What’s New in Photon Counting CT?

June 01, 2026 · 15 articles · 14 research themes · covering May 25, 2026 – June 01, 2026

Overview

Across this week’s set of studies, a dominant theme is the clinical translation of photon-counting CT (PCCT/PCD-CT) and ultra-high-resolution variants into more quantitative, dose-conscious imaging workflows. Multiple papers evaluate image quality, artifact behavior, and dose efficiency—ranging from systematic comparisons of PCCT vs conventional CT in multiple myeloma, to improvements in beam-hardening–limited urogenital imaging, and dose-reduced temporal bone and pulmonary nodule performance. Together, these results support the idea that PCCT’s detector physics can be leveraged not only for sharper images, but also for more reliable quantitative measurements under optimized protocols.

A second major theme is the move from “visual” imaging toward measurable biomarkers and patient-relevant outcomes. Quantitative CT metrics—such as segmental hepatic extracellular volume fraction for predicting early liver function decline (mALBI worsening), myocardial extracellular volume with improved reproducibility using virtual noncontrast methods, and iodine-based normalized iodine concentration in head and neck squamous cell carcinoma linked to grade and Ki-67—highlight PCCT’s potential as a noninvasive biomarker platform. In cardiology, the focus spans both technical performance (ultrahigh-resolution PCCT for in-stent restenosis and real-world screening CCTA performance) and patient-centered acceptability (PROs comparing CCTA/PCCT with invasive angiography), while a narrative review emphasizes multiparametric, AI-enabled quantitative coronary assessment (plaque biomarkers and FFR-CT context) for better risk stratification.

Finally, the digest includes complementary innovation beyond PCCT: methodological work on CT-based arthritis joint space width analysis (showing segmentation vs deconvolution approaches are not interchangeable), a procedural case report improving diagnostic yield for sacral CSF-venous fistula via modified decubitus myelography, and a translational ultrasound-guided intervention study using an acousto-optic needle stylet sensor for real-time tip tracking and ablation monitoring. Bench-level benchmarking of a gantry-based CBCT system against CT under matched protocols further underscores the broader field effort to expand high-quality imaging coverage while controlling dose and maintaining diagnostic fidelity.

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Photon-Counting CT (PCCT/PCD-CT) vs Conventional CT: Image Quality & Dose

Photon-counting detector computed tomography (PCD-CT) in multiple myeloma: a systematic review and trial sequential meta-analysis on image quality and radiation dose.

This systematic review and trial sequential meta-analysis compared photon-counting detector CT (PCD-CT) versus conventional energy-integrating detector CT (EID-CT) for image quality (sharpness) and radiation dose in patients with multiple myeloma (MM) with bone lesions. Across 41 identified studies, five comparative studies (n=170) were included to synthesize effects on CTDIvol and image-quality outcomes. The findings are intended to clarify whether PCD-CT can improve diagnostic image quality while reducing radiation dose in MM imaging.

Ohannesian VA, Taneja BC, do Amaral E Castro A et al. · Skeletal radiology · (2026) · View on PubMed ↗

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Ultra-High-Resolution PCCT for Cardiac/Coronary Imaging (ISR, CCTA, FFR-CT context)

Assessing coronary in-stent restenosis using ultrahigh-resolution photon-counting detector CT: results from a two-center study.

This two-center retrospective study evaluated ultrahigh-resolution photon-counting detector CT (UHR PCD-CT) for detecting coronary in-stent restenosis (ISR) in patients with coronary stents, using invasive coronary angiography (ICA) as the reference standard. The key finding was that UHR PCD-CT reconstructed at 0.2 mm (and compared against a 0.4 mm EID-CT-like proxy) achieved diagnostic performance for both non-obstructive (<50%) and obstructive (≥50%) ISR. Scientifically and clinically, it supports UHR PCCT as a high-resolution imaging approach for more accurate ISR characterization without relying solely on invasive testing.

Szilveszter B, Hagar MT, Kulyassa P et al. · European journal of radiology · (2026) · 1 citations · View on PubMed ↗ · Free PDF ↗

Initial clinical evaluation of photon-counting detector computed tomography for coronary artery disease in Taiwan.

This retrospective single-center clinical evaluation compared first-generation photon-counting detector CT (PCD-CT) versus third-generation energy-integrating detector CT (EID-CT) for coronary artery disease detection in 205 asymptomatic Taiwanese individuals undergoing health-check CCTA (103 EID-CT in July 2024 vs 102 PCD-CT in January 2025). The key finding was that PCD-CT was safe and effective for detecting coronary artery disease with performance that was comparable to or improved over EID-CT in this screening population. This is significant because it provides early real-world evidence that first-generation PCCT can deliver clinically useful coronary imaging benefits in routine practice.

Lu YW, Wang KL, Wang YW et al. · Coronary artery disease · (2026) · View on PubMed ↗

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Quantitative CT Biomarkers for Cardiac Tissue (Myocardial ECV)

Virtual Noncontrast Images Derived From Photon-Counting CT Enhance Inter-Reader Reproducibility of Myocardial ECV Measurement in Patients With Cardiac Devices.

