EVALUATIONS OF ACCURACY AND REPRODUCIBILITY OF TELE-RADIOTHERAPY DOSES BY IN VIVO DOSIMETRY

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TAKAVAR A.; NIKOU FAR A.; MAHDAVI S.R.

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Journal: IRANIAN JOURNAL OF MEDICAL PHYSICS Year:2003 | Volume:1 | Issue:1 Page(s): 9-17

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Title

EVALUATIONS OF ACCURACY AND REPRODUCIBILITY OF TELE-RADIOTHERAPY DOSES BY IN VIVO DOSIMETRY

Author(s)

TAKAVAR A. | NIKOU FAR A. | MAHDAVI S.R. | Issue Writer Certificate

Keywords

IN-VIVO DOSIMETRYQ3

ACCURACYQ3

REPRODUCIBILITYQ2

QUALITY ASSURANCEQ4

RADIOTHERAPYQ4

Abstract

Background: In RADIOTHERAPY IN-VIVO DOSIMETRY is an effective method of QUALITY ASSURANCE (QA) in order to check the patient irradiation, position and overall treatment procedure. Measuring of ACCURACY and REPRODUCIBILITY of entrance doses and transmission ratios are an important part in QA program. ACCURACY should lie between ±5% of prescribed dose as recommended by ICRU. Object of this study was QA of two newly installed and operating Cobalt -60 units. Methods and Material: In this research QA has been performed on two Cobalt-60 teleradiotherapy, THERATRON machines manufactured by AECL of CANADA, using ionization chamber (IC) and thermoluminescent dosimeters.(TLD). Results of each treatment field measurement by both dosimeters were compared with those of prescribed doses. Results Deviations measured by IG and TLD were ±0.56 % and ±3.79% of prescribed doses respectively. The mean deviations of REPRODUCIBILITY for seven treatment fields measured by IC and TLD were 0.83% and 15%. Mean deviations of measured transmission ratios from calculated ratios in both cobalt machines were 2.55% and 12.2% for IC and TLD respectively. The reproducibilities of treatment fields were measured 2.46% by IC and 23% by TLD. Discussion: Relatively fair ACCURACY (±4%) obtained in this study shows a good stability and functionality of therapy irradiators. Very low differences between measured and prescribed doses, indicating accurate routine calculations in physics section. Evaluating ACCURACY and REPRODUCIBILITY of transmission ratios can be used for tissue inhomogeneity correction. Using TLD needs special considerations regarding thermal heating and calibration.

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APA: Copy

TAKAVAR, A., NIKOU FAR, A., & MAHDAVI, S.R.. (2003). EVALUATIONS OF ACCURACY AND REPRODUCIBILITY OF TELE-RADIOTHERAPY DOSES BY IN VIVO DOSIMETRY. IRANIAN JOURNAL OF MEDICAL PHYSICS, 1(1), 9-17. SID. https://sid.ir/paper/96868/en

Vancouver: Copy

TAKAVAR A., NIKOU FAR A., MAHDAVI S.R.. EVALUATIONS OF ACCURACY AND REPRODUCIBILITY OF TELE-RADIOTHERAPY DOSES BY IN VIVO DOSIMETRY. IRANIAN JOURNAL OF MEDICAL PHYSICS[Internet]. 2003;1(1):9-17. Available from: https://sid.ir/paper/96868/en

IEEE: Copy

A. TAKAVAR, A. NIKOU FAR, and S.R. MAHDAVI, “EVALUATIONS OF ACCURACY AND REPRODUCIBILITY OF TELE-RADIOTHERAPY DOSES BY IN VIVO DOSIMETRY,” IRANIAN JOURNAL OF MEDICAL PHYSICS, vol. 1, no. 1, pp. 9–17, 2003, [Online]. Available: https://sid.ir/paper/96868/en

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