What’s New in Photon Counting CT?

June 07, 2026 · 25 articles · 15 research themes · covering May 31, 2026 – June 07, 2026

Overview

This week’s digest is dominated by translational and clinical momentum behind photon-counting CT (PCCT/PCD-CT): multiple studies compare PCCT with conventional energy-integrating CT (EID-CT) or dual-energy CT (DECT), focusing on whether PCCT’s spectral accuracy, artifact behavior, and dose efficiency translate into better diagnostic performance. Across domains, the recurring message is that photon-counting detectors can improve quantitative imaging—through iodine mapping, virtual monoenergetic imaging, and reduced electronic noise—while supporting dose-conscious protocols (including pediatric evidence and low-dose lung screening).

Clinically, PCCT is being pushed into high-stakes vascular and oncology follow-up. Several coronary and neurovascular papers target in-stent restenosis and stent-related blooming artifacts, using ultra-high-resolution reconstructions to better classify obstructive vs non-obstructive disease and potentially reduce invasive angiography. In parallel, head and neck cancer work links PCCT-derived iodine metrics (e.g., normalized iodine concentration) to tumor biology markers, while preclinical simulation efforts build PCCT-specific digital/physics-informed tools to optimize contrast and reconstruction strategies. Outside oncology, liver-focused research uses segmental extracellular volume fraction from PCCT to predict early functional decline, suggesting a move toward imaging biomarkers that forecast disease trajectory.

Finally, the digest highlights how PCCT’s spatial resolution is enabling more precise musculoskeletal and spine applications. Studies address metal artifact reduction for post-surgical fusion assessment, quantitative joint and implant monitoring, and improved detection of rare CSF-venous fistulas/leaks using streamlined PCCT myelography workflows. Together with phantom and dose-focused evaluations (temporal bone, urogenital imaging, lung nodules), the overall trend is clear: PCCT is transitioning from “better images” to “actionable measurements”—whether for procedural planning, longitudinal outcome monitoring, or noninvasive characterization of disease aggressiveness.

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Photon-counting CT (PCCT/PCD-CT) technology & dose efficiency

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) 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 comparative studies. Scientifically and clinically, the results clarify whether PCD-CT can reduce dose and/or improve objective image quality in children, informing protocol selection and justification for pediatric PCCT adoption.

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

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

This narrative review summarized progress in CT radiation dose reduction over ~25 years and highlighted how photon-counting detector CT (PCD-CT) further improves dose efficiency. The key finding is that multiple innovations—such as added beam filtration, dynamic z-axis collimation, automatic tube current modulation, advanced iterative reconstruction, and deep learning-based reconstructions—culminated in PCD-CT advantages including electronic noise rejection, optimal photon-energy weighting, and high-resolution data acquisition. The clinical significance is that the review contextualizes how modern CT technologies, especially PCD-CT, can preserve diagnostic performance while pushing radiation dose lower.

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

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Spectral CT methods & quantitative material characterization (PCCT vs DECT)

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.

This phantom study compared spectral performance of three dual-energy CT (DECT) scanners (rapid kV-switching, ultrafast kV-switching, and dual-layer CT) against one photon-counting CT (PCCT) scanner using virtual monoenergetic images (40–70 keV) and iodine maps. Across low-energy VMIs and iodine mapping, the key finding was the relative differences in spectral accuracy/performance between DECT approaches and PCCT under matched abdominal/pelvic parameters and a reported volume CT dose index of 11 mGy. The scientific significance is that it clarifies how PCCT’s photon-counting spectral capabilities compare with DECT implementations for quantitative iodine-based material characterization.

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

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Coronary CT angiography & 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 the characterization of patient acceptance and emotional experiences during CCTA, including comparisons to patients with prior ICA experience. If PROs favor CCTA (including photon-counting CT), this could strengthen patient-centered justification for using noninvasive coronary imaging to exclude CAD.

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 clinical study compared first-generation photon-counting detector CT (PCD-CT) with third-generation energy-integrating detector CT (EID-CT) for detecting coronary artery disease in 205 asymptomatic Taiwanese individuals undergoing coronary CT angiography from a health check programme (103 EID-CT in July 2024 vs 102 PCD-CT in January 2025). The key finding was that PCD-CT was evaluated for safety and effectiveness relative to EID-CT for coronary artery disease detection in this real-world screening population. The significance is that it provides early clinical performance and safety evidence for first-generation PCD-CT in coronary CT angiography, informing whether PCCT can replace or augment current EID-CT in practice.

