Journal of Medical Physics
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Year : 2005  |  Volume : 30  |  Issue : 1  |  Page : 32-35

In-vivo (Entrance) Dose Measurements In External Beam Radiotherapy With Aqueous FBX Dosimetry System

Correspondence Address:
M K Semwal

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Source of Support: None, Conflict of Interest: None

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FBX aqueous chemical dosimetry system has been found useful in radiotherapy owing to its low dose measuring capability. In the present work, entrance dose measurements in external beam radiotherapy on a telecobalt machine were carried out with the system on 100 patients. Treatments involving simple beam arrangement of open parallel-opposed beams in cranial and pelvic irradiations were selected for this study. In place of a spectrophotometer, a simple and inexpensive colorimeter was used for absorbance measurements. The purpose was to assess the efficacy of the FBX system for in-vivo dose measurements. The results obtained show that the average discrepancy between the measured and expected dose for both categories of patients was 0.2% (standard deviation 3.2%) with a maximum of +10.3%. There were 5.5% cases showing more than +5% discrepancy. Comparison of the result obtained with published work on entrance dose measurements, with diode detectors, shows that the inexpensive FBX system can be used for in-vivo (entrance) dose measurements for simple beam arrangements in radiotherapy and can thus serve as a useful QA tool.

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