Department of Radiology and Center for Imaging Science, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
Department of Radiology, Chung-Ang University Hospital, Chung-Ang University College of Medicine, Seoul, Korea.
Korean J Radiol. 2019 Feb;20(2):225-235. doi: 10.3348/kjr.2018.0320.
To assess whether virtual expiratory (VE)-computed tomography (CT)/ultrasound (US) fusion imaging is more effective than conventional inspiratory (CI)-CT/US fusion imaging for hepatic interventional procedures.
This prospective study was approved by the Institutional Review Board, and informed consent was obtained from each patient. In total, 62 patients with focal hepatic lesions referred for hepatic interventional procedures were enrolled. VE-CT images were generated from CI-CT images to reduce the effects of respiration-induced liver motion. The two types of CT images were fused with real-time US images for each patient. The operators scored the visual similarity with the liver anatomy upon initial image fusion and the summative usability of complete image fusion using the respective five-point scales. The time required for complete image fusion and the number of point locks used were also compared.
In comparison with CI-CT/US fusion imaging, VE-CT/US fusion imaging showed significantly higher visual similarity with the liver anatomy on the initial image fusion (mean score, 3.9 vs. 1.7; < 0.001) and higher summative usability for complete image fusion (mean score, 4.0 vs. 1.9; < 0.001). The required time (mean, 11.1 seconds vs. 22.5 seconds; < 0.001) and the number of point locks (mean, 1.6 vs. 3.0; < 0.001) needed for complete image fusion using VE-CT/US fusion imaging were significantly lower than those needed for CI-CT/US fusion imaging.
VE-CT/US fusion imaging is more effective than CI-CT/US fusion imaging for hepatic interventional procedures.
评估虚拟呼气（VE）-计算机断层扫描（CT）/超声（US）融合成像是否比传统吸气（CI）-CT/US 融合成像更有利于肝脏介入治疗。
本前瞻性研究经机构审查委员会批准，并获得每位患者的知情同意。共纳入 62 例因肝脏局灶性病变而行肝脏介入治疗的患者。从 CI-CT 图像中生成 VE-CT 图像，以减少呼吸引起的肝脏运动的影响。为每位患者将两种类型的 CT 图像与实时 US 图像融合。操作人员在初始图像融合时根据肝解剖结构的视觉相似性以及完全图像融合的综合可用性对图像融合进行评分，分别采用五分制。还比较了完全图像融合所需的时间和使用的点锁数量。
与 CI-CT/US 融合成像相比，VE-CT/US 融合成像在初始图像融合时具有更高的肝解剖结构的视觉相似性（平均评分，3.9 对 1.7；<0.001）和更高的完全图像融合的综合可用性（平均评分，4.0 对 1.9；<0.001）。VE-CT/US 融合成像完成图像融合所需的时间（平均 11.1 秒对 22.5 秒；<0.001）和点锁数量（平均 1.6 对 3.0；<0.001）明显少于 CI-CT/US 融合成像。
VE-CT/US 融合成像比 CI-CT/US 融合成像更有利于肝脏介入治疗。