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

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Coronary in-stent restenosis (ISR) with UHR/PCCT

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

This two-center retrospective study assessed ultrahigh-resolution photon-counting detector CT (UHR PCD-CT) for detecting coronary in-stent restenosis (ISR) using invasive coronary angiography (ICA) as the reference standard. The key finding was the diagnostic performance of UHR PCD-CT reconstructions at 0.2 mm slice thickness (and a 0.4 mm slice thickness proxy) for classifying non-obstructive (<50%) versus obstructive (≥50%) ISR. If accurate, UHR PCD-CT could improve noninvasive ISR characterization and reduce reliance on invasive follow-up 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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Neurovascular imaging with PCCT angiography (stents/vascular mapping)

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 to determine whether photon-counting CT angiography (PCCT angiography) could define ductal anatomy non-invasively. Photon-counting CT angiography demonstrated a ductus connecting the descending thoracic aorta to the proximal left pulmonary artery, with multiplanar and 3D measurements of ductal diameter, length, and spatial relationships. The clinical significance is that PCCT may complement echocardiography when detailed anatomical assessment is required for ductus characterization and management planning.

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

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 in the spine. The key finding is that, leveraging photon-counting CT’s high spatial resolution, PCD-CTA is proposed as a method to better detect and localize the dominant arterial supply to the inferior anterior spinal artery. The scientific/clinical significance is improved pre-procedural vascular mapping for spinal cord ischemia risk mitigation and planning in relevant spine and aortic interventions.

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

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). UHR PCD-CTA was investigated as a way to overcome conventional CTA limitations from blooming artifacts and limited spatial resolution. If validated, UHR PCD-CTA could improve noninvasive ISR detection and reduce the need for invasive angiography in neurovascular follow-up.

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

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Spine imaging & CSF-venous fistula/CSF leak detection

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 photon-counting CT (PCCT) myelography protocol for detecting cerebrospinal fluid (CSF) venous fistulas in patients with spontaneous intracranial hypotension. The key finding was that in 35 patients with prior inconclusive spine imaging, PCCT myelography using fluoroscopy-guided contrast injection and entire-spine evaluation in a decubitus-to-scanner workflow enabled detection of CSF leaks/fistulas that were difficult to identify with energy-integrating CT myelography due to spatial resolution limits. Clinically, the protocol aims to improve diagnostic yield and operational efficiency in busy practice settings 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 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 decubitus myelography technique enabled detection of an exceptionally rare sacral CSF-venous fistula that can be difficult to identify. Clinically, the report provides a practical procedural adaptation to improve diagnostic yield for suspected CSF-venous fistulas presenting with spontaneous intracranial hypotension.

Kodet ML, Madhavan AA · Radiology case reports · (2026) · 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 with complete anatomic coverage and compared it with dose-matched photon-counting CT (PCCT) and energy-integrating CT (EICT). The key finding was the relative performance of the gantry-based CBCT against PCCT and EICT under matched protocols for spinal imaging quality/visualization (as assessed in the study). Scientifically and clinically, this informs whether advanced CBCT can expand spine imaging while maintaining image quality comparable to CT modalities.

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

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Musculoskeletal CT (arthritis, morphometry, implants, musculoskeletal disease)

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. The key finding was that osseointegration (bone ingrowth to the implant) increased across most implant zones over 12 months, while cortical thickness/density and zone-specific osteolysis were assessed longitudinally with PCD-CT. The clinical significance is that PCD-CT may provide improved quantitative assessment of implant-related bone changes to monitor outcomes 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 analysis assessed tin-filtered photon-counting CT (PCD-CT) combined with high-energy virtual monoenergetic imaging (VMI120) and iterative metal artifact reduction (iMAR) in patients after anterior cervical discectomy and fusion (ACDF). The study’s key focus was whether this PCD-CT protocol improves metal artifact reduction and image quality while enhancing assessment of intragraft and extragraft bone fusion compared with standard polychromatic imaging and artifact-reduction variants. Clinically, better post-ACDF fusion evaluation with reduced metal artifacts could support more accurate monitoring of surgical outcomes.

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

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 the relative performance of these approaches in generating JSW distributions, including how segmentation-based methods compare with deconvolution-based methods for joints beyond the metacarpophalangeal joints. Scientifically, this supports more sensitive and quantitative CT-based arthritis assessment than ordinal scoring and helps standardize 3D joint damage measurement.

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

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Musculoskeletal imaging technology evolution (perspectives/reviews)

Musculoskeletal Computed Tomography Imaging: A 30-Year Perspective.

This 30-year perspective reviewed how computed tomography (CT) has evolved for musculoskeletal imaging, including advances from helical CT to dose-efficient high-resolution systems and newer spectral CT methods. The key finding is that spectral CT, weight-bearing cone-beam CT, and CT arthrography expand CT beyond static bone assessment by enabling characterization of crystal deposits, marrow edema, and metal artifact reduction while improving functional joint evaluation. Clinically, this synthesis supports continued adoption and optimization of advanced CT modalities to improve diagnostic accuracy and reduce limitations of conventional CT in musculoskeletal disease.

