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KMID : 1164220070190010019
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Journal of Korean Society for Radiotherapeutic Technology
2007 Volume.19 No. 1 p.19 ~ p.26
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A Study on Calibration Procedures for Ir-192 High Dose Rate Brachytherapy Sources
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Baek Tae-Seong
Lee Seung-Wook
Na Soo-Kyung
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Abstract
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Purpose: To compare of the accuracy among various measurement procedures of HDR Brachytherapy, and to evaluate the clinical suitability and usefulness of alternative PMMA (polymethylmethacrylateplastics: ) plate phantom without any additional cost due to the purchase of measuring apparatus.
Materials and Methods: We made a comparative study on three types of measuring systems: well type chamber, source calibration jig, and PMMA plate phantom. Farmer type chamber was used for source calibration jig method and PMMA plate phantom method. Measurement was done 5 times each in comparison with the measurement values from manufacturer. Measurement results from experiment were compared with that from the manufacturer which is offered with the source whenever a source is substituted by a new one and evaluate the accuracy of source activity.
Results: As a consequence of Ir-192 source measurement using well type chamber, source calibration jig and PMMA plate phantom, RMS (Root Mean Square) values for the relative error are 0.6%, 1.57%, 2.1%, respectively, compared with the data from manufacturer. And the mean errors with standard deviation are given , , respectively.
Conclusion:From the results shown by the three types of measurement system (well type chamber, source calibration jig, and PMMA plate phantom), the measurement with well type chamber produced the best accuracy. It turns out that we can also use the alternative system of PMMA plate phantom clinically without purchasing any additional particular apparatus since the system does not exceed the recommendation of AAPM (American Association of Physicists in Medicine), which requires the error range of within .
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KEYWORD
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HDR brachytherapy, Ir-192 source measurement, PMMA plate phantom
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