Frameless stereotaxic integration of CT imaging data: accuracy and initial applications.
To evaluate the spatial accuracy of a rapid interactive method of transferring computed tomographic (CT) information between its display on a computer screen to its source (test object, operating field), a multidimensional computer combined with a six-jointed position-sensing mechanical arm was tested with a Plexiglas model consisting of 50 rods of varied height and known location, a plastic replica of the skull, and, subsequently, three patients. The median error value between image and real location was 1-2 mm (P > .95), regardless of the registration target sites. The accuracy, however, increased with the selection of widespread registration points, and 95% of all errors were below 3.70 mm (P > .95). The results compare favorably with the four most commonly used stereotaxic framed units. A misregistration error of 0.3-2.2 mm was found during intraoperative correlation between anatomy on the CT display and actual anatomic location in the operative field.
Zinreich
S J
SJ
Department of Neuroradiology, Johns Hopkins Medical Institutions, Baltimore, MD 21205.
Tebo
S A
SA
Long
D M
DM
Brem
H
H
Mattox
D E
DE
Loury
M E
ME
vander Kolk
C A
CA
Koch
W M
WM
Kennedy
D W
DW
Bryan
R N
RN
D002648:Child; D005260:Female; D006258:Head and Neck Neoplasms / Q000000981:diagnostic imaging / Q000601:surgery; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008297:Male; D008875:Middle Aged; D008961:Models, Structural; D015203:Reproducibility of Results; D012886:Skull / Q000002:abnormalities / Q000000981:diagnostic imaging* / Q000601:surgery; D013238:Stereotaxic Techniques; D014057:Tomography, X-Ray Computed