What's New in Photon Counting CT? — October 07, 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?
October 07, 2026 · 25 articles · 15 research themes · covering September 30, 2026 – October 07, 2026
Overview
Across this week’s PubMed set, photon-counting CT (PCD/PCCT/SPCCT) is repeatedly shown to deliver a favorable dose–image-quality tradeoff versus energy-integrating CT (EID-CT), with multiple studies targeting real clinical pain points: repeated multi-phase imaging (e.g., 4D parathyroid), complex anatomy (temporal bone, trauma vasculature), and high-attenuation/metal scenarios (spinal instrumentation). Several works emphasize that the benefits are not automatic—optimal reconstruction choices (kernels, sharpness, and spectral settings) and correct patient positioning (e.g., off-centering effects) materially affect noise, contrast, and diagnostic performance.
A second dominant theme is the move from “better images” toward “better measurements.” Virtual monoenergetic/virtual non-contrast strategies (e.g., 190 keV VMI as a surrogate for true non-contrast in hepatic steatosis) and energy-aware quantitative protocols (e.g., bone marrow attenuation in multiple myeloma) illustrate how spectral reconstructions can replace or reduce additional acquisitions. Complementing this, methodological advances such as deriving effective physical density (ρeff) from clinical photon-counting data point to broader quantitative material characterization beyond conventional Hounsfield units.
Finally, the dataset highlights clinical translation pathways: (1) oncology workflows where spectral reconstructions and reconstruction parameters influence detectability of metastases and residual viable tumor after therapy, and (2) cardiovascular applications where CCTA plaque characterization and CT-derived physiology (including FFR-CT concepts and CAC opportunistic screening) are increasingly framed as decision-support tools rather than stenosis-only tests. Machine-learning/radiomics using PCD-CT spectral features further supports a trend toward automated, noninvasive lesion classification and risk stratification using the richer spectral information unique to photon-counting systems.
Photon-Counting CT vs Energy-Integrating CT (dose–quality comparisons)
Photon-counting detector computed tomography (PCD-CT) in multiple myeloma: a systematic review and trial sequential meta-analysis on image quality and radiation dose.
This systematic review and trial sequential meta-analysis compared photon-counting detector CT (PCD-CT) versus energy-integrating detector CT (EID-CT) for image quality (sharpness) and radiation dose (CTDIvol) in patients with bone lesions from multiple myeloma, using studies published through October 2025 (5 included studies, n=170). Across included evidence, PCD-CT was evaluated for its ability to maintain or improve image quality while potentially reducing radiation dose relative to EID-CT. Clinically, the synthesis supports evidence-based selection of PCD-CT for multiple myeloma imaging, while highlighting the need for more comparative trials to confirm dose–quality benefits.
Ohannesian VA, Taneja BC, do Amaral E Castro A et al. · Skeletal radiology · (2026) · View on PubMed ↗
Photon-Counting Detector vs Energy-Integrating Detector CT Myelography for Detecting CSF-Venous Fistulas in Spontaneous Intracranial Hypotension: Substantially Lower Radiation Dose.
This retrospective single-center cohort study compared radiation dose between photon-counting detector CT myelography (PCD-CTM) and energy-integrating detector CT myelography (EID-CTM) for detecting CSF-venous fistulas in 603 examinations for spontaneous intracranial hypotension (SIH). The primary endpoint was session dose-length product (DLP) across the entire CTM examination, with secondary dose/quality metrics reported to assess tradeoffs. The results support PCD-CTM as a substantially lower-dose alternative for SIH workup when detecting CSF-venous fistulas.
Christensen S, Kranz PG, Malinzak MD et al. · AJNR. American journal of neuroradiology · (2026) · 1 citations · View on PubMed ↗ · Free PDF ↗
Quantitative Evaluation of Image Quality Improvement and Reduced Radiation Output with Photon-Counting CT in 4D Parathyroid Imaging.
