What’s New in Photon Counting CT?

June 25, 2026 · 12 articles · 15 research themes · covering June 18, 2026 – June 25, 2026

Overview

Across this week’s set of studies and reviews, photon-counting/energy-resolving CT (PCCT/PCD-CT) is consistently framed as a practical step-change in clinical imaging—primarily through improved spectral information (e.g., iodine/gadolinium/calcium separation, virtual non-contrast) and better image quality at comparable or reduced dose. Multiple clinical comparisons against conventional energy-integrating CT (EID-CT)—including pancreatic imaging, triple-rule-out cardiothoracic vascular assessment, and orthopedic evaluation in the presence of metallic hardware—report higher diagnostic confidence and/or improved visualization when PCCT’s reconstruction options (such as virtual monoenergetic images and metal artifact reduction strategies) are leveraged.

A second dominant theme is workflow relevance in time-critical settings. Reviews focused on acute abdominal and urinary tract emergencies emphasize how spectral reconstructions can accelerate decision-making by enhancing lesion conspicuity and enabling more targeted interpretation (e.g., iodine maps and virtual non-contrast). Complementing this, feasibility and protocol studies explore functional and dose-efficient imaging: ventilation–perfusion lung assessment using xenon ventilation with gadolinium-based energy-resolved material separation, and aortic CTA strategies aimed at lowering iodine dose and/or radiation while preserving diagnostic performance.

Finally, the set highlights the translational pipeline from physics to bedside. Method development (dual-contrast material decomposition for co-administered iodine and gadolinium) and preclinical simulation (a PCCT-specific mouse HNSCC phantom platform) address the need for accurate, modality-specific modeling. The perovskite detector materials review closes the loop by outlining what must be achieved beyond basic sensitivity—stability, scalable fabrication, and system integration—to make energy-resolved photon-counting detectors clinically viable.

---

Spectral/Material Decomposition & Multi-Contrast Quantification

A pilot study: dual-contrast arthrography using photon-counting detector computed tomography with gadolinium and iodine contrasts.

This pilot study developed a photon-counting detector CT (PCD-CT) dual-contrast material decomposition method to simultaneously separate and quantify iodine, gadolinium, and calcium using calibration phantoms and an ex vivo pig-tail specimen. By reconstructing six energy bins spanning the iodine and gadolinium K-edges, the technique enabled co-administered iodine–gadolinium contrast to be disentangled and quantified beyond what conventional CT/MRI can do. Clinically, this could improve arthrography evaluation when both iodine and gadolinium are used for complementary information, while reducing ambiguity from spectral overlap.

Deng AX, Day J, Masella O et al. · Physics in medicine and biology · (2026) · View on PubMed ↗ · Free PDF ↗

---

PCCT/Photon-Counting CT for Emergency/Acute Imaging Workflows

Photon Counting CT in Abdominal Emergency Radiology.

This review article assessed the role of photon-counting CT (PCCT) in abdominal emergency radiology, focusing on its spectral imaging capabilities, improved spatial resolution, and potential radiation dose reduction. It reports that spectral reconstructions such as iodine maps and virtual non-contrast images can improve diagnostic performance for acute conditions, incidental masses, and renal stones in the emergency setting. The significance is that it frames how PCCT may enhance rapid, high-contrast decision-making in time-critical abdominal imaging.

Parrott D, Dane B · Seminars in roentgenology · (2026) · View on PubMed ↗

---

Pediatric Imaging & Radiation Reduction

Radiation dose and signal-to-noise ratio in pediatric head CT: a phantom study comparing photon-counting and energy-integrating detectors.

This phantom study compared pediatric head CT image quality and dose metrics between energy-integrating detector CT (EID-CT) and photon-counting CT (PCCT) across age-specific anthropomorphic phantoms (1, 5, and 10 years). PCCT achieved lower CTDIvol across all phantoms, and the clinically relevant image quality level range (IQL 200–300) showed the greatest relative radiation dose reduction in the 10-year-old phantom. If confirmed in clinical practice, PCCT could support lower-dose pediatric head CT while maintaining or improving signal-to-noise ratio.

