Abdominal MRI at 3.0 T: LAVA‐flex compared with conventional fat suppression T1‐weighted images

Li, Xing Hui; Zhu, Jiang; Zhang, Xiao Ming; Ji, Yi Fan; Chen, Tian Wu; Huang, Xiao; Yang, Lin; Zeng, Nan

doi:10.1002/jmri.24329

Cited by 37 publications

(33 citation statements)

References 37 publications

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“…Therefore, measurement of fat using the "fatonly" image can be measured quantitatively with more accuracy than several other MR adipose tissue imaging methods previously introduced. Moreover, in addition to the information of the amount of body adipose tissue, abnormal conditions of the internal organs can be determined through the contrast of a variety of soft tissues [47,54]. Even in a subject of this study, intra-hepatic abnormal lesion was found in the "water-only" image, which led to a definite diagnosis through additional medical interventions (Fig.…”

Section: Discussionmentioning

confidence: 79%

Assessment of The Accuracy of The MR Abdominal Adipose Tissue Volumetry using 3D Gradient Dual Echo 2-Point DIXON Technique using CT as Reference

Kang¹

2016

Journal of Magnetics

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In this study, in order to determine the validity and accuracy of MR imaging of 3D gradient dual echo 2-point DIXON technique for measuring abdominal adipose tissue volume and distribution, the measurements obtained by CT were set as a reference for comparison and their correlations were evaluated. CT and MRI scans were performed on each subject (17 healthy male volunteers who were fully informed about this study) to measure abdominal adipose tissue volume. Two skilled investigators individually observed the images acquired by CT and MRI in an independent environment, and directly separated the total volume using region-based thresholding segmentation method, and based on this, the total adipose tissue volume, subcutaneous adipose tissue volume and visceral adipose tissue volume were respectively measured. The correlation of the adipose tissue volume measurements with respect to the observer was examined using the Spearman test and the interobserver agreement was evaluated using the intra-class correlation test. The correlation of the adipose tissue volume measurements by CT and MRI imaging methods was examined by simple regression analysis. In addition, using the Bland-Altman plot, the degree of agreement between the two imaging methods was evaluated. All of the statistical analysis results showed highly statistically significant correlation (p<0.05) respectively from the results of each adipose tissue volume measurements. In conclusion, MR abdominal adipose volumetry using the technique of 3D gradient dual echo 2-point DIXON showed a very high level of concordance even when compared with the adipose tissue measuring method using CT as reference.

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Section: Discussionmentioning

confidence: 79%

Assessment of The Accuracy of The MR Abdominal Adipose Tissue Volumetry using 3D Gradient Dual Echo 2-Point DIXON Technique using CT as Reference

Kang¹

2016

Journal of Magnetics

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“…The contrast between muscle and fat and between the liver and pathologic lesions were significantly better in the LAVA-Flex sequence than that in FSPGR. This study also revealed that the LAVA-Flex sequence offers superior and more homogenous fat suppression in the abdomen compared to the FSPGR sequence [14].…”

Section: Introductionmentioning

confidence: 92%

“…1 [3,14]. First, circular (21.3 ± 16.1 mm 2 ) ROIs were placed in the superficial fat at eight locations (up, down, left, right, up left, up right, down left, and down right).…”

Section: Data Processingmentioning

confidence: 99%

“…First, circular (21.3 ± 16.1 mm 2 ) ROIs were placed in the superficial fat at eight locations (up, down, left, right, up left, up right, down left, and down right). Next, the standard deviation (SD) and mean value of these eight measurements of the SI were calculated [3,14]. The percentage SD (%SD) was calculated using the following equation: %SD (%) = 100 9 SD of the eight ROIs/mean value of the SI in the eight ROIs.…”

