集成光子计数CT血管成像重建协议用于颈动脉支架评估
研究纳入31例颈动脉支架置入术后患者，采用光子计数CT血管成像，比较集成重建协议（0.4mm层厚、Qr56内核、QIR3、55keV虚拟单能、金属伪影校正关闭）与常规协议的图像质量。结果显示集成协议在支架内管腔CNR、支架边缘上升斜率、伪影指数及主观图像质量、锐利度、噪声方面均显著优于常规协议。
要点
- 集成协议可显著提高支架内管腔CNR和支架边缘锐利度。
- 集成协议降低支架内伪影指数和噪声，改善主观图像质量。
- 推荐将集成协议用于颈动脉支架术后光子计数CT随访。
关键影像表现/征象
- 集成协议下支架内管腔CNR较常规协议提高（β=34.5，95%CI 30.0-39.0，P<0.001）。
- 支架边缘上升斜率增大（β=1727，95%CI 1697-1759，P<0.001），提示边缘更锐利。
- 支架内管腔伪影指数降低（β=-39.6，95%CI -44.9至-34.4，P<0.001）。
- 主观图像质量评分提高（β=2.15，95%CI 2.04-2.27，P<0.001）。
- 支架边缘锐利度评分提高（β=1.75，95%CI 1.65-1.85，P<0.001），噪声评分改善（β=1.15，95%CI 1.04-1.27，P<0.001）。
诊断标准与关键数值
- 集成协议参数：层厚0.4mm，视野120mm，内核Qr56，迭代重建QIR3，虚拟单能55keV，金属伪影校正算法关闭。
- 定量指标包括支架内管腔CNR、支架边缘上升斜率、支架内管腔伪影指数。
- 定性评估包括支架内管腔图像质量、支架边缘锐利度、支架内管腔噪声。
临床应用与阅片要点
- 日常阅片可采用集成协议重建图像评估颈动脉支架，以提高支架内管腔可视性。
- 注意该协议关闭了金属伪影校正算法，需结合55keV虚拟单能图像综合判断。
- 定量参数如CNR和伪影指数可用于客观比较不同重建协议。
局限性
- 样本量较小（31例），均为男性，可能存在选择偏倚。
- 单中心回顾性研究，结果需多中心验证。
以上解读依据论文摘要（全文未开放获取或许可不允许翻译转载）。
英文原文（摘要）· 点击展开
BACKGROUND AND PURPOSE: To evaluate an integrated protocol and to improve image quality for follow-up after carotid artery stenting (CAS) using photon-counting CT (PCD-CT) angiography.
MATERIALS AND METHODS: Patients who underwent CT angiography (CTA) after CAS using PCD-CT in 2023-2025 were included. We predefined an integrated reconstruction protocol that combines multiple reconstruction parameters into a clinically applicable configuration under practical feasibility constraints, and that can be consistently applied to all cases. Reconstruction parameters were as follows: slice thickness, 0.4mm; field-of-view, 120mm; kernel, Qr56; iterative reconstruction, QIR3; virtual monoenergetic image, 55keV, metal artifact reduction algorithm, off. We quantitatively measured in-stent luminal contrast-to-noise ratio (CNR), stent edge rise slope (ERS), and in-stent luminal artifact index inside stents (AI). We qualitatively assessed in-stent luminal image quality (IQ), stent edge sharpness, and in-stent luminal noise. We compared integrated protocol to our institution conventional protocol. Linear mixed-effects models were used for statistical analyses.
RESULTS: 31 patients (median 77 years [71-79], 31 men) were included. Using conventional protocol as the reference, integrated protocol showed β = 34.5 (95%CI, 30.0 to 39.0; P < 0.001) in CNR, β = 1727 (95%CI, 1697 to 1759; P < 0.001) in ERS, β = -39.6 (95%CI, -44.9 to -34.4; P < 0.001) in AI, β = 2.15 (95%CI, 2.04 to 2.27; P < 0.001) in OIQ, β = 1.75 (95%CI, 1.65 to 1.85; P < 0.001) in sharpness, β = 1.15 (95%CI, 1.04 to 1.27; P < 0.001) in noise.
CONCLUSION: Integrated protocol for CAS using PCD-CT yielded superior qualitative and quantitative performance compared with the conventional protocol.
引用
- Nakashima M, Kawai T, Matsumoto K, et al. Evaluation of an Integrated Photon-Counting Detector CT Angiography Reconstruction Protocol for Carotid Artery Stents. AJNR Am J Neuroradiol. 2026. PMID: 42103477. doi:10.3174/ajnr.A9398
供执业医师工作参考，不替代临床判断；数值与分级以指南原文为准。