Evaluation of Setup Uncertainties for Single-Fraction SRS by Comparing Two Different Mask-Creation Methods

Title
Evaluation of Setup Uncertainties for Single-Fraction SRS by Comparing Two Different Mask-Creation Methods
Author(s)
김응찬백종근장현수[장현수]오영기[오영기]이현정
Keywords
BEAM COMPUTED-TOMOGRAPHY; STEREOTACTIC RADIOSURGERY; BRAIN METASTASES; FIXATION SYSTEM; RADIOTHERAPY; ACCURACY; FRAMELESS; IMMOBILIZATION; CT
Issue Date
201507
Publisher
KOREAN PHYSICAL SOC
Citation
JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.67, no.1, pp.38 - 43
Abstract
The purpose of this study was to evaluate the setup uncertainties for single-fraction stereotactic radiosurgery (SF-SRS) based on clinical data with two different mask-creation methods using pretreatment con-beam computed tomography imaging guidance. Dedicated frameless fixation BrainLAB masks for 23 patients were created as a routine mask (R-mask) making method, as explained in the BrainLAB's user manual. Alternative masks (A-masks), which were created by modifying the cover range of the R-masks for the patient's head, were used for 23 patients. The systematic errors including these for each mask and stereotactic target localizer were analyzed, and the errors were calculated as the means +/- standard deviations (SD) from the left-right (LR), superior-inferior (SI), anterior-posterior (AP), and yaw setup corrections. In addition, the frequencies of the three-dimensional (3D) vector length were analyzed. The values of the mean setup corrections for the R-mask in all directions were < 0.7 mm and < 0.1., whereas the magnitudes of the SDs were relatively large compared to the mean values. In contrast, the means and SDs of the A-mask were smaller than those for the R-mask with the exception of the SD in the AP direction. The means and SDs in the yaw rotational direction for the R-mask and the A-mask system were comparable. 3D vector shifts of larger magnitude occurred more frequently for the R-mask than the A-mask. The setup uncertainties for each mask with the stereotactic localizing system had an asymmetric offset towards the positive AP direction. The A-mask-creation method, which is capable of covering the top of the patient's head, is superior to that for the R-mask, so the use of the A-mask is encouraged for SF-SRS to reduce the setup uncertainties. Moreover, careful mask-making is required to prevent possible setup uncertainties.
URI
http://hdl.handle.net/YU.REPOSITORY/31585http://dx.doi.org/10.3938/jkps.67.38
ISSN
0374-4884
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이과대학 > 물리학과 > Articles
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