Journal of Medical Physics
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Year : 2001  |  Volume : 26  |  Issue : 2  |  Page : 51-59

Acceptance Testing And Commissioning Of Ximatron Radiotherapy Simulator



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B Paul Ravindran


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Though it is well understood that success of radiotherapy involves correct treatment, simulation and accurate patient positioning, the quality assurance of radiotherapy simulator receives little attention. A radiotherapy simulator combines the technology from therapeutic and diagnostic radiology, and hence it needs to be tested for both. In this paper, the authors describe the methods adopted in carrying out the acceptance testing and quality assurance of a Varian Ximatron simulator' prior to its commissioning. Pre-commissioning and quality assurance programs consisted of verification of (i) mechanical and optical parameters, (ii) parameters associated with x-ray beam, (iii) performance of image intensifier, and (iv) parameters related to quality assurance and radiation protection. The check on mechanical and optical parameters included the verification of mechanical and optical read outs, field congruence, isocentre accuracy and accuracy of programmed functions, such as auto-stop. The x-ray beam parameters were verified for kV, MAs, consistency of radiation output and accuracy of timer. The image intensifier performance was checked with respect to resolution, gray image resolution and low contrast sensitivity. The functions of safety interlock for collision were also checked.


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