Applications in Osteoarthritis & Musculoskeletal Imaging
The current state of computed tomography in osteoarthritis research.
This narrative review summarized the current role of computed tomography (CT) in osteoarthritis (OA) research, emphasizing CT’s use for three-dimensional structural assessment and quantitative biomarkers. The key finding was that CT enables high-resolution measurement of bone and joint features—such as osteophytes, subchondral bone cysts, sclerosis, and joint space width (JSW)—and supports 3D bone shape modeling and dynamic joint mechanics evaluation when combined with other methods. These capabilities make CT a valuable complementary tool for OA phenotyping, progression studies, and biomechanical modeling.
Yoshikawa R, Boddu A, Turmezei TD et al. · JBMR plus · (2026) · View on PubMed ↗ · Free PDF ↗
Crystal Deposition Imaging in Osteoarthritis
Lesion conspicuity assessment of prone 40-keV virtual monoenergetic imaging in arterial-phase photon-counting CT for breast cancer: a retrospective comparison with DCE-MRI.
This prospective cross-sectional diagnostic test study evaluated dual-energy CT (DECT), ultrasound (US), cone-beam CT (CBCT), and multi-energy spectral photon-counting CT (SPCCT) for detecting calcium crystal deposition in osteoarthritic hand joints, focusing on calcium pyrophosphate (CPP) and hydroxyapatite. The key finding was that SPCCT (performed ex vivo on excised joint material) and the other modalities showed measurable diagnostic performance against reference standards including compensated polarized light microscopy of synovial fluid and histology. Clinically, improved detection of CPP/hydroxyapatite deposition could refine diagnosis and phenotyping of crystal-associated osteoarthritis and guide management decisions.
Kawasaki Y, Nakajima M, Yokoyama K et al. · Japanese journal of radiology · (2026) · View on PubMed ↗ · Free PDF ↗
Audiology-Integrated Temporal Bone CT Interpretation
Conductive hearing loss and normal CT: a clinical perspective.
This clinical perspective reviews scenarios in which patients with conductive hearing loss may have normal temporal bone CT findings and discusses how photon-counting detector CT (PCD-CT) fits into audiology–imaging correlation. The key finding is that while many conductive hearing loss etiologies (e.g., otosclerosis) are expected to show CT correlates, there are real-world cases where no explanatory imaging finding is present. Clinically, it emphasizes cautious interpretation of normal temporal bone CT/PCD-CT in conductive hearing loss and supports integrating audiologic testing with imaging rather than relying on CT alone.
Rao D, Raymond MJ, Breen JT et al. · Neuroradiology · (2026) · View on PubMed ↗
Generated automatically on July 02, 2026. Covers PubMed articles published June 25, 2026 – July 02, 2026. Summaries are AI-generated; always consult the original publication for clinical or research decisions.