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KMID : 1164220130250020167
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Journal of Korean Society for Radiotherapeutic Technology
2013 Volume.25 No. 2 p.167 ~ p.173
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A Study to Evaluate the Efficacy of CBCT and EXACTRAC on Spine Stereotactic Body Radiation Therapy
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Choi Woo-Keun
Park Su-Yeon
Park Do-Keun
Song Gi-Won
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Abstract
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Purpose: This study is to evaluate the efficacy of the CBCT and EXACTRAC the image on the spine stereotactic
body radiation treatment.
Materials and Methods: The study compared the accuracy of the dose distribution for changes in the real QA
phantom for The shape of the body of the phantom was performed. Novalis treatment artificially set up at the center
and to the right, on the Plan 1 mm, 2 mm, 3 mm in front 1 mm, 2 mm, 3 mm and upwards 1 mm, 2 mm, 3 mm
and 0.5o by moving side to side Exactrac error correction and error values of CBCT and plan changes on the dose
distribution were recorded and analyzed.
Results: Cubic Phantom of the experimental error, the error correction Exactrac X-ray 6D Translation in the direction
of the 0.18 mm, Rotation direction was 0.07o. Translation in the direction of the 3D CBCT 0.15 mm Rotation
direction was 0.04o. DVH dose distribution using the results of the AP evaluate the change in the direction of
change was greatest when moving.
Conclusion: ExacTrac image-guided radiation therapy with a common easy and fast to get pictures from all angles,
from the advantage of CBCT showed a potential alternative. But every accurate information compared with CT
treatment planning and treatment of patients with more accurate than the CBCT ExacTrac the location provided.
Changes in the dose distribution in the experiment results show that the treatment of spinal SBRT set up some
image correction due to errors at the target and enter the spinal cord dose showed that significant differences
appear.
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KEYWORD
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spine SBRT, CBCT, exactrac, efficacy
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