What's New in Photon Counting CT? — June 05, 2026
AI-summarised digest of 24 PubMed articles on Photon Counting CT published in the last 7 days.
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What’s New in Photon Counting CT?
June 05, 2026 · 24 articles · 15 research themes · covering May 29, 2026 – June 05, 2026
Overview
Across this week’s set, photon-counting CT (PCCT) is repeatedly positioned as a next-generation detector technology that improves image quality through physics-level advantages—most notably reduced electronic noise, better energy discrimination for spectral imaging, and less beam-hardening artifact. Bench and phantom work comparing PCCT with energy-integrating CT (EID-CT) and dual-energy CT (DECT) show measurable differences in low-energy virtual monoenergetic images and iodine quantification, while clinical comparisons in urogenital imaging and temporal bone imaging suggest that these gains translate into clearer anatomy and fewer artifact-driven limitations at comparable or reduced dose.
Clinically, the dominant application themes are (1) cardiovascular CT and (2) musculoskeletal and postoperative assessment. In coronary CT angiography, early feasibility and patient-experience data indicate that first-generation PCCT can match EID-CT diagnostic performance in screening populations, while ultra-high-resolution PCCT/PCD-CTA approaches improve noninvasive characterization of in-stent restenosis by mitigating blooming and spatial-resolution constraints. In musculoskeletal care, PCCT’s high spatial resolution and spectral capabilities are leveraged for fracture/infection/inflammatory and degenerative disease characterization, quantitative joint assessment, and monitoring of implant integration and fusion—often with targeted strategies (e.g., virtual monoenergetic imaging and iterative metal artifact reduction) to improve evaluation in the presence of hardware.
Finally, several studies highlight PCCT’s growing role in quantitative biomarker imaging beyond anatomy. Segmental hepatic extracellular volume fraction derived from iodine densities predicts early liver function decline in chronic liver disease, and intratumoral normalized iodine concentration correlates with histopathologic features in head and neck squamous cell carcinoma—supporting noninvasive imaging of disease biology. Complementing these, spectral CT reviews for renal cell carcinoma emphasize protocol streamlining (fewer phases) and improved material characterization, while dose-reduction narratives and pediatric comparative evidence reinforce the broader goal of maintaining diagnostic performance while lowering radiation and/or contrast burden.
Photon-counting CT technology & spectral/physics performance
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 multi-scan CBCT achieved performance characteristics that could be benchmarked against EI-CT and PCCT under matched protocols. This is significant because it clarifies how emerging gantry-based CBCT stacks up against CT technologies for comprehensive spinal imaging with full anatomic coverage.
Bach U, Cester D, Kroschke J et al. · European journal of radiology · (2026) · 1 citations · View on PubMed ↗ · Free PDF ↗
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.
In a spectral phantom study, the authors compared three dual-energy CT (DECT) scanners (rapid kV-switching, ultrafast kV-switching, and dual-layer CT) against one photon-counting CT (PCCT) scanner for spectral performance of virtual monoenergetic images (VMIs) at 40–70 keV and for iodine maps. Across low-energy VMIs and iodine mapping, the study found measurable differences in spectral performance between the DECT systems and the PCCT system, demonstrating how reconstruction and detector technology affect iodine quantification and low-energy image quality. These results are scientifically significant because they benchmark PCCT versus DECT platforms for spectral imaging tasks that depend on accurate energy separation and iodine map reliability.
Greffier J, Salvat C, Pastor M et al. · Diagnostic and interventional imaging · (2026) · 4 citations · View on PubMed ↗ · Free PDF ↗
Dose reduction & pediatric imaging with photon-counting CT
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 (≤17 years) to evaluate radiation dose, objective image quality metrics, and iodinated contrast dose. Across included comparative studies, the key finding was that PCD-CT can improve or maintain objective image quality while potentially reducing radiation dose and/or contrast requirements relative to EID-CT, supporting its pediatric imaging potential. Clinically, these results inform evidence-based selection of detector technology to optimize dose and image quality in children undergoing CT.
Altintas Mese C, Mese I · Pediatric radiology · (2026) · View on PubMed ↗
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) using low-dose lung cancer screening protocols. It found that PCD-CT improved volumetric accuracy (and helped optimize reconstruction parameters such as slice thickness, matrix size, kernel, iterative reconstruction, and virtual monoenergetic imaging energy) compared with EID-CT under low-dose conditions. The scientific significance is that PCD-CT may enhance quantitative nodule measurement reliability in screening, which is important for longitudinal growth assessment and management decisions.
Hop JF, Greuter MJW, van Dijk M et al. · Investigative radiology · (2026) · View on PubMed ↗ · Free PDF ↗
CT Radiation Dose Reduction With Preserved Diagnostic Performance: How Far Have We Come Over 25 Years?
