Time-resolved, high-resolution contrast-enhanced MR angiography of dialysis shunts using the CENTRA keyhole technique with parallel imaging

The subclavian steal effect indicates atherosclerotic disease of the supraaortic vessels but rarely causes cerebrovascular events in itself. Noninvasive imaging providing detailed anatomic as well as hemodynamic information would therefore be desirable. From a group of 25 consecutive patients referred for MR angiography, four with absent or highly attenuated signal in one of the vertebral arteries on 3D multislab time-of-flight MR angiography were selected to undergo 3D time-resolved contrast-enhanced MR angiography. The time-resolved 3D contrast series (source images and MIPs) were evaluated visually and by graphic analysis of time-intensity curves derived from the respective V1 and V3 segments of both vertebral arteries on the source images. In two cases with high-grade proximal left subclavian stenosis, time-resolved 3D ce-MRA was able to visualise retrograde contrast filling of the left VA. There was a marked delay in time-to-peak between the left and right V1 segments in one case and a shallower slope of enhancement in another. In the other two cases, there was complete or collateralised segmental occlusion of the VAs.

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Coarctation of the abdominal aorta: Demonstration of a rare anomaly using contrast-enhanced MR-angiography

VASA ◽

10.1024/0301-1526.38.1.66 ◽

2009 ◽

Vol 38 (1) ◽

pp. 66-71 ◽

Cited By ~ 2

Author(s):

Schubert

Keyword(s):

Abdominal Aorta ◽

Mr Angiography ◽

Parallel Imaging ◽

Left Renal Vein ◽

Systemic Hypertension ◽

Contrast Enhanced ◽

Younger Age ◽

Maximum Intensity Projections ◽

Collateral Vessels ◽

First Time

We describe a case of aortic coarctation at the level of the infrarenal abdominal aorta which is encountered in less than six individuals in one million. In contrast to aortic narrowing above or including the renal arteries, this seems to be a relatively benign anomaly without systemic hypertension or impaired renal function. For the first time in this type of anomaly, contrast-enhanced MR angiography (ce-MRA) on a multi-receiver channel MR system, with an 8-channel phased array coil and parallel imaging was used. Ce-MRA displayed a tortuous, narrowed aortic segment that was found to be associated with mesenteric artery stenosis and compression of the orthotopic left renal vein, also known as the nutcracker phenomenon. All major aortic branches could be depicted using 3D surface-shaded displays and subvolume maximum intensity projections (MIPs). Collateral vessels of the abdominal wall were identified using whole-volume MIPs. Since the majority of aortic malformations are diagnosed at a younger age, and many suffer from renal insufficiency, we conclude that ce-MRA will eventually place conventional DSA as the modality of choice in malformations of the abdominal aorta.

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Utilizing SENSE to reduce scan duration in high-resolution contrast-enhanced renal MR angiography

Journal of Magnetic Resonance Imaging ◽

10.1002/jmri.20691 ◽

2006 ◽

Vol 24 (4) ◽

pp. 873-879 ◽

Cited By ~ 16

Author(s):

Gregory J. Wilson ◽

William B. Eubank ◽

G. Boudewijn C. Vasbinder ◽

Alfons G.H. Kessels ◽

Romhild M. Hoogeveen ◽

...

Keyword(s):

High Resolution ◽

Mr Angiography ◽

Contrast Enhanced

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Application of direct virtual coil to dynamic contrast-enhanced MRI and MR angiography with data-driven parallel imaging

Magnetic Resonance in Medicine ◽

10.1002/mrm.24686 ◽

2013 ◽

Vol 71 (2) ◽

pp. 783-789 ◽

Cited By ~ 2

Author(s):

Kang Wang ◽

Philip J. Beatty ◽

Scott K. Nagle ◽

Scott B. Reeder ◽

James H. Holmes ◽

...

Keyword(s):

Mr Angiography ◽

Parallel Imaging ◽

Data Driven ◽

Dynamic Contrast Enhanced Mri ◽

Dynamic Contrast Enhanced ◽

Enhanced Mri ◽

Contrast Enhanced ◽

Contrast Enhanced Mri

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Contrast-Enhanced Magnetic Resonance Angiography Using a Novel Elastin-Specific Molecular Probe in an Experimental Animal Model

Contrast Media & Molecular Imaging ◽

10.1155/2018/9217456 ◽

2018 ◽

Vol 2018 ◽

pp. 1-9 ◽

Cited By ~ 1

Author(s):

Carolin Reimann ◽

Julia Brangsch ◽

Jan Ole Kaufmann ◽

Lisa C. Adams ◽

David C. Onthank ◽

...

Keyword(s):

Magnetic Resonance ◽

Image Quality ◽

Magnetic Resonance Angiography ◽

Contrast Agent ◽

Mr Angiography ◽

Molecular Probe ◽

Time Resolved ◽

Clinical Dose ◽

Contrast Enhanced ◽

First Pass

Objectives. The aim of this study was to test the potential of a new elastin-specific molecular agent for the performance of contrast-enhanced first-pass and 3D magnetic resonance angiography (MRA), compared to a clinically used extravascular contrast agent (gadobutrol) and based on clinical MR sequences. Materials and Methods. Eight C57BL/6J mice (BL6, male, aged 10 weeks) underwent a contrast-enhanced first-pass and 3D MR angiography (MRA) of the aorta and its main branches. All examinations were on a clinical 3 Tesla MR system (Siemens Healthcare, Erlangen, Germany). The clinical dose of 0.1 mmol/kg was administered in both probes. First, a time-resolved MRA (TWIST) was acquired during the first-pass to assess the arrival and washout of the contrast agent bolus. Subsequently, a high-resolution 3D MRA sequence (3D T1 FLASH) was acquired. Signal-to-noise ratios (SNRs) and contrast-to-noise ratios (CNRs) were calculated for all sequences. Results. The elastin-specific MR probe and the extravascular imaging agent (gadobutrol) enable high-quality MR angiograms in all animals. During the first-pass, the probes demonstrated a comparable peak enhancement (300.6 ± 32.9 vs. 288.5 ± 33.1, p>0.05). Following the bolus phase, both agents showed a comparable intravascular enhancement (SNR: 106.7 ± 11 vs. 102.3 ± 5.3; CNR 64.5 ± 7.4 vs. 61.1 ± 7.2, p>0.05). Both agents resulted in a high image quality with no statistical difference (p>0.05). Conclusion. The novel elastin-specific molecular probe enables the performance of first-pass and late 3D MR angiography with an intravascular contrast enhancement and image quality comparable to a clinically used extravascular contrast agent.

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