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KMID : 0384620090200010014
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Korean Journal of Medical Physics
2009 Volume.20 No. 1 p.14 ~ p.20
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Analysis of Dose Distribution on Critical Organs for Radiosurgery with CyberKnife Real-Time Tumor Tracking System
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Huh Hyun-Do
Kim Woo-Chul
Choi Jin-Ho
Kim Seong-Hoon
Ji Young-Hoon
Kim Kum-Bae
Lee Re-Na
Choi Sang-Hyoun
Kim Hun-Jeong
Shin Dong-Oh
Lee Sang-Hoon
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Abstract
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We measured the dose distribution for spinal cord and tumor using Gafchromic film, applying 3D and 4D-Treatment Planning for lung tumor within the phantom. A measured dose distribution was compared with a calculated dose distribution generated from 3D radiation treatment planning and 4D radiation treatment planning system. The agreement of the dose distribution in tumor for 3D and 4D treatment planning was 90.6%, 97.64% using gamma index computed for a distance to agreement of 1 mm and a dose difference of 3%. However, a gamma agreement index of 3% dose difference tolerence of and 2 mm distance to agreement, the accordance of the dose distribution around cord for 3D and 4D radiation treatment planning was 57.13%, 90.4%. There are significant differences between a calculated dose and a measured dose for 3D radiation treatment planning, no significant differences for 4D treatment planning. The results provide the effectiveness of the 4D treatment planning as compared to 3D. We suggest that the 4-dimensional treatment planning should be considered in the case where such equipments as Cyberknife with the real time tracking system are used to treat the tumors in the moving organ.
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KEYWORD
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4D planning, Synchrony, CyberKnife
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