Klüner LV, Zensen S, Peuster H et al. · Neuroradiology · (2026) · View on PubMed ↗ · Free PDF ↗

---

Cardiothoracic & Triple-Rule-Out Vascular Imaging

Added value of photon-counting CT for triple rule-out imaging: A propensity-matched comparison with energy-integrating CT.

This propensity-matched single-center study compared photon-counting detector CT (PCD-CT) versus energy-integrating detector CT (EID-CT) for triple rule-out (TRO) imaging in consecutive patients, using iopromide doses of 75 mL or 98.5 mL. Across vascular territories, the analysis compared CTDIvol, contrast-to-noise ratio (CNR), and diagnostic confidence (Likert 4), demonstrating added value of PCCT in TRO technical performance. The clinical significance is improved confidence and potentially better efficiency for comprehensive coronary and thoracic vascular assessment in one scan.

Hyska S, Vecsey-Nagy M, Emrich T et al. · Journal of cardiovascular computed tomography · (2026) · View on PubMed ↗ · Free PDF ↗

---

Aortic CTA Protocols (Iodine Dose/Contrast Strategies)

Retrospective assessment of low-dose and low-contrast agent protocols for photon-counting CT angiography of the aorta.

This retrospective study evaluated low-dose and/or low-contrast protocols for photon-counting CT angiography of the aorta and compared them with standard protocols, including both PCD-CT and EID-CT cohorts. Among 57 patients, low-contrast (14 mg iodine, IQ64), low-dose (21 mg iodine, IQ42), and combined low-dose/low-contrast protocols were assessed against standard PCD-CT and BMI-matched EID-CT groups. The significance is that it informs how PCCT can potentially reduce iodine dose and/or radiation while preserving diagnostic image quality for aortic CTA.

Hennes JL, Krompaß K, Huflage H et al. · The international journal of cardiovascular imaging · (2026) · View on PubMed ↗ · Free PDF ↗

---

Orthopedic Imaging with Metal Artifact Reduction

Photon-counting CT: image quality evaluation in patients with tibial plateau fracture treated with metallic osteosynthesis material.

This patient study compared photon-counting detector CT (PCD-CT) and energy-integrating detector CT (EID-CT) for image quality in 12 patients with tibial plateau fractures treated with metallic osteosynthesis. Using metal artifact reduction (iMAR) and PCD-CT virtual monoenergetic images at 70, 110, and 150 keV, radiologists scored metal artifact severity and bone/soft-tissue visualization to identify optimal PCD-CT reconstruction parameters. The clinical significance is improved artifact management and fracture visualization in the presence of orthopedic hardware, potentially supporting more reliable assessment and treatment planning.

Björkman AS, Malusek A, Persson A et al. · European radiology experimental · (2026) · View on PubMed ↗ · Free PDF ↗

---

Lung Functional Imaging (Ventilation–Perfusion, Xenon/Gadolinium)

Simultaneous pulmonary ventilation and perfusion imaging using spectral photon counting CT with xenon and gadolinium-based agents in combination with color K-edge imaging.

This feasibility study used spectral photon-counting CT (SPCCT) with xenon ventilation and a gadolinium-based ultrasmall rigid platform (USRP) injected intravenously to enable simultaneous ventilation–perfusion imaging in five New Zealand white rabbits. The authors assessed gadolinium quantification accuracy and cross-contamination with a phantom and then performed color K-edge imaging to separate materials for ventilation/perfusion evaluation. If validated, this approach could provide a single-session, energy-resolved CT method for functional lung assessment without relying on separate ventilation and perfusion acquisitions.

Robert A, Poletto S, Erhard K et al. · Diagnostic and interventional imaging · (2026) · View on PubMed ↗

---

Breast Cancer Staging & Spectral Biomarkers

Assessment of breast cancer and feasibility of subtyping of breast cancer using thoracoabdominal staging photon-counting detector computed tomography.

