What's New in Photon Counting CT? — June 06, 2026
AI-summarised digest of 25 PubMed articles on Photon Counting CT published in the last 7 days.
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What’s New in Photon Counting CT?
June 06, 2026 · 25 articles · 15 research themes · covering May 30, 2026 – June 06, 2026
Overview
Across this week’s PubMed set, photon-counting CT (PCCT) is repeatedly positioned as a “step-change” technology: it improves spatial resolution and spectral/material discrimination while enabling dose efficiency through electronic noise reduction and reconstruction strategies. Multiple studies directly compare PCCT with energy-integrating CT (EID-CT) or other spectral platforms, showing benefits for artifact suppression (notably in challenging geometries like pelvis/perirenal urogenital imaging, postoperative cervical instrumentation, and temporal bone at reduced dose) and for quantitative imaging tasks (e.g., iodine mapping accuracy and low-dose lung nodule volumetry). Reviews further consolidate the clinical promise of PCCT and spectral CT for musculoskeletal diagnosis and for the broader historical trajectory of CT dose reduction.
A second dominant theme is quantitative biomarker development using PCCT’s spectral capabilities. In chronic liver disease, segmental extracellular volume fraction derived from iodine densities is explored as an imaging predictor of early functional decline. In head and neck squamous cell carcinoma, normalized iodine concentration is linked to histopathologic aggressiveness markers such as stage/grade and Ki-67, suggesting a pathway toward imaging-based risk stratification. In renal cell carcinoma, spectral CT is reviewed as a way to better separate cystic and solid lesions and potentially streamline multiphase CT urography/renal protocols to reduce radiation.
Finally, the clinical translation of PCCT into specialized workflows—cardiac, neurovascular/spine, and interventional—stands out. Coronary studies evaluate first-generation PCCT for screening and UHR PCCT for in-stent restenosis detection, while a patient-reported outcomes study addresses acceptability versus invasive angiography. In neurovascular and spine imaging, ultra-high-resolution PCCT angiography is explored for in-stent restenosis and for mapping critical spinal blood supply (artery of Adamkiewicz), alongside streamlined PCCT myelography protocols to improve detection/localization of CSF leaks and CSF-venous fistulas. Complementing these, an interventional engineering study demonstrates an acousto-optic needle-tip sensor integrated into a needle stylet for simultaneous tracking, internal ultrasound imaging, and thermal ablation monitoring—highlighting how imaging innovation is moving toward real-time, procedure-integrated guidance.
Photon-counting CT (PCCT) hardware, reconstruction, and dose/quality performance
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 innovations and the added impact of photon-counting detector CT. The key finding is that dose efficiency improved through electronic noise rejection, optimal photon-energy weighting, and high-resolution data acquisition enabled by photon-counting technology, building on earlier advances such as automatic tube current modulation, dynamic collimation, advanced iterative reconstruction, and deep learning-based reconstructions. Scientifically and clinically, it frames how cumulative hardware and reconstruction innovations have reduced patient dose while preserving diagnostic performance.
McCollough CH, Yu L · AJR. American journal of roentgenology · (2026) · 2 citations · View on PubMed ↗ · Free PDF ↗
Spectral CT and quantitative material imaging (DECT/PCCT iodine/VMIs)
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 of 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 for virtual monoenergetic images (VMIs) at 40–70 keV and for iodine maps. Using a spectral phantom scanned at abdominal/pelvic parameters with a volume CT dose index of 11 mGy, the key outcome was how each system’s reconstruction affected low-energy VMI quality and iodine-map spectral accuracy. This head-to-head phantom comparison informs which CT platform best supports quantitative spectral imaging tasks such as iodine-based lesion characterization.
Greffier J, Salvat C, Pastor M et al. · Diagnostic and interventional imaging · (2026) · 4 citations · View on PubMed ↗ · Free PDF ↗
Cardiac CT angiography (coronary disease, stents, and patient experience)
Photon-counting CT angiography for anatomical assessment of patent ductus arteriosus in a child.
