Kulasekere Ravi, Moran Jean M, Fraass Benedick A, Roberson Peter L
Department of Radiation Oncology, University of Michigan Medical Center, Ann Arbor, Michigan 48109-0010, USA.
J Appl Clin Med Phys. 2006 May 25;7(2):86-95. doi: 10.1120/jacmp.v7i2.2202.
A single calibration film method was evaluated for use with intensity-modulated radiation therapy film quality assurance measurements. The single-film method has the potential advantages of exposure simplicity, less media consumption, and improved processor quality control. Potential disadvantages include cross contamination of film exposure, implementation effort to document delivered dose, and added complication of film response analysis. Film response differences were measured between standard and single-film calibration methods. Additional measurements were performed to help trace causes for the observed discrepancies. Kodak X-OmatV (XV) film was found to have greater response variability than extended dose range (EDR) film. We found it advisable for XV film to relate the film response calibration for the single-film method to a user-defined optimal calibration geometry. Using a single calibration film exposed at the time of experiment, the total uncertainty of film response was estimated to be <2% (1%) for XV (EDR) film at 50 (100) cGy and higher, respectively.
对一种单校准胶片方法进行了评估，以用于调强放射治疗胶片的质量保证测量。单胶片方法具有曝光简单、介质消耗少以及改善处理器质量控制等潜在优势。潜在的缺点包括胶片曝光的交叉污染、记录所输送剂量的实施工作以及胶片响应分析的额外复杂性。测量了标准校准方法和单胶片校准方法之间的胶片响应差异。进行了额外的测量，以帮助追踪观察到的差异的原因。发现柯达X-OmatV（XV）胶片比扩展剂量范围（EDR）胶片具有更大的响应变异性。我们发现，对于XV胶片，将单胶片方法的胶片响应校准与用户定义的最佳校准几何形状相关联是可取的。使用在实验时曝光的单校准胶片，估计在50（100）cGy及更高剂量下，XV（EDR）胶片的胶片响应总不确定度分别<2%（1%）。
