What’s New in Photon Counting CT?

July 28, 2026 · 9 articles · 9 research themes · covering July 21, 2026 – July 28, 2026

Overview

Across this week’s set of studies and reviews, photon-counting CT (PCD/PCCT) emerges as a central technology shift: multiple papers focus on how energy discrimination and improved dose efficiency can translate into better tissue/material characterization and diagnostic performance. In coronary imaging, PCD-CT improves detection of low-attenuation plaque compared with energy-integrating CT, with performance depending on factors such as calcified arcs, iodinated lumen, and reconstruction choices (e.g., virtual monoenergetic energies and kernel selection). Complementing this, a quantitative spectral-CT approach using a scanner-specific power-law model enables voxelwise mapping of effective atomic number and electron density, supporting more direct discrimination between materials like iodine and calcification.

Equally prominent is the move from “better images” to “usable biomarkers” and clinical workflows. A reproducibility study directly compares plaque quantification across platforms and identifies reconstruction settings that minimize variability—an important step toward cross-site, mixed-platform trial endpoints. In parallel, narrative reviews and clinical perspectives highlight how next-generation CT (including PCCT) broadens catheter-sparing, non-invasive cardiac evaluation alongside CCTA and CT-derived FFR, while heart-failure imaging is trending toward integrated, AI-enabled precision phenotyping and longitudinal risk monitoring. Outside cardiology, the pulmonary review argues that photon-counting detectors may improve low-dose, subtle-disease detection, while an ARDS study demonstrates how CT-based quantitative mechanics (deformable registration and modeling) can reveal regional strain/recruitment heterogeneity linked to ventilator-induced injury risk.

Finally, the digest reflects continued attention to practical imaging decision-making beyond new hardware. A head-to-head abdominal study suggests PCCT may enhance reader-assessed visualization of hepato-bilio-pancreatic anatomy under comparable contrast protocols, and a clinical review provides a scenario-based framework for choosing whole-body low-dose CT versus whole-body MRI in hematologic malignancies—balancing diagnostic goals with access, expertise, patient tolerance, radiation, and cost.

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Photon-Counting CT Physics & Quantitative Material Imaging

Power law spectral photon-counting CT for quantitative effective atomic number and electron density imaging.

This work developed and evaluated a scanner-specific “power law” spectral photon-counting CT method to estimate voxelwise effective atomic number (Zeff) and electron density (ρe) on a commercial spectral photon-counting CT system using a power-law model of x-ray attenuation (photoelectric, Compton, and empirical correction terms) fitted to NIST cross sections across 7–115 keV. The method enabled quantitative Zeff and ρe imaging in a QRM spectral-CT phantom containing soft-tissue-equivalent, hydroxyapatite, and iodine inserts, demonstrating applicability for tissue characterization in heterogeneous materials. Quantitative Zeff/ρe mapping from photon-counting CT could improve material discrimination (e.g., iodine vs calcification) and thereby enhance diagnostic accuracy and quantitative imaging biomarkers.

Alzaabi M, Behouch A, Tariq B et al. · Physics in medicine and biology · (2026) · View on PubMed ↗ · Free PDF ↗

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Coronary Atherosclerosis Plaque Characterization (PCD-CT vs EID-CT)

Mixed coronary plaque phantom analysis by photon-counting CT: impact of calcium and iodine on low-attenuation plaque detection.

This study used a mixed coronary plaque phantom imaged with photon-counting detector CT (PCD-CT) and compared it with energy-integrating detector CT (EID-CT) to test low-attenuation plaque (LAP) detection, varying calcium and iodine content and using full-rotation helical images as a high-resolution reference. PCD-CT improved LAP detectability relative to EID-CT, with performance strongly influenced by the presence of calcified arcs and iodinated lumen and by reconstruction settings (virtual monoenergetic energies and soft vs sharp kernels). These findings support using PCD-CT with optimized reconstruction to better quantify LAP in coronary atherosclerosis, potentially improving risk stratification in clinical trials and patient management.

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

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Cross-Platform Reproducibility & Trial Design for CT Biomarkers

Coronary plaque quantification on energy-integrating and photon-counting detector CT: reproducibility and power modeling for mixed-platform trials.

This retrospective study evaluated reproducibility of coronary plaque quantification between energy-integrating detector CT (EID-CT) and photon-counting detector CT (PCD-CT) and built a power model to inform sample-size planning for mixed-platform trials, using patients who underwent coronary CT angiography on both systems within 30 days. The key finding was that quantitative plaque characterization (including low-attenuation plaque components) varied by reconstruction kernel and iterative reconstruction strength, and the authors identified reconstruction settings that minimized variability between platforms. These results are clinically significant because they enable more reliable cross-platform plaque endpoints and more efficient trial design for therapies targeting coronary atherosclerosis.

