Imaging of HDR brachytherapy dose distributions using NMR Fricke-gelatin dosimetry.
The application of NMR Fricke-gelatin dosimetry to the imaging of dose distributions around high dose rate (HDR) radioactive Ir-192 seeds in brachytherapy is presented. The duration of the irradiations required to give changes of the Fricke-gelatin NMR characteristics, which were readily detected by the magnetic resonance imager, typically ranged from 4 to 25 min for single source and multiple source (33 source positions distributed among three catheters) geometries, respectively. A fast approach for determining radiation dose from MR image intensity using a calibration curve is described. NMR Fricke-gel dosimetry is shown to be a viable means of verifying the dose distributions from brachytherapy sources.
Department of Oncology (Radiation Oncology), McGill University, Montreal, Quebec, Canada.
L J
LJ
Schreiner
I
I
Crooks
M D
MD
Evans
B M
BM
Keller
W A
WA
Parker
D001918:Brachytherapy; D007496:Iridium Radioisotopes / Q000627:therapeutic use; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008961:Models, Structural; D011829:Radiation Dosage
D007496:Iridium Radioisotopes