| Frameless stereotaxy for radiosurgical planning and follow-up. | |
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MedLine Citation:
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PMID: 7502729 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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In our centre, 111 patients have been treated with linear accelerator stereotactic radiosurgery. Angiographic, CT and MRI images are generated and the target coordinates calculated in 3 dimensions. For CT scanning, cross sections of perpendicular and oblique fiducial markers are seen. For follow-up CT scans done without the frame, a virtual frame is generated by means of a computer program that places fiducial markers on each CT scan cut, as if the patient had been wearing the OBT frame and the scan produced with the gantry parallel to the base of the frame. The position of the oblique marker may be calculated by knowing the thickness and position of each CT cut. Various natural fiducial markers (bony landmarks) are identified by coordinates in the scan with the patient wearing the real frame and in the scan with the virtual frame applied. A transformation matrix is utilized to establish the equivalence between the original CT scan with the real frame applied and subsequent scans without the real frame but with the virtual frame applied. In effect, the virtual frame is re-applied in exactly the same position as the real frame. Lesion measurements may then be duplicated and growth or regression accurately established. The uncertainty in this system of re-application resides in possible patient movement, CT scan slice thickness and inter-observer error in the identification of natural fiducial markers. |
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Authors:
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M L Schwartz; R Ramani; P F O'Brien; C S Young; P Davey; P Hudoba |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Acta neurochirurgica. Supplement Volume: 63 ISSN: 0065-1419 ISO Abbreviation: Acta Neurochir. Suppl. Publication Date: 1995 |
Date Detail:
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Created Date: 1996-01-18 Completed Date: 1996-01-18 Revised Date: 2004-11-17 |
Medline Journal Info:
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Nlm Unique ID: 100962752 Medline TA: Acta Neurochir Suppl Country: AUSTRIA |
Other Details:
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Languages: eng Pagination: 52-6 Citation Subset: IM |
Affiliation:
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Sunnybrook Health Sciences Center, Toronto, Ontario, Canada. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Brain Neoplasms
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diagnosis,
surgery* Cerebral Angiography / instrumentation Equipment Design Follow-Up Studies Humans Image Processing, Computer-Assisted / instrumentation Intracranial Arteriovenous Malformations / diagnosis, surgery* Magnetic Resonance Imaging / instrumentation Neoplasm Recurrence, Local / diagnosis Neuroma, Acoustic / diagnosis, surgery Postoperative Complications / diagnosis Radiosurgery / instrumentation* Radiotherapy Planning, Computer-Assisted / instrumentation* Software Stereotaxic Techniques / instrumentation* Tomography, X-Ray Computed / instrumentation |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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