What’s New in Photon Counting CT?

June 09, 2026 · 13 articles · 13 research themes · covering June 02, 2026 – June 09, 2026

Overview

Across this week’s set of papers, photon-counting detector CT (PCD-CT) themes dominate: multiple studies show that the technology’s higher spatial resolution and improved artifact handling can translate into more reliable anatomic visualization and quantitative measurements. In vascular imaging, photon-counting CT angiography improves localization of the artery of Adamkiewicz and enables noninvasive detection of neurovascular in-stent restenosis, potentially reducing reliance on invasive angiography. In congenital and neurologic applications, PCCT angiography and PCCT myelography demonstrate detailed depiction of ductal anatomy and CSF-venous fistulas, respectively—areas where conventional imaging can be limited by resolution or diagnostic ambiguity.

A second major thread is quantitative, longitudinal assessment—especially in musculoskeletal and lung imaging. Two clinical studies use PCD-CT to track osseointegration, cortical thickness/density, and zone-based periprosthetic osteolysis after total wrist arthroplasty, supporting its role as a quantitative monitoring tool. In lung cancer screening, a phantom study suggests PCD-CT can improve volumetric accuracy and identify reconstruction settings that optimize nodule measurement under low-dose constraints, which is critical for tracking growth and treatment response over time.

Finally, the digest highlights how photon-counting CT fits into broader CT evolution and technique refinement. Reviews and comparative work emphasize dose efficiency and workflow feasibility (including a 25-year dose-reduction perspective and pediatric PCD-CT vs energy-integrating CT comparisons), while spectral/virtual monoenergetic imaging combined with metal artifact reduction (iMAR) improves postoperative spine imaging quality and fusion assessment. Together, these studies position PCD-CT not only as a hardware upgrade, but as an enabling platform for better visualization, more accurate quantification, and safer—lower-dose—imaging strategies.

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Photon-counting CT angiography (PCCT/PCD-CTA) for vascular anatomy

Photon-Counting Detector CTA for Localization of the Artery of Adamkiewicz.

This study evaluated photon-counting detector CT angiography (CTA) for detecting and localizing the artery of Adamkiewicz in the context of spine imaging. The key finding is that photon-counting detector CTA’s high spatial resolution enables improved localization of this critical spinal arterial supply compared with conventional approaches (details of the localization performance were not fully visible in the truncated abstract). Clinically, more accurate identification of the artery of Adamkiewicz could improve planning and risk mitigation for procedures affecting the anterior spinal artery territory.

Madhavan AA, Kranz PG, Kodet ML et al. · AJNR. American journal of neuroradiology · (2026) · 1 citations · View on PubMed ↗ · Free PDF ↗

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Photon-counting CT for restenosis and vascular follow-up

Ultra-High-Resolution Photon-Counting CT Angiography for Noninvasive Detection of Neurovascular In-Stent Restenosis.

This prospective study assessed ultra-high-resolution photon-counting detector CTA (UHR PCD-CTA) for noninvasive detection of neurovascular in-stent restenosis (ISR) in consecutive patients after neurovascular stent implantation. The key finding is that UHR PCD-CTA was used to overcome conventional CTA limitations—specifically blooming artifacts and limited spatial resolution—by leveraging photon-counting detector performance for more accurate ISR detection (full quantitative results were not visible due to truncation). Scientifically and clinically, improved noninvasive ISR detection may reduce reliance on invasive angiography and support earlier intervention decisions.

Su CQ, Zhou C, Wu PF et al. · Stroke · (2026) · View on PubMed ↗

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Photon-counting CT for congenital heart disease anatomy

Photon-counting CT angiography for anatomical assessment of patent ductus arteriosus in a child.

This case report evaluated photon-counting CT angiography (PCCT angiography) for anatomical assessment of a patent ductus arteriosus (PDA) in a 10-year-old girl. PCCT angiography demonstrated a ductus connecting the descending thoracic aorta to the proximal left pulmonary artery and, using multiplanar and 3D reconstructions, defined ductal diameter, length, and spatial relationships. The significance is that PCCT may complement echocardiography when detailed PDA anatomy is required for clinical decision-making.

Sun M, Ma X, Chen Y et al. · Cardiology in the young · (2026) · View on PubMed ↗

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Photon-counting CT for musculoskeletal implant integration and osteolysis

Spectral CT in renal cell carcinoma: the promising role of dual-energy and photon-counting techniques.

