ABSTRACT
Objective:To explore the optimal acceleration factor and feasibility of the compressed SENSE (CS) technique in non-contrast MR coronary angiography (NMRCA) for clinical practice.Methods:The image data of completed coronary CTA and 3.0 T NMRCA sequence in 31 patients with suspected coronary heart disease were prospectively recruited at Fuyang People′s Hospital from August 2021 to November 2021. NMRCA sequences included conventional SENSE2 sequence and CS sequences with acceleration factors of 4, 5, and 6, respectively. The subjective scores of image quality and the objective scores, the contrast ratios between assessed coronaries and myocardium (CMCR) were compared among the 4 groups using the Friedman and Wilcoxon rank sum test.Results:Compared with the conventional SENSE2 [(343±46)s], the scan time of CS4 (269±36), CS5 (214±29) and CS6 (178±26) s were shortened by 21.5%, 37.5% and 48.0%, respectively. There was a good consistency between the subjective scores of the four groups (Kappa=0.769, 95% Cl 0.738-0.800). There was no significant difference in subjective score and CMCR value between CS4 and SENSE2 ( P>0.05). The coronary artery segments of CS5 and CS6 were significantly different from SENSE2 group ( P<0.05). Conclusions:For 3.0 T NMRCA, CS technology shows high feasibility. The CS4 can reduce imaging time while ensuring high-quality coronary arterial images, which has a well-established clinical application value for NMRCA.
ABSTRACT
Objective: To investigate the feasibility of three dimensional MRI (3D-MRI) based on compressed sensing (CS) in knee joint imaging and its value in assessing meniscal injuries. Methods: Knee MRI were performed on 26 patients with suspected knee injury (injured group) and 30 healthy volunteers (control group). Conventional fat saturation proton density-weighted imaging (fsPDWI) and CS-3D-MRI were collected. The results of arthroscopy of injured group were recorded. MRI of the right knee were obtained in control group, then CS-3D-MRI were reconstructed with 3 different denosing (DS) levels (CS-DSweak, CS-DSmedium, CS-DSstrong), and the sagittal image quality was evaluated subjectively and objectively. Patients in injured group received MRI before arthroscopy. CS-3D-MRI of injured group were reconstructed with CS-DSmedium, and the consistency of CS-3D-MRI diagnostic results with those of arthroscopy was analyzed. Results: For images of control group, there was no statistical difference of the quality scores of reconstructed CS images of different DS levels and fsPDWI (Z=0.35, P=0.32), while statistically significant differences of signal-to-noise ratio (SNR) and contrast-to-noise ratio (CNR) were found in images obtained with 4 different sequences (F=36.01, 9.62, both P0.05). CS-3D-MRI diagnosed meniscus injuries in all patients in injury group, highly consistent with results of arthroscopy (Kappa=0.94, P<0.01). Conclusion: Based on CS technique, 3D-MRI could be used for knee joint imaging, which was able to shorten scanning time on the premise of ensuring image quality, therefore had good value for evaluation on meniscus injuries.