Study the Calibration of the High Dose Rate Brachytherapy Radioactive Source 60Co

Aim of this work is to calibrate the high dose rate (HDR) brachytherapy source 60Co. The radioactive source calibration is a very important part of the quality assurance program for dosimetry of brachytherapy source. The goal of this project is the calibration of HDR Brachytherapy source in radiation therapy is the measurement of the air kerma rate which required actual dose to deliver. The source calibration is an essential part of the quality assurance program for dosimetry of brachytherapy source. This research will help the patient who is involving brachytherapy treatment. HDR brachytherapy source 60Co is inserted directly or in close to the tumor. Most commonly using method for calibration of HDR brachytherapy source 60CO is well type ionization chamber. Calibration of the radioactive source 60Co brachytherapy source is very important for the treatment of cancer patient. We have got the variation between RAKR from TPS and measured Air Kerma Rate of 60Co brachytherapy source are 3.2% and 3.04% and which give very good agreement with the Air Kerma Rate (RAKR) is 5% (from BEBIG protocol, Germany). So, our results were satisfied for brachytherapy treatment. From these results, it must be concluded that, 60Co brachytherapy source is suitable for brachytherapy cancer treatment. It is very difficult to calculate treatment deliver dose without calibrating AKR of HDR brachytherapy source. It is very important to verify the calculated Air Kerma Rate by TPS Air Kerma Rate.

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SU-G-201-01: An Automated Treatment Plan Quality Assurance Program for High-Dose Rate (HDR) Brachytherapy with a VaginalCylinder Applicator

Medical Physics ◽

10.1118/1.4956874 ◽

2016 ◽

Vol 43 (6Part24) ◽

pp. 3622-3623

Author(s):

Y Zhou ◽

J Tan ◽

S Jiang ◽

K Albuquerque ◽

X Jia

Keyword(s):

Quality Assurance ◽

Dose Rate ◽

Treatment Plan ◽

High Dose Rate ◽

Quality Assurance Program ◽

High Dose ◽

Hdr Brachytherapy ◽

Plan Quality

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Determination of contributions of scatter and distance error to the source strength of 192Ir HDR brachytherapy source

Polish Journal of Medical Physics and Engineering ◽

10.1515/pjmpe-2016-0010 ◽

2016 ◽

Vol 22 (3) ◽

pp. 55-59

Author(s):

Shwetha Bondel ◽

Manickam Ravikumar

Keyword(s):

High Dose Rate ◽

High Dose ◽

Hdr Brachytherapy ◽

Iterative Technique ◽

Distance Measurements ◽

Distance Method ◽

Distance Error ◽

Air Kerma ◽

Air Kerma Rate ◽

Brachytherapy Source

Abstract High dose rate (HDR) brachytherapy commonly employs a 192Ir encapsulated source to deliver high dose to the malignant tissues. Calibrations of brachytherapy sources are performed by the manufacturer using a well-type chamber or by in-air measurement using a cylindrical ionization chamber. Calibration using the latter involves measurements to be carried out at several distances and room scatter can also be determined. The aim of the present study is to estimate the scatter contribution from the walls, floor and various materials in the room in order to determine the reference air kerma rate of an 192Ir HDR brachytherapy source by in-air measurements and also to evaluate the error in the setup distance between the source centre and chamber centre. Air kerma measurements were performed at multiple distances from 10 cm to 40 cm between the source and chamber. The room scatter correction factor was determined using the iterative technique. The distance error of −0.094 cm and −0.112 cm was observed for chamber with and without buildup cap respectively. The scatter component ranges from 0.3% to 5.4% for the chamber with buildup cap and 0.3% to 4.6% without buildup cap for distances between 10 to 40 cm respectively. Since the average of the results at multiple distances is considered to obtain the actual air kerma rate of the HDR source, the seven distance method and iterative technique are very effective in determining the scatter contribution and the error in the distance measurements.

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