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

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

This review article examined photon-counting computed tomography (PCCT) technology for musculoskeletal imaging, focusing on how photon-counting detectors differ from conventional energy-integrating CT detectors. It reports that PCCT’s direct-conversion, spectral imaging capability and electronic noise reduction can provide ultra-high spatial resolution and improved characterization of fractures, infections, inflammatory and degenerative arthropathies, and bone marrow disorders without increasing radiation exposure. The clinical significance is that PCCT may enhance diagnostic accuracy and tissue characterization across a wide range of musculoskeletal conditions.

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

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Renal cell carcinoma & renal mass characterization with spectral CT

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

This review evaluated the role of spectral CT—specifically dual-energy and photon-counting techniques—in renal cell carcinoma (RCC), focusing on improving characterization of incidentally detected renal masses. The key finding is that spectral CT can help distinguish cystic (proteinaceous/hemorrhagic) from solid lesions and may reduce the number of CT phases needed in renal CT/CT urography protocols, lowering radiation dose while maintaining diagnostic accuracy and cost-effectiveness. Scientifically, it supports protocol optimization and material-specific imaging strategies enabled by energy- and material-selective photon-counting/spectral CT for RCC workup.

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

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Liver disease biomarkers & liver function prediction

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 with photon-counting detector CT (PCD-CT) can predict early liver function decline in 146 patients with chronic liver disease, using modified albumin-bilirubin (mALBI) grade as the functional outcome. The key finding was that segmental fECV derived from iodine densities in Couinaud liver segments (S2–S8) and the aorta during 3-minute equilibrium-phase imaging had diagnostic accuracy for predicting early liver function decline. The clinical significance is that PCD-CT–based segmental fECV could serve as an early imaging biomarker to identify patients at risk of worsening liver function.

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

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Head & neck cancer imaging biomarkers & preclinical modeling

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 digital phantoms and tumor contrast distributions. Key steps included transferring high-resolution barium-enhanced vasculature from an energy-integrating detector micro-CT scan into the MOBY whole-body phantom and training a denoising diffusion probabilistic model (DDPM) on material-decomposed iodine- and barium-enhanced tumors to synthesize realistic PCCT tumor/contrast patterns fused with vascularized anatomy. This provides a data-driven, PCCT-specific tool to improve preclinical imaging study design and evaluation of contrast and reconstruction strategies for HNSCC in mice.

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 used contrast-enhanced photon-counting CT (PCCT) in 84 untreated patients with primary head and neck squamous cell carcinoma (HNSCC) to quantify tumor iodine concentration via iodine maps and normalized iodine concentration (NIC). The key finding was the association between NIC (tumor iodine concentration normalized to aortic iodine concentration) and histopathological features such as tumor stage/grade and proliferation marker Ki-67 (as reported in the abstract). If NIC reliably reflects tumor biology, PCCT-derived iodine metrics could become a noninvasive imaging biomarker for aggressiveness and prognosis 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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Urogenital CT (pelvis/perirenal) & artifact reduction

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 conventional energy-integrating CT (EIDCT) for lower pelvis and perirenal urogenital imaging in 35 patients. The key finding was whether PCCT reduces beam-hardening artifacts and/or improves image quality at the perirenal fat and urinary tract regions compared with EIDCT, using both quantitative and qualitative reader assessments. If PCCT consistently improves artifact and noise characteristics, it could enhance diagnostic precision 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 ↗

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Temporal bone CT & dose reduction

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 under clinically relevant reduced radiation dose conditions. The key finding was how PCCT performed relative to EICT in overall image quality and visualization of temporal bone anatomical landmarks across dose levels. This supports whether PCCT can maintain diagnostic landmark visibility while enabling dose reduction in temporal bone CT.

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

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Lung nodule volumetry & low-dose screening

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 photon-counting detector CT (PCD-CT) with energy-integrating detector CT (EID-CT) for lung nodule volumetric accuracy and precision under low-dose lung cancer screening protocols. The key finding was that PCD-CT improved volumetric accuracy for lung nodules and that reconstruction parameters (including slice thickness, matrix size, kernel, iterative reconstruction, and virtual monoenergetic imaging energy) could be optimized to further enhance nodule volumetry. Scientifically and clinically, the results support using PCD-CT with tailored reconstruction to improve quantitative lung nodule measurements in low-dose screening settings.

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

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Interventional guidance & thermal ablation monitoring with needle-tip sensing

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

The study evaluated a novel 125-µm acousto-optic sensor embedded in a 24-gauge needle stylet for real-time 3D needle tip tracking, internal ultrasound imaging from the tip, and thermal ablation monitoring under ultrasound guidance in phantom and bovine liver 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 assessed ablation margin detection and relative temperature estimation. This work is significant because it could improve ultrasound-guided biopsy and thermal ablation by enabling integrated needle visualization and ablation monitoring directly 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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Generated automatically on June 07, 2026. Covers PubMed articles published May 31, 2026 – June 07, 2026. Summaries are AI-generated; always consult the original publication for clinical or research decisions.