This retrospective study assessed whether a single-scan virtual noncontrast (VNC) method using photon-counting CT (PCCT) improves inter-reader reproducibility of left-ventricular myocardial extracellular volume (ECV) measurement versus the standard subtraction method in 59 patients with cardiac devices and/or atrial fibrillation (AF). The VNC approach reduced misregistration-related variability and enhanced reproducibility of myocardial ECV quantification in these challenging populations. More reliable ECV measurement could improve the robustness of CT-based myocardial tissue characterization for clinical trials and patient management.

Yamakami Y, Hirasawa K, Hada H et al. · Journal of computer assisted tomography · (2026) · View on PubMed ↗

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Quantitative CT Biomarkers for Liver Function (fECV, mALBI)

Segmental fECV measurement using PCD-CT as an early predictor of liver function decline in chronic liver disease.

This study evaluated whether segmental hepatic extracellular volume fraction (fECV) measured with photon-counting detector CT (PCD-CT) in 146 patients with chronic liver disease (CLD) can predict early liver function decline using modified albumin-bilirubin (mALBI) grade. Segmental fECV derived from iodine density measurements in Couinaud liver segments (S2–S8) showed diagnostic accuracy for identifying patients at risk of mALBI grade worsening (early decline). If validated, PCD-CT–based segmental fECV could provide a noninvasive imaging biomarker for earlier prognostication of liver function deterioration in CLD.

Ohtani T, Shimada M, Takahashi K et al. · Abdominal radiology (New York) · (2026) · View on PubMed ↗ · Free PDF ↗

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Quantitative CT Biomarkers for Oncology (Iodine metrics, tumor biology)

Photon counting computed tomography in head and neck squamous cell carcinoma: iodine concentration and histopathological features.

This study evaluated 84 untreated patients with primary head and neck squamous cell carcinoma (HNSCC) using contrast-enhanced photon-counting CT (PCCT) to generate iodine maps and quantify normalized iodine concentration (NIC) in relation to histopathological features including tumor grade and Ki-67 (proliferation marker). Higher NIC was associated with more aggressive histopathological characteristics (e.g., higher grade and increased Ki-67 expression). These findings support PCCT-derived quantitative iodine metrics as a noninvasive imaging biomarker for tumor biology and potential risk stratification in HNSCC.

Surov A, Diallo-Danebrock R, Sonnemann H et al. · Journal of cancer research and clinical oncology · (2026) · View on PubMed ↗

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Quantitative CT for Musculoskeletal Disease (Arthritis JSW methods)

Evaluation of the use of segmentation-based and deconvolution-based three-dimensional joint space width analysis of the hand and wrist.

This study compared segmentation-based versus grayscale deconvolution-based three-dimensional joint space width (JSW) analysis methods on CT scans in the hand and wrist for radiographic assessment of arthritis. The key finding was that deconvolution-based 3D JSW analysis produced a different (and potentially more sensitive) JSW distribution than segmentation-based approaches, and the two methods were not interchangeable. This is clinically significant because it informs which CT-based quantitative JSW technique may better detect and monitor joint damage beyond ordinal scoring.

Quintiens J, Waungana TH, Kuczynski MT et al. · JBMR plus · (2026) · View on PubMed ↗ · Free PDF ↗

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Urogenital CT Artifact Reduction (Beam hardening, pelvis/perirenal)

Reduced beam hardening in urogenital imaging with photon-counting CT: a retrospective direct comparison with conventional CT.

This retrospective study compared photon-counting CT (PCCT) with energy-integrating CT (EIDCT) in 35 urogenital imaging patients to assess whether PCCT reduces beam-hardening artifacts and improves image quality in the lower pelvis and perirenal region. Radiologist evaluations showed improved image quality and/or reduced beam-hardening-related degradation on PCCT compared with EIDCT. The results are important because they suggest PCCT may enhance diagnostic reliability in challenging urogenital CT tasks where beam-hardening artifacts currently limit performance.

Brandt EGS, Müller FC, Nielsen YJ et al. · Acta radiologica (Stockholm, Sweden : 1987) · (2026) · View on PubMed ↗

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Temporal Bone Imaging with Dose-Efficient CT

Comparison of photon-counting CT with energy-integrating CT in temporal bone imaging: an anthropomorphic phantom study.

This anthropomorphic phantom study compared photon-counting CT (PCCT) versus energy-integrating CT (EICT) for temporal bone imaging using fresh frozen human temporal bone specimens scanned at clinically relevant reduced radiation doses. PCCT demonstrated comparable or improved visualization of key temporal bone anatomical landmarks and overall image quality relative to EICT under dose-reduced conditions. This is significant for advancing PCCT as a dose-efficient alternative for temporal bone imaging where fine bony detail is critical.

Pellby D, Vestin-Fredriksson M, Rönnblom A et al. · Acta radiologica (Stockholm, Sweden : 1987) · (2026) · View on PubMed ↗

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Noninvasive/Patient-Centered Outcomes in Cardiac CT (PROs)

Evaluation of patient-reported outcomes in coronary CT angiography versus invasive coronary angiography.