This prospective clinical study assessed osseointegration, bone remodeling, and periprosthetic osteolysis after total wrist arthroplasty using photon-counting detector CT (PCD-CT) in 19 patients. It found that osseointegration, visualized as bone ingrowth to the implant, increased in most evaluated zones over time (with an exception noted for the capitate) and that cortical thickness/density and zone-based osteolysis could be quantified postoperatively. Scientifically and clinically, PCD-CT provides a quantitative imaging framework to monitor implant integration and early osteolysis risk after wrist arthroplasty.

Kekelidze M, García-Figueiras R, Kolmos M et al. · Abdominal radiology (New York) · (2026) · View on PubMed ↗

Evaluating osseointegration, bone remodeling and osteolysis after total wrist arthroplasty using photon-counting detector CT.

This study evaluated osseointegration, bone quality, and periprosthetic osteolysis after total wrist arthroplasty using photon-counting detector CT (PCD-CT) in 19 patients at day 1, 6 months, and 12 months postoperatively. The key finding was that bone ingrowth (osseointegration) increased across most implant zones by 12 months, alongside measurable changes in cortical thickness and cortical density and zone-based assessment of periprosthetic osteolysis. Clinically, this supports PCD-CT as a tool for monitoring early implant integration and detecting osteolysis patterns after wrist arthroplasty.

Kämmerling N, Farnebo S, Lind G et al. · Skeletal radiology · (2026) · View on PubMed ↗ · Free PDF ↗

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Photon-counting CT for quantitative lung nodule measurement

Improvement of Lung Nodule Volumetric Accuracy with Photon-counting Computed Tomography Over Energy-integrating Computed Tomography in Low-dose Screening: A Phantom Study.

This phantom study compared lung nodule volumetric accuracy and precision between photon-counting detector CT (PCD-CT) and energy-integrating detector CT (EID-CT) under low-dose lung cancer screening protocols. Using an anthropomorphic chest phantom with 12 artificial nodules and varying PCD-CT reconstruction parameters (e.g., slice thickness, matrix size, kernel, iterative reconstruction, and virtual monoenergetic imaging energy), the authors found improved volumetric accuracy with PCD-CT over EID-CT and identified reconstruction settings that optimized lung nodule volumetry. The significance is that PCD-CT may improve quantitative nodule measurement—critical for longitudinal screening and treatment response—while operating within low-dose constraints.

Hop JF, Greuter MJW, van Dijk M et al. · Investigative radiology · (2026) · View on PubMed ↗ · Free PDF ↗

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Photon-counting CT in pediatric imaging (dose and image quality comparisons)

Radiation dose and objective image quality of photon-counting detector computed tomography in pediatric imaging: a systematic review and meta-analysis.

This systematic review and meta-analysis compared photon-counting detector CT (PCD-CT) with energy-integrating detector CT (EID-CT) in pediatric patients (≤17 years) for radiation dose, objective image quality metrics, and iodinated contrast dose. The key finding was that the evidence base was synthesized to quantify differences in CTDI and objective image quality/contrast requirements between PCD-CT and EID-CT across pediatric comparative studies. Clinically, the results inform whether PCD-CT can reduce dose and/or improve measurable image quality in children while maintaining diagnostic performance.

Altintas Mese C, Mese I · Pediatric radiology · (2026) · View on PubMed ↗

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Radiation dose reduction and CT technology evolution

CT Radiation Dose Reduction With Preserved Diagnostic Performance: How Far Have We Come Over 25 Years?

This narrative review summarized progress over 25 years in CT radiation dose reduction while preserving diagnostic performance, including techniques such as added beam filtration, dynamic z-axis collimation, automatic tube current modulation, tube potential selection, advanced iterative reconstruction, and deep learning-based reconstructions. It highlighted that photon-counting detector CT further improves dose efficiency via electronic noise rejection, optimal photon-energy weighting, and high-resolution data acquisition. The significance is that it provides a roadmap of technological milestones explaining how modern CT can achieve lower patient dose without sacrificing image quality.

McCollough CH, Yu L · AJR. American journal of roentgenology · (2026) · 2 citations · View on PubMed ↗ · Free PDF ↗

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Spectral/virtual monoenergetic and metal artifact reduction (MAR/iMAR)

Photon-counting CT in Anterior Cervical Discectomy and Fusion: Improved Metal Artifact Reduction and Impact on Bone Fusion Assessment.

