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EVALUATION OF THE COLLISION WARNING CAPABILITY OF GAMMA KNIFE RADIOSURGERY PLANNING SYSTEM BASED ON THE COORDINATES OF THE IRRADIATION POINT AND THE LENGTH OF THE POST AND SCREWS OF STEREOTACTIC FRAME
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Abstract
Background: Currently, the number of patients with brain tumors treated with Gamma Knife radiosurgery is increasing. In many cases, the patient has a tumor in the frontal or occipital lobe or both, which will make it difficult to position the patient's stereotactic frame because the LGP radiosurgery planning system may warn of a collision, causing a collision. Radiosurgery plans will have to be adjusted and changed, leading to unexpected results. In this report, we conduct statistics and analyze the locations of tumors that are prone to collision warnings, as well as build the coordinates of the irradiation points (shots). The collision warning plan corresponds to the size of the posts and screws of the stereotactic frame. Methods: We conducted a descriptive statistical study on 79 patients whose LGP system had collision warnings from November 2022 to October 2023. Patients are planned for radiosurgery on computer software, and will have a stereotactic frame placed, then we measure and enter the indexes of the frame on the patient's head into the LGP software, the measurements of four The post includes: anterior - left, anterior - right, posterior - left, posterior - right and the protruding part of the screws. LGP will then provide collision warnings of shots in the plan and collided objects. Results: We had 79 plans with collision warnings, 10 (12.7%) had both anterior and posterial post collision warnings; and 69 cases (87.3%) alerted 1 subject (anterior or posterial); Of the total 214 shots with collision warnings, 166 shots were in the frontal lobe (77.6%) and 48 shots were in the occipital lobe (22.4%). The average coordinates of the shot impacting the AL post are (73.05; 33.63; 96.13); with AR post is (123.55; 29.54; 96.22); with PL post is (73.67; 168.94; 83.08); with PR post being (133.53; 163.78; 78.69). Conclusion: The results have found locations of brain metastases where irradiation points are prone to collisions. Research and create shot coordinates that have a high risk of collision warning
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Keywords
Gamma knife, stereotactic radiosurgery collision warning, stereotactic frame.
References
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