What’s New in Photon Counting CT?

August 28, 2026 · 8 articles · 10 research themes · covering August 21, 2026 – August 28, 2026

Overview

Across this week’s PubMed set, photon-counting detector CT (PCD/PCCT) is consistently framed as a next-generation imaging platform that improves spatial resolution and quantitative material information while enabling clinically meaningful workflow and protocol refinements. In cardiovascular imaging, evidence converges on better coronary CT angiography interpretability (less blooming and stent-related artifacts) and on practical protocol questions—such as whether nitroglycerin premedication can be safely omitted in the photon-counting era—suggesting that higher image quality may translate into simpler, more patient-friendly pathways. Complementing this, a feasibility study extends PCCT into stress myocardial perfusion imaging after arterial switch operation, indicating potential for noninvasive assessment of late coronary complications in a specialized population.

Outside cardiology, the theme broadens to both vascular and nonvascular applications where detector performance matters for morphology and quantitation. For CT pulmonary angiography, a systematic review/meta-analysis synthesizes dose, contrast use, and diagnostic performance tradeoffs between PCCT and conventional energy-integrating CT, providing evidence to guide adoption. In head/neck imaging, a retrospective comparison evaluates whether the spatial-resolution advantages of photon-counting CTA improve concordance in detecting and classifying arterial outpouchings (aneurysm vs infundibulum vs uncertain). In temporal bone imaging, photon-counting CT enables direct, software-independent measurement of vestibular aqueduct morphology, supporting radiographic markers linked to Menière’s disease endotypes.

Finally, several studies ground these clinical advances in the underlying physics of photon-counting systems. Phantom and ex vivo work highlights how acquisition parameters (dose, spatial resolution, reconstruction method) and reconstruction choices affect quantitative bone microstructure metrics, while physics experiments show that x-ray pre-filtration strategies can materially change the accuracy of material decomposition. Together, these results emphasize that optimal clinical performance with PCCT depends not only on the detector itself, but also on careful optimization of reconstruction and spectral/pre-filtration settings to preserve quantitative reliability.

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Coronary CT Angiography Optimization & Protocol Simplification

Is nitroglycerin still necessary for coronary CT angiography in the era of photon-counting CT?

This retrospective single-center study tested whether sublingual nitroglycerin remains necessary for coronary CT angiography in the photon-counting CT era by comparing diagnostic performance against invasive coronary angiography (ICA). Among 124 patients who underwent photon-counting CCTA (Jan 2023–Nov 2025) with ICA within 30 days, the cohort included patients with and without nitroglycerin premedication, and the study evaluated its impact on coronary visualization and diagnostic accuracy. The clinical significance is determining whether nitroglycerin can be safely omitted to streamline PCCT CCTA protocols without sacrificing diagnostic performance.

Kabakus IM, Maisuria DM, Chamberlin JH et al. · Journal of cardiovascular computed tomography · (2026) · View on PubMed ↗ · Free PDF ↗

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Coronary Artery Disease Imaging (PCD-CT/PCCT Clinical Evidence)

Diagnostic performance and clinical impact of photon-counting detector computed tomography in coronary artery disease.

This review studied the diagnostic performance and clinical impact of photon-counting detector CT (PCD-CT) for coronary artery disease in contemporary cardiovascular imaging evidence. Across recent studies, PCD-CT showed superior spatial resolution, improved contrast-to-noise ratio, and reduced calcium blooming and stent-related artifacts compared with conventional energy-integrating detector CT for coronary CT angiography. These advances may improve the accuracy and interpretability of coronary CT angiography, potentially changing how CAD is evaluated clinically.

Parikh R, Shin D, Ali ZA et al. · Current opinion in cardiology · (2026) · View on PubMed ↗

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CT Myocardial Perfusion Imaging (Stress MPI) with Photon-Counting CT

Stress CT myocardial perfusion imaging after arterial switch operation for transposition of the great arteries.

This clinical feasibility study evaluated stress CT myocardial perfusion imaging in adults after arterial switch operation for transposition of the great arteries (ASO-TGA) using regadenoson. Patients underwent either dynamic energy-integrating detector CT (EID-CT) with quantitative myocardial blood-flow mapping or static photon-counting detector CT (PCCT) with qualitative/semquantitative iodine-map assessment, and the study assessed feasibility and diagnostic performance. Demonstrating workable PCCT-based stress CT-MPI in this population could expand noninvasive evaluation of late coronary complications after ASO-TGA.

