What’s New in Photon Counting CT?

May 24, 2026 · 6 articles · 9 research themes · covering May 17, 2026 – May 24, 2026

Overview

Across these recent studies, photon-counting detector CT (PCD-CT)—including ultra-high-resolution variants—emerges as a versatile platform for both coronary and non-coronary imaging, with emphasis on optimizing acquisition and reconstruction to preserve diagnostic performance while enabling new quantitative capabilities. In coronary applications, PCD-CT supports visualization of challenging structures such as coronary stent lumens despite metal blooming, and can contribute to myocardial viability assessment through spectral iodine mapping (case report evidence). Complementing this, a prospective study shows that reconstruction spatial resolution materially affects deep learning–based automated coronary plaque quantification, highlighting that “best” settings depend on balancing subjective image quality with quantitative accuracy.

A second dominant theme is dose and image-quality management. Multiple works evaluate how to tune PCD-CT protocols—varying tube voltage, dose levels, and reconstruction approaches—to maintain image quality metrics under lower exposure. For emergency non-contrast head CT, systematic comparisons between PCD-CT and energy-integrating detector CT (EID-CT) inform protocol optimization aimed at dose reduction without sacrificing diagnostic quality. For temporal bone CT, phantom-and-clinical results define practical dose-reduction limits for PCD-CT. Finally, iterative reconstruction (quantum iterative reconstruction) is investigated in a coronary stent phantom to determine whether denoising improves objective stent assessment metrics (e.g., CNR and strut/lumen measurements), reinforcing the broader message that reconstruction choices can meaningfully influence quantitative reliability.

Outside CT performance optimization, a scoping review synthesizes pediatric imaging modalities and evidence trends from 2015–2025, mapping where clinical imaging guidance is well supported versus where research gaps remain. Together, the set reflects a field moving from “can we image it?” toward “how do we image it best?”—optimizing resolution, reconstruction, and dose while expanding quantitative and clinically actionable outputs.

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Coronary Artery Disease Imaging (Stenosis, Plaque, Viability)

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 and suspected in-stent occlusion. PCCT demonstrated chronic total in-stent occlusion with robust LAD-to-RCA collaterals, and spectral iodine mapping identified a nonviable transmural scar. The finding supports PCCT as a single noninvasive acquisition strategy to visualize coronary stent lumen despite metal blooming and to characterize myocardial viability via tissue-specific imaging.

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

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Coronary CT Reconstruction & Image Optimization (Resolution/Algorithms)

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 reconstruction spatial resolution affects deep learning–based automated coronary plaque quantification using ultra-high-resolution photon-counting detector CT (UHR-PCD-CT) in 70 patients with suspected coronary artery disease. Coronary datasets reconstructed at 0.6 mm (standard resolution), 0.4 mm (high resolution), and 0.2 mm (ultra-high resolution) were assessed by radiologists for subjective image quality and by a DL tool for stenosis and plaque volume quantification. The work supports selecting spatial resolution settings that maximize both image quality and the accuracy of automated plaque quantification on PCD-CT.

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

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Head CT Protocols & Emergency Imaging Optimization

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) image quality and radiation dose between photon-counting detector CT (PCD-CT) at 120 and 140 kVp with varying dose levels and a modern energy-integrating detector CT (EID-CT) system. PCD-CT showed performance differences across acquisition parameters, with systematic evaluation of quantitative and qualitative image-quality metrics under dose variation. Scientifically and clinically, the results inform how to optimize PCD-CT protocols for emergency NCCT while targeting dose reduction without sacrificing diagnostic image quality.

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

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Temporal Bone CT Imaging & 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 assessed how much radiation dose could be reduced using 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 and detectability index (d’) measurements across dose levels in a head phantom and clinical temporal bone images, the authors determined a dose-reduction limit for PCD-CT. The results provide practical dose-optimization guidance for temporal bone CT by leveraging PCD-CT’s performance to reduce patient exposure.

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

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Pediatric Imaging Modalities & Evidence Synthesis

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

This scoping review examined pediatric imaging modalities (ultrasonography, X-ray, CT, and MRI) across English-language original studies published from 2015–2025, supplemented with illustrative cases from the authors’ institutional cohort. The review synthesized trends and evidence gaps in how imaging is used in pediatric diagnostic work-ups over the past decade. Clinically, it helps guide selection and reporting of pediatric imaging approaches by highlighting where evidence is strongest versus where further studies are needed.

Beer MJ, Schaal MC, Neubauer H · World journal of pediatrics : WJP · (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 investigated 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 dynamic iodinated contrast circulation at 120 and 140 kVp using retrospective helical acquisition. The findings clarify whether QIR improves objective stent visualization and measurement fidelity on PCD-CT, informing reconstruction choices for accurate coronary stent evaluation.

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

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Generated automatically on May 24, 2026. Covers PubMed articles published May 17, 2026 – May 24, 2026. Summaries are AI-generated; always consult the original publication for clinical or research decisions.