What’s New in Photon Counting CT?

June 08, 2026 · 25 articles · 15 research themes · covering June 01, 2026 – June 08, 2026

Overview

Across this week’s set of studies and reviews, photon-counting CT (PCCT) emerges as a unifying theme: multiple papers compare PCCT with energy-integrating CT (EID-CT) and explore how detector physics translates into practical clinical advantages. Evidence spans improved spatial resolution, reduced beam-hardening and blooming artifacts, and enhanced metal artifact performance, with several works also emphasizing dose efficiency and protocol feasibility (including phantom benchmarking and a broader dose-reduction narrative review). Together, these results support PCCT as a next-step CT platform rather than a niche upgrade.

A second dominant thread is quantitative, spectral imaging—especially iodine/material decomposition—to derive biomarkers beyond “just images.” Studies in liver disease (segmental extracellular volume fraction from iodine densities) and head-and-neck cancer (normalized iodine concentration correlating with histopathology and Ki-67) illustrate how PCCT can act as a quantitative surrogate for tissue vascularity/perfusion and disease aggressiveness. Complementing this, a phantom comparison across dual-energy CT techniques and PCCT highlights that spectral outputs and iodine-map performance differ systematically by system and reconstruction approach—an important consideration for translating quantitative imaging across scanners.

Finally, the clinical application landscape is broadening from established neuroradiology into procedure guidance, cardiovascular imaging, and musculoskeletal care. PCCT is evaluated for coronary screening and patient experience, for detecting in-stent restenosis (coronary and neurovascular), and for noninvasive delineation of congenital ductal anatomy. In parallel, spine-focused work targets CSF-venous fistula detection using streamlined entire-spine PCCT myelography workflows and novel procedural modifications, while other orthopedic and musculoskeletal studies leverage PCCT for postoperative assessment, joint morphometry, and implant-related bone biology. Lung cancer screening and temporal bone imaging further extend the message: PCCT’s benefits are not limited to one organ system, but appear to support more accurate quantification and/or improved diagnostic reliability under clinically relevant constraints.

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Photon-counting CT technology & detector physics

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

This narrative review summarized how CT radiation dose reduction has progressed over ~25 years, highlighting major technologies from beam filtration and dynamic collimation to iterative and deep learning reconstructions, and then focusing on photon-counting detector CT (PCD-CT) as a newer dose-efficiency advance. The key finding is that PCD-CT can further improve dose efficiency through electronic noise rejection, optimal photon-energy weighting, and high-resolution data acquisition. The scientific significance is that it consolidates the cumulative evidence and engineering milestones that explain why modern CT can achieve preserved diagnostic performance at lower doses.

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

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

This phantom study evaluated a novel gantry-based cone-beam CT (CBCT) system for thoracolumbar spine imaging and compared it with dose-matched photon-counting CT (PCCT) and energy-integrating CT (EICT). The key finding was that the gantry-based CBCT achieved performance characteristics that could be benchmarked against PCCT and EICT under matched protocols for complete thoracolumbar coverage. Scientifically, it supports feasibility of comprehensive spinal CBCT and clarifies how it stacks up against emerging photon-counting CT for image quality at comparable dose.

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

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Spectral/quantitative imaging (iodine/material decomposition)

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

This review evaluated the promising role of spectral CT—specifically dual-energy and photon-counting techniques—in renal cell carcinoma (RCC), with emphasis on differentiating cystic versus solid renal masses when only limited-phase CT is available. The key finding is that spectral CT can enable energy- and material-specific characterization that may reduce the number of CT phases needed (e.g., in CT urography or renal CT protocols) while maintaining diagnostic accuracy and improving dose efficiency. This supports protocol simplification and potential radiation reduction in RCC workups using advanced CT physics.

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

Comparison of spectral performance of three dual-energy CT scanners equipped with a deep-learning image reconstruction algorithm and one photon counting CT scanner: A phantom study.

