What’s New in Photon Counting CT?

June 17, 2026 · 6 articles · 7 research themes · covering June 10, 2026 – June 17, 2026

Overview

Across this week’s studies, photon-counting CT (PCCT/PCDCT) is repeatedly positioned as a precision imaging platform where reconstruction settings (e.g., virtual monoenergetic energy, dual-energy behavior) and quantitative thresholds materially affect diagnostic performance. In trauma, optimizing virtual monoenergetic reconstructions and ensuring adequate vascular contrast improved assessability of lower-extremity arteries in extended-leg CT workflows. In multiple myeloma, energy-dependent attenuation of femoral bone marrow on virtual monoenergetic images highlights that the choice of VMI energy (and/or thresholds) can change the accuracy and reproducibility of CT-based quantification of marrow infiltration.

Several papers extend PCCT beyond “better pictures” toward tissue-specific quantification. PCCT showed promising diagnostic performance for detecting bone marrow edema across multiple peripheral joints when compared with MRI, using reader-friendly color-coded mapping. For low back pain, PCCT-derived virtual noncontrast fat fraction and/or 70 keV attenuation correlated with MRI proton density fat fraction, supporting a potential MRI-adjunct or alternative approach for measuring paraspinal muscle fat infiltration. Finally, energy-resolved PCD-DECT could differentiate basic calcium phosphate from calcium pyrophosphate meniscal calcifications, suggesting a route to more specific characterization of calcification phenotypes relevant to osteoarthritis biology.

Outside imaging physics, a complementary diagnostic approach targeted uncertainty in CSF-venous fistula evaluation: cerebrospinal fluid beta trace protein (BTP) levels differed between positive and negative myelogram groups, supporting BTP as an objective biomarker to help distinguish spontaneous intracranial hypotension due to CVFs when myelography is inconclusive.

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Photon-Counting CT (PCDCT/PCD-DECT) for Vascular Assessment in Trauma

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. The key finding was that VME reconstructions that achieved sufficient vascular contrast (>200 Hounsfield Units) improved vascular visualization/assessability in these trauma scans (with the study also examining which VME energy level performed best, per the truncated abstract). Clinically, optimizing VME level and contrast adequacy in PCDCT may improve detection or exclusion of lower-extremity vascular pathology in polytrauma workflows.

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

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Photon-Counting CT (PCCT) 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. PCCT demonstrated diagnostic performance and reader confidence for BME detection across 123 bone regions (knee, pelvis/hip, wrist/hand, elbow) with blinded interpretation using color-coded maps and standard images. Scientifically, it supports PCCT as a potential radiation-based alternative/adjunct to MRI for BME detection in trauma, pending larger studies.

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

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Photon-Counting CT (PCCT) for Muscle Fat Quantification in Low Back Pain

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

This prospective study in 76 adults with low back pain 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). The key finding was that PCCT VNC FF and/or 70 keV attenuation metrics correlated with MRI PDFF-based fat fraction in the multifidus and other paraspinal regions, supporting PCCT for muscle fat quantification. Clinically, PCCT-based fat quantification could enable more standardized assessment of muscle degeneration in low back pain when MRI is unavailable.

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

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Photon-Counting CT (PCD-DECT) for 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 basic calcium phosphate (BCP) from calcium pyrophosphate (CPP) meniscal calcifications in 82 meniscus samples from 41 donors, using Raman spectroscopy as the reference. The key finding was that energy-resolved attenuation behavior on PCD-DECT provided discriminative information sufficient to differentiate BCP versus CPP calcification types in vivo samples. Scientifically and clinically, this enables more specific characterization of calcification pathology linked to osteoarthritis and may improve understanding of disease mechanisms.

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

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Photon-Counting CT (PCDCT) for Bone Marrow Quantification in Multiple Myeloma

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

This retrospective study evaluated energy-dependent attenuation behavior of femoral bone marrow on virtual monoenergetic images derived from dual-source photon-counting CT (PCD-CT) in 103 patients with multiple myeloma. The key finding was that bone marrow attenuation varied across reconstructed VMI energies (40–190 keV), which has direct implications for threshold-based quantitative differentiation between normal tissue and myeloma infiltration. Clinically, selecting appropriate VMI energy (or adjusting thresholds) is important to improve the accuracy and reproducibility of CT-based quantification in multiple myeloma.

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

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Biomarkers and Diagnostic Testing for CSF-Venous Fistulas

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 (CVFs) to determine whether BTP could differentiate positive versus negative myelograms. The key finding was that CSF BTP levels were elevated in patients with CSF-venous fistulas and differed between positive and negative myelogram groups. Scientifically and clinically, CSF BTP may serve as an objective biomarker to support diagnosis of spontaneous intracranial hypotension due to CVF when myelography results are uncertain.

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 17, 2026. Covers PubMed articles published June 10, 2026 – June 17, 2026. Summaries are AI-generated; always consult the original publication for clinical or research decisions.