title: Considering angle selection when using ultrasound electrode displacement elastography to evaluate radiofrequency ablation of tissues.
abstract: Percutaneous 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.
authors: School of Electronic Information Engineering, Tianjin University, Tianjin 300072, China.
authors: Jingjing
authors: 0000-0002-6629-8554
authors: J
authors: Xia
authors: School of Electronic Information Engineering, Tianjin University, Tianjin 300072, China.
authors: Qiang
authors: Q
authors: Li
authors: Department of Medical Imaging and Radiological Sciences, College of Medicine, Chang Gung University, 259 Wen-Hwa 1st Road, Kwei-Shan, Taoyuan, Taoyuan County 33302, Taiwan.
authors: Pin-Yu
authors: PY
authors: Chen
authors: Biomedical Engineering Center, College of Life Science and Bioengineering, Beijing University of Technology, Beijing 100124, China.
authors: Zhuhuang
authors: 0000-0003-0570-8473
authors: Z
authors: Zhou
authors: Department of Medical Imaging and Radiological Sciences, College of Medicine, Chang Gung University, 259 Wen-Hwa 1st Road, Kwei-Shan, Taoyuan, Taoyuan County 33302, Taiwan ; Graduate Institute of Clinical Medical Sciences, College of Medicine, Chang Gung University, Taoyuan 33302, Taiwan.
authors: Chiao-Yin
authors: CY
authors: Wang
authors: Department of Electrical Engineering, Chang Gung University, Taoyuan 33302, Taiwan.
authors: Hao-Li
authors: HL
authors: Liu
authors: School of Electronic Information Engineering, Tianjin University, Tianjin 300072, China.
authors: Jianfu
authors: J
authors: Teng
authors: Department of Medical Imaging and Radiological Sciences, College of Medicine, Chang Gung University, 259 Wen-Hwa 1st Road, Kwei-Shan, Taoyuan, Taoyuan County 33302, Taiwan ; Institute for Radiological Research, Chang Gung Memorial Hospital at Linkou, Chang Gung University, Taoyuan 33302, Taiwan.
authors: Po-Hsiang
authors: 0000-0002-5604-1800
authors: PH
authors: Tsui
mesh_terms: D000465:Algorithms; D017115:Catheter Ablation / Q000379:methods*; D054459:Elasticity Imaging Techniques / Q000379:methods*; D004566:Electrodes; D019047:Phantoms, Imaging; D014465:Ultrasonics / Q000379:methods*