This narrative review summarized CT radiation dose reduction advances over ~25 years, focusing on technologies used in clinical CT and the added impact of photon-counting detector CT. It found that successive innovations—such as beam filtration, dynamic z-axis collimation, automatic tube current modulation, tube potential selection, advanced iterative reconstruction, and deep learning-based reconstruction—have substantially reduced dose, and that photon-counting CT further improves dose efficiency via electronic noise rejection and optimized photon-energy weighting. The review’s significance is that it provides a roadmap of dose-reduction milestones to guide ongoing adoption of next-generation CT systems.
McCollough CH, Yu L · AJR. American journal of roentgenology · (2026) · 2 citations · View on PubMed ↗ · Free PDF ↗
Musculoskeletal imaging (bone, joints, arthropathies) with photon-counting CT
A review of current applications of photon-counting CT in musculoskeletal imaging.
This review evaluated photon-counting computed tomography (PCCT) technology—using photon-counting (direct-conversion) detectors rather than energy-integrating CT detectors—for musculoskeletal imaging applications across clinical musculoskeletal disorders. It reports that PCCT can provide ultra-high spatial resolution, systematic spectral imaging, and electronic noise reduction without increasing radiation dose, with anticipated improvements in detecting and characterizing fractures, infections, inflammatory and degenerative arthropathies, and bone marrow disorders. Clinically, PCCT is positioned as a next-generation CT approach that could enhance diagnostic accuracy and tissue characterization in a wide range of musculoskeletal diseases.
Bousson V, Vallot A, Guétat P et al. · Diagnostic and interventional imaging · (2026) · 2 citations · View on PubMed ↗ · Free PDF ↗
Spine imaging & CSF-venous fistula / myelography with photon-counting CT
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 myelography (PCCT myelography) protocol for detecting cerebrospinal fluid (CSF)-venous fistulas in 35 adults with spontaneous intracranial hypotension whose prior imaging was inconclusive. The key finding was that the streamlined entire-spine PCCT myelographic workflow enabled detection of CSF leaks/fistulas in a busy practice setting where energy-integrating CT myelography can be limited by spatial resolution. Clinically, the protocol may improve diagnostic yield and operational efficiency for patients with suspected CSF-venous fistulas.
Schwartz FR, Huang RY, DeSalvo MN et al. · AJNR. American journal of neuroradiology · (2026) · View on PubMed ↗ · Free PDF ↗
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, a key vessel supplying the inferior anterior spinal artery. The central finding is that the high spatial resolution and other technical advantages of photon-counting CT may help overcome limitations of conventional CTA (e.g., blooming artifacts and spatial resolution constraints) for identifying this artery. Scientifically and clinically, it positions PCD-CTA as a promising noninvasive approach to better map spinal vascular anatomy relevant to spinal cord ischemia risk and planning.
Madhavan AA, Kranz PG, Kodet ML et al. · AJNR. American journal of neuroradiology · (2026) · 1 citations · 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 radiology 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 modified single-day bilateral decubitus myelography technique enabled detection of the sacral fistula that is otherwise difficult to identify. This is clinically significant because it provides a practical diagnostic approach for a rare but important cause of spontaneous intracranial hypotension.
Kodet ML, Madhavan AA · Radiology case reports · (2026) · View on PubMed ↗ · Free PDF ↗
Coronary CT angiography & coronary artery disease with photon-counting CT
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) using photon-counting CT angiography to define ductal anatomy noninvasively. Photon-counting CT angiography demonstrated a ductus connecting the descending thoracic aorta to the proximal left pulmonary artery, with multiplanar and 3D imaging enabling measurement of ductal diameter, length, and spatial relationships. The report suggests photon-counting CT can complement echocardiography when detailed PDA anatomy is needed for clinical decision-making.
Sun M, Ma X, Chen Y et al. · Cardiology in the young · (2026) · View on PubMed ↗
Evaluation of patient-reported outcomes in coronary CT angiography versus invasive coronary angiography.
This prospective patient-reported outcomes study assessed patient acceptance and emotional experiences during coronary CT angiography (CCTA) performed with either dual-source CT or photon-counting CT in 151 patients, including 69 with prior invasive coronary angiography (ICA). The study found differences in patient-reported acceptance/emotional responses between CCTA modalities and contextualized these experiences relative to prior ICA exposure. These findings are significant because they help determine whether photon-counting CCTA improves patient experience, supporting broader adoption of noninvasive coronary imaging.
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.
This retrospective single-centre study 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 participants undergoing coronary CT angiography as part of a health check programme (103 EID-CT in July 2024 vs 102 PCD-CT in January 2025). The key finding was that PCD-CT demonstrated comparable safety and effectiveness to EID-CT for detecting coronary artery disease in this screening population. This supports early clinical feasibility of first-generation PCD-CT for coronary CT angiography, potentially leveraging improved dose efficiency and image/noise performance while maintaining diagnostic performance.