A phantom study compared spectral performance across three dual-energy CT (DECT) scanners—rapid kV-switching (R-KVSCT), ultrafast kV-switching (U-KVSCT), and dual-layer CT (DLCT)—against one photon-counting CT (PCCT) scanner using virtual monoenergetic images (VMIs) at 40–70 keV and iodine maps. The key finding was that the different DECT techniques and the PCCT system produced distinct spectral outputs on VMIs and iodine quantification, enabling system-to-system comparison of low-energy spectral behavior and iodine map performance. This is scientifically significant because it informs which CT spectral technology best supports quantitative material imaging (e.g., iodine) for clinical applications.

Greffier J, Salvat C, Pastor M et al. · Diagnostic and interventional imaging · (2026) · 4 citations · View on PubMed ↗ · Free PDF ↗

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Dose reduction & pediatric imaging

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) versus energy-integrating detector CT (EID-CT) in pediatric patients aged 17 years or younger, focusing on radiation dose, objective image-quality metrics, and iodinated contrast dose. The key finding was that the evidence base was synthesized to quantify differences in dose and objective image quality between detector technologies across pediatric comparative studies. Scientifically and clinically, the results help determine whether PCD-CT can deliver dose and/or image-quality advantages for children while informing protocol and contrast optimization.

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

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) with energy-integrating CT (EICT) for temporal bone imaging using clinically relevant reduced radiation dose protocols. The key finding was that PCCT maintained or improved image quality and visualization of temporal bone anatomical landmarks compared with EICT under dose reduction conditions. This supports PCCT as a potential route to lower dose temporal bone CT without sacrificing diagnostic detail.

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

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Musculoskeletal CT (imaging, morphometry, and reviews)

Musculoskeletal Computed Tomography Imaging: A 30-Year Perspective.

This 30-year perspective reviewed how computed tomography (CT) has evolved in musculoskeletal imaging, including advances from helical CT to high-resolution, dose-efficient systems and newer spectral and weight-bearing cone-beam approaches. The key finding is that CT remains central for bone and fracture assessment while spectral CT and related techniques expand capabilities for crystal characterization, marrow edema evaluation, and metal artifact reduction. Clinically, the review supports continued adoption and refinement of advanced CT modalities to improve diagnostic accuracy and reduce limitations in complex musculoskeletal scenarios.

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

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 for hand and wrist CT morphometry. The key finding was that the JSW distribution outputs differed between segmentation-based and deconvolution-based approaches, and the comparison addressed whether segmentation-based methods generalize beyond metacarpophalangeal joints. This is significant because it informs which 3D CT JSW technique may be more sensitive and unbiased for quantifying and monitoring arthritis-related joint damage.

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

A review of current applications of photon-counting CT in musculoskeletal imaging.

This review article assessed photon-counting CT (PCCT) technology for musculoskeletal imaging, focusing on how photon-counting detectors (direct-conversion) differ from energy-integrating CT detectors. The key finding is that PCCT enables ultra-high spatial resolution, systematic spectral imaging, and electronic noise reduction without increasing radiation exposure, with broad potential across fractures, infections, inflammatory and degenerative arthropathies, and bone marrow disorders. Clinically, this positions PCCT as a next-generation CT approach that could improve detection and characterization of musculoskeletal disease while maintaining dose efficiency.

Bousson V, Vallot A, Guétat P et al. · Diagnostic and interventional imaging · (2026) · 2 citations · View on PubMed ↗ · Free PDF ↗

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CT angiography (coronary, neurovascular, and patient-centered outcomes)

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

This study evaluated patient-reported outcomes (PROs) for coronary CT angiography (CCTA) versus invasive coronary angiography (ICA) in 151 patients undergoing CCTA with either dual-source CT or photon-counting CT. The key finding was that patient acceptance and emotional experiences during CCTA were measurable and compared against prior ICA experience within the cohort. This is significant because it addresses tolerability and patient-centered outcomes that influence adoption of noninvasive coronary imaging strategies.

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

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

In a retrospective single-centre study in Taiwan, 205 asymptomatic individuals from a health check programme undergoing coronary CT angiography were compared between first-generation photon-counting detector CT (PCD-CT; n=102) and third-generation energy-integrating detector CT (EID-CT; n=103) for coronary artery disease detection. The study’s key finding was that the first-generation PCD-CT demonstrated comparable safety and effectiveness to third-generation EID-CT for detecting coronary artery disease in this screening population. This provides early clinical evidence that PCD-CT can be used for coronary CT angiography with potential improvements in dose efficiency, resolution, and noise performance.

