An algorithm for stereotactic localization by computed tomography or magnetic resonance imaging

被引:7
作者
Dai, JR
Zhu, YP
Qu, HM
Hu, YM
机构
[1] St Jude Childrens Res Hosp, Dept Radiat Oncol, Memphis, TN 38105 USA
[2] SUNY Stony Brook, Ctr Visual Comp, Stony Brook, NY 11794 USA
[3] SUNY Stony Brook, Dept Comp Sci, Stony Brook, NY 11794 USA
[4] Canc Inst Hosp, Chinese Acad Med Sci, Dept Radiat Oncol, Beijing 100021, Peoples R China
关键词
D O I
10.1088/0031-9155/46/1/401
中图分类号
R318 [生物医学工程];
学科分类号
0831 ;
摘要
Stereotactic localization of an intracranial lesion by computed tomography or magnetic resonance imaging requires the use of a head frame that is fixed to the skull of the patient. To such head frames are attached either N-shaped or V-shaped localization rods. Because of patient positioning, the transverse imaging slices may not be parallel to the frame base; a coordinate transformation algorithm that takes this possibility into consideration is crucial. Here we propose such an algorithm for a head frame with V-shaped localization rods. Our algorithm determines the transformation matrix between the image coordinate system of a transverse image and the frame coordinate system. The determining procedure has three steps: (a) calculation of the oblique angles of a transverse image relative to the head frame and calculation of the image magnification factor; (b) determination of the coordinates of four central markers in both coordinate systems; and (c) determination of the 3 x 3 transformation matrix by using the coordinates of the four markers. This algorithm is robust in principle and is useful for improving the accuracy of localization.
引用
收藏
页码:N1 / N7
页数:7
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