Lu YW, Wang KL, Wang YW et al. · Coronary artery disease · (2026) · View on PubMed ↗
In-stent restenosis imaging (coronary & neurovascular) with photon-counting CT
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 CTA (UHR PCD-CTA) for noninvasive detection of neurovascular in-stent restenosis (ISR) in consecutive patients with prior neurovascular stent implantation. The key finding was that UHR PCD-CTA improved ISR detection accuracy compared with simulated energy-integrating detector CTA reconstructions, addressing blooming artifacts and limited spatial resolution that hinder conventional CTA. Clinically, this supports UHR PCD-CTA as a more reliable imaging option for surveillance and diagnosis of ISR without invasive angiography.
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 evaluated ultrahigh-resolution photon-counting detector CT (UHR PCD-CT) for detecting obstructive and non-obstructive coronary in-stent restenosis (ISR) in patients with coronary stents, using invasive coronary angiography (ICA) as the reference standard. Reconstructed UHR PCD-CT images at 0.2 mm slice thickness (and a 0.4 mm slice thickness EIDCT-like proxy) were assessed for ISR presence, and the study reported diagnostic performance for both obstructive (≥50%) and non-obstructive (<50%) ISR. The significance is that UHR PCCT may improve noninvasive characterization of ISR severity, potentially reducing reliance on invasive testing.
Szilveszter B, Hagar MT, Kulyassa P et al. · European journal of radiology · (2026) · 1 citations · View on PubMed ↗ · Free PDF ↗
Urogenital imaging & artifact reduction with photon-counting CT
Reduced beam hardening in urogenital imaging with photon-counting CT: a retrospective direct comparison with conventional CT.
In a retrospective direct comparison of 35 patients who underwent both energy-integrating detector CT (EIDCT) and photon-counting CT (PCCT), four radiologists evaluated image quality and beam-hardening artifacts in urogenital imaging of the lower pelvis and perirenal area. Photon-counting CT reduced beam-hardening artifacts and improved image quality relative to conventional EIDCT, particularly in perirenal fat regions affected by artifact and noise. Clinically, this suggests PCCT could improve diagnostic confidence and accuracy in urogenital CT where beam-hardening currently limits image quality.
Brandt EGS, Müller FC, Nielsen YJ et al. · Acta radiologica (Stockholm, Sweden : 1987) · (2026) · View on PubMed ↗
Temporal bone imaging with photon-counting 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) with energy-integrating CT (EICT) for temporal bone imaging using fresh frozen human temporal bone specimens scanned at clinically relevant reduced radiation doses. PCCT maintained or improved visualization of key anatomical landmarks and overall image quality compared with EICT under dose-reduced conditions. The results are important for advancing PCCT as a radiation-sparing alternative for temporal bone imaging while preserving diagnostic detail.
Pellby D, Vestin-Fredriksson M, Rönnblom A et al. · Acta radiologica (Stockholm, Sweden : 1987) · (2026) · View on PubMed ↗
Oncology biomarkers & spectral imaging (iodine quantification) with photon-counting CT
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 by contrast-enhanced photon-counting CT (PCCT) in 84 untreated patients with primary head and neck squamous cell carcinoma (HNSCC) is associated with histopathological features including tumor stage, grade, and Ki-67. Intratumoral iodine maps derived from PCCT enabled quantitative NIC calculation (tumoral iodine concentration relative to aortic iodine concentration), and the study found significant associations between NIC and tumor histopathology (as reported in the abstract). Quantifying tumor iodine uptake with PCCT may provide a noninvasive imaging biomarker reflecting tumor biology and proliferation in HNSCC.
Surov A, Diallo-Danebrock R, Sonnemann H et al. · Journal of cancer research and clinical oncology · (2026) · View on PubMed ↗ · Free PDF ↗
Renal cell carcinoma & spectral CT protocol/material characterization
Spectral CT in renal cell carcinoma: the promising role of dual-energy and photon-counting techniques.
This review evaluated how spectral CT—specifically dual-energy and photon-counting techniques—can improve imaging of renal cell carcinoma (RCC), particularly for characterizing incidentally detected renal masses. It found that spectral CT can reduce the number of CT phases needed in protocols (e.g., CT urography or renal CT), potentially lowering radiation dose while maintaining diagnostic accuracy and cost-effectiveness. Scientifically and clinically, the work supports protocol streamlining and better material characterization to distinguish cystic from solid lesions in RCC workups.
Kekelidze M, García-Figueiras R, Kolmos M et al. · Abdominal radiology (New York) · (2026) · View on PubMed ↗
Liver disease & quantitative biomarkers (fECV) with photon-counting CT
Segmental fECV measurement using PCD-CT as an early predictor of liver function decline in chronic liver disease.