This quantitative study compared photon-counting CT (PCCT) with energy-integrating detector CT (EIDCT) for 4D parathyroid imaging, focusing on radiation output (CTDIvol and DLP) and image quality (SNR and contrast-to-noise ratio). The key finding was that PCCT can improve dose efficiency while maintaining or enhancing image quality in the multi-phase, anatomically complex neck imaging workflow of 4DCT. This is clinically significant because it addresses the radiation burden of repeated acquisitions in parathyroid localization while preserving diagnostic performance.
Arizono E, Buch K, Kelly HR et al. · AJNR. American journal of neuroradiology · (2026) · View on PubMed ↗ · Free PDF ↗
Impact of Vertical Off-centering on Radiation Dose and Image Noise in Photon-counting Computed Tomography: A Phantom Study.
This phantom study evaluated how vertical off-centering affects radiation dose and image noise in photon-counting CT (PCCT) across adult and pediatric body sizes using three anthropomorphic phantoms (adult male, 10-year-old, 5-year-old) scanned on a commercial PCCT system at multiple vertical offsets. The key finding was that vertical off-centering measurably changed both dose and image noise, with the magnitude depending on phantom size. Scientifically and clinically, the results inform patient positioning protocols for PCCT to optimize dose efficiency and image quality, especially in pediatric imaging where off-centering may be more consequential.
Klüner LV, Haubold J, Peuster H et al. · Investigative radiology · (2026) · 2 citations · View on PubMed ↗
Metal Artifact Reduction & Spectral Imaging for Hardware
Metal Artifact Reduction in Lumbar Spine Instrumentation: A Comparison of Photon-Counting Detector-Computed Tomography Versus Energy-Integrating Detector-Computed Tomography, Iterative Metal Artifact Reduction, and Virtual Monoenergetic Imaging in 100 Examinations.
This retrospective study compared photon-counting detector CT (PCD-CT) with tin filtration (Sn) and iterative metal artifact reduction (iMAR) plus virtual monoenergetic imaging (VMI) against energy-integrating detector CT (EID-CT) in 100 post–lumbar fusion examinations (50 EID, 50 PCD). The key finding was that PCD-CT with VMI/iMAR provided improved qualitative and quantitative performance for reducing metal artifacts from lumbar spine instrumentation compared with EID-CT approaches. Clinically, this supports using PCD-CT spectral reconstructions to enhance visualization around spinal hardware, potentially improving assessment of postoperative pathology despite metal-related degradation.
Marth T, Marth AA, Abel F et al. · Investigative radiology · (2026) · 2 citations · View on PubMed ↗
Reconstruction Parameter Optimization (kernels, sharpness, kernels/settings)
Photon-counting detector CT for follow-up after TACE in hepatocellular carcinoma: effects of reconstruction kernel and sharpness.
This retrospective study assessed how photon-counting detector CT (PCD-CT) reconstruction kernel type (body regular [Br] vs quantitative regular [Qr]) and sharpness levels (36–48) affect residual viable tumor conspicuity after transarterial chemoembolization (TACE) in 72 hepatocellular carcinoma (HCC) patients. The key finding was that reconstruction kernel and sharpness significantly influenced image noise and signal-to-noise characteristics, thereby changing the conspicuity/assessability of residual viable tumor. Clinically, selecting optimal PCD-CT reconstruction parameters may improve follow-up interpretation after TACE and potentially reduce missed residual disease.
Yuan M, Wang D, Shi Z et al. · Abdominal radiology (New York) · (2026) · View on PubMed ↗ · Free PDF ↗
Optimization of spectral photon-counting CT reconstruction parameters for improved detection of peritoneal metastases compared with energy-integrating detector dual-energy CT: a phantom study.
