门静脉期CT肠缺血检测：双能及光子计数光谱成像的多读者评估
这项单中心回顾性多读者交叉诊断准确性研究纳入378例患者，比较门静脉期混合CT图像与补充光谱重建（40keV虚拟单能图、碘图、虚拟平扫）对急性肠缺血的诊断性能。光谱重建将准确率从73%提升至86%，敏感度从75%升至87%，特异度从72%升至86%，AUC平均提高0.16，且在双能CT与光子计数CT上效果相似。
要点
- 门静脉期CT加做光谱重建可显著提高肠缺血诊断准确率、敏感度和特异度。
- 光谱重建在双能CT和光子计数CT上带来的诊断增益相似，无平台特异性差异。
- 单次门静脉期采集即可获得光谱重建，不增加额外扫描或辐射剂量。
诊断标准与关键数值
- 光谱重建较混合图像将准确率从73%（95%CI 68-77）提高至86%（82-89），OR 2.30（95%CI 1.70-3.10），p<0.001。
- 敏感度从75%（95%CI 68-82）提高至87%（81-92），p=0.008。
- 特异度从72%（95%CI 65-78）提高至86%（80-90），p<0.001。
- 平均AUC提高0.16（95%CI 0.12-0.20），p<0.001。
- 双能CT与光子计数CT平台间交互作用p=0.24，提示无平台特异性效应修饰。
临床应用与阅片要点
- 在门静脉期腹部CT阅片时，补充40keV虚拟单能图、碘图和虚拟平扫可提高肠缺血检出信心。
- 光谱重建不增加额外采集或辐射，适合急诊腹部CT流程中常规使用。
- 双能CT与光子计数CT均可获得相似诊断增益，无需因平台不同调整判读策略。
局限性
- 本研究为单中心回顾性设计，结论外推需谨慎。
- 参考标准为预设复合标准而非统一病理金标准，可能存在分类偏倚。
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
OBJECTIVES: To compare the diagnostic performance of portal-venous (PV) blended CT images alone vs PV blended images supplemented with spectral reconstructions for detecting acute bowel ischemia, stratified by scanner platform (dual-energy CT [DECT] vs photon-counting CT [PCCT]).
MATERIALS AND METHODS: This retrospective single-center, multireader, crossover diagnostic accuracy study compared PV blended images alone (image set A) with PV blended images supplemented by spectral reconstructions (image set B: 40-keV virtual monoenergetic images, iodine maps, and virtual non-contrast images) acquired on DECT and PCCT. The reference standard was a prespecified composite derived from surgical and index-hospitalization documentation. Diagnostic performance was analyzed using mixed-effects logistic models for accuracy, sensitivity, and specificity, cumulative link mixed models for 7-point suspicion scores, and ROC analyses using a multireader multicase framework.
RESULTS: A total of 378 patients (mean age, 68.1 years ± 7.4, 206 men) were evaluated. 150/378 (39.7%) were ischemia-positive by the composite reference standard. Accuracy increased from 73% (95% CI: 68-77) with blended images to 86% (82-89) with spectral reconstructions (OR: 2.30; 95% CI: 1.70-3.10; p < 0.001). Sensitivity increased from 75% (68-82) to 87% (81-92) (p = 0.008) and specificity from 72% (65-78) to 86% (80-90) (p < 0.001). Mean AUC improved by 0.16 (95% CI: 0.12-0.20; p < 0.001). Effects were similar on DECT and PCCT (interaction p = 0.24).
CONCLUSION: Adding spectral reconstructions to PV blended images improved accuracy, sensitivity, specificity, and diagnostic confidence for bowel ischemia detection, without evidence of platform-specific effect modification.
KEY POINTS: Question Can spectral reconstructions improve bowel ischemia detection on portal venous (PV) phase abdominal CT, and are these gains consistent across DECT and PCCT? Findings Adding spectral reconstructions to PV blended images improved diagnostic performance and agreement for bowel ischemia on abdominal CT, with comparable effects on DECT and PCCT. Clinical relevance Spectral reconstructions from a single PV acquisition may improve emergency abdominal CT interpretation for bowel ischemia without additional acquisitions or radiation.
引用
- Mankertz F, Berger J, Maalouf N, et al. Bowel ischemia detection on portal venous CT: multireader evaluation of dual-energy and photon-counting spectral imaging. Eur Radiol. 2026. PMID: 42045509. doi:10.1007/s00330-026-12546-z
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。