Induced current impedance technique for monitoring brain cryosurgery in a two-dimensional model of the head.
A fast and robust finite volume solver of the two-dimensional induced current electrical impedance forward problem was developed. The numerical solver was validated by comparison with an existing analytical solution for a symmetrical geometry case, showing an accuracy of 0.07%. The solver was used to theoretically examine the sensitivity of the induced current impedance technique for the medical procedure of monitoring brain cryosurgery. The simulation was performed using a two-dimensional approximation of otherwise realistic geometry model of the head with different ice-ball sizes, simulating the expansion of the frozen lesion. The sensitivity of the scalp potential to the ice-ball size was found to be 53 x 10(-4) (relative scalp potential mm(-2)).
Zlochiver
Sharon
S
Department of Biomedical Engineering, Tel-Aviv University, Ramat-Aviv, Israel.
Radai
Michal M
MM
Rosenfeld
Moshe
M
Abboud
Shimon
S
D001698:Biomedical Engineering; D001921:Brain / Q000502:physiology / Q000601:surgery*; D003198:Computer Simulation; D003452:Cryosurgery; D017097:Electric Impedance; D006257:Head; D006801:Humans; D008953:Models, Anatomic; D008959:Models, Neurological; D008991:Monitoring, Physiologic