Gkizas C, Longere B, Domanski O et al. · European heart journal. Imaging methods and practice · (2026) · View on PubMed ↗

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CT Pulmonary Angiography (CTPA) with Photon-Counting CT

Photon-counting detector CT for CT pulmonary angiography: a systematic review and meta-analysis.

This systematic review and meta-analysis evaluated radiation dose, contrast media utilization, image quality, and diagnostic performance of photon-counting detector CT (PCCT) versus energy-integrating detector CT (EID-CT) for CT pulmonary angiography (CTPA). Across 12 studies totaling 950 patients, meta-analyses assessed CTDIvol, total iodine load, SNR, and CNR, with sensitivity analyses using Hartung-Knapp adjustment. The results are important for guiding evidence-based adoption of PCCT in CTPA by clarifying tradeoffs in dose, contrast, and diagnostic performance.

Kato S, Azuma M, Horita N et al. · European radiology · (2026) · View on PubMed ↗

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Photon-Counting CT for Vascular Morphology (Aneurysm/Infundibulum Characterization)

Detection and Characterization of Infundibula and Aneurysms: A Clinical Report-Based Comparison of PCD- and EID-CTA.

This retrospective clinical report-based comparison studied concordance between photon-counting detector CTA (PCD-CTA) and energy-integrating detector CTA (EID-CTA) for detecting and characterizing arterial outpouchings (aneurysm vs infundibulum vs uncertain) in adults with paired head/neck scans. In paired reports meeting inclusion criteria (including EID-CTA slice thickness ≤0.6 mm and excluding previously treated lesions), the study compared lesion detection and characterization performance between the two CT detector technologies. The findings are significant because they address whether higher spatial resolution from PCD-CTA translates into more consistent clinical reporting of clinically relevant vascular morphology.

Jacobson Z, El Sadaney AO, Yu L et al. · AJNR. American journal of neuroradiology · (2026) · View on PubMed ↗ · Free PDF ↗

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Photon-Counting CT for Temporal Bone & Vestibular Anatomy

The angular trajectory of the vestibular aqueduct: evaluation using photon-counting CT.

This retrospective study assessed the angular trajectory of the vestibular aqueduct (ATVA) using photon-counting CT in 64 patients (128 ears) with temporal bone scans. PCCT enabled direct visualization of the proximal vestibular aqueduct and allowed two independent readers to measure ATVA and additional vestibular aqueduct morphometrics. The ability to measure ATVA without reliance on software proxies is clinically significant for refining radiographic markers linked to developmental endotypes of Menière’s disease.

Van den Kerkhof F, Boomgaert L, Cockmartin L et al. · Insights into imaging · (2026) · View on PubMed ↗ · Free PDF ↗

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Photon-Counting CT Quantitative Bone Microstructure (Trabecular Metrics)

Assessment of trabecular microstructure using photon-counting CT: Influence of dose, spatial resolution and reconstruction algorithms.

This ex vivo study evaluated how radiation dose, spatial resolution, noise, and reconstruction algorithm affect photon-counting CT measurements of trabecular microstructure (BMD, BV/TV, and Tb.Sp) in seven excised human vertebral bodies. Using a clinical Naeotom Alpha photon-counting CT scanner, scans were performed at multiple dose levels (including 6–15 mGy in a thorax phantom) and reconstructed with filtered back projection (FBP) versus iterative reconstruction (QIR3), with repeated 15 mGy scans as reference. The findings are significant for optimizing PCCT acquisition and reconstruction to enable reliable quantitative bone microstructure assessment.

Peña JA, Thomsen F, Damm T et al. · Bone · (2026) · View on PubMed ↗

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Photon-Counting CT Physics: Pre-filtration & Material Decomposition

Material-dependent effects of x-ray pre-filtration on material decomposition in photon-counting CT.

This phantom-based physics study characterized how x-ray pre-filtration influences material decomposition performance in photon-counting CT across different filter materials and thicknesses using contrast agents spanning low-Z (iodine, barium) and high-Z (tantalum). On a CdZnTe PCCT system, single-contrast and dual-contrast phantoms were scanned with various pre-filtration conditions (e.g., brass 0.375 mm; copper, tin combinations), and material decomposition basis-map performance was quantified. The results are important for selecting pre-filtration strategies that improve quantitative material decomposition accuracy in PCCT.

Aubrey JD, Perkinson EP, Wang G et al. · Physics in medicine and biology · (2026) · View on PubMed ↗

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