J XiaQ LiPY ChenZ ZhouCY WangJ TengPH TsuiHAO-LI LIUJ XiaQ LiPY ChenZ ZhouCY WangJ TengPH Tsui2020-10-072020-10-07201423146133https://www.scopus.com/inward/record.uri?eid=2-s2.0-84902244457&doi=10.1155%2f2014%2f764320&partnerID=40&md5=2b3e44c5d4a4a44a9c50349a15947cb9Percutaneous radiofrequency ablation (RFA) is a minimally invasive treatment to thermally destroy tumors. Ultrasound-based electrode-displacement elastography is an emerging technique for evaluating the region of RFA-induced lesions. The angle between the imaging probe and the RFA electrode can influence electrode-displacement elastography when visualizing the ablation zone. We explored the angle effect on electrode-displacement elastography to measure the ablation zone. Phantoms embedded with meatballs were fabricated and then ablated using an RFA system to simulate RFA-induced lesions. For each phantom, a commercial ultrasound scanner with a 7.5 MHz linear probe was used to acquire raw image data at different angles, ranging from 30° to 90° at increments of 10°, to construct electrode-displacement images and facilitate comparisons with tissue section images. The results revealed that the ablation regions detected using electrode-displacement elastography were highly correlated with those from tissue section images when the angle was between 30° and 60°. However, the boundaries of lesions were difficult to distinguish, when the angle was larger than 60°. The experimental findings suggest that angle selection should be considered to achieve reliable electrode-displacement elastography to describe ablation zones. © 2014 Jingjing Xia et al.article; clinical evaluation; correlation analysis; elastography; imaging system; minimally invasive procedure; needle electrode; radiofrequency ablation; radiology phantom; tissue section; ultrasound; ultrasound electrode displacement elastography; ultrasound scanner; algorithm; catheter ablation; elastography; electrode; image quality; procedures; Algorithms; Catheter Ablation; Elasticity Imaging Techniques; Electrodes; Phantoms, Imaging; Ultrasonicsjournal article10.1155/2014/7643202-s2.0-84902244457