What's New in Photon Counting CT? — May 09, 2026
AI-summarised digest of 14 PubMed articles on Photon Counting CT published in the last 7 days.
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What’s New in Photon Counting CT?
May 09, 2026 · 14 articles · 15 research themes · covering May 02, 2026 – May 09, 2026
Overview
Across this week’s set of papers, a dominant theme is practical optimization of photon-counting CT (PCCT) to improve diagnostic confidence without changing acquisition workflows—especially through standardized reconstruction choices (virtual monoenergetic imaging, iodine maps, and iterative/spectral settings) and protocol designs tailored to specific clinical tasks. Studies in post–carotid stenting vascular follow-up and colorectal liver metastasis detection both show how tuning reconstruction parameters can enhance contrast and consistency, while a separate PCCT TAVR planning paper highlights the potential to reduce contrast dose using virtual monoenergetic reconstructions.
A second major theme is head-to-head performance gains versus conventional energy-integrating detector CT (EIDCT), with benefits that are clinically meaningful where artifacts or spatial resolution are limiting. Comparisons in urogenital CT demonstrate reduced beam-hardening degradation with PCCT, and ultra-high-resolution PCCT pulmonary angiography improves peripheral pulmonary artery visibility and subjective diagnostic confidence compared with dual-energy EIDCT. In parallel, physics-focused work supports the reliability of PCCT for downstream quantitative use: phantom data suggest improved CT number accuracy with reduced location dependence—an important prerequisite for radiotherapy planning.
Finally, the collection spans targeted anatomical and disease-specific applications—parathyroid 4D imaging, temporal bone visualization (including middle ear prostheses and the round window niche veil), and coronary lumen assessment using K-edge/spectral strategies to separate iodine–calcium attenuation. Complementing these technical advances, a scoping review maps the expanding clinical evidence base for PCCT in adult gastrointestinal malignancies, while a radiomics study applies machine learning to detect Modic type 1 changes in the lumbar spine using PCCT with MRI as reference. Together, the papers suggest PCCT is moving from “better images” toward task-specific, reproducible imaging pipelines that can improve staging, planning, and quantitative applications.
Photon-Counting CT Protocol Optimization & Reconstruction (Spectral/Iterative)
Evaluation of an Integrated Photon-Counting Detector CT Angiography Reconstruction Protocol for Carotid Artery Stents.
The study evaluated an integrated reconstruction protocol for photon-counting detector CT (PCD-CT) angiography in patients undergoing follow-up CT angiography after carotid artery stenting (CAS) between 2023 and 2025. Using a standardized, clinically feasible parameter set (e.g., 0.4-mm slices, 120-mm field of view, Qr56 kernel, QIR3 iterative reconstruction, and virtual monoenergetic imaging), the protocol was designed to improve image quality and maintain consistency across cases. This supports more reliable post-CAS vascular assessment with PCD-CT by enabling reproducible spectral/iterative reconstruction tailored for routine follow-up.
Nakashima M, Kawai T, Matsumoto K et al. · AJNR. American journal of neuroradiology · (2026) · View on PubMed ↗
Photon-Counting CT vs Energy-Integrating CT (Image Quality & Artifacts)
Reduced beam hardening in urogenital imaging with photon-counting CT: a retrospective direct comparison with conventional CT.
In a retrospective direct comparison, the study evaluated whether photon-counting CT (PCCT) reduces beam-hardening artifacts and improves image quality versus energy-integrating detector CT (EIDCT) in urogenital imaging of the lower pelvis and perirenal region. Using paired scans from 35 patients read by four radiologists, the key finding was that PCCT mitigated beam-hardening-related image degradation compared with EIDCT. This matters for diagnostic precision in urogenital CT where artifact-driven uncertainty can affect clinical decision-making.
Brandt EGS, Müller FC, Nielsen YJ et al. · Acta radiologica (Stockholm, Sweden : 1987) · (2026) · View on PubMed ↗
Photon-Counting CT Oncology (GI Malignancies)
Photon-counting CT in gastrointestinal malignancies: a scoping review.
This scoping review synthesized clinical evidence (January 2017–December 2025) on photon-counting computed tomography (PCCT) applications in adult patients with confirmed gastrointestinal malignancies. The review reports that PCCT is being studied for potential advantages including improved spatial resolution, better contrast-to-noise ratio, and reduced radiation dose relative to conventional CT, and it maps the breadth of GI oncology use cases and evidence quality. Overall, it provides a structured overview of where PCCT may offer diagnostic and/or staging benefits in GI cancer and highlights gaps to guide future prospective studies.
Spoto F, Robertis R, Monterubbiano L et al. · European journal of radiology · (2026) · View on PubMed ↗
Photon-Counting CT Oncology (Metastases & Staging Contrast)
Analysis of colorectal liver metastases in photon-counting detector CT - optimizing imaging through spectral reconstruction.
