What’s New in Photon Counting CT?

May 22, 2026 · 6 articles · 12 research themes · covering May 15, 2026 – May 22, 2026

Overview

This week’s articles cluster around a clear theme: optimizing photon-counting detector CT (PCD-CT) to improve diagnostic performance while reducing patient burden. Multiple studies evaluate how acquisition and reconstruction choices—such as detector type (PCD vs energy-integrating), tube voltage, radiation dose, and reconstruction settings—translate into measurable changes in image quality and diagnostic metrics. Together, they provide practical evidence for protocol refinement in emergency neuroimaging (non-contrast head CT), temporal bone CT, and broader clinical workflows.

A second dominant thread is quantitative coronary assessment using PCD-CT. Research on ultra-high resolution coronary CT angiography shows that reconstruction spatial resolution can meaningfully affect both subjective image quality and deep-learning–based plaque quantification. Complementing this, phantom work demonstrates that quantum iterative reconstruction (QIR) alters objective measures relevant to coronary stent evaluation (e.g., contrast-to-noise ratio and stent strut visibility), supporting more reliable imaging of small vascular structures.

Finally, the digest highlights spectral/contrast considerations that matter for real-world patient safety. Studies compare enhancement characteristics across virtual monoenergetic reconstructions between spectral energy-integrating CT and PCD-CT while reducing iodinated contrast dose, addressing whether PCD-CT can preserve iodine-related enhancement under lower contrast loads. In parallel, a scoping review maps the rapidly expanding pediatric diagnostic imaging innovation landscape across non-invasive modalities, offering a broader context for how these technical advances may influence future pediatric practice and study design.

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Coronary CT Angiography & Plaque Quantification

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

In a prospective single-center study of 70 patients with suspected coronary artery disease (CAD) undergoing ultra-high resolution photon-counting detector CT coronary CT angiography (UHR-CCTA), deep learning–based automated plaque quantification was evaluated across reconstructed spatial resolutions (0.6 mm SR, 0.4 mm HR, and 0.2 mm UHR). The key finding was that changing spatial resolution affected both subjective image quality and the deep learning–derived quantification of coronary stenosis and plaque volumes. This is significant because it informs how to select reconstruction resolution for photon-counting CT to improve quantitative coronary assessment.

Liu Y, Li R, Zhang H et al. · Academic radiology · (2026) · View on PubMed ↗ · Free PDF ↗

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Coronary Stent Imaging & Evaluation

Effect of quantum iterative reconstruction on coronary stent assessment in ultra-high resolution photon-counting detector CT: a phantom study.

Using a 3D-printed coronary phantom with four parallel vessels and three stent types, this study assessed how quantum iterative reconstruction (QIR) affects contrast-to-noise ratio (CNR), lumen diameter, and stent strut thickness on ultra-high resolution photon-counting detector CT (UHR PCD-CT) at 120 and 140 kVp. The key finding was that QIR measurably changed objective image metrics relevant to coronary stent evaluation in UHR PCD-CT. This is significant because it supports protocol optimization for more reliable coronary stent assessment when using photon-counting CT and iterative reconstruction.

Scheuer ST, Kusk MW, Sæderup H et al. · European radiology experimental · (2026) · View on PubMed ↗ · Free PDF ↗

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Non-Contrast CT Protocol Optimization (Emergency Neuroimaging)

Photon Counting CT of the Head: Retrospective Analysis of Image Quality and Dose in Comparison to Energy Integrating Detector CT.

This retrospective study compared non-contrast head CT (NCCT) performed with photon-counting detector CT (PCD-CT) at 120 and 140 kVp and varying radiation doses versus NCCT on a modern energy-integrating detector CT (EID-CT) system. PCD-CT showed differences in image quality and dose performance across acquisition parameters, with systematic quantitative comparisons made between each PCD-CT subgroup and the EID-CT reference. The results are clinically important for optimizing emergency NCCT protocols to potentially reduce radiation dose while maintaining diagnostic image quality.

Schoenbeck D, Kroeger JR, Moenninghoff C et al. · Academic radiology · (2026) · View on PubMed ↗

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Pediatric Diagnostic Imaging Innovations (Non-invasive Modalities)

Innovations in pediatric imaging: a scoping review of the past decade with case illustrations.

This scoping review studied innovations in pediatric diagnostic imaging across non-invasive modalities (ultrasonography, X-ray, CT, and MRI) using English-language original studies published from 2015–2025, supplemented with illustrative cases from the authors’ institutional pediatric cohort. The review found a rapidly expanding pediatric imaging literature over the past decade and highlighted evolving techniques and applications across modalities. These findings are significant for clinicians and researchers because they map recent evidence and can guide future pediatric imaging practice and study design.

Beer MJ, Schaal MC, Neubauer H · World journal of pediatrics : WJP · (2026) · View on PubMed ↗

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Temporal Bone CT Protocol Optimization

Appropriate dose reduction using photon-counting detector CT for temporal bone imaging: phantom and clinical studies with helical acquisition.

This phantom and clinical study evaluated how much radiation dose could be reduced using photon-counting detector CT (PCD-CT) for temporal bone imaging while maintaining image quality equivalent to standard-dose energy-integrating detector CT (EID-CT). Using visual scoring and detectability index (d′) measurements across dose levels, the study determined a dose-reduction limit for PCD-CT that preserved temporal bone image detectability. The findings are important for reducing patient radiation exposure in temporal bone CT without sacrificing diagnostic performance.

Takahashi Y, Higaki F, Nakamura Y et al. · Japanese journal of radiology · (2026) · View on PubMed ↗ · Free PDF ↗

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Contrast Media Dose Reduction & Iodine Enhancement

Intra-patient comparison of portal-venous CT attenuation on virtual monoenergetic reconstructions: Spectral EID versus photon-counting detector CT with 30% contrast media dose reduction.

This intra-patient study compared portal-venous chest-abdomen-pelvis CT attenuation on virtual monoenergetic reconstructions between spectral energy-integrating detector CT (sEID) and photon-counting detector CT (PCD) while reducing iodinated contrast media dose by 30% for the PCD scans. The key finding was that PCD with 30% lower contrast dose produced portal-venous enhancement characteristics that could be directly compared against sEID at matched virtual monoenergetic (VME) levels. This is clinically significant because it addresses whether photon-counting CT can maintain iodine enhancement despite contrast dose reduction, potentially lowering risk of contrast-associated renal injury.

Pedersen SK, Albæk SB, Kusk MW · Radiography (London, England : 1995) · (2026) · View on PubMed ↗ · Free PDF ↗

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Generated automatically on May 22, 2026. Covers PubMed articles published May 15, 2026 – May 22, 2026. Summaries are AI-generated; always consult the original publication for clinical or research decisions.