Radiology:主动脉CTA--个体化触发延迟效果怎么样?

2019-09-21 shaosai MedSci原创

背景:现如今CT设备扫描时间非常快,不同患者间循环差异较大,如何把握团注对比剂后最佳扫描时间是一种挑战。本研究旨在比较团注对比剂后,统一触发机制与个性化触发机制CTA的对比剂密度强化差异。

背景:现如今CT设备扫描时间非常快,不同患者间循环差异较大,如何把握团注对比剂后最佳扫描时间是一种挑战。本研究旨在比较团注对比剂后,统一触发机制与个性化触发机制CTA的对比剂密度强化差异。

本研究纳入了2个不同扫描方案群体:触发延迟4秒扫描组和患者个性化触发延迟组。所有CT扫描和对比剂注射方案相同。由1名阅片者客观评价扫描图像质量。利用独立样本T检验评价平均密度的差异,利用Wilcoxon-Mann-Whitney检验比较噪声、对比噪声比和主观图像质量差异。

结果为,常规触发延迟组及患者个性化触发延迟组均有108例。在患者个性化触发延迟组延迟时间为6.4-11.3 seconds (平均为9.2 seconds)。在患者个性化触发延迟组整体密度要高于常规触发延迟组(486 HU ± 92 vs 438 HU ± 99; P < .001),自主动脉弓(8 HU)到髂动脉(95 HU)差异越来越大。回归模型显示患者个性化触发延迟组密度波动较小,而在常规触发延迟组自主动脉弓到髂动脉密度逐渐降低(约在髂动脉水平降低87HU, P < .001)。在两组噪声间无统计学差异(20 vs 19; P = .41),但患者个性化触发延迟组对比噪声比(21 vs 19; P = .04)。和主观图像质量(优及良好比例分别为100% vs 67%; P < .001)要优于常规触发延迟组。

本研究表明,与常规延迟触发时间行主动脉CTA相比,对比剂团注后患者个性化触发延迟能够提高图像质量及一直的对比密度强度。

原始出处:

Hinzpeter R, Eberhard M, Gutjahr R,et al.CT Angiography of the Aorta: Contrast Timing by Using a Fixed versus a Patient-specific Trigger Delay.Radiology.DOI:10.1148/radiol.2019182223

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    2020-08-19 windight
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    2019-09-21 天地飞扬

    学习

    0

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    2019-09-21 CHANGE

    疗效只是效果的众多方面之一,还要看对患者的获益,包括生活质量等因素共同决定效果的

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