In this phantom study, spectral photon-counting CT (SPCCT) reconstruction parameters were optimized to improve detection of peritoneal metastases on 40 keV virtual monoenergetic images (VMIs) and compared against energy-integrating detector dual-energy CT (EID-DECT). The key finding was that specific SPCCT kernel and iDose4 settings (evaluated using noise power spectrum/transfer function and detectability indices d′ for non-mucinous and mucinous metastases) outperformed the EID-DECT reference for peritoneal metastasis detectability at the tested dose level. This is significant because it provides actionable reconstruction parameter guidance for SPCCT to enhance metastatic detection in abdominal oncology imaging.
Greffier J, Grange R, Dabli D et al. · European radiology experimental · (2026) · View on PubMed ↗ · Free PDF ↗
Virtual Monoenergetic / Virtual Non-Contrast Surrogates
Single-Phase Surrogate for True Non-Contrast Liver CT Using 190-keV Monoenergetic Imaging on Photon-Counting CT: Implications for Hepatic Steatosis Assessment.
This retrospective study tested whether 190-keV virtual monoenergetic imaging (VMI) derived from photon-counting detector CT (PCD-CT) can act as a surrogate for true non-contrast (TNC) CT in hepatic steatosis quantification in 49 patients with abdominal PCD-CT and MRI-proton density fat fraction (PDFF) within 2 months. The key finding was that 190-keV VMI showed attenuation agreement with TNC (and was compared against virtual non-contrast [VNC]) using correlation and Bland–Altman analyses across liver segments. This is significant because it could enable steatosis assessment without acquiring a separate true non-contrast scan, reducing radiation and simplifying protocols.
Ohtani T, Shimada M, Nishiyama K et al. · Academic radiology · (2026) · View on PubMed ↗ · Free PDF ↗
Temporal Bone Imaging (ultra-high-resolution, dose efficiency)
Photon-counting detector computed tomography for temporal bone: does higher resolution matter?
This narrative review summarized emerging evidence on photon-counting detector CT (PCD-CT) for temporal bone imaging and specifically addressed whether higher spatial resolution translates into meaningful clinical decision-making. The key finding across the reviewed literature was that PCD-CT’s improved resolution/noise characteristics are promising for submillimeter temporal bone structures, but the clinical impact depends on lesion type and diagnostic task. Scientifically, it frames where PCD-CT resolution benefits are likely to matter most and where evidence is still limited for routine adoption.
Epperson MV, Leng S, Lane JI et al. · Current opinion in otolaryngology & head and neck surgery · (2026) · View on PubMed ↗ · Free PDF ↗
Low-dose ultra-high-resolution temporal bone imaging using Sn100 kVp photon-counting CT: A comparative study with conventional CT.
This prospective comparative study evaluated low-dose ultra-high-resolution temporal bone imaging using Sn100 kVp photon-counting CT (PCD-CT) versus conventional energy-integrating detector CT (EID-CT) in patients with suspected or confirmed temporal bone lesions. The key finding was that PCD-CT reconstructed at 0.2 mm and 0.6 mm slice thicknesses could achieve improved image quality/diagnostic performance while reducing radiation dose compared with EID-CT at 120 kVp. This is significant because it supports dose-efficient, high-detail temporal bone imaging using photon-counting technology.
Tong J, Tian X, Huang Y et al. · European journal of radiology · (2026) · View on PubMed ↗
Quantitative Body Composition & Metabolic Risk (PCCT phenotyping)
A Prediction Model for Metabolic Abnormality Clustering Based on Abdominal Body Composition Parameters From Photon-counting CT: Development and Internal Validation.
This retrospective study of 116 patients undergoing abdominal photon-counting CT (PCCT) (61 with metabolic abnormality clustering and 55 without) developed and internally validated prediction models linking PCCT-derived abdominal body composition parameters to metabolic abnormality clustering. The key finding was that PCCT-based body composition metrics were associated with metabolic abnormality clustering and improved risk prediction in clinical, imaging, and combined model frameworks. This is significant because it suggests PCCT-derived phenotyping could enable earlier, imaging-informed identification of patients at risk for clustered metabolic disorders.
