Beschreibung und Anwendung eines Zielgerätes für stereotaktische Hirnoperationen (II. Modell)

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

“…After having done several tests we chose a special plastic material whose torsion model and mechanical stability withstands the extreme forces and at the same time mini mizes the artifacts in the MRI picture. Figure 1 shows this plastic ring whose dimensions correspond exactly with the stereotactic ring made from metal, so all the additional equipment of our stereotactic de vice [1,9] fit exactly. The patient's head is fixed by movable plastic attachments carrying the plastic screws tipped with sharp points made from quartz or steel.…”

“…The MRI scan taken from the midsagittal plane enables us to determine the nec essary targets of the hypothalamus [8,9], which is much better than can be obtained with CT scanning. …”

“…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. In principle, the method holds true for all the other stereotactic devices.…”

The Pioneering and Unknown Stereotactic Approach of Roeder and Orthner from Göttingen. Part I. Surgical Technique for Tailoring Individualized Stereotactic Lesions

“…Roeder and Orthner pointed out that only a few stereotactic systems exhibited a high enough degree of accuracy considered as absolutely necessary for interventions in the brain [14]. In their opinion, the systems of both Riechert [15,16,17] and Leksell [18] fulfilled this requirement, and they chose a system that enabled the surgeon to simulate targeting on a phantom [14,16,17]. This was possible with the system developed by Riechert and Wolff [15], which ranked among the most accurate stereotactic systems and which stood the test of time (mounting of frame is shown in fig.…”

“…String electrodes were also used in other centers [37,60], but eventually rod (straight needle) electrodes became more popular and have since prevailed. In fact, Roeder and Orthner [3] started using string electrodes developed by Riechert and colleagues in Freiburg [15,16,17]. They switched to modified electrodes manufactured in the Zentralwerkstatt of the Max Planck Institute, Göttingen, with a gauged driving mechanism and some other improvements [14].…”