Accuracy of MR temperature measurement based on chemical shift change for radiofrequency ablation using hook-shaped electrodes.
The purpose of the current study is to evaluate the accuracy of MR thermometry for radiofrequency ablation (RFA) with hook-shaped electrodes. The objects were eight extracted bovine livers. The chemical shift change was calculated from MR images acquired with a spoiled gradient echo sequence and compared with the temperature directly measured with a thermocouple. Linear regression was established between them with a coefficient of -0.0110+/-0.0007 ppm/ degrees C and errors were calculated as -0.50+/-7.50 degrees C. MR thermometry is capable of monitoring temperature for RFA.
Okuda
Shigeo
S
Department of Diagnostic Radiology, Keio University School of Medicine, Tokyo, Japan. okuda@sc.itc.keio.ac.jp
Kuroda
Kagayaki
K
Kainuma
Osamu
O
Oshio
Koichi
K
Fujiwara
Hirokazu
H
Kuribayashi
Sachio
S
D000818:Animals; D017115:Catheter Ablation / Q000295:instrumentation*; D002417:Cattle; D004566:Electrodes; D004867:Equipment Design; D006979:Hyperthermia, Induced; D008099:Liver / Q000601:surgery*; D008279:Magnetic Resonance Imaging / Q000379:methods*; D013696:Temperature