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

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In-stent restenosis detection (coronary/neurovascular)

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

This prospective study evaluated ultra-high-resolution photon-counting detector CT angiography (UHR PCD-CTA) in consecutive patients with prior neurovascular stent implantation (July–November 2025) to detect neurovascular in-stent restenosis (ISR). The study’s premise is that photon-counting CT reduces blooming artifacts and improves spatial resolution compared with conventional energy-integrating CTA, enabling more accurate ISR detection. If confirmed, UHR PCD-CTA could provide a more reliable noninvasive alternative to invasive angiography for monitoring neurovascular stents.

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

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

This two-center retrospective study assessed diagnostic accuracy of ultrahigh-resolution photon-counting detector CT (UHR PCD-CT) for 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 0.4 mm slice thickness (with 0.4 mm serving as an EIDCT-like proxy) could classify ISR as non-obstructive (<50%) versus obstructive (≥50%) with clinically relevant performance (details truncated). If validated, UHR PCD-CT could improve noninvasive ISR detection and reduce reliance on repeat invasive angiography.

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

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CT for liver disease & biomarkers

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

In 146 patients with chronic liver disease (CLD), segmental hepatic extracellular volume fraction (fECV) was measured using photon-counting detector CT (PCD-CT) with 3-minute equilibrium-phase imaging to predict early liver function decline as reflected by modified albumin-bilirubin (mALBI) grade. The key finding was that segmental fECV derived from iodine densities in Couinaud segments (S2–S8) had diagnostic accuracy for predicting early liver function decline based on mALBI grading. This suggests that PCD-CT–based segmental fECV could serve as an early, imaging-derived biomarker for impending 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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Oncology with spectral/PCCT biomarkers and simulation

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

The study developed a virtual photon-counting micro-CT (PCCT) simulation platform for mouse models of head and neck squamous cell carcinoma (HNSCC), using a digital phantom built from mouse whole-body (MOBY) vasculature and tumor contrast distributions. Key steps included transferring high-resolution vasculature from an energy-integrating detector micro-CT scan via affine warps and training a denoising diffusion probabilistic model (DDPM) on material-decomposed iodine- and barium-enhanced mouse tumors to synthesize realistic tumor–vascular PCCT phantoms. This provides a data-driven tool to test and optimize PCCT imaging strategies for HNSCC in vivo before animal or clinical deployment.

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

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

This study investigated whether normalized iodine concentration (NIC) measured with contrast-enhanced photon-counting CT (PCCT) correlates with histopathological features in 84 patients with primary untreated head and neck squamous cell carcinoma (HNSCC). The key finding was an association between intratumoral iodine concentration (quantified from iodine maps) and tumor histopathology metrics such as stage/grade and proliferation marker Ki-67 (as reported in the truncated abstract). Scientifically, it supports PCCT-derived quantitative perfusion/vascularity surrogates as imaging biomarkers that may reflect tumor aggressiveness in HNSCC.

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

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Postoperative spine imaging & CSF-venous fistula diagnosis

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

This internal review board-approved clinical study developed and tested a streamlined entire-spine photon-counting CT myelography (PCCT myelography) protocol for detecting CSF-venous fistulas in patients with spontaneous intracranial hypotension. In 35 patients with prior inconclusive spine imaging, the key finding was that the streamlined PCCT workflow (fluoroscopic contrast injection, decubitus transport to the PCCT scanner, and PCCT acquisition) enabled practical detection of CSF leaks/fistulas in busy practice settings. Clinically, it addresses a spatial-resolution limitation of energy-integrating CT myelography by leveraging PCCT to improve diagnostic yield for CSF leak localization.

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

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

This case report described a rare sacral CSF-venous fistula (right S2) diagnosed using single-day bilateral decubitus myelography with a novel technical modification. The key finding was that the specific modified decubitus myelography technique enabled detection of the sacral fistula that is otherwise difficult to identify. The clinical significance is that it provides a practical procedural template for diagnosing sacral CSF-venous fistulas in patients with spontaneous intracranial hypotension.

