KMID : 1164219970090010025
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Journal of Korean Society for Radiotherapeutic Technology 1997 Volume.9 No. 1 p.25 ~ p.28
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Isocenter Verification Using Linac-Gram Films Taken with Angiolocalizer : Improved Quality Assurance of Fractionated Stereotactic Radiation Therapy(FSRT)
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Cho Jung-Keun
Park Young-Hwan Ju Sang-Gyu Kim Young-Kon
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Abstract
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With the advances in radiation therapy technology and equipment, the need for more accurate and safer radiation delivery to the target region has been continuously growing. Stereotactic Radiosurgery(SRS) is a good example of but has a substantial risk of causing severe late neurological damages. Fractionated Stereotactic Radiation Therapy(FSRT) is a modification of SRS enabling conventional fractionation with maintaining accuracy using noninvasive and relocatable frame. Verification of mechanical accuracy in FSRT has been done according to the manufacture¡¯s recommendations using RLPP, LTLF, and Depth-helmet. In order to reinforce this, we have developed additional novel verification procedure using Linac-grams with the Angiolocalizer attached on the GTC frame, which are then digitized into the planning software(X-Knife) to generate the three dimensional coordinates for cmoparison. This method has been successful in such ways that the anatomical landmarks are identifiable on the Linac-gram films and that the serial comparisons of the stereotactic coordinates of the isocenter are possible with more certainty a along the FSRT course than before.
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KEYWORD
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FSRT, SRS, isocenter, verification, angloiocalizer, L-gram
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