Oblique planes of section in MR imaging.

Edelman, Robert R.; Stark, D D; Saini, S; Ferrucci, J T; Dinsmore, Robert E.; Ladd, W. A.; Brady, T J

doi:10.1148/radiology.159.3.3704162

Cited by 22 publications

(6 citation statements)

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“…The limitations of spatial resolution of the imaging modalities used, leading to volume averaging are made worse by the curved structures. The use of unique plane images may have led to volume averaging affecting lesion identification, except for the limited slices oriented perpendicular to the joint surface . The equine carpal joints represent a more complex anatomic area compared to the distal interphalangeal or metacarpophalangeal joints; including thinner cartilage, a more rounded articular surface, and multiple small bones forming the joints, all of which affect the spatial resolution of MRI and CT imaging .…”

Section: Discussionmentioning

confidence: 99%

Comparison between magnetic resonance imaging, computed tomography, and arthrography to identify artificially induced cartilage defects of the equine carpal joints

Sánchez-Andrade

Richter

Kühn

et al. 2018

Vet Radiology Ultrasound

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While articular cartilage changes are considered to be one of the initial events in the pathological cascade leading to osteoarthritis, these changes remain difficult to detect using conventional diagnostic imaging modalities such as plain radiography. The aim of this prospective, experimental, methods comparison study was to compare the sensitivity of magnetic resonance imaging (MRI), magnetic resonance arthrography, computed tomography (CT), and CT arthrography in the detection of artificially induced articular cartilage defects in the equine carpal joints. Defects were created in the antebrachiocarpal and middle carpal joint using curettage by a board-certified equine surgeon. Normal articular cartilage thickness varied from a maximum of 1.22 mm at the level of the distal aspect of the radius to a minimum of 0.17 mm in the proximal articular surface of the third carpal bone. Regarding cartilaginous defect measurements the remaining cartilaginous bed range from a maximum of 0.776 mm in the partial thickness defects, and 0 mm (defect reaches the subchondral bone) when total thickness defect were made. Computed tomography and magnetic resonance imaging were performed followed by CT arthrography and magnetic resonance arthrography after antebrachiocarpal and middle carpal intraarticular contrast administration. All images were reviewed by two board-certified veterinary radiologists, both of whom were blinded to the location, presence of, and thickness of the cartilage defects. A total number of 72 lesions in nine limbs were created. Mean sensitivity for localizing cartilage defects varied between imaging modalities with CT arthrography showing the best sensitivity (69.9%), followed by magnetic resonance arthrography (53.5%), MRI (33.3%), and CT (18.1%) respectively. The addition of contrast arthrography in both magnetic resonance and CT improved the rate of cartilage lesion detection although no statistical significance was found. Computed tomographic arthrography displayed the best sensitivity for detecting articular cartilage defects in the equine antebrachiocarpal and middle-carpal joints, compared to magnetic resonance arthrography, MRI, and CT.

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Section: Discussionmentioning

confidence: 99%

Comparison between magnetic resonance imaging, computed tomography, and arthrography to identify artificially induced cartilage defects of the equine carpal joints

Sánchez-Andrade

Richter

Kühn

et al. 2018

Vet Radiology Ultrasound

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“…Angled sagittal MR images are easily obtained and accurately angled to any particular area of interest. Their use has been clearly outlined in other anatomic areas [3,6,8,14]. Their major disadvantage is that they increase the examination time.…”

Section: Discussionmentioning

confidence: 99%

A comparison of angled sagittal MRI and conventional MRI in the diagnosis of herniated disc and stenosis in the cervical foramen

