Comparison of Dose Evaluation Index by Pencil Beam Convolution and Anisotropic Analytical Algorithm in Stereotactic Radiotherapy for Lung Cancer

• Published in: Japanese Journal of Radiological Technology Vol. 65; no. 7; pp. 938 - 944
• Main Authors: Tachibana, Masayuki, Noguchi, Yoshitaka, Fukunaga, Jyunichi, Hirano, Naomi, Yoshidome, Satoshi, Hirose, Takaaki
• Format: Journal Article
• Language: English; Japanese
• Published: Japan Japanese Society of Radiological Technology 20.07.2009
• Subjects: Adult; Aged; Aged, 80 and over; Algorithms; anisotropic analytical algorithm; batho power law; dose calculation algorithms; Female; Humans; inhomogeneity correction algorithm; Lung - radiation effects; Lung Neoplasms - radiotherapy; Male; Middle Aged; pencil beam convolution; Radiosurgery; Radiotherapy Dosage
• 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.