Evaluation of Six-Dimensional Cranial Target Positioning Accuracy in Two Different Immobilization Methods Using Exactrac System

Publish Year: 1399
نوع سند: مقاله ژورنالی
زبان: English
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JR_IJMP-17-5_005

تاریخ نمایه سازی: 19 دی 1399

Abstract:

Introduction: The aim of this study was to determine the accuracy of two different immobilization methods in patient positioning in cranial radiotherapy. The six-dimensional (6D) target localization accuracy of using a dedicated stereotactic mask was compared with that of a conventional head mask by the ExacTrac system. Material and Methods: A total of 56 patients with cranial lesions were included in this study (26 patients with a dedicated stereotactic mask and 30 subjects with a conventional head mask). The ExacTrac image-guided positioning system was utilized to obtain daily translational and rotational patient positioning displacement from the intended position. The 6D setup data was analyzed to obtain population mean, systematic and random errors, and three-dimensional (3D) vector shifts in all the patients. Results: The population mean values of setup errors were comparable with both immobilization systems; however, the spread as indicated by population systematic and population random errors was more in the use of a conventional head mask. The mean values of the 3D vector shifts were 2.09±1.00 and 4.51±3.38 mm with the use of a dedicated stereotactic mask and conventional head mask, respectively. The frequency distribution of maximum rotational deviation and statistical analysis demonstrated a significant difference in immobilization accuracy between stereotactic immobilization and 3-clamp immobilization (p <0.05). Conclusion: The results revealed that there was a significant reduction in target positioning errors with a dedicated stereotactic mask, compared to that with a conventional cranial mask. Furthermore, a dedicated stereotactic mask is required to keep rotational deviations within system correctable limits.

Authors

Tamil Selvan Kasirajan

Department of oncology, Medical Physicist, Apollo Cancer Hospital, Hyderabad, INDIA

Padma Ganesan

Medical Physicist, Department of Oncology, Apollo Cancer Hospital,Hyderabad, Telangana,INDIA

Revathy Murugesan Kesavan

Chief Medical Physicist,Department of Oncology, Apollo Cancer Hospital,Hyderabad, Telangana,INDIA

Arunai Nambi Raj N

Professor, Centre for Biomaterials, cellular &amp; Molecular Theranostics, VIT University, Vellore,Tamilnadu, INDIA

Senthilnathan K

Professor, Department of Physics, School of Advanced Sciences, VIT university, Vellore, Tamilnadu, INDIA

Ramesh Babu P

Professor, Department of physics, School pf Advanced Sciences, VIT University,Vellore, Tamilnadu,INDIA

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