Fig. 1. Network structure diagram. (a) SU-net structure; (b) convolutional modulation module

Fig. 2. Test result images. (a)-(e) and (k)-(o) are ground truth image, FBP, NSM, ESRGAN, and SU-net reconstruction images, respectively; (f)-(j) are partial enlarged images of (a)-(e), respectively; (p)-(t) are partial enlarged images of (k)-(o), respectively. Display window is [0, 0.35] cm^-1

Fig. 3. Quantitative index. (a) PSNR; (b) RMSE; (c) FSIM

Fig. 4. Experimental results outside dataset. (a)-(e) are ground truth image, FBP, NSM, ESRGAN, and SU-net reconstruction images, respectively; (f)-(j) are partial enlarged images of (a)-(e), respectively. Display window is [0, 0.35] cm^-1

Fig. 5. Results of actual experiment. (a)-(d) are reconstruction results of FBP, NSM, ESRGAN, and SU-net in line 600, respectively; (e)-(h) are partial enlarged images of (a)-(d), respectively; (i)-(l) are reconstruction results of FBP, NSM, ESRGAN, and SU-net in line 650, respectively; (m)-(p) are partial enlarged images of (i)-(l), respectively. Display window is [0, 0.35] cm^-1