What’s New in Photon Counting CT?

May 25, 2026 · 6 articles · 10 research themes · covering May 18, 2026 – May 25, 2026

Overview

Across this week’s set of studies, photon-counting detector CT (PCD-CT)—including ultra-high-resolution variants—emerges as a central theme, with multiple groups testing how detector physics and reconstruction choices translate into clinically meaningful image quality and measurement reliability. Work in coronary imaging focuses on quantitative plaque assessment and how spatial resolution settings influence both subjective image quality and automated stenosis/plaque metrics. Complementing this, phantom and case-based evidence targets the long-standing challenge of evaluating coronary stents: photon-counting approaches, together with optimized reconstruction and denoising strategies, aim to improve visualization of stent struts and lumen dimensions while mitigating metal blooming.

A second dominant theme is dose and reconstruction optimization to preserve diagnostic performance. Studies address whether PCD-CT can maintain image quality at lower radiation doses in specific clinical contexts—non-contrast head CT for emergency neuroimaging and temporal bone CT for otologic evaluation—using quantitative detectability metrics and visual scoring to define practical dose-reduction limits. In parallel, the impact of quantum iterative reconstruction (QIR) on objective stent assessment metrics (e.g., contrast-to-noise ratio and strut thickness) highlights how algorithmic denoising can further improve measurement accuracy in photon-counting datasets.

Finally, the case report and the scoping review broaden the clinical and translational context: one demonstrates how spectral iodine mapping from PCD-CT can noninvasively assess myocardial viability in the setting of in-stent occlusion, while the pediatric imaging scoping review synthesizes evolving evidence across modalities to guide evidence-based imaging choices and identify gaps for future research.

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Coronary Artery Disease Imaging (Plaque & Stenosis)

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 deep learning–based automated coronary plaque quantification using ultra-high-resolution photon-counting detector CT (UHR-PCD-CT) at different reconstructed spatial resolutions in 70 patients with suspected coronary artery disease. Reconstructions at 0.6 mm (standard resolution), 0.4 mm (high resolution), and 0.2 mm (ultra-high resolution) were assessed for subjective image quality by two radiologists and for stenosis and plaque volumes by an automated deep-learning tool. The study is significant because it tests how spatial resolution settings affect both image quality and quantitative plaque measurements, informing optimal PCD-CT reconstruction for CAD assessment.

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

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Myocardial Viability & Scar Assessment

Photon-Counting Computed Tomography for In-Stent Occlusion: Lumen Visualization and Myocardial Viability.

This case report studied ultra-high-resolution photon-counting detector computed tomography (PCCT) in a 58-year-old man with prior right coronary artery stenting who presented with crescendo chest pain. PCCT demonstrated chronic total in-stent occlusion with robust left anterior descending-to-right coronary artery collaterals, and spectral iodine mapping identified a nonviable transmural myocardial scar. The findings suggest PCCT can noninvasively overcome metal blooming limitations of conventional CT to simultaneously visualize in-stent lumen patency and assess myocardial viability.

Nguyen KV, Nguyen VT, Nguyen NT et al. · JACC. Case reports · (2026) · View on PubMed ↗ · Free PDF ↗

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Iterative Reconstruction & Denoising Methods

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

This phantom study assessed the effect of quantum iterative reconstruction (QIR) on coronary stent assessment metrics—contrast-to-noise ratio (CNR), lumen diameter, and stent strut thickness—using ultra-high-resolution photon-counting detector CT (UHR-PCD-CT). A 3D-printed coronary phantom with four parallel vessels and three stent types (including varying 3.5-mm stent types) was imaged with retrospective helical acquisition at 120 and 140 kVp, comparing QIR settings against baseline reconstruction. The results are significant because they quantify whether QIR improves objective stent visualization and measurement accuracy in PCD-CT, which is critical for reliable in-stent evaluation.

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

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Non-Contrast Head CT for 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 photon-counting detector CT (PCD-CT) versus energy-integrating detector CT (EID-CT) for non-contrast head CT (NCCT) image quality and radiation dose across different acquisition parameters. PCD-CT at 120 and 140 kVp with varying radiation doses was evaluated against EID-CT using quantitative and qualitative image-quality metrics. The results are clinically important because they address whether PCD-CT can maintain or improve NCCT image quality while reducing dose in emergency neuroimaging.

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

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Temporal Bone CT Imaging

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

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

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

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Pediatric Imaging Practices & Evidence Synthesis

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

This scoping review studied pediatric imaging practices by systematically reviewing English-language original studies (2015–2025) and adding illustrative cases from an institutional cohort. It summarized trends and evidence across non-invasive modalities including ultrasonography, X-ray, CT, and MRI, highlighting the expanding pediatric imaging literature and the role of imaging in diagnostic work-ups. The review is significant for guiding clinicians and researchers toward evidence-based pediatric imaging choices and identifying gaps for future studies.

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

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Generated automatically on May 25, 2026. Covers PubMed articles published May 18, 2026 – May 25, 2026. Summaries are AI-generated; always consult the original publication for clinical or research decisions.