Section: Data Processingmentioning

confidence: 99%

“…LAVA-flex reconstructs pure water and fat images in seconds by applying a two-point Dixon method to data from in-phase and out-of-phase images [12,13]. A previous report investigated the efficacy of fat suppression and compared the image quality of water-only images generated using LAVA-flex with fast spoiled gradient-recalled (FSPGR) T 1 -weighted CHESS fat-suppressed images obtained in patients undergoing abdominal 3.0-T MRI [14]. The contrast between muscle and fat and between the liver and pathologic lesions were significantly better in the LAVA-Flex sequence than that in FSPGR.…”

Section: Introductionmentioning

confidence: 99%

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Liver acquisition with volume acceleration flex on 70-cm wide-bore and 60-cm conventional-bore 3.0-T MRI

Saito

Tanaka

Hashido

2016

Radiol Phys Technol

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This study aimed to compare the uniformity of fat suppression and image quality between liver acquisition with volume acceleration flex (LAVA-Flex) and LAVA on 60-cm conventional-bore and 70-cm wide-bore 3.0-T magnetic resonance imaging (MRI). The uniformity of fat suppression by LAVA-Flex and LAVA was assessed as the efficiency of suppression of superficial fat at the levels of the liver dome, porta, and renal hilum. Percentage standard deviation (%SD) was calculated using the following equation: %SD (%) = 100 × SD of the regions of interest (ROIs)/mean value of the signal intensity (SI) in the ROIs. Signal-to-noise ratio (SNR) and contrast ratio (CR) were calculated. In the LAVA sequence, the %SD in all slices on wide-bore 3.0-T MRI was significantly higher than that on conventional-bore 3.0-T MRI (P < 0.01). However, there was no significant difference in fat signal uniformity between the conventional and wide-bore scanners when LAVA-Flex was used. In the liver, there were no significant differences in SNR between the two sequences. However, the SNR in the pancreas was lower for the wide-bore scanner than for the conventional-bore scanner for both sequences (P < 0.05). There were no significant differences in CR for the liver and fat between LAVA-Flex and LAVA in both scanners. The CR in the LAVA-Flex images obtained by wide-bore MRI was significantly higher than that in the LAVA-Flex images recorded by conventional-bore MRI (P < 0.001). LAVA-Flex offers more homogenous fat suppression in the upper abdomen than LAVA for both conventional and wide-bore 3.0-T MRI.

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Diffusion-weighted MRI in Crohn's disease: Current status and recommendations

Dohan

Taylor

Hoeffel

et al. 2016

J. Magn. Reson. Imaging

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Over the past years, technological improvements and refinements in magnetic resonance imaging (MRI) hardware have made high-quality diffusion-weighted imaging (DWI) routinely possible for the bowel. DWI is promising for the detection and characterization of lesions in Crohn's disease (CD) and has been advocated as an alternative to intravenous gadolinium-based contrast agents. Furthermore, quantification using the apparent diffusion coefficient may have value as a biomarker of CD activity and has shown promise. In this article we critically review the literature pertaining to the value of DWI in CD for detection, characterization, and quantification of disease activity and complications. Although the body of supportive evidence is growing, it is clear that well-designed, multicenter studies are required before the role of DWI in clinical practice can be fully established. J. Magn. Reson. Imaging 2016;44:1381-1396.

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Abdominal MRI at 3.0 T: LAVA‐flex compared with conventional fat suppression T1‐weighted images

Abstract: The LAVA-Flex sequence offers superior and more homogenous fat suppression of the abdomen than does the FSPGR sequence. The fat-only phase can be a simple and effective method of assessing fatty liver.

Cited by 37 publications

References 37 publications

Assessment of The Accuracy of The MR Abdominal Adipose Tissue Volumetry using 3D Gradient Dual Echo 2-Point DIXON Technique using CT as Reference

Assessment of The Accuracy of The MR Abdominal Adipose Tissue Volumetry using 3D Gradient Dual Echo 2-Point DIXON Technique using CT as Reference

Liver acquisition with volume acceleration flex on 70-cm wide-bore and 60-cm conventional-bore 3.0-T MRI

Diffusion-weighted MRI in Crohn's disease: Current status and recommendations

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