What’s New in Photon Counting CT?

September 18, 2026 · 2 articles · 2 research themes · covering September 11, 2026 – September 18, 2026

Overview

Two recent papers converge on the same theme: photon-counting detector CT (PCD-CT/PCCT) is not just a hardware upgrade, but a platform whose detector physics meaningfully changes both image quality and how scans should be acquired and interpreted. A head-and-neck-focused review highlights clinically relevant benefits—sharper spatial detail, lower noise and metal artifacts, potential dose and iodinated contrast reduction, and the added value of spectral imaging for visualizing small anatomic structures important for preoperative planning and postoperative assessment.

Complementing this clinical perspective, an experimental phantom study shows that quantitative performance in PCD-CT virtual monoenergetic images (VMI) depends on acquisition parameters in practice. Specifically, VMI CT values and contrast-to-noise ratios (CNR) are not fully independent of tube voltage (kV), and optimal CNR may require choosing kV settings tailored to the target VMI energy rather than relying on a single universal protocol. Together, the studies suggest that realizing PCCT’s advantages will depend on both application-specific use cases and careful standardization/optimization of acquisition settings to support reliable quantitative comparisons across patients and scanners.

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Photon-Counting CT (PCCT/PCD-CT) Clinical Applications

Photon-counting CT in head and neck radiology: bridging detector physics and clinical applications.

This article reviewed photon-counting computed tomography (PCCT) for head and neck imaging, focusing on how detector physics translate into clinical performance compared with conventional energy-integrating detector CT (EID-CT). It reports that PCCT’s key advantages include improved spatial resolution, reduced image noise and metal artifacts, lower radiation exposure, reduced iodinated contrast dose, and added spectral imaging capabilities that enable better visualization of small vessels, ossicles, and cartilage for preoperative planning and postoperative assessment. These technical improvements are clinically significant because they can enhance diagnostic confidence and surgical planning while potentially reducing patient dose and contrast burden in head and neck radiology.

Martín-Noguerol T, Escartín J, López-Úbeda P et al. · European radiology · (2026) · View on PubMed ↗

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Photon-Counting CT Acquisition Optimization (kV/VMI/CNR/Quantification)

Influence of X-ray Tube Voltage on Computed Tomography Values and Contrast-Noise Ratios in Virtual Monoenergetic Images in routine clinical Photon Counting Detector Computed Tomography: Does kV Still Matter?

This study evaluated how X-ray tube voltage (kV) affects computed tomography (CT) values and contrast-to-noise ratios (CNR) in virtual monoenergetic images (VMI) generated by routine clinical photon-counting detector CT (PCD-CT) across tissue types, VMI keV levels, and kV settings using phantom models of different sizes. The key finding is that VMI CT values and CNR are not entirely independent of kV in practice, and specific kV settings can yield optimal CNR for a given VMI energy rather than a single universal setting. This matters scientifically and clinically because it informs how to standardize or optimize PCD-CT acquisition parameters for more reliable quantitative comparisons across scans and patients.

Jeukens CRLPN, Pinckaers FME, Martens B et al. · Investigative radiology · (2026) · View on PubMed ↗ · Free PDF ↗

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Generated automatically on September 18, 2026. Covers PubMed articles published September 11, 2026 – September 18, 2026. Summaries are AI-generated; always consult the original publication for clinical or research decisions.