10 MV X線不整形照射野における Field Factor について

概要

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In this report, we analyzed the field factors for the 10 MV X-ray irregular fields using a linear accelerator. We compared the field factors and TMRs at the same depth for two irregular fields of the same shape by means of (1) lead blocks and (2) installed multi-leaf collimator. There were no significant differences in either of the TMRs, and the TMRS were in good agreement with the TMR regarding their equivalent square field. On the other hand, there were significant differences in both the field factors, and the field factor for the lead block irregular fields were greater. From the results of this experiment, we are of the opinion that in routine dose calcultion, it is better to use field factors for the open fields in the case of the lead block irregular fields, and to use field factors for the equivalent square fields in the case of the irregular fields by means of multi-leaf collimator.
1986-07-01