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

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Spine vascular imaging (artery of Adamkiewicz and related)

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

This article described the emerging use of photon-counting detector CT angiography (PCD-CTA) for localizing the artery of Adamkiewicz, the dominant feeder to the inferior anterior spinal artery. The key finding is that the high spatial resolution and other advantages of photon-counting CT are being leveraged to improve visualization and localization in spine vascular applications. Scientifically and clinically, this supports expanding PCCT beyond established neuroradiology uses toward more precise identification of critical spinal blood supply for safer diagnosis and intervention.

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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Thermal ablation & image-guided needle monitoring

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

A novel acousto-optic sensor embedded in a 24-gauge needle stylet (125-micron sensor) was evaluated for real-time 3D needle tip tracking, internal ultrasound imaging from the tip, and thermal ablation monitoring under ultrasound guidance using phantom and bovine liver ex vivo models. Bench testing showed measurable in-plane needle localization accuracy relative to the ultrasound imaging plane and defined detection-range thresholds, while ex vivo bovine liver experiments demonstrated the sensor’s ability to detect ablation margins and estimate relative temperature during water-bath ablation. This supports a clinically relevant, integrated needle-based platform for improving targeting and intra-procedural monitoring during biopsy and thermal ablation under ultrasound guidance.

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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Metal artifact reduction & postoperative orthopedic assessment

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

This prospective clinical study evaluated osseointegration, bone remodeling, and periprosthetic osteolysis after total wrist arthroplasty in 19 patients using photon-counting detector CT (PCD-CT) at postoperative day 1, 6 months, and 12 months. The key finding was that osseointegration (bone ingrowth to the implant) increased across most evaluated zones over time, while cortical thickness/density and zone-based osteolysis assessment were used to characterize periprosthetic bone changes. Scientifically, it demonstrates that PCD-CT can quantify early and longitudinal implant-related bone biology, potentially improving monitoring of arthroplasty outcomes.

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

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

This retrospective study assessed tin-filtered photon-counting CT (PCD-CT) combined with high-energy virtual monoenergetic imaging (VMI at 120 keV) and iterative metal artifact reduction (iMAR) in patients after anterior cervical discectomy and fusion (ACDF) (postoperative scans 2023–2026). The key finding was that the PCD-CT approach improved metal artifact reduction and image quality and enhanced assessment of intragraft and extragraft bone fusion compared with standard polychromatic reconstructions and/or iMAR-only approaches. Clinically, this could improve postoperative evaluation of fusion and hardware-related imaging reliability in ACDF patients.

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

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Urogenital CT & artifact mitigation

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

This retrospective direct comparison evaluated photon-counting CT (PCCT) versus energy-integrating CT (EIDCT) for urogenital imaging of the lower pelvis and perirenal area in 35 patients scanned with both modalities. The key finding was that PCCT reduced beam-hardening artifacts and improved image quality (subjective and quantitative) relative to EIDCT in the perirenal fat and adjacent regions. Clinically, this could increase diagnostic precision in urogenital CT where beam-hardening artifacts currently limit image interpretation.

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

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Lung cancer screening & quantitative nodule tracking

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. The key finding was that PCD-CT improved volumetric accuracy versus EID-CT and that reconstruction parameters (including slice thickness, matrix size, kernel, iterative reconstruction, and virtual monoenergetic imaging energy) could be optimized to further enhance lung nodule volumetry. Clinically, this supports using PCD-CT and tailored reconstruction to improve quantitative nodule tracking in low-dose screening.

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

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Cardiac congenital anatomy & noninvasive vascular delineation

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

This case report studied a 10-year-old girl with patent ductus arteriosus (PDA) to assess whether photon-counting CT angiography (PCCT-A) could delineate ductal anatomy noninvasively. Photon-counting CT angiography demonstrated a ductus connecting the descending thoracic aorta and the proximal left pulmonary artery, with multiplanar and 3D measurements of ductus diameter, length, and spatial relationships. The clinical significance is that PCCT may complement echocardiography when detailed ductal anatomy is required for management planning.

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

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Generated automatically on June 08, 2026. Covers PubMed articles published June 01, 2026 – June 08, 2026. Summaries are AI-generated; always consult the original publication for clinical or research decisions.