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Design and Study of In-House Software Based Automatic Real Time Dwell Time and Dwell Position Calculating Prototype Device for HDR Brachytherapy

SENTHILKUMAR SHANMUGAM, Madurai Medical College & Govt. Rajaji Hospital, Madurai, Tamilnadu, INDIA.


(Sunday, 7/29/2018) 3:00 PM - 6:00 PM

Room: Exhibit Hall

Purpose: The purpose of this study was to develop in-house software based automatic dwell time and dwell position calculating prototype HDR quality assurance device.

Methods: The prototype HDR QA device consist of in-house software, laptop, webcamera, light tight box and a fluorescent screen. When the HDR source moving on the fluorescent screen the gamma photons converted into light photon by the fluorescent screen. The visible lights indicates the real time positioning of the source. The visible light signal was recorded by the web camera, which was placed in the top of the light tight box. The software automatically calculate and determine the distance between the successive dwell positions. For timing measurements, individual images from the video signal were similarly processed to identify the location of the source. Source actual dwell time was calculated from number of images, which indicated the source at the corresponding position. The total transit time was measured by subtracting source stationary time from total dwell time.

Results: Indigenously developed device was able to successfully perform positioning and timing QA measurements automatically and the movement of the source can be seen in the computer screen in the control console. Advantages of my technique is its fast and precise positional verification, ability to visually check source treatment for safety checks and eliminating confusion of distance between physical end of the catheter and center of the source.

Conclusion: The system can be implemented in an automated fashion leading to reduced time and effort and increasing the resolution, accuracy and repeatability of measurements. The positioning and dwell time procedures can be stored for all the patient and machine QA, which can be able to rerun the recorded information anytime for the verification. Future directions will include expanding the capability of the system to provide dosimetry information in mobile apps.


Not Applicable / None Entered.


Not Applicable / None Entered.

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