In a prospective study of 75 women (79 newly diagnosed breast cancers) undergoing staging, thoracoabdominal photon-counting detector CT (PCD-CT) with contrast-enhanced iodine uptake was evaluated against breast MRI as the reference standard. PCD-CT showed excellent cancer visibility and image quality, and cancer size on PCD-CT correlated significantly with MRI, supporting iodine uptake as a potential marker for breast cancer subtyping. This suggests PCD-CT could enable more accurate, spectral-CT–based staging and potentially noninvasively support molecular-like subtyping proxies.

Neubauer C, Weiß JB, Fuentes MFM et al. · Scientific reports · (2026) · View on PubMed ↗ · Free PDF ↗

---

Pancreatic Imaging & Disease Characterization

Improved pancreatic imaging with photon-counting CT: a retrospective comparison with conventional CT.

This retrospective study compared photon-counting CT (PCCT) with conventional energy-integrating detector CT (EIDCT) for pancreatic imaging in 35 patients scanned in multiple contrast phases. PCCT improved pancreatic image quality versus EIDCT, with higher subjective Likert ratings across 11 peripancreatic regions and better quantitative measures of density and noise from one reader. These findings support PCCT as a potentially more informative CT modality for detecting and characterizing pancreatic disease in clinical practice.

Brandt EGS, Christoph Müller F, Nielsen YJ et al. · Acta radiologica (Stockholm, Sweden : 1987) · (2026) · View on PubMed ↗

---

Preclinical/Simulation Platforms for PCCT

Virtual photon-counting micro-CT platform for simulation of head and neck cancer imaging in mice.

This work developed a virtual photon-counting micro-CT simulation platform to model head and neck squamous cell carcinoma (HNSCC) imaging in mice. Using a digital phantom built from affine-warped micro-CT vasculature, and training a denoising diffusion probabilistic model (DDPM) on material-decomposed iodine- and barium-enhanced tumor data from a prior PCCT study, the platform synthesized contrast-agent tumor distributions and fused them with vascularized anatomy to create realistic mouse HNSCC phantoms. The platform enables more accurate, PCCT-specific preclinical imaging simulations that can accelerate study design and interpretation for mouse HNSCC experiments.

Nadkarni R, Clark DP, Allphin AJ et al. · Physics in medicine and biology · (2026) · View on PubMed ↗ · Free PDF ↗

---

Detector & Hardware Materials (Perovskites and Translation Roadmaps)

From Materials to Medical Images: Translating Perovskite-Based X-Ray Detectors Toward Clinical Imaging.

This translational article reviewed how perovskite-based X-ray detector materials—especially metal halide perovskites—could be engineered to meet clinical imaging requirements such as low-dose operation, high spatial resolution, energy-resolved detection, stability, and scalable fabrication. It emphasizes that clinical translation depends on more than basic sensitivity or detection limits, including practical detector performance and integration considerations. The significance is that it provides a roadmap for moving perovskite detectors from laboratory demonstrations toward clinically usable photon-counting/energy-resolving imaging systems.

Wang S, Yang Y, Zhang K et al. · Advanced science (Weinheim, Baden-Wurttemberg, Germany) · (2026) · View on PubMed ↗ · Free PDF ↗

---

Urinary Tract Emergencies & Imaging Algorithms

Acute Non-Traumatic Urinary Tract Emergencies: The Central Role of CT Imaging and the Emerging Role of Photon-Counting CT.

This narrative review summarized imaging strategies for acute non-traumatic urinary tract emergencies in emergency department patients, emphasizing the central role of CT and the emerging role of photon-counting CT (PCCT). It highlights how CT findings across obstructive, infectious, vascular, hemorrhagic, and urinary leak conditions guide diagnosis and management, and it outlines where PCCT’s spectral reconstructions (e.g., iodine maps and virtual non-contrast) may add value. The significance is that it provides a practical framework for adopting PCCT in acute urinary tract imaging workflows.

Scaglione M, Masala SA, Di Grezia G et al. · Canadian Association of Radiologists journal = Journal l’Association canadienne des radiologistes · (2026) · View on PubMed ↗ · Free PDF ↗

---

---

Generated automatically on June 25, 2026. Covers PubMed articles published June 18, 2026 – June 25, 2026. Summaries are AI-generated; always consult the original publication for clinical or research decisions.