Parallel Imaging of the Cervical Spine at 3T: Optimized Trade-Off between Speed and Image Quality

Fruehwald-Pallamar, Julia; Szomolányi, Pavol; Fakhrai, Negar; Lunzer, A.; Weber, Michael; Thurnher, Majda M.; Pallamar, M.; Trattnig, S.; Prayer, Daniela; Noebauer-Huhmann, Iris

doi:10.3174/ajnr.a3101

Cited by 14 publications

(9 citation statements)

References 25 publications

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“…Interventional imaging requires high temporal resolutions and rapid scan plane reorientations that can be achieved with parallel imaging reconstructions like GRAPPA [47,48]. Spine protocols are notoriously long but can be shortened two- or three-fold with GRAPPA [49–51]. GRAPPA has also been used to accelerate MRA exams [52,53].…”

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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“…14 Therefore, we measured the target tissue SI at the deeply located structure, similar to the previous studies that used cervical spinal cord as the target tissue. 20,21,29 Several prior studies that used parallel imaging measured the noise inside the subject (ie, not at the extracorporeal air) to adjust for the inhomogeneous distribution of noise. 14,24,27,28 Our study overcame this limitation induced by parallel TSE sequence such as motion-insensitive, thin-slice acquisition with 3dimensional reformation, the conventional TSE can be acquired in a shorter scan time with less susceptibility artifacts and less marginal blurring.…”

Section: Discussionmentioning

confidence: 99%

Image Quality of High-Resolution 3-Dimensional Neck MRI Using CAIPIRINHA-VIBE and GRASP-VIBE

et al. 2022

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Objectives: Acquiring high-quality magnetic resonance imaging (MRI) of the head and neck region is often challenging due to motion and susceptibility artifacts. This study aimed to compare image quality of 2 high-resolution three-dimensional (3D) MRI sequences of the neck, controlled aliasing in parallel imaging results in higher acceleration (CAIPIRINHA)-volumetric interpolated breath-hold examination (VIBE), and golden-angle radial sparse parallel imaging (GRASP)-VIBE. Materials and Methods: One hundred seventy-three patients indicated for contrast-enhanced neck MRI examination were scanned using 3 T scanners and both CAIPIRINHA-VIBE and GRASP-VIBE with nearly isotropic 3D acquisitions (<1 mm in-plane resolution with analogous acquisition times). Patients' MRI scans were independently rated by 2 radiologists using a 5-grade Likert scale for overall image quality, artifact level, mucosal and lesion conspicuity, and fat suppression degree at separate anatomical regions. Interobserver agreement was calculated using the Cohen κ coefficient. The quality ratings of both sequences were compared using the Mann-Whitney U test. Nonuniformity and contrast-to-noise ratio values were measured in all subjects. Separate MRI scans were performed twice for each sequence in a phantom and healthy volunteer without contrast injection to calculate the signal-to-noise ratio (SNR). Results: The scores of overall image quality, overall artifact level, motion artifact level, and conspicuity of the nasopharynx, oropharynx, oral cavity, hypopharynx, and larynx were all significantly higher in GRASP-VIBE than in CAIPIRINHA-VIBE (all P's < 0.001). Moderate to substantial interobserver agreement was observed in overall image quality (GRASP-VIBE κ = 0.43; CAIPIRINHA-VIBE κ = 0.59) and motion artifact level (GRASP-VIBE κ = 0.51; CAIPIRINHA-VIBE κ = 0.65). Lesion conspicuity was significantly higher in GRASP-VIBE than in CAIPIRINHA-VIBE ( P = 0.005). The degree of fat suppression was weaker in the lower neck regions in GRASP-VIBE (3.90 ± 0.72) than in CAIPIRINHA-VIBE (4.97 ± 0.21) ( P < 0.001). The contrast-to-noise ratio at hypopharyngeal level was significantly higher in than in CAIPIRINHA-VIBE (3.14 ± 9.95) ( P < 0.001). In the phantom study, the SNR of GRASP-VIBE was 12 times greater than that of CAIPIRINHA-VIBE. The in vivo SNR of the volunteer MRI scan was 13.6 in CAIPIRINHA-VIBE and 20.7 in GRASP-VIBE.Conclusions: Both sequences rendered excellent images for head and neck MRI scans. GRASP-VIBE provided better image quality, as well as mucosal and lesion conspicuities, with less motion artifacts, whereas CAIPIRINHA-VIBE provided better fat suppression in the lower neck regions.

