Search

He Sui,1,* Yu Gong,2,* Lin Liu,1 Zhongwen Lv,1 Yunfei Zhang,3 Yongming Dai,3 Zhanhao Mo1 1Department of Radiology, China-Japan Union Hospital of Jilin University, Changchun, People’s Republic of China; 2Medical Imaging Department, Linyi People’s Hospital, Linyi, People’s Republic of China; 3MR Collaboration, Central Research Institute, United Imaging Healthcare, Shanghai, People’s Republic of China*These authors contributed equally to this workCorrespondence: Zhanhao Mo, Department of Radiology, China-Japan Union Hospital of Jilin University, No. 126 Xiantai St., Erdao Dist., Changchun, People’s Republic of China, Email mozhanhao@jlu.edu.cnPurpose: To evaluate and compare the image quality and diagnostic accuracy of Artificial Intelligence-assisted Compressed Sensing (ACS) sequences for lumbar disease, as an acceleration method for MRI combining parallel imaging, half-Fourier, compressed sensing and neural network and routine 2D sequences for lumbar spine.Methods: We collected data from 82 healthy subjects and 213 patients who used 2D ACS accelerated sequences to examine the lumbar spine while 95 healthy subjects and 234 patients used routine 2D sequences. Acquisitions included axial T2WI, sagittal T2WI, T1WI, and T2-fs sequences. All obtained images of these subjects were analyzed in the light of calculating image quality factors such as signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) for selected regions of interest. The lumbar image quality, artifacts and visibility of lesion structure were assessed by two radiologists independently. Differences between the evaluation values above were tested for statistical significance by the Wilcoxon signed-ranks test. Inter-observer agreements of image quality between two radiologists were measured using Cohen’s kappa correlation coefficient.Results: The ACS accelerated sequences not only reduced the scanning time by 18.9%, but also retained basically the same image quality as

He Sui,1,* Jin Li,2,3,* Lin Liu,1 Zhongwen Lv,1 Yunfei Zhang,4 Yongming Dai,4 Zhanhao Mo1 1China-Japan Union Hospital of Jilin University, Changchun, People’s Republic of China; 2Jilin Province People’s Hospital, Changchun, People’s Republic of China; 3The Department of Trauma Surgery, Shanghai Oriental Hospital, Shanghai, People’s Republic of China; 4Central Research Institute, United Imaging Healthcare, Shanghai, 201800, People’s Republic of China*These authors contributed equally to this workCorrespondence: Zhanhao Mo, China-Japan Union Hospital of Jilin University, No. 126 Xiantai Street, Erdao District, Changchun, People’s Republic of China, Email mozhanhao@jlu.edu.cnPurpose: The three-dimensional (3D) sequence of magnetic resonance imaging (MRI) plays a critical role in the imaging of musculoskeletal joints; however, its long acquisition time limits its clinical application. In such conditions, compressed sensing (CS) is introduced to accelerate MRI in clinical practice. We aimed to investigate the feasibility of an isotropic 3D variable-flip-angle fast spin echo (FSE) sequence with CS technique (CS-MATRIX) compared to conventional 2D sequences in knee imaging.Methods: Images from different sequences of both the accelerated CS-MATRIX and the corresponding conventional acquisitions were prospectively analyzed and compared. The signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) of the structures within the knees were measured for quantitative analysis. The subjective image quality and diagnostic agreement were compared between CS-MATRIX and conventional 2D sequences. Quantitative and subjective image quality scores were statistically analyzed with the paired t-test and Wilcoxon signed-rank test, respectively. Diagnostic agreements of knee substructure were assessed using Cohen’s weighted kappa statistic.Results: For quantitative analysis, images from the CS-MATRIX sequence showed a significantly higher SNR than T2