Dual-Source Parallel RF Transmission for Clinical MR Imaging of the Spine at 3.0 T: Intraindividual Comparison with Conventional Single-Source Transmission

Nelles, Michael; König, R.; Gieseke, Jürgen; Battum, Marjolijn M. Guerand-van; Kukuk, G; Schild, Hans H.; Willinek, Winfried A.

doi:10.1148/radiol.10092146

Cited by 57 publications

(45 citation statements)

References 17 publications

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“…17 In 3T spine imaging, it has been reported to reduce the total examination time, and to improve B 1 1 homogeneity and flip angle accuracy by using RF shimming. 18,19 The drawback of these methods are requirements for specialized hardware and software. However, MRI analysis in this study could be performed with RF shimming using four ports.…”

Section: Discussionmentioning

confidence: 99%

Simple modification of arm position improves B₁⁺ and signal homogeneity in the thoracolumbar spine at 3T

Ishizaka

Kudo

Harada

et al. 2017

Magnetic Resonance Imaging

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Purpose: To evaluate the homogeneity of the radiofrequency magnetic field (B 1 1 ) and signal intensity using different arm positions during 3T thoracolumbar spinal imaging. Materials and Methods: Twenty volunteers were scanned with a four-channel radiofrequency (RF) transmit coil at 3T, with arms on the bed (conventional), arms elevated by 100 mm (arm lift), or with the arms-up position (elevated arm). Axial B 1 1 maps and sagittal T 1 -weighted image (T 1 WI)-performed RF shimming were obtained for each arm position. The mean and standard deviation (SD) of the flip angle (FA) at the center of the vertebra on each B 1 1 map, and contrast noise ratios (CNRs) between the spinal cord and cerebrospinal fluid of sagittal T 1 WI, were calculated and compared among the different arm positions. Results: Mean FA values (degrees) for the arm lift and elevated arm positions were significantly larger than for the conventional position (P < 0.001 for both) at the twelfth thoracic vertebra (Th12). FA SD values for the arm lift and elevated arm position were significantly smaller than for the conventional position (P < 0.001 for both) at Th12. CNR for the arm lift and elevated arm position were significantly higher than for the conventional position (P 5 0.007 and 0.002, respectively). The mean and SD of the FA and the CNR did not differ significantly for the arm lift and elevated arm positions (P 5 0.591, 0.958, and 0.927, respectively). 3Tmagnetic resonance imaging (MRI) has several advantages such as higher spatial and temporal resolution. Based on such advantages, many clinical applications of 3T MRI have been reported. 1-3 Spine imaging has been among the more frequent applications. [4][5][6] However, the RF distribution becomes more inhomogeneous in body imaging at 3T than at 1.5T, because the RF wavelength at 3T is only half as large as that at 1.5T. 7,8 In particular, the signal decrease due to local RF field inhomogeneity in abdominal imaging is caused by the dielectric resonance effect or standing-wave effect. 8,9 These B 1 1 inhomogeneities have been also reported at the thoracolumbar junction in spine imaging.10

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Section: Discussionmentioning

confidence: 99%

Simple modification of arm position improves B₁⁺ and signal homogeneity in the thoracolumbar spine at 3T

Ishizaka

Kudo

Harada

et al. 2017

Magnetic Resonance Imaging

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“…With parallel imaging, it can be assumed that shorter sequences are less prone to artifacts and that motion artifacts decrease, which is another advantage when imaging patients who find it difficult to lie still. 28 A limitation of our study was the lack of a histologic correlation of the pathologic findings, which was not possible in this study group. A further limitation is the small number of 26 patients, but we think we have proved the clinical feasibility of parallel imaging by analyzing additional anatomic details in the volunteers, which increased the study population to 36 individuals.…”

Section: Discussionmentioning

confidence: 90%

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

Fruehwald-Pallamar¹,

Szomolányi

Fakhrai³

et al. 2012

AJNR Am J Neuroradiol

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“…Independent dual-source parallel transmission of the RF pulse (dual-source parallel RF transmission) has been implemented in 3.0-T MR scanners of the latest generation to ameliorate B1-field uniformity and to reduce dielectric image artifacts. Previous studies demonstrated that improved B1-field uniformity significantly enhances image quality in abdominal, spinal, cardiac, and female breast examinations at 3.0 T [24][25][26][27][28].…”

Section: Discussionmentioning

confidence: 99%

Dual-source RF transmission in cardiac SSFP imaging at 3 T: systematic spatial evaluation of image quality improvement compared to conventional RF transmission

et al. 2015

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Dual-Source Parallel RF Transmission for Clinical MR Imaging of the Spine at 3.0 T: Intraindividual Comparison with Conventional Single-Source Transmission

Abstract: While shortening examination times by approximately one-third, the dual-source parallel RF transmission mode in MR imaging of the spine yielded diagnostic image quality comparable to that with the conventional single-source RF transmission mode.

Cited by 57 publications

References 17 publications

Simple modification of arm position improves B₁⁺ and signal homogeneity in the thoracolumbar spine at 3T

Simple modification of arm position improves B₁⁺ and signal homogeneity in the thoracolumbar spine at 3T

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

Dual-source RF transmission in cardiac SSFP imaging at 3 T: systematic spatial evaluation of image quality improvement compared to conventional RF transmission

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Dual-Source Parallel RF Transmission for Clinical MR Imaging of the Spine at 3.0 T: Intraindividual Comparison with Conventional Single-Source Transmission

Abstract: While shortening examination times by approximately one-third, the dual-source parallel RF transmission mode in MR imaging of the spine yielded diagnostic image quality comparable to that with the conventional single-source RF transmission mode.

Cited by 57 publications

References 17 publications

Simple modification of arm position improves B1+ and signal homogeneity in the thoracolumbar spine at 3T

Simple modification of arm position improves B1+ and signal homogeneity in the thoracolumbar spine at 3T

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

Dual-source RF transmission in cardiac SSFP imaging at 3 T: systematic spatial evaluation of image quality improvement compared to conventional RF transmission

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Simple modification of arm position improves B₁⁺ and signal homogeneity in the thoracolumbar spine at 3T

Simple modification of arm position improves B₁⁺ and signal homogeneity in the thoracolumbar spine at 3T