The study assessed visibility of colorectal liver metastases (CRLM) on abdominal photon-counting detector CT (PCD-CT) and aimed to optimize virtual monoenergetic image (VMI) and iodine map reconstructions to improve contrast between metastases and liver in 117 patients with 227 CRLM. By reconstructing VMI across 40–90 keV (10-keV increments) and analyzing scanner-generated iodine maps, the work identified reconstruction settings that maximize metastasis-to-liver contrast for detection. This is clinically relevant because it can improve staging accuracy for CRLM using spectral PCD-CT without changing the underlying acquisition.
Moos M, Emrich T, Nguyen M et al. · Cancer imaging : the official publication of the International Cancer Imaging Society · (2026) · View on PubMed ↗
Photon-Counting CT Radiomics & Machine Learning (Spine/Other)
Comparison of radiomics-based models for detection of Modic type 1 changes in photon-counting detector CT images of the lumbar spine.
This retrospective single-center study compared four radiomics-based machine-learning models (LASSO, Random Forest, XGBoost, and support vector machine) for detecting Modic type 1 changes in lumbar spine photon-counting detector CT (PCD-CT) images, using MRI as the reference standard in 60 patients. Across 105 extracted radiomic features from 360 segmented vertebrae (348 after quality control), the models were benchmarked for diagnostic performance in identifying Modic type 1 changes. If validated, radiomics on PCD-CT could provide an MRI-referenced, noninvasive imaging approach for characterizing degenerative vertebral endplate pathology.
Marth AA, Fritz B, Sutter R · Skeletal radiology · (2026) · View on PubMed ↗
Photon-Counting CT Cardiac & Coronary Imaging (CCTA/Coronary Lumen)
Lumen imaging in calcified coronary arteries using high-resolution Gd-enhanced color K-edge imaging with spectral photon-counting CT: a phantom study.
This phantom study evaluated lumen assessment in calcified coronary arteries using high-resolution gadolinium (Gd)-enhanced color K-edge imaging with spectral photon-counting CT (SPCCT) to overcome iodine–calcium attenuation similarity. In an anthropomorphic phantom with a hollow coronary artery containing calcifications spanning hydroxyapatite densities from 75 to 800 mg/cm³, the technique was tested for its ability to distinguish lumen from calcified plaque. The results support a spectral, K-edge–based approach that could improve coronary lumen evaluation in heavily calcified vessels in future clinical CCTA.
Dobrolinska MM, van der Werf N, Greuter M et al. · European radiology experimental · (2026) · View on PubMed ↗
Photon-Counting CT Pulmonary Angiography (PE/CTPA)
Increasing pulmonary artery visibility and diagnostic confidence with ultra-high resolution photon-counting detector CT pulmonary angiography.
This retrospective single-center study compared ultra-high-resolution photon-counting detector CT pulmonary angiography (UHR-PCD-CTPA) versus dual-energy energy-integrating detector (EID) CTPA in 227 adult examinations (n=76 at IQ50 and n=76 at IQ25 for UHR-PCD-CTPA; n=75 for dual-energy EID-CTPA). UHR-PCD-CTPA increased peripheral pulmonary artery visibility and improved subjective diagnostic image quality confidence compared with dual-energy EID-CTPA, with quantitative Hounsfield unit measurements supporting the image-quality gains. These findings suggest that photon-counting CT can enhance visualization of distal pulmonary vasculature, potentially improving diagnostic performance in suspected pulmonary embolism while leveraging higher spatial/contrast resolution.
Pannenbecker P, Rüth C, Grunz JP et al. · European radiology · (2026) · View on PubMed ↗
Photon-Counting CT Endocrine Imaging (Parathyroid/4D)
4D Parathyroid CT Using Photon-Counting Detector CT.
This article describes a 4D parathyroid CT protocol implemented on photon-counting detector CT for patients with hyperparathyroidism undergoing evaluation for parathyroid adenomas. The key concept is that photon-counting CT’s increased spatial and contrast resolution can better distinguish parathyroid adenomas from thyroid tissue and adjacent central-compartment soft tissue across multiphase timing. Clinically, this protocol aims to improve adenoma detection accuracy in 4D parathyroid imaging compared with prior energy-integrating detector CT approaches.
Mark IT, Shanblatt ER, El Sadaney AO et al. · AJNR. American journal of neuroradiology · (2026) · View on PubMed ↗
Photon-Counting CT Head & Neck/Temporal Bone (Anatomy & Prostheses)
In Vivo Visualization of the Round Window Niche Veil using Photon-Counting Detector CT.