This retrospective study evaluated tin-filtered photon-counting detector CT (PCD-CT) combined with high-energy virtual monoenergetic imaging (VMI) and iterative metal artifact reduction (iMAR) to improve metal artifact reduction and bone fusion assessment after anterior cervical discectomy and fusion (ACDF). The key finding is that the tin-filtered PCD-CT approach using VMI (including VMI at 120 keV) with iMAR improved metal artifact reduction and affected the assessment of intragraft and extragraft bone fusion compared with standard polychromatic imaging and artifact-reduction variants (specific comparative metrics were not fully visible in the truncated abstract). Clinically, better post-ACDF imaging quality can improve the reliability of fusion evaluation and potentially guide postoperative management.

Abel F, Curti M, Marth T et al. · Investigative radiology · (2026) · View on PubMed ↗ · Free PDF ↗

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CT-based cardiovascular risk stratification (CACS/CCTA)

The emerging role of coronary computed tomography for prevention of cardiovascular disease in asymptomatic individuals.

This review examined how coronary computed tomography (CT)—including coronary artery calcium scoring (CACS) and coronary CT angiography (CCTA)—could improve cardiovascular disease prevention in asymptomatic individuals beyond traditional risk-factor algorithms. It found that direct, non-invasive visualization of coronary atherosclerosis enables a shift from population-based risk estimation to personalized, disease-based risk stratification and targeted preventive therapy. Clinically, this supports using CACS/CCTA to identify high-risk, otherwise unrecognized patients who may benefit from more intensive primary prevention.

Verpalen VA, Aboyans V, Dweck MR et al. · European journal of preventive cardiology · (2026) · View on PubMed ↗

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Photon-counting micro-CT simulation and preclinical imaging phantoms

Virtual photon-counting micro-CT platform for simulation of head and neck cancer imaging in mice.

This study developed a virtual photon-counting micro-CT (PCCT) simulation platform for mouse models of head and neck squamous cell carcinoma (HNSCC). By transferring high-resolution vasculature from an energy-integrating detector micro-CT scan into a whole-body digital phantom and using a denoising diffusion probabilistic model (DDPM) trained on material-decomposed iodine- and barium-enhanced PCCT tumor data to synthesize tumors, the authors created realistic HNSCC phantoms for PCCT imaging simulation. Scientifically, the platform enables controlled evaluation of PCCT performance and contrast-agent/tumor-distribution effects in preclinical HNSCC imaging.

Nadkarni R, Clark DP, Allphin AJ et al. · Physics in medicine and biology · (2026) · View on PubMed ↗ · Free PDF ↗

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Musculoskeletal CT advances and functional/spectral imaging (review)

Musculoskeletal Computed Tomography Imaging: A 30-Year Perspective.

This 30-year perspective reviewed the evolution of musculoskeletal computed tomography (CT), including advances from helical to high-resolution, dose-efficient systems, and emerging spectral and functional CT techniques. It highlighted that spectral CT can characterize crystal deposits and marrow edema and reduce metal artifacts, while weight-bearing cone-beam CT can assess joint alignment and CT arthrography can improve evaluation of intra-articular pathology. The review’s significance is to contextualize how modern CT methods expand musculoskeletal assessment from static bone imaging to tissue characterization and biomechanics-relevant imaging.

Omoumi P, Pastor M, Demehri S et al. · Seminars in musculoskeletal radiology · (2026) · View on PubMed ↗

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Photon-counting CT myelography for CSF-venous fistulas

Successful Streamlined Photon-Counting CT Myelography Protocol for Detection of CSF-Venous Fistulas in Busy Practice Settings.

This internal review board-approved study developed and tested a streamlined photon-counting CT (PCCT) myelography protocol for detecting CSF-venous fistulas in 35 patients with spontaneous intracranial hypotension whose prior spine imaging was inconclusive. Using fluoroscopy-guided contrast injection followed by entire-spine PCCT myelographic imaging in decubitus positioning, the authors reported successful protocol implementation in busy practice settings for CSF leak/fistula detection. The clinical significance is that PCCT myelography can overcome energy-integrating CT spatial-resolution limitations and improve workflow feasibility for diagnosing CSF-venous fistulas.

Schwartz FR, Huang RY, DeSalvo MN et al. · AJNR. American journal of neuroradiology · (2026) · View on PubMed ↗ · Free PDF ↗

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Generated automatically on June 09, 2026. Covers PubMed articles published June 02, 2026 – June 09, 2026. Summaries are AI-generated; always consult the original publication for clinical or research decisions.