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, Raja; Douglas, Ewan S.; Huber, Steffen; Lambert, Brenda; Pereyra, Mercedes; Wilson, Gregory J.; Flamm, Scott D.

doi:10.1002/jmri.22002

Cited by 16 publications

(17 citation statements)

References 48 publications

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“…One study found that scan time for musculoskeletal exams can be reduced by half without compromising diagnostic quality [31]. SENSE is also used in MR Angiography (MRA) exams to visualize intracranial vessels [32], abdominal vasculature [33–35], and peripheral vessels [36]. …”

Section: Representative Parallel Imaging Techniques: Sense Grappamentioning

confidence: 99%

Recent advances in parallel imaging for MRI

Hamilton

Franson

Seiberlich

2017

Progress in Nuclear Magnetic Resonance Spectroscopy

180

125

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Magnetic Resonance Imaging (MRI) is an essential technology in modern medicine. However, one of its main drawbacks is the long scan time needed to localize the MR signal in space to generate an image. This review article summarizes some basic principles and recent developments in parallel imaging, a class of image reconstruction techniques for shortening scan time. First, the fundamentals of MRI data acquisition are covered, including the concepts of k-space, undersampling, and aliasing. It is demonstrated that scan time can be reduced by sampling a smaller number of phase encoding lines in k-space; however, without further processing, the resulting images will be degraded by aliasing artifacts. Nearly all modern clinical scanners acquire data from multiple independent receiver coil arrays. Parallel imaging methods exploit properties of these coil arrays to separate aliased pixels in the image domain or to estimate missing k-space data using knowledge of nearby acquired k-space points. Three parallel imaging methods—SENSE, GRAPPA, and SPIRiT—are described in detail, since they are employed clinically and form the foundation for more advanced methods. These techniques can be extended to non-Cartesian sampling patterns, where the collected k-space points do not fall on a rectangular grid. Non-Cartesian acquisitions have several beneficial properties, the most important being the appearance of incoherent aliasing artifacts. Recent advances in simultaneous multi-slice imaging are presented next, which use parallel imaging to disentangle images of several slices that have been acquired at once. Parallel imaging can also be employed to accelerate 3D MRI, in which a contiguous volume is scanned rather than sequential slices. Another class of phase-constrained parallel imaging methods takes advantage of both image magnitude and phase to achieve better reconstruction performance. Finally, some applications are presented of parallel imaging being used to accelerate MR Spectroscopic Imaging.

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Section: Representative Parallel Imaging Techniques: Sense Grappamentioning

confidence: 99%

Recent advances in parallel imaging for MRI

Hamilton

Franson

Seiberlich

2017

Progress in Nuclear Magnetic Resonance Spectroscopy

180

125

View full text Add to dashboard Cite

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“…10) accelerations have also been shown to provide high-quality single-phase abdominal angiography. Applying SENSE in both the left-right and anterior-posterior directions necessitated a large FOV, though at the same time made it possible to (a) maintain high in-plane spatial resolution (approximately 1.0-1.5 mm 2 ) comparable to that of other renal MR angiographic techniques ( 17,18,20,33,34 ), (b) extend that spatial resolution to the section dimension with a more inclusive imaging slab than generally used, (c) maintain an image time in the 20-second range, and (d) achieve k-space traversal rates similar to those of small-FOV techniques ( 35 ). The large FOV allows for imaging of all abdominal vessels in the renal MR angiogram, which virtually eliminates the possibility of missing a renal artery origin or an accessory renal artery and provides visualization of lesions in the aorta, iliac arteries, and mesenteric arteries.…”

Section: Discussionmentioning

confidence: 99%

“…Parallel imaging (14)(15)(16) ) is a method whereby the redundancy of samples from multiple receiver coils is used to reduce the number of repetitions of the pulse sequence necessary to generate an image of a given spatial resolution. It has been applied to abdominal CE MR angiography to decrease image time (17)(18)(19), to improve spatial resolution for a given image time ( 17,18,20 ), or to improve coverage ( 21,22 ). Parallel imaging is accompanied by a loss of SNR in the resultant images, with the SNR loss worsening as the level of acceleration factor ( R ) increases.…”

Section: Discussionmentioning

confidence: 99%

Contrast-enhanced MR Angiography of the Abdomen with Highly Accelerated Acquisition Techniques

Glockner¹,

Young²,

Riederer³

2011

Radiology

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Purpose:To demonstrate that highly accelerated (net acceleration factor [ R net ] Ն 10) acquisition techniques can be used to generate three-dimensional (3D) subsecond timing images, as well as diagnostic-quality high-spatial-resolution contrast material-enhanced (CE) renal magnetic resonance (MR) angiograms with a single split dose of contrast material. Materials and Methods:All studies were approved by the institutional review board and were HIPAA compliant; written consent was obtained from all participants. Twenty-two studies were performed in 10 female volunteers (average age, 47 years; range, 27-62 years) and six patients with renovascular disease (three women; average age, 48 years; range, 37-68 years; three men; average age, 60 years; range, 50-67 years; composite average age, 54 years; range, 38-68 years). The two-part protocol consisted of a low-dose (2 mL contrast material) 3D timing image with approximate 1-second frame time, followed by a high-spatial-resolution (1.0-1.6-mm isotropic voxels) breath -hold 3D renal MR angiogram (18 mL) over the full abdominal fi eld of view. Both acquisitions used two-dimensional (2D) sensitivity encoding acceleration factor ( R ) of eight and 2D homodyne (HD) acceleration ( R HD ) of 1.4-1.8 for R net = R · R HD of 10 or higher. Statistical analysis included determination of mean values and standard deviations of image quality scores performed by two experienced reviewers with use of eight evaluation criteria. Results:The 2-mL 3D time-resolved image successfully portrayed progressive arterial fi lling in all 22 studies and provided an anatomic overview of the vasculature. Successful timing was also demonstrated in that the renal MR angiogram showed adequate or excellent portrayal of the main renal arteries in 21 of 22 studies. Conclusion:Two-dimensional acceleration techniques with R net of 10 or higher can be used in CE MR angiography to acquire (a) a 3D image series with 1-second frame time, allowing accurate bolus timing, and (b) a high-spatial-resolution renal angiogram.q RSNA, 2011Supplemental material: http://radiology.rsna.org/lookup /suppl

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“…DW echo-planar imaging acquisition can lead to imaging distortion, dropout, blurring, and signal loss. Geometric distortion and scanning time can be improved by the use of parallel imaging [25,26].…”

Section: Mri Techniquementioning

confidence: 99%

“…Recently, Bitar et al [24] described the utility of a 3D T1-weighted high-resolution technique with an 8-channel neurovascular phased-array coil. In MRA, parallel imaging (sensitivity-encoding [SENSE]) can be used to reduce the breath-hold duration, improve spatial resolution, improve venous suppression, and minimize spatial resolution loss caused by bolus profile modulation for a given scan time with appropriate triggering and 3D phase-encoding order [25].…”

mentioning

confidence: 99%