Radiance-based monitoring of the extent of tissue coagulation during laser interstitial thermal therapy.
Optical monitoring relates the dynamic changes in measured light intensity to the extent of treatment-induced coagulation that occurs during laser interstitial thermal therapy. We utilized a two-region Monte Carlo simulation to elucidate the nature of the changes in interstitial radiance and fluence that result from the formation of a volume of thermal coagulation surrounding a cylindrical emitter. Using simulation results, we demonstrate that radiance sensors are more sensitive than traditional fluence sensors to coagulation-induced scattering changes. Radiance measurements take advantage of directional detection angles that are more receptive to the onset and passing of the coagulation boundary. We performed experiments with albumen phantoms to demonstrate the practicality of the radiance method for monitoring interstitial laser thermal therapy.
Chin
Lee C
LC
Department of Medical Biophysics, University of Toronto, Ontario Cancer Institute, Toronto M5G 2M9, Canada. chinl@uhnres.utoronto.ca
Wilson
Brian C
BC
Whelan
William M
WM
Vitkin
I Alex
IA
D000418:Albumins; D006801:Humans; D006979:Hyperthermia, Induced / Q000379:methods*; D017075:Laser Coagulation; D016343:Monitoring, Intraoperative; D019047:Phantoms, Imaging; D012542:Scattering, Radiation
D000418:Albumins