This study investigated whether photon-counting detector CT (PCD-CT) can visualize the round window niche veil (RWNV), an anatomic barrier that may impede intratympanic medication delivery, using 80 temporal bone PCD-CT scans from April–June 2025. Two neuroradiologists independently scored each scan for partial versus complete RWNV coverage (with or without fluid), characterizing the in vivo imaging capability of PCD-CT. Demonstrating reliable RWNV visualization could improve pre-procedural planning and selection of patients for intratympanic therapies.
Neuberger KM, Farnsworth PF, Lane JI et al. · AJNR. American journal of neuroradiology · (2026) · View on PubMed ↗
Impact of Spatial Resolution on CT Imaging of Middle Ear Prostheses: Comparison of Photon-Counting and Energy-Integrating Detectors.
This phantom study evaluated how spatial resolution affects CT visualization of submillimeter middle ear prostheses using photon-counting detector CT (NAEOTOM Alpha), energy-integrating detector CT, and EID-CT with attenuating comb filters. Across different prosthesis types, photon-counting CT provided improved visualization performance at higher spatial resolution compared with conventional EID approaches, while comb-filter strategies were assessed as alternative resolution-enhancement methods. Scientifically, the results support using photon-counting CT for high-detail temporal bone imaging where prosthesis size and geometry demand submillimeter spatial resolution.
Sadeghian M, Benson JC, Farnsworth PJ et al. · AJNR. American journal of neuroradiology · (2026) · View on PubMed ↗
Photon-Counting CT Radiotherapy Physics (CT Number Accuracy/Location Dependence)
Reduction of CT number location dependency using photon-counting detector CT and virtual monoenergetic imaging.
This phantom study investigated whether photon-counting detector CT (PCD-CT) improves CT number accuracy by reducing location dependency compared with energy-integrating detector CT (EID-CT) across imaging modes, tissue types, and patient sizes for radiotherapy planning. Using a Gammex multi-energy phantom with tissue inserts (cortical bone, liver, lung, adipose) and a larger Superflab-augmented phantom, scans were performed on a Siemens NAEOTOM Alpha PCD-CT and a dual-source EID-CT system, then CT number location effects were analyzed. If confirmed, reduced location dependency with PCD-CT could improve radiotherapy dose calculations by making CT numbers more spatially stable.
Sadeghian M, Swicklik JR, McCollough CH et al. · Physics in medicine and biology · (2026) · View on PubMed ↗
Radiology Reviews: Clinical Disease Understanding (Non-PCCT)
Spontaneous Coronary Artery Dissection: Advances in Understanding and Management in Women.
This narrative review summarized advances in understanding and management of spontaneous coronary artery dissection (SCAD) in women, focusing on mechanisms such as intramural hematoma (IMH) and intimal tear, and on associated conditions including fibromuscular dysplasia. It highlights that SCAD is increasingly recognized as a cause of acute myocardial infarction in young to middle-aged women without traditional risk factors and that genetic evidence suggests a predominantly polygenic architecture. Clinically, consolidating these updates supports improved diagnosis and management strategies for a high-risk but often underrecognized condition in women.
Chai J, Saw J · Current atherosclerosis reports · (2026) · View on PubMed ↗
Pediatric Airway Imaging & Dynamic Assessment (4D CT/PCCT/MRI)
Advanced Imaging to Assess Airway Dynamics.
This review discussed imaging approaches for assessing airway dynamics in pediatric patients, contrasting endoscopy with noninvasive modalities including four-dimensional CT and photon-counting CT. It emphasizes that 4D CT can quantify tracheal collapse during free breathing and that photon-counting CT can achieve effective doses approaching chest radiography, enabling safer serial monitoring. The review also highlights MRI options (real-time cine and retrospectively gated high-resolution techniques) for radiation-free dynamic assessment, informing clinical selection of imaging strategies.
Bates AJ, Fleck RJ, Smith DF · Otolaryngologic clinics of North America · (2026) · View on PubMed ↗
Contrast Reduction & Patient Safety in PCCT
Photon counting detector CT contrast agent-reduced transcatheter aortic valve reconstruction planning: a comparative study.
This retrospective monocentric comparative study assessed contrast-agent-reduced CT protocols for transcatheter aortic valve reconstruction planning on photon-counting detector CT (PCDCT) in 162 BMI-matched examinations. Compared with standard contrast media dosing (80 mL iohexol 300 mg/mL), reduced contrast dosing (50 mL) with virtual monoenergetic reconstructions at 70, 60, and 50 keV was evaluated for adequacy of TAVR planning. If effective, contrast reduction on PCD-CT could improve patient safety and help address contrast supply constraints while maintaining planning quality.
Layer YC, Isaak A, Mesropyan N et al. · European radiology · (2026) · View on PubMed ↗
Generated automatically on May 09, 2026. Covers PubMed articles published May 02, 2026 – May 09, 2026. Summaries are AI-generated; always consult the original publication for clinical or research decisions.