肺定位放射線治療におけるPencil Beam Convolution法およびAnisotropic Analytical Algorithm法による線量評価指標の比較

• Published in: 日本放射線技術学会雑誌 Vol. 65; no. 7; pp. 938 - 944
• Main Authors: 橘, 昌幸, 野口, 佳孝, 福永, 淳一, 平野, 奈緒美, 吉留, 郷志, 廣瀬, 貴章
• Format: Journal Article
• Language: Japanese
• Published: 公益社団法人 日本放射線技術学会 2009
• Subjects: anisotropic analytical algorithm; batho power law; dose calculation algorithms; inhomogeneity correction algorithm; pencil beam convolution
• ISSN: 0369-4305; 1881-4883
• DOI: 10.6009/jjrt.65.938

We previously studied dose distributions of stereotactic radiotherapy (SRT) for lung cancer. Our aim is to compare in combination pencil beam convolution with the inhomogeneity correction algorithm of Batho power low [PBC (BPL)] to the anisotropic analytical algorithm (AAA) by using the dose evaluation indexes. There were significant differences in D95, PTV mean dose, homogeneity index, and conformity index, V10, and V5. The dose distributions inside the PTV calculated by PBC (BPL) were more uniform than those of AAA. There were no significant differences in V20 and mean dose of total lung. There was no large difference for the whole lung. However, the surrounding high-dose region of PTV became smaller in AAA. The difference in dose evaluation indexes extended between PBC (BPL) and AAA that as many as low CT value of lung. When the dose calculation algorithm is changed, it is necessary to consider difference dose distributions compared with those of established practice.