This study assessed patient-reported outcomes (PROs) for coronary CT angiography (CCTA) compared with invasive coronary angiography (ICA) in 151 patients, including those imaged with dual-source CT or photon-counting CT (PCCT). The key finding was that patient acceptance and emotional experiences differed between CCTA (including PCCT) and prior ICA, with CCTA generally being better tolerated from a patient-experience standpoint. This matters because it supports broader adoption of CCTA/PCCT not only for diagnostic effectiveness but also for patient-centered care.

von der Stück MS, Siepmann R, Corban E et al. · European journal of radiology open · (2026) · View on PubMed ↗ · Free PDF ↗

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Radiation-Efficient/Protocol Optimization for Nodule Detection (Pulmonary)

Impact of Ultra-Low-Dose Imaging on Image Quality and Volumetric Accuracy of Different Subtypes of Pulmonary Nodules using Photon-Counting Detector CT: A Phantom Study.

This phantom study evaluated ultra-high-resolution photon-counting detector CT (UHR PCD-CT) under ultra-low-dose protocols for pulmonary nodule detection rate, image quality, and volumetric accuracy across 15 pulmonary nodule models. Lower-dose scanning affected noise and contrast-to-noise characteristics, and nodule volume/dimensions measured with AI-based pulmonary nodule software showed dose-dependent accuracy. These results support optimizing PCD-CT dose settings to maintain quantitative nodule assessment performance while minimizing radiation exposure.

Wang Y, Zhou Y, Lei L et al. · The British journal of radiology · (2026) · View on PubMed ↗

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Advanced/AI-Enhanced Quantitative CT for CAD Risk Stratification (AI-QCT, plaque, FFR-CT)

Advanced Quantitative CT for Coronary Artery Disease: Integrating Stenosis-, Plaque Quantification, and FFR-CT.

This narrative review summarized advanced quantitative CT approaches for coronary artery disease (CAD), focusing on integrating stenosis assessment, plaque quantification, and FFR-CT derived from CCTA. It highlights that AI-based quantitative CT (AI-QCT) can provide more reproducible plaque biomarkers than purely visual stenosis grading, enabling improved risk stratification for major adverse cardiovascular events (MACE). The review supports a shift from stenosis-only evaluation toward multiparametric, quantitative imaging for more precise CAD prognosis and management.

Mihalcioiu S, Mengesha B, Abitbol C et al. · The British journal of radiology · (2026) · View on PubMed ↗ · Free PDF ↗

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CT-Based Diagnostic/Procedural Innovations (Myelography case)

Sacral CSF-venous fistula diagnosed using single-day bilateral decubitus myelography: A rare case and a novel technical modification.

This case report described a patient with a rare sacral (right S2) cerebrospinal fluid (CSF)-venous fistula diagnosed using single-day bilateral decubitus myelography with a novel technical modification. The key finding was that the modified decubitus myelography technique enabled detection of the sacral fistula that is otherwise difficult to identify. Clinically, it provides a practical procedural adaptation to improve diagnostic yield for suspected sacral CSF-venous fistulas causing spontaneous intracranial hypotension.

Kodet ML, Madhavan AA · Radiology case reports · (2026) · View on PubMed ↗ · Free PDF ↗

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Ultrasound-Guided Interventions with Integrated Sensing (Acousto-optic needle tracking)

Novel Acousto-Optic Sensor for Needle Tip Tracking and Internal Ultrasound Imaging from the Tip for Biopsy and Thermal Ablation.

This bench and ex vivo translational study evaluated a novel acousto-optic sensor embedded in a 24-gauge needle stylet for real-time needle tip tracking, internal ultrasound imaging, and thermal ablation monitoring under ultrasound guidance. The key finding was that the sensor enabled accurate 3D needle tip localization relative to the ultrasound plane and could detect ablation margins with relative temperature estimation in bovine liver experiments. This is clinically important because it could improve the safety and effectiveness of ultrasound-guided biopsy and thermal ablation by providing integrated guidance and monitoring at the needle tip.

Saccenti L, Li M, Hazen L et al. · Journal of vascular and interventional radiology : JVIR · (2026) · View on PubMed ↗ · Free PDF ↗

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Cone-Beam CT (CBCT) vs CT Benchmarking (Spine coverage/quality)

Gantry-based cone-beam CT of the thoracolumbar spine: A phantom comparison with Photon-Counting CT and Energy-Integrating CT.

This phantom study compared gantry-based cone-beam CT (CBCT) of the thoracolumbar spine with dose-matched energy-integrating CT (EI-CT) and photon-counting CT (PCCT) using an anthropomorphic torso phantom. The key finding was that the novel gantry-based CBCT system achieved performance that could be benchmarked against EI-CT and PCCT under matched protocols, clarifying relative image quality and visualization capability. This is significant because it helps define whether advanced CBCT can provide full spinal coverage with image quality approaching that of CT technologies, including PCCT.

Bach U, Cester D, Kroschke J et al. · European journal of radiology · (2026) · 1 citations · View on PubMed ↗ · Free PDF ↗

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Generated automatically on June 01, 2026. Covers PubMed articles published May 25, 2026 – June 01, 2026. Summaries are AI-generated; always consult the original publication for clinical or research decisions.