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• Technical Article •
Application of compressed sensing combined with parallel acqusition technique of breath-holding 3D LAVA FLEX sequence in rapid magnetic resonance imaging of liver
FANG Zirong  CHEN Qiuyan  YE Ling  YU Bo  CHEN Zhijian 

Cite this article as: FANG Z R, CHEN Q Y, YE L, et al. Application of compressed sensing combined with parallel acqusition technique of breath-holding 3D LAVA FLEX sequence in rapid magnetic resonance imaging of liver[J]. Chin J Magn Reson Imaging, 2024, 15(2): 155-161. DOI:10.12015/issn.1674-8034.2024.02.023.


[Abstract] Objective To investigate the application of compressed sensing (CS) with different acceleration factors (AF) and combined with parallel acqusition technique (PAT) of three-dimensional liver acqusition with volume acceleration flexible (3D LAVA FLEX) breath-holding sequence in rapid magnetic resonance imaging of liver.Materials and Methods A total of 28 healthy subjects were recruited for liver MRI scan using breath-holding 3D LAVA FLEX sequence combined with PAT AF 2 and CS with different AF at GE Architect 3.0 T MR scancer. The scanning sequences were divided into PAT 2 group and CS 1.2, CS 1.5, CS 2, CS 2.4 group based on PAT 2. Two observers were subjectively rated a 5-point scale on the image quality of water phase, in-phase (IP) and opposed-phase (OP) of liver. In the same slice of porta hepatis, the regions of interest (ROI) were placed on the anterior and posterior segments of the right hepatic lobe, the inner and outer segments of the left hepatic lobe, and the right erector spinae. The signal intensity (SI) value of each ROI and the standard deviationg (SD) value of erector spinae were recorded, and calculated the signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR). Inter-class correlation cofficient (ICC) was used to analyze the consistency of subjective scores and measurement data of the two observers. Kruskal-Wallis H test was used to analyze the differences among subjective scores. One-way analysis of variance (ANOVA) was used to compare the differences of SNR and CNR among different groups.Results There was good agreement between the two observers on the subjective score of image quality and the measured data (ICC>0.75). There was significant difference in subjective evaluation among the five groups of water phase, IP and OP images (P<0.001, P<0.001, P<0.001). There was significant difference in the SNR of the right anterior and posterior lobe and the inner and outer segments of the left lobe among the five groups (P<0.001, P=0.004, P=0.002, P<0.001), but there was no significant difference in the CNR among the five groups (P=0.802, P=0.979, P=0.772, P=0.910).When CS AF=2.4, the subjective scores of water phase, IP and OP images were significantly different from those in the regular PAT 2 group (P=0.009, P<0.001, P<0.001), and the SNR in the anterior and posterior segments of the right hepatic lobe,the inner and outer segments of the left hepatic lobe were significantly different from those in the conventional PAT 2 group (P=0.010, P=0.002, P<0.001, P<0.001).Conclusions With the increase of CS AF, the scanning time was gradually shortened. Under the premise of ensuring image quality, CS AF 2 was clinically recommended as the scanning parameter of liver dynamic enhancement and IP, OP imaging for breath-holding 3D LAVA FLEX sequence based on PAT AF 2, and the scanning time was reduced by 44% compared with the regular scanning scheme of PAT AF 2, and the imaging efficiency was greatly improved.
[Keywords] liver；image quality；compressed sensing；parallel acqusition technique；acceleration factor；magnetic resonance imaging

FANG Zirong   CHEN Qiuyan*   YE Ling   YU Bo   CHEN Zhijian  

Department of Radiology, the Affliated Ningde Municipal Hospital of Ningde Normal University, Ningde 352100, China

Corresponding author: CHEN Q Y, E-mail: lc7505723@163.com

Conflicts of interest   None.

Received  2023-05-26
Accepted  2024-01-25
DOI: 10.12015/issn.1674-8034.2024.02.023
Cite this article as: FANG Z R, CHEN Q Y, YE L, et al. Application of compressed sensing combined with parallel acqusition technique of breath-holding 3D LAVA FLEX sequence in rapid magnetic resonance imaging of liver[J]. Chin J Magn Reson Imaging, 2024, 15(2): 155-161. DOI:10.12015/issn.1674-8034.2024.02.023.

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