Zhang Y, Weng S, Liu Y et al. · Academic radiology · (2026) · View on PubMed ↗
Oncology Detection & Response Assessment (liver, peritoneum, prostate, HCC)
Optimizing photon counting detector CT reconstructions for automatic vessel tracing in prostate artery embolization.
This study evaluated photon-counting detector CT (PCD-CT) reconstruction settings in 10 patients undergoing prostate artery embolization (PAE) planning to optimize automatic vessel tracing of prostate arteries. Among four reconstruction approaches, the authors identified the reconstruction that produced the most robust and consistent automatic vessel tracing within the PCD-CT workflow. This supports more reliable, procedure-planning vessel navigation for PAE by improving the technical inputs to automated vascular segmentation/tracing.
Froelich T, Linch FB, Thompson SM et al. · Journal of applied clinical medical physics · (2026) · View on PubMed ↗
Machine Learning / Radiomics with PCD-CT Spectral Data
Photon-counting Detector CT Spectral Reconstructions for Radiomics-based Liver Lesion Classification: A Multicenter Study.
This multicenter study evaluated radiomics-based machine learning for classifying benign versus malignant focal liver lesions using photon-counting detector CT (PCD-CT) spectral reconstructions in patients scanned at two institutions. Lesions were automatically segmented with a nnU-Net model, and multispectral virtual monochromatic images and material decomposition outputs were used as inputs to the classification pipeline. The study supports the use of PCD-CT spectral radiomics to improve noninvasive liver lesion characterization beyond conventional CT.
Pietsch FL, Vellala AK, Haag F et al. · Investigative radiology · (2026) · 1 citations · View on PubMed ↗
Coronary CT Angiography & Plaque/Physiology (CCTA, ACS, FFR-CT, CAC)
Photon-counting CT of midventricular takotsubo cardiomyopathy.
This radiology case report describes a 63-year-old woman with midventricular takotsubo cardiomyopathy presenting with acute chest pain and elevated cardiac troponin I after emotional stress, evaluated using photon-counting detector coronary CT angiography (PCD-CCTA). The key finding was that multiphase PCD-CCTA excluded obstructive coronary artery disease and more definitively characterized the midventricular wall-motion abnormality pattern (midventricular hypokinesia with basal and apical sparing). The clinical significance is that PCD-CCTA can provide a high-resolution, single-session assessment that supports accurate diagnosis of atypical takotsubo variants.
Chikh Bakri I, Euler A · Radiology case reports · (2026) · View on PubMed ↗ · Free PDF ↗
Diagnostic and prognostic value of coronary computed tomography angiography and high-risk plaque assessment in acute coronary syndrome.
This review article evaluated the diagnostic and prognostic value of coronary computed tomography angiography (CCTA) and high-risk plaque assessment in patients with acute coronary syndrome (ACS). The key finding was that, beyond detecting coronary stenosis, CCTA-derived plaque characterization (including high-risk plaque features) and assessment of non-coronary causes can improve risk stratification and may influence selection for invasive coronary angiography. Clinically, it supports the growing role of CCTA as a comprehensive noninvasive tool for both diagnosis and prognosis in ACS.
Miceli AL, Iroulart JM, Domenech P et al. · Current problems in cardiology · (2026) · View on PubMed ↗
Advanced quantitative CT for coronary artery disease: integrating stenosis quantification, plaque quantification, and fractional flow reserve-CT.
This 2026 review studied advanced quantitative CT approaches for coronary artery disease, focusing on integrating stenosis quantification, plaque quantification, and fractional flow reserve derived from CT (FFR-CT) and discussing emerging AI-based quantitative workflows. The key finding is that combining anatomical plaque biomarkers with AI-driven stenosis quantification and CT-derived physiology can improve reproducibility and risk stratification beyond stenosis-only assessment. Scientifically and clinically, this supports a shift from purely morphological CCTA interpretation toward quantitative, physiology-informed decision support for major adverse cardiovascular event prediction.