Vecsey-Nagy M, Hagar MT, Osoria-Velasquez J et al. · European radiology · (2026) · View on PubMed ↗ · Free PDF ↗

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Pulmonary Imaging with Photon-Counting CT (Narrative/Review)

[The role of photon-counting CT technology in the detection of pulmonary diseases].

This narrative review examined how photon-counting CT technology may improve detection of pulmonary diseases compared with conventional energy-integrating CT, focusing on physical limitations such as spatial resolution, electronic noise, and low-dose image quality. The key finding is that photon-counting detector CT—via individual photon detection and energy discrimination—can provide higher dose efficiency, reduced image noise, improved spatial resolution, and intrinsic spectral imaging from a single acquisition. These advantages could translate into more reliable pulmonary diagnosis, particularly in scenarios where low radiation dose or subtle disease features limit conventional CT performance.

Rédei M, Gurza KB, Maurovich-Horvat P et al. · Orvosi hetilap · (2026) · View on PubMed ↗ · Free PDF ↗

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CT-Based Lung Mechanics in ARDS (Deformable Registration & Modeling)

Quantitative assessment of lung mechanical properties in ARDS using X-ray computed tomography.

This study assessed lung mechanical properties in acute respiratory distress syndrome (ARDS) using X-ray computed tomography combined with quantitative image processing, deformable image registration, and computational modeling to estimate regional strain, recruitment, and inferred mechanical stress. The key finding is that CT-based quantitative analysis can capture spatial heterogeneity in lung aeration and deformation that global physiologic measures miss, enabling regional mechanical characterization relevant to ventilator-induced lung injury risk. This supports CT-informed, region-specific mechanical phenotyping as a scientific basis for more individualized ventilatory management strategies in ARDS.

Gao J, Garberi R, Akor EA et al. · Intensive care medicine experimental · (2026) · View on PubMed ↗ · Free PDF ↗

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Heart Failure Imaging: Precision Phenotyping & AI-Integrated Workflows

The Future of Imaging in Heart Failure: Toward Precision Phenotyping, Integration, and Intelligence.

This review synthesized emerging imaging technologies for heart failure with an emphasis on precision phenotyping, integration, and intelligence, focusing on how imaging is moving from modality-siloed description toward integrated, predictive, patient-specific assessment. The key finding is that advances in AI (including automation for echocardiography), improved acquisition guidance, and multimodality integration are reshaping heart failure imaging workflows and enabling more actionable phenotypes. This is significant because it frames how next-generation imaging could support better risk prediction, treatment selection, and longitudinal monitoring in heterogeneous heart failure populations.

Hundertmark MJ · Current heart failure reports · (2026) · View on PubMed ↗ · Free PDF ↗

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Whole-Body Imaging Strategy in Hematologic Malignancies (CT vs MRI)

Complementary Role of Whole-Body MRI and CT in Hematologic Malignancies and Bone Marrow Disorders.

This clinical review compared whole-body low-dose CT (WBCT) and whole-body MRI (WBMRI) for hematologic malignancies and bone marrow disorders across diagnosis, staging, treatment response, and surveillance, with a practical focus on real-world constraints. The key finding is that the choice between WBCT and WBMRI depends on scenario-specific factors such as scanner access, expertise, patient tolerance, radiation considerations, and cost, with comparative evidence summarized for multiple myeloma. This is clinically significant because it provides a decision framework to optimize imaging strategy while balancing diagnostic needs and patient-centered considerations.

Ghotbi E, Frick M, Cook J et al. · Journal of computer assisted tomography · (2026) · View on PubMed ↗

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Abdominal/ Hepato-Bilio-Pancreatic Imaging Quality (PCCT vs EID-CT)

Photon-counting CT for hepato-bilio-pancreatic imaging: a qualitative head-to-head comparison with third-generation dual-source CT: preliminary results.

This retrospective single-center head-to-head study compared photon-counting detector CT (PCCT) with third-generation dual-source energy-integrating CT (EID-CT) for qualitative image quality and anatomical detail of hepato-bilio-pancreatic structures in the same patient cohort (n=25). The key finding is that PCCT provided reader-assessed image quality and anatomical depiction that were compared directly against EID-CT under largely comparable contrast-enhanced protocols, with differences also influenced by reconstruction section thickness (0.4–0.6 mm for PCCT vs 1.0 mm for EID-CT). These preliminary results are significant because they suggest PCCT may improve visualization of abdominal anatomy relevant to hepatobiliary and pancreatic diagnosis, warranting larger quantitative studies.

Foti G, Spoto F, Spezia A et al. · La Radiologia medica · (2026) · View on PubMed ↗

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Generated automatically on July 28, 2026. Covers PubMed articles published July 21, 2026 – July 28, 2026. Summaries are AI-generated; always consult the original publication for clinical or research decisions.