What’s New in Photon Counting CT?

September 13, 2026 · 5 articles · 5 research themes · covering September 06, 2026 – September 13, 2026

Overview

Across these studies, photon-counting CT (PCCT) is advancing on two fronts: improving patient safety through dose reduction and strengthening the reliability of quantitative/spectral information for clinical decision-making. A retrospective cohort in spontaneous intracranial hypotension suggests photon-counting detector CT myelography can substantially lower radiation dose-length product while preserving diagnostic performance for cerebrospinal fluid–venous fistulas. Complementing this, a pediatric feasibility study shows an ultra-low-dose chest PCCT protocol can reach radiograph-comparable doses while still producing qualitatively assessable scans for gross lung abnormalities—supporting PCCT as a practical platform for lowering exposure in children.

Methodologically, the work also targets the “physics-to-meaning” pipeline that makes PCCT useful for advanced imaging. A self-adaptive ring artifact reduction approach addresses spectral response and material-decomposition errors that degrade virtual monoenergetic images, improving interpretability of spectral outputs. In parallel, robust liver steatosis quantification using PCCT-derived fat fraction demonstrates maintained performance across different kVp settings and dose subgroups, aligning well with proton density fat fraction references. Finally, beyond clinical imaging, photon-counting multi-spectral CT is being leveraged to quantify component-specific cryoprotectant permeation during cryopreservation-related loading, enabling better vitrification optimization to reduce both under-loading and toxicity—highlighting PCCT’s expanding role in biomedical measurement beyond radiology.

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Photon-counting CT myelography and cerebrospinal fluid fistula detection

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) in 603 patients with spontaneous intracranial hypotension (SIH) evaluated for cerebrospinal fluid–venous fistulas (CVFs). PCD-CTM achieved substantially lower session dose-length product (DLP) than EID-CTM while maintaining diagnostic performance for detecting CVFs. The findings support photon-counting CT as a radiation-dose–sparing approach for CT myelography in SIH patients, potentially improving risk-benefit for a population that may require repeated imaging.

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 for cryopreservation and cryoprotectant permeation

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

This study used photon-counting multi-spectral X-ray computed tomography to measure how multi-component cryoprotectant chemicals permeate into a tissue surrogate during cryopreservation-related loading. The key finding was that the technique can resolve and quantify in situ cryoprotectant distribution/permeation behavior, addressing limitations of prior unvalidated measurements that fail to capture component-specific loading. Scientifically, this enables better optimization of vitrification protocols to reduce under-loading (freezing) and over-loading (chemical toxicity), improving tissue recovery outcomes.

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

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Photon-counting CT spectral imaging and artifact reduction

Self-Adaptive Ring Artifact Reduction Method for Spectral Photon Counting CT.

This paper developed a self-adaptive ring artifact reduction method for spectral photon-counting CT (PCCT), targeting ring artifacts caused by pixel-to-pixel variations in photon-counting detector spectral response and errors in material decomposition affecting virtual monoenergetic images (VMIs). The key finding is that the proposed self-adaptive approach reduces ring artifacts in reconstructed images and improves VMI quality by compensating for spectrum-response and decomposition inaccuracies. Clinically, improved artifact suppression in PCCT can enhance material decomposition reliability and diagnostic interpretability of spectral images.

Su M, Kan S, Qin W et al. · IEEE transactions on medical imaging · (2026) · View on PubMed ↗

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Photon-counting CT dose reduction and pediatric imaging

Next-gen paediatric imaging: ultra-low dose chest photon-counting CT approaching chest radiograph doses.

This feasibility study investigated an ultra-low-dose (ULD) chest photon-counting CT (PCD-CT) protocol in children (<16 years) to determine whether image quality could approach chest radiograph doses for detecting gross lung abnormalities. The key finding was that a PCD-CT ULD chest protocol with radiograph-comparable dose was feasible and produced qualitatively assessable scans in 24 consecutive pediatric patients. This supports photon-counting CT as a promising pediatric imaging platform for reducing radiation exposure while preserving clinically useful lung visualization.

Limantoro I, Torfs K, Binst J et al. · European radiology experimental · (2026) · View on PubMed ↗ · Free PDF ↗

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Photon-counting CT quantitative imaging (fat/steatosis quantification)

Robust Liver Steatosis Quantification Using Photon-Counting CT in Comparison to PDFF: Validation across Protocols and Cohorts.

This prospective study evaluated robust liver steatosis quantification using photon-counting CT–derived fat fraction (CTFF) against proton density fat fraction (PDFF) reference across protocols and cohorts, including 297 participants in a volunteer cohort and additional clinical cohorts with MASLD and heterogeneous liver diseases. The key finding was that CTFF grading performance and robustness were maintained across different kVp settings (120 vs 140) and dose subgroups, with agreement to PDFF used for validation. Scientifically and clinically, this supports PCCT-based fat quantification as a potentially more resilient alternative to PDFF for assessing liver steatosis across varying acquisition conditions and patient populations.

Xu X, Yuan J, Cai X et al. · Academic radiology · (2026) · View on PubMed ↗

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Generated automatically on September 13, 2026. Covers PubMed articles published September 06, 2026 – September 13, 2026. Summaries are AI-generated; always consult the original publication for clinical or research decisions.