Mihalcioiu S, Mengesha B, Abitbol C et al. · The British journal of radiology · (2026) · View on PubMed ↗ · Free PDF ↗
Coronary artery calcium score-emerging role for opportunistic screening on thoracic CT and novel applications.
This 2026 review evaluated the emerging role of coronary artery calcium (CAC) scoring for opportunistic screening on existing thoracic CT scans and discussed novel applications enabled by AI/ML. The key finding is that detecting CAC on non-cardiac thoracic CT (e.g., lung cancer screening, routine thoracic CT, and attenuation-correction CT) can identify patients at higher cardiovascular risk who may benefit from preventive therapies, despite the lack of randomized outcome trials. Scientifically, it frames how AI/ML may standardize CAC detection and expand clinical utility within current imaging workflows.
Patel R, Williams MC · The British journal of radiology · (2026) · View on PubMed ↗ · Free PDF ↗
[Coronary CT angiography: Diagnosis, prognosis and PCI planning].
This narrative review summarized how coronary CT angiography (CCTA) is used for diagnosis, prognosis, and percutaneous coronary intervention (PCI) planning in coronary artery disease management. The key finding was that CCTA’s prognostic value is driven more by overall atherosclerotic burden and plaque morphology (e.g., high-risk plaque and pericoronary fat) than by stenosis severity alone, leading to updates such as revisions to CAD-RADS classification. Clinically, it supports using CCTA not only to rule in/out disease but also to stratify risk and guide PCI planning using CT-derived functional measures like fractional flow reserve.
Delapierre A, Tonnerre G, Mokrane FZ et al. · Annales de cardiologie et d’angeiologie · (2026) · View on PubMed ↗
CT-Guided Cardiac/Coronary Interventions (PCI planning/extension)
CT-guided PCI: From diagnosis to treatment planning.
This 2026 review studied computed tomography-guided percutaneous coronary intervention (CT-guided PCI) as an extension of coronary CT angiography (CCTA) from diagnosis to procedural planning. The key finding is that integrating morphological and physiological information from CCTA—supported by advances in myocardial mass quantification, CT-derived physiology, and 3D co-registration—can enable more individualized revascularization planning before PCI. Clinically, it positions photon-counting CT as a future technology to further refine accuracy and broaden CT-guided PCI applicability.
Ohashi H, Tajima A, Sakai K et al. · Journal of cardiology · (2026) · View on PubMed ↗ · Free PDF ↗
Airway Imaging & Dynamics (pediatric/adaptive monitoring)
Advanced Imaging to Assess Airway Dynamics.
This narrative review examined imaging approaches for assessing airway dynamics in pediatric patients, contrasting endoscopy with noninvasive imaging modalities including 4D CT and photon-counting CT, and also discussing MRI-based dynamic techniques. The key finding is that 4D CT enables objective quantification of tracheal collapse during free breathing, while photon-counting CT can reduce effective dose toward chest radiography levels, enabling safer serial monitoring. These advances are significant for improving objective diagnosis and longitudinal management of dynamic airway disorders while minimizing radiation exposure.
Bates AJ, Fleck RJ, Smith DF · Otolaryngologic clinics of North America · (2026) · View on PubMed ↗
Vascular Imaging & Contrast Optimization (trauma, lower extremities)
Impact of virtual monoenergetic images on the assessability of lower extremity arteries in (Poly-) trauma photon-counting detector CT.
This study investigated how virtual monoenergetic (VME) images derived from photon-counting detector CT (PCD-CT) affect the assessability of lower extremity arteries in (poly-)trauma patients using a double-bolus contrast protocol. The key finding was that only certain VME energy levels produced sufficient vascular contrast (defined as >200 Hounsfield Units) for reliable evaluation of lower extremity arteries. Clinically, identifying VME settings that preserve arterial contrast can improve vascular diagnostic accuracy in extended trauma CT examinations.