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“…Penggunaan acceleration factor yang lebih tinggi dalam metode pencitraan parallel biasanya diikuti dengan penurunan Signal-to-Noise Rasio (SNR). Menurut Fruehwald-Pallamar et al, (2012) dengan menggunakan nilai acceleration factor 2 dan 3 pada teknik parallel imaging dapat menghasilkan citra yang baik dan waktu pemeriksaan yang lebih cepat. Disisi lain, menurut Blaimer et al, (2006) nilai acceleration factor 4 lebih banyak digunakan pada MRI kepala dan menghasilkan citra yang baik dengan scan time yang lebih cepat, tetapi pada penelitian ini peneliti ingin melakukan percobaan dengan menerapkan nilai acceleration factor 4 pada pemeriksaan MRI Lumbal dengan kasus HNP.…”

Section: Pendahuluanunclassified

Differences Ofacceleration Factor Application Toward Characteristics of Diagnostic Image T2wi Fse in Mri Lumbal Herniated Nucleus Pulosus (Hnp)case

Maulidya

Wibowo

Murniati

2018

jimed

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Background : Patients with HNP cases have a bigger chance to do a movement during MRI examination, and it causes poor MRI image. Quick time of MRI examination is needed to produce an optimal image. The technique of parallel imaging is a technique that can increase the speed of MRI data acquisition by passing through several lines of phase encoding in k-space. The GRAPPA technique is one of the methods used to reconstruct data on MRI parallel imaging techniques with better overall image quality. The technique of parallel imaging has a special parameter called acceleration factor. Acceleration factor (R-factor) will affect scan time. The purpose of this research is to know the difference of diagnostic image characteristic which is resulted in applying acceleration factor 2, 3 and 4 in parallel imaging of GRAPPA method and know the optimal acceleration factor to obtain MRI image of lumbar HNP case. Methods : This research type is quantitative research with descriptive approach. The study was conducted by MRI Siemens 3 T in RSUD Dr. Soedono Madiun. The data were 30 MRI images of lumbar sagittal of HNP cases on T2WI FSE with acceleration factor 2, 3 and 4 GRAPPA methods Result : The results of this study indicate that there are differences in diagnostic image characteristics in the application of acceleration factor 2 and 4, 3 and 4 with VGA test. Acceleration factor value optimal with VGC test known is acceleration factor 2 and 3 Conclusion : Based on the result there was differencediagnostic image characteristics of MRI Lumbar in sagital plane Fast Spin Echo (FSE)sequence with variation acceleration factor 2, 3 and 4 parallel imaging GRAPPA methode in case Herniated Nucleus Pulposus (HN0). Optimal value of variation acceleration factor value for MRI Lumbar examination of Heniated Nucleus Pulposus (HNP) is 2 dan 3.

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Parallel Imaging of the Cervical Spine at 3T: Optimized Trade-Off between Speed and Image Quality

Cited by 14 publications

References 25 publications

Recent advances in parallel imaging for MRI

Recent advances in parallel imaging for MRI

Image Quality of High-Resolution 3-Dimensional Neck MRI Using CAIPIRINHA-VIBE and GRASP-VIBE

Differences Ofacceleration Factor Application Toward Characteristics of Diagnostic Image T2wi Fse in Mri Lumbal Herniated Nucleus Pulosus (Hnp)case

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