Assessment of image co-registration accuracy for frameless gamma knife surgery
- Authors
- Chung, Hyun-Tai; Kim, Jeong Hun; Kim, Jin Wook; Paek, Sun Ha; Kim, Dong Gyu; Chun, Kook Jin; Kim, Tae Hoon; Kim, Yong Kyun
- Issue Date
- 2-3월-2018
- Publisher
- PUBLIC LIBRARY SCIENCE
- Citation
- PLOS ONE, v.13, no.3
- Indexed
- SCIE
SCOPUS
- Journal Title
- PLOS ONE
- Volume
- 13
- Number
- 3
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/76767
- DOI
- 10.1371/journal.pone.0193809
- ISSN
- 1932-6203
- Abstract
- Image co-registration is used in frameless gamma knife radiosurgery (GKSRS) to assign a stereotactic coordinate system and verify patient setup before irradiation. The accuracy of co-registration with cone beam computed tomography (CBCT) images of a Gamma Knife Icon TM (GK Icon) was assessed, and the effects of the region of co-registration (ROC) were studied. CBCT-to-CBCT co-registration is used for patient setup verification, and its accuracy was examined by co-registering CBCT images taken at various configurations with a reference CBCT series. The accuracy of stereotactic coordinate assignment was investigated by co-registering stereotactic CT images with CBCT images taken at various configurations. An anthropomorphic phantom was used, and the coordinates of fifteen landmarks inside the phantom were measured. The co-registration accuracy between stereotactic magnetic resonance (MR) and CBCT images was evaluated using images from forty-one patients. The positions of the anterior and posterior commissures were measured in both a fiducial marker-based system and a co-registered system. To assess the effects of MR image distortions, co-registration was performed with four different ranges, and the accuracy of the results was compared. Co-registration between CBCT images gave a mean three-dimensional deviation of 0.2 +/- 0.1 mm. The co-registration of stereotactic CT images with CBCT images produced a mean deviation of 0.5 +/- 0.2 mm. The co-registration of MR images with CBCT images resulted in the smallest three-dimensional difference (0.8 +/- 0.3 mm) when a co-registration region covering the skull base area was applied. The image co-registration errors in frameless GKSRS were similar to the imaging errors of frame-based GKSRS. The lower portion of the patient's head, including the base of the skull, is recommended for the ROC.
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