Dillinger D, Bauer C, Kaatsch HL et al. · Emergency radiology · (2026) · View on PubMed ↗ · Free PDF ↗
Quantitative Material Characterization (effective density, Zeff/ρeff)
An algorithm to calculate physical density of biomedical objects having 3 ≤ Zeff ≤ 20: an application study using clinical photon-counting computed tomography equipment.
This methodological study proposed an algorithm to calculate effective physical density (ρeff) of biomedical objects with effective atomic number (Zeff) between 3 and 20 using clinical photon-counting CT equipment. The key finding was that ρeff could be derived by fitting interaction cross sections to measured linear attenuation coefficients obtained from virtual monochromatic images (VMIs), with Zeff used as feedback to improve the analysis. This is significant because it advances quantitative material/biophysical characterization from photon-counting CT beyond conventional Hounsfield unit–based approaches.
Hayashi H, Nishigami R, Asahara T et al. · Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine · (2026) · 3 citations · View on PubMed ↗ · Free PDF ↗
Orthopedic/Prosthesis & Bone Lesion Imaging (myeloma, arthroplasty, marrow, integration)
Computed tomography of three smaller-sized supraglottic airway device prototypes in stillborn low-birth-weight neonates.
This study used photon-counting CT to evaluate three smaller supraglottic airway device prototypes (Neo i-gel sizes 0.65, 0.75, 0.85) plus the smallest commercial i-gel size 1.0 in stillborn low-birth-weight neonates weighing >500 g. The key finding was that photon-counting CT enabled anatomical positioning assessment relative to perilaryngeal landmarks and characterization of how device placement affected adjacent structures across the tested sizes. Scientifically and clinically, this informs selection and design of neonatal airway devices by providing high-resolution, quantitative placement verification in very small patients.
Dempsey T, Brismar TB, Svensson-Marcial A et al. · British journal of anaesthesia · (2026) · View on PubMed ↗ · Free PDF ↗
Energy-resolved attenuation behaviour on dual-source photon-counting CT: Implications for quantitative assessment of femoral bone marrow in multiple myeloma.
This retrospective single-centre study evaluated energy-dependent attenuation of femoral bone marrow in 103 patients with multiple myeloma undergoing unenhanced ultra-high-resolution dual-source photon-counting detector CT (PCD-CT), using virtual monoenergetic images reconstructed at 40–190 keV. Bone marrow attenuation showed photon-energy dependence that affected threshold-based quantitative differentiation between physiological tissue and myeloma infiltration. These findings support energy-aware quantitative PCD-CT protocols to improve the accuracy of marrow infiltration assessment in multiple myeloma.
Heidemeier A, Scheiner F, Huflage H et al. · European journal of radiology · (2026) · View on PubMed ↗ · Free PDF ↗
Evaluating osseointegration, bone remodeling and osteolysis after total wrist arthroplasty using photon-counting detector CT.
This prospective/longitudinal clinical study assessed osseointegration, bone remodeling, and periprosthetic osteolysis in 19 patients after total wrist arthroplasty using photon-counting detector CT (PCD-CT) at day 1, 6 months, and 12 months postoperatively. Osseointegration (bone ingrowth to the implant) increased over time across most implant zones, while cortical thickness/density and zone-based osteolysis measures were used to characterize remodeling around the prosthesis. The results indicate that PCD-CT can provide quantitative, time-resolved imaging biomarkers of implant integration and osteolysis after wrist arthroplasty.
Kämmerling N, Farnebo S, Lind G et al. · Skeletal radiology · (2026) · View on PubMed ↗ · Free PDF ↗
Generated automatically on October 07, 2026. Covers PubMed articles published September 30, 2026 – October 07, 2026. Summaries are AI-generated; always consult the original publication for clinical or research decisions.