Application of compressed sensing technology in two-dimensional magnetic resonance imaging of the ankle joint

doi:10.12307/2023.205

Abstract

Abstract: BACKGROUND: At present, there are few reports on the application of compressed sensing technology in ankle MRI.
OBJECTIVE: To investigate the effect of different acceleration factors in compressed sensing (CS) on image quality and scanning time of conventional 2D-MRI of the ankle joint.
METHODS: Totally 24 healthy volunteers (38 ankles) underwent conventional 2D-TSE sequence scanning at 3.0T MR. Based on SENSE parallel imaging (S group) and compressed sensing technique (CS group), sequence images of T1WI-TRA (S1.3, CS1.3, CS1.9, CS2.7), PDWI-Dixon-SAG (S1.8, CS1.8, CS2.6, CS3.2) and PDWI-SPAIR-COR (S1.3, CS1.3, CS1.6, CS2.0) were obtained separately. Other scan parameters of each sequence remained consistent. The tendon, cartilage, ligament and muscle structures of the ankle joint images were subjectively scored by 5 points. The standard deviation of background noise and signal intensity of bone, cartilage, ligament, tendon, muscle, effusion and fat structures were measured, and the signal-to-noise ratio and contrast-to-noise ratio were calculated. The subjective score and objective evaluation of different acceleration factor images were statistically analyzed. SENSE group was used as the standard reference for the image quality of each sequence.
RESULTS AND CONCLUSION: (1) When acceleration factor was the same, there were no statistically significant differences in subjective score, signal-to-noise ratio and contrast-to-noise ratio between the S group and the CS group (P > 0.05). (2) The acceleration factor of CS (TRA), CS (SAG) and CS (COR) sequences at CS1.9, CS2.6 and CS1.6 showed no significant difference in the image quality of cartilage, tendon, ligament and other main observed structures of the ankle joint (P > 0.05), and the scanning time was 1 minute and 32 seconds, 1 minute and 42 seconds, 1 minute and 48 seconds, respectively. When the acceleration factor of CS (TRA), CS (SAG) and CS (COR) sequences increased to CS2.7, CS3.2 and CS2.0, respectively, the subjective scores of all anatomical structures were still greater than 3, but signal-to-noise ratio and contrast-to-noise ratio of each sequence decreased significantly (P < 0.05). (3) These findings confirm that when acceleration factor is the same, compared with CS group, the image quality obtained by CS group is generally higher than that of S group. When acceleration factor increases, the scanning time of CS sequence decreases gradually, and the image quality also decreases. On a 3.0T MR, CS technology recommended CS1.9, CS2.6, and CS1.6 accelerators for conventional 2D sequences T1WI-TRA, PDWI-Dixon-SAG, and PDWI-SPAIR-COR, respectively, reducing the overall time by about 27% (1 minute and 53 seconds).

Key words: magnetic resonance imaging, ankle joint, compressed sensing, acceleration factor, image quality

CLC Number:

Du Xueting, Zhang Xiaodong, Chen Yanjun, Wang Mei, Chen Wubiao, Huang Wenhua. Application of compressed sensing technology in two-dimensional magnetic resonance imaging of the ankle joint[J]. Chinese Journal of Tissue Engineering Research, 2023, 27(9): 1396-1402.

Figures/Tables 7

结果如下：①在相同方位序列下，当S组和CS组的加速因子相同时，两组间骨、肌腱、软骨、韧带、液体、脂肪、肌肉信噪比的比较差异无显著性意义(P > 0.05)，且总体上来说，CS组的信噪比和对比噪声比大于S组；②在轴位T1WI序列上，当加速因子从CS1.3增加到CS2.7时，两组间肌腱信噪比的比较差异无显著性意义(P > 0.05)，骨、肌肉、脂肪和韧带的信噪比逐渐降低(P < 0.05)，韧带/脂肪和韧带/肌腱的对比噪声比逐渐降低(P < 0.05)；③在矢状位PDWI序列上，当加速因子从CS1.8增加到CS3.2时，两组间肌腱信噪比的比较差异无显著性意义(P > 0.05)，而骨、软骨、韧带、液体、脂肪、肌肉的信噪比逐渐降低(P < 0.05)，软骨/骨和软骨/积液的对比噪声比逐渐降低(P < 0.05)；④在冠状位PDWI序列上，当加速因子从CS1.3增加到CS2.0时，两组间肌腱信噪比的比较差异无显著性意义(P > 0.05)，而骨、软骨、脂肪和肌肉的信噪比逐渐降低(P < 0.05)，肌腱/软骨和肌腱/骨的对比噪声比逐渐降低(P < 0.05)。 2.4 扫描时间随着加速因子的增大，踝关节常规序列扫描时间减少，以SENSE并行技术的扫描时间为基准，CS扫描时间减少量计算如公式(3)：扫描时间减少量=(S组扫描时间-CS组扫描时间)/S组扫描时间×100% (3) 踝关节轴位T1WI序列采用S1.3、CS1.3、CS1.9、CS2.7的扫描时间及减少量分别是2 min 13 s、2 min 13 s、1 min 32 s(减少31%)、1 min 5 s(减少51%)；矢状位PDWI序列采用S1.8、CS1.8、CS2.6、CS3.2的扫描时间及减少量分别是2 min 30 s、2 min 30 s、1 min 42 s(减少32%)、1 min 18 s(减少48%)；冠状位PDWI序列采用S1.3、CS1.3、CS1.6、CS2.0的扫描时间及减少量分别是2 min 12 s、2 min 12 s、1 min 48 s(减少18%)、1 min 24 s(减少36%)。 "

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