This study investigated whether segmental hepatic extracellular volume fraction (fECV) measured using photon-counting detector CT (PCD-CT) can predict early liver function decline in 146 patients with chronic liver disease (CLD), using modified albumin-bilirubin (mALBI) grade as the reference outcome. The key finding was that segmental fECV derived from iodine densities in Couinaud liver segments (S2–S8) and the aorta (measured with 3-minute equilibrium phase imaging) had diagnostic accuracy for predicting early liver function decline as reflected by mALBI grade. Scientifically and clinically, this suggests PCD-CT–based segmental fECV could serve as an imaging biomarker for risk stratification and earlier monitoring of CLD progression.
Ohtani T, Shimada M, Takahashi K et al. · Abdominal radiology (New York) · (2026) · View on PubMed ↗ · Free PDF ↗
Postoperative orthopedic assessment & implant monitoring with photon-counting CT
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 using photon-counting detector CT (PCD-CT) in 19 patients. Key findings were that osseointegration (bone ingrowth to the implant) increased over time in most evaluated zones, while periprosthetic osteolysis and quantitative measures such as cortical thickness and cortical density were assessed longitudinally at day 1, 6 months, and 12 months. The results support PCD-CT as a high-resolution tool for monitoring implant-bone interface biology and osteolysis risk after wrist arthroplasty.
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 evaluated tin-filtered photon-counting detector (PCD) CT with high-energy virtual monoenergetic imaging (VMI at 120 keV) and iterative metal artifact reduction (iMAR) in patients who underwent anterior cervical discectomy and fusion (ACDF) between 2023 and 2026. The combined VMI120 plus iMAR approach improved metal artifact reduction and image quality and enhanced the assessment of intragraft and extragraft bone fusion compared with standard polychromatic imaging and iMAR alone. These findings support photon-counting CT as a clinically useful tool to reduce postoperative hardware artifacts and improve radiographic fusion evaluation after ACDF.
Abel F, Curti M, Marth T et al. · Investigative radiology · (2026) · View on PubMed ↗ · Free PDF ↗
Quantitative radiomics/morphometrics from CT (e.g., joint space width) with CT methods
Evaluation of the use of segmentation-based and deconvolution-based three-dimensional joint space width analysis of the hand and wrist.
This JBMR Plus study compared segmentation-based versus grayscale deconvolution-based three-dimensional joint space width (JSW) analysis methods for CT-derived assessment of hand and wrist arthritis damage. The key finding was that the JSW distribution outputs differed between segmentation-based and deconvolution-based approaches, and the comparison supported the relative performance/behavior of these techniques for 3D morphometric joint space quantification. This is significant because it informs which CT-based JSW method may be more sensitive and reliable for detecting and monitoring radiographic joint damage in arthritis.
Quintiens J, Waungana TH, Kuczynski MT et al. · JBMR plus · (2026) · View on PubMed ↗ · Free PDF ↗
Ultrasound-guided interventions with novel needle tracking/thermal monitoring sensors
Novel Acousto-Optic Sensor for Needle Tip Tracking and Internal Ultrasound Imaging from the Tip for Biopsy and Thermal Ablation.
This JVIR 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. Bench testing in phantoms showed accurate 3D needle tip localization relative to the ultrasound imaging plane, and ex vivo bovine liver experiments demonstrated the sensor’s ability to detect ablation margins and estimate relative temperature during ablation. The clinical significance is that this technology could improve the safety and effectiveness of ultrasound-guided biopsy and thermal ablation by providing continuous internal visualization and monitoring.
Saccenti L, Li M, Hazen L et al. · Journal of vascular and interventional radiology : JVIR · (2026) · View on PubMed ↗ · Free PDF ↗
CT historical perspective & broader musculoskeletal CT evolution
Musculoskeletal Computed Tomography Imaging: A 30-Year Perspective.
This 30-year perspective reviewed how computed tomography (CT) has been used for musculoskeletal imaging across evolving technologies (e.g., helical CT to advanced high-resolution, dose-efficient systems) in clinical practice. It highlights that CT’s superior spatial resolution and contrast have sustained its central role for detailed bone anatomy, fracture assessment, and pre-/postoperative evaluation, with newer extensions such as spectral CT for crystal characterization and metal artifact reduction, and weight-bearing cone-beam CT for joint alignment. The review underscores how ongoing CT hardware and reconstruction advances can expand diagnostic capability while managing dose in musculoskeletal care.
Omoumi P, Pastor M, Demehri S et al. · Seminars in musculoskeletal radiology · (2026) · View on PubMed ↗
Generated automatically on June 05, 2026. Covers PubMed articles published May 29, 2026 – June 05, 2026. Summaries are AI-generated; always consult the original publication for clinical or research decisions.