What’s New in Photon Counting CT?

September 16, 2026 · 4 articles · 4 research themes · covering September 09, 2026 – September 16, 2026

Overview

Across these studies, photon-counting detector CT (PCD-CT) is shown to improve both quantitative reliability and clinical utility by leveraging energy-resolved information. A key physics/quantitative theme is that virtual monoenergetic image (VMI) CT values in PCD-CT are driven more by the selected VMI energy than by the acquisition tube voltage, which can reduce kV-dependent variability and support more consistent quantitative comparisons. Complementing this, protocol-focused work in CT myelography indicates that photon-counting CT can substantially lower radiation dose while preserving diagnostic performance for cerebrospinal fluid–venous fistulas in spontaneous intracranial hypotension.

Clinically, photon-counting CT is also moving toward noninvasive biomarkers of disease vulnerability. In coronary CT angiography, the pericoronary fat attenuation index (pFAI) measured on photon-counting CT correlated with high-risk plaque features, suggesting a pathway to imaging-derived risk stratification without invasive sampling. Finally, translational imaging innovation extends beyond conventional diagnostics: multispectral photon-counting CT enables component-sensitive mapping of cryoprotectant diffusion during cryopreservation-related loading, addressing a practical bottleneck in optimizing vitrification to avoid under-loading and toxicity.

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Photon-Counting CT Physics & Quantitative Imaging

Influence of X-ray Tube Voltage on Computed Tomography Values and Contrast-Noise Ratios in Virtual Monoenergetic Images in routine clinical Photon Counting Detector Computed Tomography: Does kV Still Matter?

This study evaluated how X-ray tube voltage (kV) affects virtual monoenergetic image (VMI) CT values and contrast-to-noise ratio (CNR) in routine clinical photon-counting detector CT (PCD-CT) across multiple tissue types, VMI keV levels, kV settings, and phantom sizes. The key finding was that VMI CT values in PCD-CT are largely governed by the selected VMI energy (keV) rather than the acquisition kV, and the optimal kV for maximizing CNR depends on the chosen VMI energy and phantom characteristics. This supports more reliable quantitative comparisons across scans in PCD-CT by reducing kV-driven variability when using VMI, while still guiding protocol optimization for best contrast performance.

Jeukens CRLPN, Pinckaers FME, Martens B et al. · Investigative radiology · (2026) · View on PubMed ↗ · Free PDF ↗

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Photon-Counting CT Protocol Optimization & Radiation Dose Reduction

Photon-Counting Detector vs Energy-Integrating Detector CT Myelography for Detecting CSF-Venous Fistulas in Spontaneous Intracranial Hypotension: Substantially Lower Radiation Dose.

This retrospective single-center cohort study compared photon-counting detector CT myelography (PCD-CTM) versus energy-integrating detector CT myelography (EID-CTM) for detecting cerebrospinal fluid–venous fistulas (CVFs) in patients with spontaneous intracranial hypotension (SIH). The key finding was that PCD-CTM achieved substantially lower session dose-length product (DLP) than EID-CTM while maintaining the ability to detect CVFs. Clinically, this indicates that photon-counting CT can reduce radiation exposure for SIH workups requiring multiacquisition CT myelography.

Christensen S, Kranz PG, Malinzak MD et al. · AJNR. American journal of neuroradiology · (2026) · 1 citations · View on PubMed ↗ · Free PDF ↗

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Photon-Counting CT Coronary Plaque Vulnerability Biomarkers

Association Between Pericoronary Fat Attenuation Index and High-Risk Plaque Features Assessed by Photon-Counting CT.

This prospective cross-sectional study in 119 consecutive patients with suspected coronary artery disease (CAD) assessed whether the pericoronary fat attenuation index (pFAI) correlates with high-risk plaque (HRP) features on photon-counting CT coronary CT angiography (PCCT-CCTA). The key finding was that higher pFAI was associated with the presence and characteristics/number of HRP features identified on PCCT-CCTA. Scientifically and clinically, pFAI measured on photon-counting CT may serve as a noninvasive imaging biomarker reflecting coronary plaque vulnerability.

Kong L, Li B, Han Y et al. · Journal of inflammation research · (2026) · View on PubMed ↗ · Free PDF ↗

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Photon-Counting CT Multispectral Imaging for Cryopreservation

Photon counting multi-spectral x-ray computed tomography of multi-component cryoprotectant diffusion into tissue surrogate.

This Physics in Medicine and Biology study used photon-counting multi-spectral X-ray computed tomography to quantify how multi-component cryoprotectant chemicals permeate into a tissue surrogate during cryopreservation-related loading. The key finding was that multi-spectral photon-counting CT enables in situ, component-sensitive mapping of cryoprotectant diffusion/loading, addressing limitations of prior unvalidated permeation measurements. This is significant for improving vitrification protocols by better controlling cryoprotectant loading to avoid under-loading (freezing) and over-loading (chemical toxicity).

Ali AM, Ali A, Parker JT et al. · Physics in medicine and biology · (2026) · View on PubMed ↗ · Free PDF ↗

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Generated automatically on September 16, 2026. Covers PubMed articles published September 09, 2026 – September 16, 2026. Summaries are AI-generated; always consult the original publication for clinical or research decisions.