Modified dose difference method for comparing dose distributions
نویسنده
چکیده
I would like to comment on the article by Jino Bak, Jin Hwa Choi, Jae-Sung Kim, and Suk Won Park, “Modified dose difference method for comparing dose distributions,” J. Appl. Clin. Med. Phys. 2012; 13(2): 73-80. Something almost identical to their method was in fact first described by Bakai et al.(1) who called their dimensionless index χ. While it is true that Bak et al. refer to this work in Reference 13, the authors do so in a list of variations on the γ index. However, γ indices involve a search over dose and spatial coordinates, while χ is a gradient-dependent function like theirs, and I do not think that they properly acknowledge the similarity. The difference between their “modified dose” index and χ lies in the dimensionless parameter β, described in their Eq. (1) as:
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