MR-angiography of the carotid arteries in 3D TDF-technique with sagittal “Double-slab” acquisition using a new head-neck coil (In German)

Purpose: To evaluate the usefulness of a dedicated head-neck coil in preoperative imaging of the supra-aortic arteries Material and Methods: Forty consecutive patients with suspected carotid artery stenosis underwent MR angiography (MRA). Using a dedicated head-neck coil, we made a complete evaluation of the supra-aortic arteries and graded the internal carotid artery (ICA) stenoses. MRA was performed at 1.5 T with: coronal 3D FISP from the aortic arch to the circle of Willis; transverse 2D FLASH and 3D TONE of the carotid bifurcation; transverse 3D TONE of the carotid siphon and the circle of Willis; and transverse 3D FISP of the aortic arch. I.a. digital subtraction angiography (DSA) was used as the reference. ICA stenoses of 70% and more at DSA (NASCET methodology) were regarded as severe Results: Severe ICA stenoses were detected with high sensitivity and specificity: 93% and 92% respectively for coronal 3D FISP; 90% and 85% respectively for transverse 2D FLASH; and 97% and 94% respectively for transverse 3D TONE. The carotid siphon and the intracranial ICA were best depicted by 3D TONE. None of the applied sequences gave a satisfactory visualization of the aortic arch or of the origins of the vertebral arteries Conclusion: With the head-neck coil, the supra-aortic arteries (including the intracranial vessels) were visualized without the need to reposition the patient, but depiction of the aortic arch was not acceptable. The quantification of ICA stenoses was reliable

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175. Cervical MR Angiography using Head-Neck Coil

Japanese Journal of Radiological Technology ◽

10.6009/jjrt.kj00003325977 ◽

1994 ◽

Vol 50 (8) ◽

pp. 1093

Keyword(s):

Mr Angiography ◽

Neck Coil ◽

Head Neck

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Carotid Arteries: Maximizing Arterial to Venous Contrast in Fluoroscopically Triggered Contrast-enhanced MR Angiography with Elliptic Centric View Ordering

Radiology ◽

10.1148/radiology.211.1.r99ap08265 ◽

1999 ◽

Vol 211 (1) ◽

pp. 265-273 ◽

Cited By ~ 92

Author(s):

John Huston ◽

Sean B. Fain ◽

Stephen J. Riederer ◽

Alan H. Wilman ◽

Matt A. Bernstein ◽

...

Keyword(s):

Mr Angiography ◽

Carotid Arteries ◽

Contrast Enhanced

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22. Cervical MR angiography using Helmholtz neck coil

Japanese Journal of Radiological Technology ◽

10.6009/jjrt.kj00003533552 ◽

1992 ◽

Vol 48 (3) ◽

pp. 480

Keyword(s):

Mr Angiography ◽

Neck Coil

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Abstract WP120: Measuring Carotid Stenosis With a Novel Non-contrast Enhanced MR Angiography Technique (SNAP): Comparison With Contrast-enhanced MR Angiography

Stroke ◽

10.1161/str.47.suppl_1.wp120 ◽

2016 ◽

Vol 47 (suppl_1) ◽

Author(s):

Hongge Shu ◽

Jie Sun ◽

Niranjan Balu ◽

Haining Liu ◽

Daniel S Hippe ◽

...

Keyword(s):

Carotid Stenosis ◽

Mr Angiography ◽

Carotid Arteries ◽

Weighted Kappa ◽

Intraplaque Hemorrhage ◽

Gadolinium Contrast ◽

Isotropic Resolution ◽

Contrast Enhanced ◽

Hemorrhage Risk ◽

Maximum Intensity Projections

Introduction: Contrast-enhanced MR angiography (CE-MRA) provides highly accurate measurement of carotid stenosis. But non-contrast techniques are desired as contrast agents may lead to anaphylaxis or nephrogenic system fibrosis. Recently, an inversion-recovery gradient echo sequence with phase-sensitive reconstruction was developed for assessment of lumen and intraplaque hemorrhage in one sequence - Simultaneous Noncontrast Angiography and intraPlaque hemorrhage (SNAP). Hypothesis: We tested the hypothesis that SNAP provides an accurate and reproducible assessment of carotid stenosis compared to CE-MRA. Methods: Fifty-eight subjects with 16-79% stenosis on ultrasound were scanned using a large-coverage (16 cm), isotropic-resolution (0.8 mm) SNAP sequence. Minimum intensity projections were generated at ten degrees increments to get 3D views of carotid arteries. Carotid stenosis was measured bilaterally according to the NASCET criteria by independent readers to estimate inter-reader reproducibility. To assess agreement between SNAP and CE-MRA, 24 subjects also underwent CE-MRA with same resolution (0.8 mm isotropic) after injection of gadolinium contrast (Magnevist). Maximum intensity projections were generated for CE-MRA and analyzed while blinded to SNAP data. Results: Of 116 carotid arteries imaged by SNAP, 10 (8.6%) were excluded by at least one reader due to poor image quality or insufficient coverage. Inter-reader reproducibility was high, yielding an intra-class correlation coefficient (ICC) of 0.95 (95% CI: 0.93, 0.96). When stenosis measurements were categorized as no/mild (0-29%), moderate (30-69%) and severe (70-99%), weighted kappa was 0.77 (95% CI: 0.66, 0.88). In the 48 arteries with CE-MRA images, agreement between SNAP and CE-MRA was excellent (ICC: 0.96, 95% CI: 0.92, 0.98; weighted kappa: 0.90, 95% CI: 0.79, 1.00). Conclusions: SNAP can be used to obtain accurate and reproducible measurement of extracranial carotid artery stenosis without gadolinium contrast. The ability of SNAP to assess both traditional (stenosis) and emerging (intraplaque hemorrhage) risk factors may promote its use in clinical workup of carotid stenosis.

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Secondary Flow in the Human Common Carotid Artery Imaged by MR Angiography

Journal of Biomechanical Engineering ◽

10.1115/1.2895439 ◽

1992 ◽

Vol 114 (1) ◽

pp. 147-149 ◽

Cited By ~ 24

Author(s):

C. G. Caro ◽

C. L. Dumoulin ◽

J. M. R. Graham ◽

K. H. Parker ◽

S. P. Souza

Keyword(s):

Human Subject ◽

Mr Angiography ◽

Carotid Arteries ◽

Three Dimensional ◽

Flow Imaging ◽

Dynamic Flow ◽

Healthy Human Subject ◽

Healthy Human ◽

The Common ◽

Common Carotid Arteries

The blood flow in arteries affects both the biology of the vessels and the development of atherosclerosis. The flow is three dimensional, unsteady, and difficult to measure or to model computationally. We have used phase-shift-based magnetic resonance angiography to image and measure the flow in the common carotid arteries of a healthy human subject. There was curvature of the vessels and thin-slice dynamic flow imaging showed evidence of the presence of secondary motions. Flexing the cervical spine straightened the vessels and reduced the asymmetry of the flow.

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