This case report evaluated photon-counting CT angiography in a 10-year-old girl with patent ductus arteriosus (PDA) requiring noninvasive anatomical definition. Photon-counting CT angiography demonstrated a ductus connecting the descending thoracic aorta and the proximal left pulmonary artery, with multiplanar and 3D imaging used to define ductal diameter, length, and spatial relationships. The clinical significance is that PCCT angiography may complement echocardiography when detailed PDA anatomy is needed for management planning.
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 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 of the heart. The key finding was characterization of patient acceptance and emotional experiences during CCTA, including comparisons to prior ICA experience. Clinically, understanding PROs can guide patient-centered selection and counseling when CCTA is used as a noninvasive alternative to ICA.
von der Stück MS, Siepmann R, Corban E et al. · European journal of radiology open · (2026) · View on PubMed ↗ · Free PDF ↗
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 consecutive patients with coronary stents, using invasive coronary angiography (ICA) as the reference standard. The key finding was the performance of UHR PCD-CT reconstructions at 0.2 mm slice thickness (and a 0.4 mm slice thickness proxy) for detecting non-obstructive (<50%) and obstructive (≥50%) ISR. If accuracy is high, UHR PCD-CT could improve noninvasive ISR detection and reduce the need for repeat invasive angiography.
Szilveszter B, Hagar MT, Kulyassa P et al. · European journal of radiology · (2026) · 1 citations · View on PubMed ↗ · Free PDF ↗
Initial clinical evaluation of photon-counting detector computed tomography for coronary artery disease in Taiwan.
In a retrospective single-center study in Taiwan, 205 asymptomatic individuals undergoing coronary CT angiography from a health check program 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 detection of coronary artery disease. The study aimed to evaluate safety and effectiveness of the first-generation PCD-CT relative to EID-CT, leveraging PCD-CT’s expected improvements in dose efficiency, image resolution, and noise performance. If confirmed, these findings would support clinical adoption of first-generation PCD-CT for coronary artery disease screening with potentially better image quality and dose efficiency.
Lu YW, Wang KL, Wang YW et al. · Coronary artery disease · (2026) · View on PubMed ↗
Neurovascular and spine vascular imaging (stents, Adamkiewicz, CSF-venous fistulas)
Photon-Counting Detector CTA for Localization of the Artery of Adamkiewicz.
This article described the potential of photon-counting detector CT angiography (CTA) for localizing the artery of Adamkiewicz, the dominant feeder to the inferior anterior spinal artery. The key finding is that PCCT’s high spatial resolution and related advantages are positioned to improve spine vascular assessment, extending neuroradiology applications beyond established uses such as temporal bone imaging and CSF leak detection. Scientifically, it supports further development of PCCT-CTA protocols to enhance 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 ↗
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 neurovascular stents implanted at The First Affiliated Hospital of Nanjing Medical University (July–November 2025) for noninvasive detection of neurovascular in-stent restenosis (ISR). UHR PCD-CTA was investigated as an approach to overcome conventional CTA limitations by reducing blooming artifacts and improving spatial resolution for more accurate ISR detection. If validated, UHR PCD-CTA could improve noninvasive surveillance of neurovascular stents and reduce reliance on invasive angiography for ISR assessment.
Su CQ, Zhou C, Wu PF et al. · Stroke · (2026) · View on PubMed ↗
CT myelography and CSF leak/fistula detection
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 cerebrospinal fluid (CSF) venous fistulas/CSF leaks in patients with spontaneous intracranial hypotension. In 35 patients with prior inconclusive spine imaging, PCCT myelography using fluoroscopy-guided contrast injection and entire-spine evaluation in decubitus positioning was used to improve detection in busy practice settings. The clinical significance is that PCCT can overcome energy-integrating CT myelography’s spatial-resolution limitations, enabling more reliable localization of CSF leaks in routine workflows.
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 rare case report described diagnosis of a sacral CSF-venous fistula (right S2) using single-day bilateral decubitus myelography with a novel technical modification. The key finding was that the modified decubitus myelographic technique enabled detection of an exceptionally challenging sacral fistula that is often difficult to localize. Scientifically and clinically, it provides a practical procedural template for improving diagnostic yield in suspected CSF-venous fistulas presenting with spontaneous intracranial hypotension.
