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Information Journal Paper

Title

CALCULATION OF PERCENT DEPTH DOSES AT DIFFERENT POINTS UNDER A STEP- FILTER USING CLARKSON METHOD

Pages

  69-77

Abstract

 Introduction: Dosimetry of radiotherapy treatment beams is a very important procedure because successful radiation therapy requires an accurate delivery of dose to a cancerous volume of tissue. CLARKSON METHOD is an important and efficient procedure in radiotherapy. It is used to calculate the PDD (PERCENT DEPTH DOSE) at open portion of irregular fields which are partially blocked. This method is not applicable in cases such as the calculation of PDD under points that are partially or fully blocked or are under beam attenuators like wedge filters. The aim of this study is to calculate the PDD for points under a step-filter by the use of CLARKSON METHOD. In order for the PDD under the step-filter to be considered as PDD in a wedged field the number of steps in the filter should be sufficient.Materials and Methods: The PDDs were calculated with different step-filters with sizes: 8. 8, 8. 10, 8. 12, 8. 14, 8. 16cm2 in Cobalt-60 fields, the depths of calculations were: 5, 10, 15, 20 cm. In this research, the calculated and measured values of (PDD)d=5 / (PDD)d=15  and (PDD)d=10 / (PDD)d=20 were compared. A software Microsoft Excel 2000 was used for calculation. Dose measurements were carried out in a water phantom by a Farmer type ionization chamber.Results: The differences between the calculated and measured (PDD)d=5 / (PDD)d=15 and (PDD)d=10 / (PDD)d=20 were determined and the average of the absolute values were calculated as: 0.3861, 0.3347, 0.2381, 0.2416 _ and 0.3293 which were related to fields: 8. 8to 8. 16 cm2 respectively. This value for all fields is equal to 0.3059.Discussion: With respect to lack of a strict formula for the calculation of the PERCENT DEPTH DOSE under wedge filter, the presented formula could be used to save time in the treatment planning.

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    APA: Copy

    TAHMASBI BEYRGANI, M.J., GHORBANI, M., & ANSARI, M.. (2005). CALCULATION OF PERCENT DEPTH DOSES AT DIFFERENT POINTS UNDER A STEP- FILTER USING CLARKSON METHOD. IRANIAN JOURNAL OF MEDICAL PHYSICS, 2(6), 69-77. SID. https://sid.ir/paper/96912/en

    Vancouver: Copy

    TAHMASBI BEYRGANI M.J., GHORBANI M., ANSARI M.. CALCULATION OF PERCENT DEPTH DOSES AT DIFFERENT POINTS UNDER A STEP- FILTER USING CLARKSON METHOD. IRANIAN JOURNAL OF MEDICAL PHYSICS[Internet]. 2005;2(6):69-77. Available from: https://sid.ir/paper/96912/en

    IEEE: Copy

    M.J. TAHMASBI BEYRGANI, M. GHORBANI, and M. ANSARI, “CALCULATION OF PERCENT DEPTH DOSES AT DIFFERENT POINTS UNDER A STEP- FILTER USING CLARKSON METHOD,” IRANIAN JOURNAL OF MEDICAL PHYSICS, vol. 2, no. 6, pp. 69–77, 2005, [Online]. Available: https://sid.ir/paper/96912/en

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