Fluoroscopically triggered contrast-enhanced three-dimensional MR angiography with elliptical centric view order: application to the renal arteries.

Wilman, Alan H.; Riederer, Stephen J.; King, Bernard F.; Debbins, Josef P.; Rossman, Phillip J.; Ehman, Richard L.

doi:10.1148/radiology.205.1.9314975

Cited by 294 publications

(178 citation statements)

References 23 publications

Supporting

Mentioning

172

Contrasting

Unclassified

Order By: Relevance

“…More than a decade ago, basic advances were made with the intent of providing a high-quality arterial phase image. These included understanding the effect of missed timing of the acquisition to the contrast material bolus (4), development of methods to provide accurate timing (5)(6)(7), and development of centric phase encoding as a means for allowing high spatial resolution with good venous suppression (8,9). Methods were developed for time-resolved 3D acquisition (10), which in general involved a trade-off of temporal for spatial resolution (11).…”

mentioning

confidence: 99%

Peripheral Vasculature: High-Temporal- and High-Spatial-Resolution Three-dimensional Contrast-enhanced MR Angiography

Haider

Glockner²,

Stanson

et al. 2009

Radiology

View full text Add to dashboard Cite

Purpose:To prospectively evaluate the feasibility of performing high-spatial-resolution (1-mm isotropic) time-resolved three-dimensional (3D) contrast material-enhanced magnetic resonance (MR) angiography of the peripheral vasculature with Cartesian acquisition with projectionreconstruction-like sampling (CAPR) and eightfold accelerated two-dimensional (2D) sensitivity encoding (SENSE). Materials and Methods:All studies were approved by the institutional review board and were HIPAA compliant; written informed consent was obtained from all participants. There were 13 volunteers (mean age, 41.9; range, 27-53 years). The CAPR sequence was adapted to provide 1-mm isotropic spatial resolution and a 5-second frame time. Use of different receiver coil element sizes for those placed on the anterior-to-posterior versus left-to-right sides of the field of view reduced signal-to-noise ratio loss due to acceleration. Results from eight volunteers were rated independently by two radiologists according to prominence of artifact, arterial to venous separation, vessel sharpness, continuity of arterial signal intensity in major arteries (anterior and posterior tibial, peroneal), demarcation of origin of major arteries, and overall diagnostic image quality. MR angiographic results in two patients with peripheral vascular disease were compared with their results at computed tomographic angiography. Results:The sequence exhibited no image artifact adversely affecting diagnostic image quality. Temporal resolution was evaluated to be sufficient in all cases, even with known rapid arterial to venous transit. The vessels were graded to have excellent sharpness, continuity, and demarcation of the origins of the major arteries. Distal muscular branches and the communicating and perforating arteries were routinely seen. Excellent diagnostic quality rating was given for 15 (94%) of 16 evaluations. Conclusion:The feasibility of performing high-diagnostic-quality timeresolved 3D contrast-enhanced MR angiography of the peripheral vasculature by using CAPR and eightfold accelerated 2D SENSE has been demonstrated.

show abstract

mentioning

confidence: 99%

Peripheral Vasculature: High-Temporal- and High-Spatial-Resolution Three-dimensional Contrast-enhanced MR Angiography

Haider

Glockner²,

Stanson

et al. 2009

Radiology

View full text Add to dashboard Cite

show abstract

“…Third, precise timing of the acquisition can further reduce bolus profile artifacts. A robust method for timing the acquisition is "fluoroscopic" scanning of the arriving bolus (18). With this technique, the physician or technologist observes the arrival of the bolus in a real-time "fluoroscopic" scan and triggers the CE-MRA acquisition at the peak of the arterial signal.…”

