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Due to rights restrictions, this image cannot be enlarged, viewed at full screen, or downloaded. As part of the Met's Open 1999.90 policyyou can freely copy, modify and distribute this image, even for commercial purposes, 1999.90.

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1999.90

Object: Some of the earliest successful frame-based stereotactic interventions directed toward the thalamus and basal ganglia depended on identifying the anterior commissure AC and posterior commissure PC in a sagittal ventriculogram and defining the intercommissural line that connects them in the midsagittal plane. The AC-PC line became the essential landmark for the localization of neuroanatomical targets in the basal ganglia and diencephalon and for relating them to stereotactic atlases. The goal of the present article is to present the authors' technique. Methods: The technique described uses MR sequences that minimize geometric distortion and registration error, thereby maximizing accuracy in AC-PC line determinations from axially displayed MR data. The technique is based on the authors' experience with the Leksell G-frame but can be generalized to other MR imaging-based stereotactic systems. This methodology has been used in a series of 62 stereotactic procedures in 47 adults 55 pallidotomies and seven thalamotomies with preliminary results that compare favorably with results reported when using microelectrode recordings. The measurements of the AC-PC line reported here also compare favorably with those based on ventriculography and computerized tomography scanning. Conclusions: The methodology reported here is critical in maintaining the accuracy and utility of MR imaging as its role in modern stereotaxy expands. Accurate parameters such as these aid in ensuring the safety, efficacy, and reproducibility of MR-guided stereotactic procedures. Abstract Object: Some of the earliest successful frame-based stereotactic interventions directed toward the thalamus and basal ganglia depended on identifying the anterior commissure AC and posterior commissure PC in a sagittal ventriculogram and defining the intercommissural line that connects them in the midsagittal plane. Publication types Comparative Study. Substances Contrast Media.

Orrison Articles by M. Neurosurgery 59—72, false. Orrison William W.

Object: The authors performed a retrospective analysis of consecutive patients in whom instrumentation was placed to promote lumbar fusion for the treatment of degenerative instability. All procedures were performed by a single surgeon. The authors sought to determine the risk factors for next-segment degeneration after lumbar spinal fusion with rigid instrumentation. Methods: Thirty-one of fusion procedures were performed in women who were postmenopausal. A total of 18 of patients developed symptomatic next-segment degeneration at a previously asymptomatic level; 15 were postmenopausal women.

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1999.90

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Volume Issue 3 Mar in Journal of Neurosurgery. Image: Substances Contrast Media. Resources for Research The Met's Libraries and Research Centers provide unparalleled resources for research and welcome an international community of students and scholars. Spencer B. Conclusions: The methodology reported here is critical in maintaining the accuracy and utility of MR imaging as its role in modern stereotaxy expands. Classification: Sculpture. Burr Article by Paul R. Public Domain You can copy, modify, and distribute this work, all without asking permission. Sign in Sign up. View Expanded. Patients frequently had more than one degenerative process at the next segment. Public Domain.

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Publication types Comparative Study. The Met Collection API is where all makers, creators, researchers, and dreamers can connect to the most up-to-date data and public domain images for The Met collection. Jeffrey D. Contact us The information about this object, including provenance, may not be currently accurate. Standing Buddha 8th—9th century. Waves late s-early s. Type of artwork. Radiology —, Scroll left to view more. Click here for subscription options.