Pediatric Chest Photon-counting CT: Dose and Noise Behavior of Clinical Sn100 kVp and 90 kVp Protocols across Image Quality Levels - a Phantom Study.

IF 2 4区医学 Q3 RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING

Rofo-fortschritte Auf Dem Gebiet Der Rontgenstrahlen Und Der Bildgebenden Verfahren Pub Date : 2026-09-21 DOI:10.1055/a-2935-4084

Laura Valentina Klüner, Sebastian Zensen, Hannah Peuster, Melanie Ebenau, Denise Bos, Raya Ocker-Serger, Yannick Laurent Thal, Luca Salhöfer, Florian Stehling, Daniel Bernard, Erik Büscher, Matthias Welsner, Lale Umutlu, Michael Forsting, Johannes Haubold, Marcel Klaus Opitz

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Abstract

Purpose: Photon-counting CT (PCCT) and spectral shaping enable new approaches in pediatric imaging, but the effects of clinically implemented tin-filtered pediatric chest protocols on radiation dose and image noise across image quality levels (IQLs) remain insufficiently characterized. This study compared a clinical Sn100 kVp ultra-high resolution (UHR) protocol with a non-tin-filtered 90 kVp standard-resolution protocol using anthropomorphic pediatric phantoms.

Materials and methods: Three pediatric phantoms (1, 5, and 10 years) were scanned on a commercial PCCT system across IQLs 1-300 using the clinical Sn100 kVp UHR and non-tin-filtered 90 kVp standard-resolution protocols. Radiation dose and ROI-based image noise in lung parenchyma and bone were recorded.

Results: The Sn100 kVp UHR protocol showed lower lung-parenchymal noise across all phantom sizes and IQLs and generally lower bone noise. In the ultra-low-dose range (IQL 1-10), lung-parenchymal noise reductions ranged from 31% to 52% and bone-noise reductions reached 58%. Across most IQLs, the Sn100 kVp UHR protocol was associated with higher radiation dose. At high IQLs, dose plateaus occurred at approximately IQL 150 and 100 in the 5- and 10-year-old phantoms, followed by dose crossovers at approximately IQL 220 and 150, respectively. At very low IQLs, the Sn100 kVp UHR protocol showed a dose advantage up to IQL 5, 4, and 3 in the 1-, 5-, and 10-year-old phantoms, respectively.

Conclusions: The Sn100 kVp UHR protocol was associated with lower image noise but was not universally dose-saving compared with the non-tin-filtered 90 kVp standard-resolution protocol. In addition, the observed dose behavior was influenced not only by spectral shaping but also by detector readout mode and protocol-specific technical constraints. These findings may support future pediatric chest PCCT protocol optimization.

Key points: · The clinical Sn100 kVp UHR protocol was associated with lower lung-parenchymal noise and generally lower bone noise compared with the non-tin-filtered 90 kVp standard-resolution protocol.. · The dose advantage of the Sn100 kVp UHR protocol was limited to very low IQLs, while most IQLs showed higher radiation dose compared with the 90 kVp standard-resolution protocol.. · At high image quality levels, the Sn100 kVp UHR protocol exhibited dose plateaus, limiting further dose increase despite higher target image quality..

Citation format: · Klüner LV, Zensen S, Peuster H et al. Pediatric Chest Photon-counting CT: Dose and Noise Behavior of Clinical Sn100 kVp and 90 kVp Protocols across Image Quality Levels - a Phantom Study. Rofo 2026; DOI 10.1055/a-2935-4084.

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儿童胸部光子计数CT：临床Sn100 kVp和90 kVp方案跨图像质量水平的剂量和噪声行为-一项幻影研究

目的：光子计数CT （PCCT）和光谱整形为儿科成像提供了新的方法，但临床实施的锡过滤儿科胸部方案对辐射剂量和图像质量水平（iql）图像噪声的影响仍然没有充分表征。本研究比较了临床Sn100 kVp超高分辨率（UHR）方案与非锡过滤的90 kVp标准分辨率方案，使用拟人化儿童模型。材料和方法：使用临床Sn100 kVp UHR和非锡过滤的90 kVp标准分辨率方案，在商用PCCT系统上扫描3名儿童（1岁、5岁和10岁），IQLs为1-300。记录肺实质和骨的辐射剂量和基于roi的图像噪声。结果：Sn100 kVp UHR方案在所有幻象大小和iql中显示较低的肺实质噪声，并且通常较低的骨噪声。在超低剂量范围内（IQL 1-10），肺实质噪声降低31% - 52%，骨噪声降低58%。在大多数iql中，Sn100 kVp UHR方案与较高的辐射剂量相关。在高IQL时，5岁和10岁的幽灵在IQL约150和100处出现剂量平台，随后分别在IQL约220和150处出现剂量交叉。在非常低的IQL下，Sn100 kVp UHR方案在1岁、5岁和10岁的模型中分别显示出高达IQL 5、4和3的剂量优势。结论：Sn100 kVp UHR方案与较低的图像噪声相关，但与非锡过滤的90 kVp标准分辨率方案相比，并非普遍节省剂量。此外，观察到的剂量行为不仅受到光谱整形的影响，还受到检测器读出模式和特定协议的技术限制的影响。这些发现可能支持未来儿科胸部PCCT方案的优化。·与非锡过滤的90 kVp标准分辨率方案相比，临床Sn100 kVp UHR方案具有更低的肺实质噪声和更低的骨噪声。·Sn100 kVp UHR方案的剂量优势仅限于非常低的iql，而大多数iql与90 kVp标准分辨率方案相比显示更高的辐射剂量。·在高图像质量水平下，Sn100 kVp UHR方案呈现剂量平台期，限制了剂量的进一步增加，尽管目标图像质量更高。儿童胸部光子计数CT：临床Sn100 kVp和90 kVp方案跨图像质量水平的剂量和噪声行为-一项幻影研究Rofo 2026;DOI 10.1055 / - 2935 - 4084。

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Rofo-fortschritte Auf Dem Gebiet Der Rontgenstrahlen Und Der Bildgebenden Verfahren 医学-核医学

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1.20

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5.60%

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340

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