| Effects of body position, imaging plane, and observer on computed tomographic measurements of the lumbosacral intervertebral foraminal area in dogs. | |
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MedLine Citation:
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PMID: 21728851 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Objective-To evaluate effects of imaging plane, flexion and extension, patient weight, and observer on computed tomographic (CT) image measurements of the area of the lumbosacral (L7-S1) intervertebral foramen (LSIF) in dogs. Sample-12 dog cadavers (2 were excluded because of foraminal stenosis). Procedures-In each cadaver, sagittal, sagittal oblique, transverse oblique, and double oblique CT images were obtained at 3 zones (entrance, middle, and exit zones) of the region of the lateral lumbar spinal canal that comprises the LSIF while the lumbosacral junction (LSJ) was positioned in flexion or extension. Barium-impregnated polymethylmethacrylate was used to fill the intervertebral foramina to aid boundary detection. Measurements of interest were obtained. Results-Among the dog cadavers, there was large variability in LSIF cross-sectional areas (range, 0.12 to 0.44 cm(2); SD, 0.1 cm(2)) and in foraminal angles required to obtain a double oblique plane in LSJ extension (SD, 8° to 9°). For LSIF area measurements in standard sagittal CT images, interobserver variability was 23% to 44% and intraobserver variability was 4% to 5%. Sagittal oblique images obtained during LSJ extension yielded smaller mean LSIF areas (0.30 cm(2)), compared with findings in sagittal images (0.37 to 0.52 cm(2)). The exit and middle zone areas were smaller than the entrance zone area in sagittal images obtained during LSJ extension. Conclusions and Clinical Relevance-Repeated measurements of the LSIF area in images obtained during LSJ extension may be unreliable as a result of interobserver variability and the effects of dog positioning and CT slice orientation. |
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Authors:
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Brent M Higgins; Peter J Cripps; Martin Baker; Lee Moore; Fay E Penrose; James F McConnell |
Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: American journal of veterinary research Volume: 72 ISSN: 1943-5681 ISO Abbreviation: Am. J. Vet. Res. Publication Date: 2011 Jul |
Date Detail:
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Created Date: 2011-07-06 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0375011 Medline TA: Am J Vet Res Country: United States |
Other Details:
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Languages: eng Pagination: 905-17 Citation Subset: IM |
Affiliation:
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Department of Musculoskeletal Biology, Leahurst Campus, University of Liverpool, Neston, Wirral, Cheshire, CH64 7TE, England. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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