Kodet ML, Madhavan AA · Radiology case reports · (2026) · View on PubMed ↗ · Free PDF ↗
Oncology imaging with spectral/PCCT biomarkers (HNSCC, RCC, preclinical 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 vascular anatomy from a barium-enhanced energy-integrating detector micro-CT scan and tumor contrast distributions derived from prior photon-counting CT data. Key steps included transferring vasculature into the MOBY whole-body digital phantom via affine warps and training a denoising diffusion probabilistic model (DDPM) to synthesize iodine- and barium-enhanced tumors fused with the vascularized phantom. This provides a data-driven, PCCT-specific tool to improve preclinical imaging research and optimize contrast/scan design for HNSCC studies in mice.
Nadkarni R, Clark DP, Allphin AJ et al. · Physics in medicine and biology · (2026) · View on PubMed ↗
Spectral CT in renal cell carcinoma: the promising role of dual-energy and photon-counting techniques.
This review assessed the role of spectral CT—specifically dual-energy and photon-counting techniques—in renal cell carcinoma (RCC), focusing on differentiating cystic versus solid renal masses and optimizing CT urography/renal CT protocols. The key finding is that spectral CT can enable energy- and material-specific characterization that may reduce the number of phases required, lowering radiation dose while maintaining diagnostic accuracy and cost-effectiveness. Clinically, this supports more efficient RCC imaging workflows and improved lesion characterization when only limited-phase CT is available.
Kekelidze M, García-Figueiras R, Kolmos M et al. · Abdominal radiology (New York) · (2026) · View on PubMed ↗
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) in 84 untreated primary head and neck squamous cell carcinoma (HNSCC) patients is associated with histopathological features. The key finding was the relationship between intratumoral iodine concentration (from iodine maps) and tumor biology markers such as tumor stage/grade and proliferation (including Ki-67), indicating that PCCT-derived iodine metrics reflect underlying pathology. Scientifically and clinically, NIC could support quantitative imaging biomarkers for HNSCC aggressiveness and potentially aid risk stratification and treatment planning.
Surov A, Diallo-Danebrock R, Sonnemann H et al. · Journal of cancer research and clinical oncology · (2026) · View on PubMed ↗ · Free PDF ↗
Musculoskeletal CT applications (arthritis, morphometry, arthroplasty, musculoskeletal imaging evolution)
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 high-resolution, dose-efficient systems and newer spectral CT approaches. The key finding is that spectral CT, weight-bearing cone-beam CT, and CT arthrography expand CT beyond static bone assessment by enabling material characterization (e.g., crystal deposits), marrow evaluation, and improved metal artifact handling. Clinically, these developments support more accurate diagnosis and procedural planning while addressing dose and image-quality limitations over decades of technology change.
Omoumi P, Pastor M, Demehri S et al. · Seminars in musculoskeletal radiology · (2026) · View on PubMed ↗
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 evaluated zones over 12 months, while cortical thickness/density and zone-based osteolysis assessments were used to characterize periprosthetic bone changes over time. 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 ↗
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 in order to determine which approach better characterizes radiographic joint damage. The key finding was the comparative performance of JSW distribution metrics derived from segmentation-based methods versus deconvolution-based methods across hand/wrist joints, addressing a gap where segmentation-based approaches had not been widely applied beyond metacarpophalangeal joints. If robust, the results support more sensitive and quantitative CT-based monitoring of arthritis progression than traditional ordinal scoring.
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 the current clinical and technical applications of photon-counting CT (PCCT) in musculoskeletal imaging, focusing on photon-counting detector (direct-conversion) versus energy-integrating CT detectors. It reports that PCCT enables ultra-high spatial resolution, systematic spectral imaging, and electronic noise reduction without increasing radiation exposure, with potential benefits for detecting and characterizing fractures, infections, inflammatory and degenerative arthropathies, and bone marrow disorders. The review supports PCCT as a promising next-generation CT approach to improve 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 ↗
Liver disease imaging biomarkers (fECV, liver function decline)
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 study calculated fECV from iodine densities in the aorta and Couinaud segments S2–S8 and assessed diagnostic accuracy for predicting early decline. If validated, segmental fECV from PCD-CT could provide an imaging biomarker for earlier risk stratification of liver function deterioration in CLD.
