What’s New in Photon Counting CT?

June 16, 2026 · 6 articles · 6 research themes · covering June 09, 2026 – June 16, 2026

Overview

Across these studies, photon-counting CT (PCCT) and photon-counting detector dual-energy CT (PCD-DECT) are repeatedly positioned as platforms for more quantitative, tissue-specific imaging—often by leveraging virtual monoenergetic reconstructions and energy-dependent behavior. In trauma and musculoskeletal contexts, optimized virtual monoenergetic (VME) reconstructions improved assessability of lower-extremity arteries in polytrauma workflows, while PCCT showed reliable detection of bone marrow edema across peripheral joints when benchmarked against MRI. Together, these findings suggest that photon-counting techniques can extend CT beyond morphology toward functional/biologic characterization without changing overall scan strategies.

Several papers also focus on quantitative compositional imaging and the physics needed to make it robust. For low back pain, PCCT-derived 70 keV attenuation and virtual noncontrast fat fraction (VNC FF) agreed with MRI-based proton density fat fraction for paraspinal muscle fat infiltration, supporting a CT alternative to MRI for chronic musculoskeletal degeneration. In bone and calcification, energy-dependent attenuation and spectral separation emerged as key themes: dual-energy photon-counting CT could distinguish meniscal calcification types (BCP vs CPP) using Raman spectroscopy as a reference, and another study in multiple myeloma emphasized that femoral marrow attenuation varies with photon energy—an important consideration for threshold-based quantification of myeloma infiltration.

Outside the photon-counting imaging theme, one study addressed diagnostic uncertainty in CSF-venous fistula evaluation by testing cerebrospinal fluid beta trace protein (BTP) as an objective biomarker. If validated, CSF BTP could help differentiate positive versus negative myelography results when imaging is equivocal, complementing advanced imaging approaches with biochemical decision support.

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Photon-Counting CT for Trauma Vascular Imaging

Impact of virtual monoenergetic images on the assessability of lower extremity arteries in (Poly-) trauma photon-counting detector CT.

This study evaluated how virtual monoenergetic (VME) image reconstructions from photon-counting detector CT (PCDCT) affect the assessability of lower-extremity arteries in (poly-)trauma patients undergoing extended leg CT with a double-bolus contrast protocol. VME reconstructions that achieved sufficient vascular contrast (>200 Hounsfield Units) were assessed to determine which VME energy level(s) best supported arterial visualization. If optimized, VME on PCDCT could improve vascular pathology detection in trauma workflows without changing the overall scan strategy.

Dillinger D, Bauer C, Kaatsch HL et al. · Emergency radiology · (2026) · View on PubMed ↗

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Photon-Counting CT for Bone Marrow Edema Detection

Exploratory Evaluation of Photon-Counting CT for Bone Marrow Edema Detection Across Multiple Joints: A Pilot Study.

This pilot study retrospectively assessed photon-counting CT (PCCT) for detecting bone marrow edema (BME) across multiple peripheral joints in 10 trauma patients, using MRI as the reference standard. Two blinded readers evaluated 123 bone regions on PCCT (including color-coded maps) and compared diagnostic performance and reader confidence against MRI. Demonstrating reliable BME detection with PCCT could expand quantitative, radiation-efficient imaging options for trauma-related marrow pathology.

Shahzadi I, Reimann G, Schneider C et al. · RoFo : Fortschritte auf dem Gebiete der Rontgenstrahlen und der Nuklearmedizin · (2026) · View on PubMed ↗

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CT-Based Quantification of Muscle Fat Infiltration

Photon-counting CT for paraspinal muscle fat quantification compared with MRI proton density fat fraction.

This prospective study compared photon-counting CT (PCCT)–derived 70 keV attenuation and virtual noncontrast fat fraction (VNC FF) for quantifying paraspinal muscle fat infiltration against MRI proton density fat fraction (PDFF) in 76 adults with low back pain. PCCT measures were evaluated for agreement with MRI PDFF using same-day imaging (PCCT and 6-echo q-Dixon MRI within 2 hours), with bilateral ROI analysis in paraspinal muscles. If concordant, PCCT could provide a CT-based alternative to MRI for assessing muscle fat infiltration relevant to chronic low back pain and musculoskeletal degeneration.

Shu D, Wang J, Liang D et al. · BMC medical imaging · (2026) · View on PubMed ↗ · Free PDF ↗

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Photon-Counting Dual-Energy CT for Tissue/Calcification Characterization

Characterizing Meniscal Calcifications with Photon Counting-Based Dual-Energy Computed Tomography.

This study investigated whether photon-counting detector dual-energy CT (PCD-DECT) can distinguish meniscal calcification types—basic calcium phosphate (BCP) versus calcium pyrophosphate (CPP)—in 82 meniscus samples from 41 donors. Using Raman spectroscopy as the reference, the authors characterized calcification-specific imaging behavior at 120 kVp with two energy bins (20–50 keV and 50–120 keV). Being able to differentiate BCP from CPP in vivo would improve understanding of calcification mechanisms and their relationship to osteoarthritis.

Nevanranta EA, Karjalainen VP, Brix M et al. · Annals of biomedical engineering · (2026) · 1 citations · View on PubMed ↗ · Free PDF ↗

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Energy-Dependent Quantitative Imaging in Bone Marrow Disease

Energy-resolved attenuation behaviour on dual-source photon-counting CT: Implications for quantitative assessment of femoral bone marrow in multiple myeloma.

This retrospective study characterized the energy-dependent attenuation behavior of femoral bone marrow on virtual monoenergetic images (40–190 keV) derived from dual-source photon-counting CT in 103 patients with multiple myeloma. The work assessed how marrow attenuation varies with photon energy and what that implies for threshold-based quantitative separation of physiological marrow from myeloma infiltration. Accounting for energy-dependent attenuation could improve the accuracy and robustness of CT-based quantitative myeloma assessment.

Heidemeier A, Scheiner F, Huflage H et al. · European journal of radiology · (2026) · View on PubMed ↗ · Free PDF ↗

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Biomarkers for CSF-Venous Fistula Diagnosis

Elevated CSF Beta Trace Protein Levels in Patients with CSF-Venous Fistulas.

This prospective study measured cerebrospinal fluid (CSF) beta trace protein (BTP) levels in 71 patients undergoing lateral decubitus myelography for suspected CSF-venous fistulas (CVF) to determine whether BTP differentiates positive versus negative myelograms. CSF BTP concentrations were compared between patients with positive and negative myelography results. If validated, CSF BTP could serve as an objective biomarker to support diagnosis of CVF-related spontaneous intracranial hypotension when myelography is equivocal.

Mark IT, Habibi P, Kim DK et al. · AJNR. American journal of neuroradiology · (2026) · View on PubMed ↗ · Free PDF ↗

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Generated automatically on June 16, 2026. Covers PubMed articles published June 09, 2026 – June 16, 2026. Summaries are AI-generated; always consult the original publication for clinical or research decisions.