The Relationship of Imaging Techniques to the Accuracy of Frameless Stereotaxy

Publisher： Karger

E-ISSN： 1423-0372|72|2-4|136-141

ISSN： 1011-6125

Source： Stereotactic and Functional Neurosurgery, Vol.72, Iss.2-4, 2000-04, pp. : 136-141

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next

Abstract

Objective: We analyzed the accuracy of a frameless stereotactic system using computed tomographic (CT) and magnetic resonance imaging (MRI) scans of different slice thickness and T1 versus T2 weighting of MRI. Methods: An open skull with graphite pegs fixed to its base was used for all scans. CT scans were done with slice thicknesses of 1, 2 and 3 mm. MRI-visible markers were placed on top of pegs for T1-weighted and T2-weighted MRI scans, which were acquired at thicknesses of 1.5, 3 and 5 mm. For each scan, 3 separate registrations of a probe were performed; the distance between the actual probe location and that displayed on the registered image was noted. Each measurements was repeated 3 times for each registration. Results: Greatest accuracy was achieved with 3-mm-slice CT scans; this was not improved by using thinner slices. T1-weighted 1.5-mm MRI scans were 23% less accurate and T2-weighted 3-mm scans 37% less accurate. Conclusions: Frameless stereotaxy should be done using CT scans when the greatest possible accuracy is desired. There appears to be no advantage to using slice thicknesses less than 3 mm. For most craniotomy applications, T1-weighted MRI using 3-mm slices provides sufficient accuracy. Lesions imaged only on T2-weighted MRI also can be approached with adequate precision using 3-mm scans.

Related content

Application Accuracy of Automatic Registration in Frameless Stereotaxy

By  

Stereotactic and Functional Neurosurgery, Vol. 84, Iss. 2-3, 2006-08 ,pp. : 109-117 (9)

Karger

Access to resources Recommend Favorite

Nexframe Frameless Stereotaxy with Multitract Microrecording: Accuracy Evaluated by Frame-Based Stereotactic X-Ray

By  

Stereotactic and Functional Neurosurgery, Vol. 88, Iss. 3, 2010-05 ,pp. : 163-168 (6)

Karger

Access to resources Recommend Favorite

Interventional MRI-Guided Frameless Stereotaxy in Pediatric Patients

By  

Stereotactic and Functional Neurosurgery, Vol. 79, Iss. 3-4, 2003-07 ,pp. : 182-190 (9)

Karger

Access to resources Recommend Favorite

Frameless Stereotaxy without Rigid Pin Fixation during Awake Craniotomies

By  

Stereotactic and Functional Neurosurgery, Vol. 79, Iss. 3-4, 2003-07 ,pp. : 256-261 (6)

Karger

Access to resources Recommend Favorite

Co-Registration of Function and Anatomy in Frameless Stereotaxy by Contour Fitting

By  

Stereotactic and Functional Neurosurgery, Vol. 79, Iss. 3-4, 2003-07 ,pp. : 272-283 (12)

Karger

Access to resources Recommend Favorite