Stereotactic target localization accuracy in interventional magnetic resonance imaging.
OBJECTIVE
To compare stereotactic target determination, based on images obtained from interventional MRI (iMRI), conventional closed MR and CT.


METHODS
Stereotactic coordinates for 55 targets in an artificial scull were derived from iMRI scans and compared using CT as the standard. Stereotactic coordinates were also derived from iMRI scans in a series of patients and compared using iMRI fused with CT as the standard.


RESULTS
The mean difference between targets in the skull phantom determined from iMRI and CT images was 0.90 +/- 0.28 mm, with a maximum difference of 1.57 mm. The mean difference between targets in the patients derived from iMRI alone and interventional MR fused with CT was 1.39 +/- 0.54 mm, with a maximum difference of 2.47 mm.


CONCLUSIONS
The results indicate that iMRI can be used for stereotactic target localization.
Samset
Eigil
E
Interventional Center, National Hospital of Norway, University of Oslo, Oslo, Norway. eigel.samset@klinmed.uio.no
Hirschberg
Henry
H
D006801:Humans; D008279:Magnetic Resonance Imaging / Q000295:instrumentation / Q000379:methods* / Q000592:standards*; D008953:Models, Anatomic; D019047:Phantoms, Imaging; D015203:Reproducibility of Results; D012886:Skull; D013238:Stereotaxic Techniques; D014057:Tomography, X-Ray Computed