Chiba Ayaka, Harada Kohei, Ohashi Yoshiya, Numasawa Kanako, Imai Tatsuya, Hayasaka Shun
Division of Radiology and Nuclear Medicine, Sapporo Medical University Hospital, 291, West-16, South-1, Chuo-ku, Sapporo, Hokkaido, 060-8543, Japan.
Radiol Phys Technol. 2020 Mar;13(1):92-97. doi: 10.1007/s12194-020-00556-5. Epub 2020 Feb 13.
Computed tomography arterial portography (CTAP) is widely used with a fixed scan timing and contrast medium quantity; however, these parameters are not necessarily optimal. In this study, CTAP scan timing was analyzed by different bolus tracking methods to monitor the inflow of the contrast medium in real-time. A total of 249 patients who underwent CTAP were assessed. In 30 patients, the CTAP scanning began 33 s after contrast medium injection started (fixed method). In 74 patients, the regions of interest (ROIs) were established at two places in the inferior vena cava above the hepatic vein (inferior vena cava-ROI method). In 145 patients, the ROI was established at two places in the liver parenchyma (liver parenchyma-ROI method). Scan timing was considered appropriate when the difference in the CT value between the hepatic and portal veins approached 0; this was observed significantly more with the liver parenchyma-ROI method than with the other methods. CTAP scan timing with the liver parenchyma-ROI method was better than that with the fixed and inferior vena cava-ROI methods.
计算机断层扫描动脉门静脉造影（CTAP）在扫描时间和造影剂用量固定的情况下被广泛应用；然而，这些参数不一定是最佳的。在本研究中，通过不同的团注追踪方法分析CTAP扫描时间，以实时监测造影剂的流入情况。共有249例接受CTAP检查的患者接受了评估。在30例患者中，CTAP扫描在造影剂注射开始33秒后开始（固定方法）。在74例患者中，在肝静脉上方的下腔静脉两个位置设定感兴趣区（下腔静脉-感兴趣区方法）。在145例患者中，在肝实质两个位置设定感兴趣区（肝实质-感兴趣区方法）。当肝静脉和门静脉之间的CT值差异接近0时，扫描时间被认为是合适的；肝实质-感兴趣区方法观察到这种情况的比例明显高于其他方法。肝实质-感兴趣区方法的CTAP扫描时间优于固定方法和下腔静脉-感兴趣区方法。