Ohtani T, Shimada M, Takahashi K et al. · Abdominal radiology (New York) · (2026) · View on PubMed ↗ · Free PDF ↗
Urogenital CT imaging (artifact reduction and diagnostic performance)
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 urogenital imaging in 35 patients who underwent both scan types. The key finding was that PCCT reduced beam-hardening artifacts and/or improved image quality in the lower pelvis and perirenal region compared with EIDCT, as assessed by radiologists using subjective and quantitative measures. Clinically, improved artifact control in perirenal and pelvic imaging could enhance diagnostic accuracy and confidence in urogenital CT interpretation.
Brandt EGS, Müller FC, Nielsen YJ et al. · Acta radiologica (Stockholm, Sweden : 1987) · (2026) · View on PubMed ↗
Temporal bone CT imaging
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. The key finding was how PCCT performed relative to EICT in terms of image quality and visualization of anatomical landmarks under dose reduction. If PCCT maintains or improves landmark visibility at lower dose, it could enable safer temporal bone CT protocols while preserving diagnostic performance.
Pellby D, Vestin-Fredriksson M, Rönnblom A et al. · Acta radiologica (Stockholm, Sweden : 1987) · (2026) · View on PubMed ↗
Lung cancer screening and quantitative nodule assessment
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 at low dose and that reconstruction parameters (e.g., 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 reconstructions to improve quantitative nodule tracking in low-dose screening settings.
Hop JF, Greuter MJW, van Dijk M et al. · Investigative radiology · (2026) · View on PubMed ↗ · Free PDF ↗
Postoperative spine imaging and metal artifact reduction (fusion assessment)
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 detector 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) (2023–2026). The key finding was that the PCD-CT/VMI120/iMAR approach improved metal artifact reduction and image quality and influenced the assessment of intragraft and extragraft bone fusion compared with standard polychromatic imaging and artifact-reduction variants. Clinically, this could make postoperative fusion evaluation more reliable in the presence of cervical instrumentation by leveraging photon-counting CT’s artifact-suppression capabilities.
Abel F, Curti M, Marth T et al. · Investigative radiology · (2026) · View on PubMed ↗ · Free PDF ↗
Thermal ablation and image-guided interventions (needle tracking/monitoring)
Novel Acousto-Optic Sensor for Needle Tip Tracking and Internal Ultrasound Imaging from the Tip for Biopsy and Thermal Ablation.
A novel 125-micron acousto-optic sensor embedded in a 24-gauge needle stylet was evaluated 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 ex vivo models. Bench testing showed accurate in-plane needle localization relative to the ultrasound imaging plane with CT-validated performance, and ex vivo work demonstrated the ability to detect ablation margins and estimate relative temperature during water-bath ablation experiments. This technology could improve image-guided biopsy and thermal ablation by enabling simultaneous needle tracking, internal 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 ↗
Pediatric CT with PCCT vs EIDCT (dose and image quality)
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 volume CT dose index (CTDI) and objective image quality/contrast outcomes 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 pediatric protocol selection.
Altintas Mese C, Mese I · Pediatric radiology · (2026) · View on PubMed ↗
Virtual/advanced CT platforms and emerging imaging systems (CBCT, simulation)
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) using an anthropomorphic torso phantom. The key finding was the relative performance of gantry-based CBCT versus PCCT and EICT under matched protocols for spinal imaging quality and coverage. Scientifically, it informs how emerging CBCT hardware stacks up against photon-counting CT for comprehensive spine assessment while controlling radiation dose.
Bach U, Cester D, Kroschke J et al. · European journal of radiology · (2026) · 1 citations · View on PubMed ↗ · Free PDF ↗
Generated automatically on June 06, 2026. Covers PubMed articles published May 30, 2026 – June 06, 2026. Summaries are AI-generated; always consult the original publication for clinical or research decisions.