Application of Color Doppler Imaging of Portal Vein Based on Iterative Reconstruction Algorithm in the Diagnosis of Exercise-Induced Abdominal Pain

Abstract

This study was to explore the application of a 50% iterative reconstruction algorithm in the diagnosis of exercise-induced abdominal pain (AP) with color Doppler imaging, the changes of liver and gallbladder, and portal vein before and after the exercise. 108 students with exercise-induced AP caused by mid- and long-distance running from May 30, 2019, to April 15, 2020, were selected as the research objects in this study. They were performed with the color Doppler flow image (CDFI). An iterative reconstruction (IR) with a weight of 50% was adopted for image reconstruction, and the reconstructed images were evaluated subjectively and objectively. Then, the maximum liver diameter (MLD), gallbladder width (GW), and portal vein diameter (PVD) were recorded before and after the exercise. The results showed that the SNR and CNR after ultrasound image reconstruction (UIR) (1.07 ± 0.58 and 3.59 ± 0.61, resp.) were increased greatly in contrast to the values before the UIR (7.36 ± 1.15 and 1.07 ± 0.58, resp.) ( p < 0.05 ); the score after the UIR (4.38 ± 0.59) was obviously higher than that before the UIR (3.52 ± 0.41) ( p < 0.05 ); the MLD of the subject at the 12th minute during the exercise was observably smaller than that at the 0th minute ( p < 0.05 ) while the MLD of the subject at the 12th minute after the exercise was greatly larger than that at the 0th minute ( p < 0.05 ); the GW of the subject during and after the exercise was not changed considerably; and the PVD of the subject at the 12th minute during the exercise was larger greatly than that at the 0th minute ( p < 0.05 ). In short, the quality of the reconstructed image based on the IR and noise index was better than that of the original ultrasound image because the interference of artifacts and noise was reduced. After exercise, the liver volume decreased, while the PVD increased, resulting in exercise-induced AP.

Construction and simulation of a joint scale model for power electronic converters based on wavelet decomposition and reconstruction algorithms

“…The minimum lethal dose of subjects in the 12th minute during exercise was significantly less than that in the 0th minute. However, the minimum lethal dose of subjects at 12th minute after exercise was significantly greater than that at 0th minute, reducing artifacts and noise interference [16]. Zhang Y et al proposed a RA using an improved two-step transformation in interleaved SAR mode.…”

“…Eq (16) represents the joint scale simulation model of DAB-SST. A simulation model is constructed based on the joint scale model of DAB-SST, with an input voltage of u i = 120 sin, a switching frequency of 850Hz for each switching device, and a switching period of T = 1.30ms.…”