Author:
Yogo K.,Tatsuno Y.,Shimo T.,Noguchi Y.,Okudaira K.,Nozawa M.,Ishiyama H.,Yasuda H.,Oguchi H.,Yamamoto S.
Abstract
Abstract
Quality assurance (QA) of the source movement is essential
for ensuring the safe delivery of high-dose-rate (HDR)
brachytherapy. Here, we proposed a simple and effective method for
real-time tracking of the source movement in high-dose-rate
brachytherapy based on Cherenkov emission imaging. The Cherenkov
light emitted from water irradiated by 192Ir-source
γ-rays was captured using a high-sensitivity video
camera. The source positions and dwell intervals were determined
from the light images and compared with the preset values. The
source dwell times and transit speeds were measured from the time
course of the source positions. The brightness profiles were
compared with the dose distributions provided by the treatment
planning system. The source movements were visualized in real time
as a movie of Cherenkov light emissions. The source positional
intervals measured from the Cherenkov emission images agreed well to
the preset values within 0.3 mm. The source dwell times were
comparable to the preset values within 0.2 s, and the transit
speeds were similar to those of previous reports. The brightness
distributions agreed with the dose distributions within
approximately 40%, except near the source center. The proposed
Cherenkov method has good potential for tracking the source movement
in real time in brachytherapy, as it could enable simultaneous
measurements of the source positions, dwell times, and dose
distributions.
Subject
Mathematical Physics,Instrumentation
Cited by
2 articles.
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