MEASUREMENT OF DOSE DISTRIBUTION USING POLYMER GEL FOR POTENTIAL VERIFICATION OF A TREATMENT PLANNING SYSTEM

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FARAJ ELAHI A.R.; PIRAYESH ISLAMIAN J.; SAIDPOUR H.

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Journal: PHARMACEUTICAL SCIENCES Year:2004 | Volume:- | Issue:2 Page(s): 31-40

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Title

MEASUREMENT OF DOSE DISTRIBUTION USING POLYMER GEL FOR POTENTIAL VERIFICATION OF A TREATMENT PLANNING SYSTEM

Author(s)

FARAJ ELAHI A.R. | PIRAYESH ISLAMIAN J. | SAIDPOUR H. | Issue Writer Certificate

Keywords

GEL DOSIMETRYQ3

DOSE DISTRIBUTIONQ3

DOSIMETRYQ3

TREATMENT PLANNINGQ3

Abstract

Introduction of polymer gel as a dosimeter and its unique advantages in measuring DOSE DISTRIBUTIONs opens up some important applications in radiotherapy. This paper will discuss the performance of the gel dosimeter in measurements associated with external beam treatment, which is the most common form of radiotherapy. The central axis depth dose was measured in a cylindrical Perspex of 150mm in diameter. Irradiation was made using radiation field of 5x5 and 8x8 cm and the results compared with data obtained using a small ionization chamber. The investigation was also made to measure DOSE DISTRIBUTION resulting from a three, four field irradiation, oblique incidence and an inhomogeneous gel. Comparison was made with the plan produced by Helax planning system simulating the experimental condition using "Pips". The percentage depth dose on the central axis in both 5x5 and 8 x 8 radiation fields have shown good agreement with ion chamber within ±4%. For 50% isodose a comparison of dose arease in the gel and Helax in three- field radiation resulted in agreement within ±4% using Pips. DOSE DISTRIBUTION produced in the gel for four fields agreed within ±2.7% to 5% up to isodose level of 70% and ±8% at 60% compared to Helax. The measurements of isodose levels for different radiation field in the case of an air gap indicated reasonably good agreement between gel and plan from Helax at the 90% dose level. The produced DOSE DISTRIBUTIONs from the 30° obique beam have shown large differences of about 10 mm in 90 to 70% in the Perspex phantom but agree well in the glass phantom. The results have indicated the depth dose and DOSE DISTRIBUTIONs from standard radiotherapy techniques produced in the gel agree with ion chamber and also basic DOSE DISTRIBUTIONs produced by Helax. The gel performance for measurements using an air gap in the phantom was quite encouraging.

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APA: Copy

FARAJ ELAHI, A.R., PIRAYESH ISLAMIAN, J., & SAIDPOUR, H.. (2004). MEASUREMENT OF DOSE DISTRIBUTION USING POLYMER GEL FOR POTENTIAL VERIFICATION OF A TREATMENT PLANNING SYSTEM. PHARMACEUTICAL SCIENCES, -(2), 31-40. SID. https://sid.ir/paper/48485/en

Vancouver: Copy

FARAJ ELAHI A.R., PIRAYESH ISLAMIAN J., SAIDPOUR H.. MEASUREMENT OF DOSE DISTRIBUTION USING POLYMER GEL FOR POTENTIAL VERIFICATION OF A TREATMENT PLANNING SYSTEM. PHARMACEUTICAL SCIENCES[Internet]. 2004;-(2):31-40. Available from: https://sid.ir/paper/48485/en

IEEE: Copy

A.R. FARAJ ELAHI, J. PIRAYESH ISLAMIAN, and H. SAIDPOUR, “MEASUREMENT OF DOSE DISTRIBUTION USING POLYMER GEL FOR POTENTIAL VERIFICATION OF A TREATMENT PLANNING SYSTEM,” PHARMACEUTICAL SCIENCES, vol. -, no. 2, pp. 31–40, 2004, [Online]. Available: https://sid.ir/paper/48485/en

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