Direct Target Point Determination for Stereotactic Brain Operations from CT Data and the Calculation of Setting Parameters for Polar-Coordinate Stereotactic Devices

The reproducibility of a noninvasive computed tomography (CT)/magnetic resonance imaging stereoadapter was tested on 12 healthy volunteers. The adapter was easy to mount and detach without discomfort. Two repeated mountings of the adapter showed a good reproducibility in relation to the scalp. When extrapolated to a hypothetical target in the right thalamus, the mean differences between the two mountings were 0.07 mm in the lateral, 0.16 mm in the anteroposterior and 0.17 mm in the height coordinates. This high degree of reproducibility seems to permit a safe CT-guided functional stereotaxis, where the preoperative CT scanning can take place on one day and the surgery may be performed on any other suitable day.

Section: Introductionmentioning

confidence: 99%

Reproducibility of Repeated Mountings of a Noninvasive CT/MRI Stereoadapter

Hariz¹,

Eriksson²

1986

“…1,200 successful CT stereotactic interventions have been per formed in our department [2,6]; it has therefore become the method of choice. In order to utilize the great diagnostic potential of magnetic resonance imaging (MRI) we developed a method to adapt the Riechert-Mundinger stereotactic device [9], including the computer com patible modification of Birg and Mundinger [ 1], for use with MRI.…”

Section: Introductionmentioning

confidence: 99%

X-Ray and Magnetic Resonance Stereotaxy for Functional and Nonfunctional Neurosurgery

Birg¹,

Mundinger²,

Mohadjer³

et al. 1985

Self Cite

By means of new plastic stereotactic ring and head fixers, stereotactic procedures can be combined with MRI, with stereotactic coordinates obtained from the MRI images. The method was rechecked against CT stereotaxy and shows a good correspondence of the target coordinates. With MRI stereotaxy, structures near boney regions will be more accessible than with CT stereotaxy. Moreover, the MRI procedure seems to have advantages for functional therapy without the necessity of contrast ventriculography.

“…Since the introduction of high resolution computer tomographs with corresponding reconstruction programs and the possibility of in tegrating the stereotactic system of Riechert and Mundinger [10] into CT [1] the required target points for stereotactic dentatotomy can be determinded directly from the CT image. Thus, invasive methods for ventricular landmarks are no longer necessary.…”

mentioning

confidence: 99%

Computerized Tomography-Guided Stereotactic Dentatotomy

Weigel¹,

Mundinger²

1986

Self Cite

The CT stereotactic technique of dentatotomy is described and illustrated with two examples. With this combined technique, ventriculography or pneumencephalography is no longer needed to determine the target point. In addition, due to the direct representation of anatomic structures in the CT, abnormal positions of the dentate nucleus may be taken into consideration in the determination of the target point and approach for the coagulation probe.