et al. 2009

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The object of this study is to demonstrate that angled sagittal magnetic resonance imaging (MRI) enables the precise diagnosis of herniated disc and stenosis in the cervical foramen, which is not available with conventional MRI. Due to both the anatomic features of the cervical foramen and the limitations of conventional MR techniques, it has been difficult to identify disease in the lateral aspects of the spinal canal and foramen using only conventional MRI. Angled sagittal MRI oriented perpendicular to the true course of the foramina facilitates the identification of the lateral disease. A review of 43 patients, who underwent anterior cervical discectomy and interbody fusion, is presented with a herniated disc and/or stenosis in the cervical foramen. They all had undergone conventional MRI and angled sagittal MRI. Fifty levels were surgically explored for evidence of foraminal herniated disc and stenosis. The results of each test were correlated with what was found at each explored surgical level. The sensitivity, specificity, and accuracy of both examinations for making the diagnosis of foraminal herniated disc and stenosis were compared. During the diagnosis of foraminal herniated disc, the sensitivity, specificity, and accuracy of angled sagittal MRI were 96.7, 95.0, and 96.0%, respectively, compared with 56.7, 85.0, and 68.0% for conventional MRI. In making the diagnosis of foraminal stenosis, the sensitivity, specificity, and accuracy of angled sagittal MRI were 96.3, 95.7, and 96.0%, respectively, compared with 40.7, 91.3, and 66.0% for conventional MRI. In the above groups, the difference between the tests for making the diagnosis of both foraminal herniated disc and stenosis was found to be statistically significant in sensitivity and accuracy. Angled sagittal MRI was a more accurate test compared to conventional MRI for making the diagnosis of herniated disc and stenosis in the cervical foramen. It can be utilized for the precise diagnosis of foraminal herniated disc and stenosis difficult or ambiguous in conventional MRI.

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“…In humans, neuroforaminal dimensions are evaluated in standard parasagittal planes and image acquisition of the entry, middle, and exit zones of the neuroforamina have been employed to subjectively assess L7 nerve root encroachment . In a prospective human study it was suggested that coronal oblique lumbar MRI can precisely demonstrate nerve roots in foraminal and extraforaminal areas and improve the diagnostic ability …”

Section: Introductionmentioning

confidence: 99%

Effects of Image Plane, Patient Positioning, and Foraminal Zone on Magnetic Resonance Imaging Measurements of Canine Lumbosacral Intervertebral Foramina

Zindl¹,

Tucker

Jovanovik³

et al. 2016

Vet Radiology Ultrasound

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Degenerative lumbosacral stenosis has been suspected to have a dynamic component, especially regarding encroachment of the L7 nerve roots exiting the lumbosacral foramina. Angled cross-sectional imaging of the neuroforamina has been found improve the accuracy of the diagnosis of stenosis in humans. In this anatomic study, foraminal apertures were evaluated by MRI at the entry, middle, and exit zones of the nerve roots in 30 dogs that were clinically affected by lumbosacral disease. Standard vs. oblique planar orientation and neutral vs. hyperextended positioning of the lumbosacral area were compared by measuring the median values for entry, middle, and exit zones. The neuroforaminal area acquired using oblique plane acquisition was significantly smaller than standard parasagittal measurements. Furthermore, standard parasagittal neuroforaminal dimensions in the hyperextended position were significantly smaller than standard parasagittal measurements in the neutral position. This statistical difference was even more pronounced for neuroforaminal dimension evaluated in the oblique plane and hyperextended position. Positioning of the dog during imaging has a significant effect on neuroforaminal dimension, corroborating the notion that spinal position may influence neural claudication in clinically affected patients. Reductions in neuroforaminal dimension are more evident on oblique planar image acquisition, suggesting that this approach may be more useful than parasagittal imaging as a tool for identifying subtle changes in L7 neuroforaminal dimensions in cases of canine lumbosacral stenosis.

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Oblique planes of section in MR imaging.

Cited by 22 publications

References 0 publications

Comparison between magnetic resonance imaging, computed tomography, and arthrography to identify artificially induced cartilage defects of the equine carpal joints

Comparison between magnetic resonance imaging, computed tomography, and arthrography to identify artificially induced cartilage defects of the equine carpal joints

A comparison of angled sagittal MRI and conventional MRI in the diagnosis of herniated disc and stenosis in the cervical foramen

Effects of Image Plane, Patient Positioning, and Foraminal Zone on Magnetic Resonance Imaging Measurements of Canine Lumbosacral Intervertebral Foramina

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