Section: Contrast-enhanced Mr Angiography (Ce-mra)mentioning

confidence: 99%

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

Wilson

Eubank

Vasbinder

et al. 2006

Magnetic Resonance Imaging

View full text Add to dashboard Cite

Purpose:To evaluate the use of sensitivity encoding (SENSE) to reduce scan time and decrease detrimental artifacts arising from motion and bolus profile effects during contrast-enhanced MR angiography (CE-MRA) of the renal arteries (RAs). Materials and Methods:A direct comparison of conventional and SENSE (acceleration factor 2) CE-MRA protocols was performed on 20 patients. Each patient underwent both scans. Both protocols achieved the same resolution, but the SENSE protocol was 50% faster and utilized a faster injection than the conventional scan. Three radiologists graded the images for image quality, artifact levels, and reader confidence.Results: While the signal-to-noise ratio (SNR) decreased (26 Ϯ 5 vs. 30 Ϯ 10; P ϭ 0.04) with the SENSE protocol, the image-quality scores for four identified segments of the RAs increased or were unchanged. The largest improvements in image quality occurred in the more distal segments of the RAs. Parenchymal ringing (P ϭ 0.005) and RA blurring (P ϭ 0.006) were significantly reduced, and there was a trend toward improvement of RA ringing despite the increased injection rate. Conclusion:The faster SENSE scan maintained nearly the same SNR (due to faster injection of Gd-chelate), reduced artifact levels, and improved image quality ratings for the distal renal vessels.

show abstract

“…Some key developments include the advent of 1) high-performance gradient hardware capable of providing repetition times (TR) and echo times (TE) on the order of a few milliseconds, making it possible to acquire moderate resolution CE-MRA images within a breath-hold; 2) real-time fluoroscopic monitoring eliminating the guesswork involved in timing the bolus arrival in the target vasculature (8,9); and 3) centric phase-encode acquisition schemes that capture the arterial enhancement associated with the first pass of the gadolinium (Gd) contrast, with minimal venous contamination even in scans with long acquisition times (10)(11)(12)(13). These developments have contributed to the improved robustness of CE-MRA, and numerous published studies have shown high sensitivity and specificity of CE-MRA for evaluating renal artery disease (1)(2)(3)(4)(5)(6)(7).…”

mentioning

confidence: 99%

Direct comparison of sensitivity encoding (SENSE) accelerated and conventional 3D contrast enhanced magnetic resonance angiography (CE‐MRA) of renal arteries: Effect of increasing spatial resolution

Muthupillai

Douglas

Huber

et al. 2009

Magnetic Resonance Imaging

View full text Add to dashboard Cite

Purpose: To assess the effect of attaining higher spatial resolution in contrast-enhanced magnetic resonance angiography (MRA) of renal arteries using parallel imaging, sensitivity encoding (SENSE), by comparing the SENSE contrast-enhanced (CE) MRA against a conventional CE-MRA protocol with identical scan times, injection protocol, and other acquisition parameters. Materials and Methods:Numerical simulations and a direct comparison of SENSE-accelerated versus conventional acquisitions were performed. A total of 41 patients (18 male) were imaged using both protocols for a direct comparison. Both protocols used fluoroscopic triggering, centric encoding, breath-holding, equivalent injection protocol, and lasted %30 seconds.Results: Simulated point-spread functions were narrower for the SENSE protocol compared to the conventional protocol. In the patient study, although the SENSE protocol produced images with lower signal-to-noise ratio (SNR), image quality was better for all segments of the renal arteries. In addition, ringing of kidney parenchyma and renal artery blurring were significantly reduced in the SENSE protocol. Finally, reader confidence improved with the SENSE protocol.Conclusion: Despite a reduction in SNR, the higher-resolution SENSE CE-MRA provided improved image quality, reduced artifacts, and increased reader confidence compared to the conventional protocol.

show abstract

Fluoroscopically triggered contrast-enhanced three-dimensional MR angiography with elliptical centric view order: application to the renal arteries.

Abstract: With this fluoroscopically triggered MR angiographic technique, high-quality, arterial phase, relatively motion immune angiograms can be routinely obtained.

Cited by 294 publications

References 23 publications

Peripheral Vasculature: High-Temporal- and High-Spatial-Resolution Three-dimensional Contrast-enhanced MR Angiography

Peripheral Vasculature: High-Temporal- and High-Spatial-Resolution Three-dimensional Contrast-enhanced MR Angiography

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

Direct comparison of sensitivity encoding (SENSE) accelerated and conventional 3D contrast enhanced magnetic resonance angiography (CE‐MRA) of renal arteries: Effect of increasing spatial resolution

Contact Info

Product

Resources

About