④回顾性4D CT：自主呼吸下，系统根据呼吸波形低pitch值螺旋扫描，重建出10组相位图。 准确反映相位信息，最后进行 MIP 和Average重建。 综合以上分析，临床实际应用中多以回顾 …

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Four-dimensional computed tomography (4DCT) is a type of CT scanning which records multiple images over time. It allows playback of the scan as a video, so that physiological processes …

传统3d扫描只能扫描患者某个呼吸时相上的图像，而4d扫描可以根据患者的呼吸扫描全时相，更为准确的评估胸腹部肿瘤运动，具有减小靶区外放，降低放疗副作用等优点。

4DCBCT获取到影像后，可以观察肿瘤的运动情况，主要作用是观察肿瘤的活动度有没有超过照射范围（PTV）。 本质. 4DCT技术的本质，更像是辅助医生给定一个更合适的外放范围（不要 …

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2016年10月19日 · This data collection consists of images acquired during chemoradiotherapy of 20 locally-advanced, non-small cell lung cancer patients. The images include four-dimensional …

Figure 4 shows the simulated 10-phase 4D-CT images for a regular respiratory trajectory profile (breathing period: 5 s) (Figure 4 (a)) and an irregular respiratory trajectory of a patient...

Recently, breathing-adapted 4D CT (i4DCT) was introduced into clinical practice, promising artifact reduction in in-silico and phantom studies. Here, we present an image quality …

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