THE NECESSITY OF MEASURING THE SCATTER COEFFICIENT OF RADIOTHERAPY INSTRUMENTS

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SHOKRAIE P.; MONADI SH.

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Journal: Research in Medicine Year:2001 | Volume:25 | Issue:1 Page(s): 35-42

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Title

THE NECESSITY OF MEASURING THE SCATTER COEFFICIENT OF RADIOTHERAPY INSTRUMENTS

Author(s)

SHOKRAIE P. | MONADI SH. | Issue Writer Certificate

Keywords

SCATTER COEFFICIENTQ4

RADIOTHERAPYQ2

TUMORAL TISSUEQ4

Abstract

The major aim of RADIOTHERAPY is the definite therapy of the tumor while remaining the surrounding tissue intact. To meet this demand, the difference of administered dosage and transferred dosage should be less than 2%. To calculate the tumor dosage, RADIOTHERAPY instrument's output is measured for a reference field (10x10 cm2). This study has been carried out with the aim of surveying the necessity of using the SCATTER COEFFICIENT to convert the reference field output to other fields output used in RADIOTHERAPY.Total SCATTER COEFFICIENT, Scp, collimator, Sc, and phantom Sp were determined. Sc was measured in a cylindrical phantom prepared in this research, however, Scp was measured in a water phantom. Sp was calculated regarding Sc and Scp amounts. When the amount of collimator field was differing from that of phantom field, the accuracy of Scp separation method into Sc and Sp was assessed by comparing the amounts of Scp measured in blocked fields.Results have revealed that in case of not using SCATTER COEFFICIENT, for Satren linear accelerating beam of 12mv,the transferred dosage would differ from the administered dosage in a range of +15% ( in the biggest field) to -6% (in the smallest field). For calculating the dosage in blocked fields, the accuracy of separation method of Scp to Sc for collimator field and Sp for phantom field was confirmed (maximum deviation of experimental measurement was 1.3%). When using phantom field for Scp selection, the tumor dosage was 2.4-7.8% (27-90% for block) higher than the administered dosage for the beam of 12mv (error increased by block increasing or approximating the block to the center).

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APA: Copy

SHOKRAIE, P., & MONADI, SH.. (2001). THE NECESSITY OF MEASURING THE SCATTER COEFFICIENT OF RADIOTHERAPY INSTRUMENTS. PAJOUHESH DAR PEZESHKI, 25(1), 35-42. SID. https://sid.ir/paper/42009/en

Vancouver: Copy

SHOKRAIE P., MONADI SH.. THE NECESSITY OF MEASURING THE SCATTER COEFFICIENT OF RADIOTHERAPY INSTRUMENTS. PAJOUHESH DAR PEZESHKI[Internet]. 2001;25(1):35-42. Available from: https://sid.ir/paper/42009/en

IEEE: Copy

P. SHOKRAIE, and SH. MONADI, “THE NECESSITY OF MEASURING THE SCATTER COEFFICIENT OF RADIOTHERAPY INSTRUMENTS,” PAJOUHESH DAR PEZESHKI, vol. 25, no. 1, pp. 35–42, 2001, [Online]. Available: https://sid.ir/paper/42009/en

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