Figure 7:

Quantitative image quality comparison of the optimized 3D T1 weighted turbo spin echo imaging on patients. The ‘acquired’, ‘le+denoised’ and ‘enhanced’ corresponds to the acquired image, linear enhanced image with wavelet denoising, and convolutional neural network (CNN) enhanced image, respectively. 8 different segments covering the major anterior and posterior intracranial vessels are analyzed. (A) The comparison of mean image gradient within a local vessel region indicating the image sharpness for vessel wall depiction. (B) The comparison of contrast-to-noise ratio (CNR) measurements between vessel wall and lumen. (C) The comparison of CNR measurements between vessel wall and background surrounding tissue. The red star/circle marker indicates the statistical significance (p < 0.05) in Mann-Whitney U-test between CNN enhanced method and acquired/linear enhanced and denoised method.