Computerized Attenuation Correction of Liver SPECT Images Using Extended 3D-pix2pix Model with Bidirectional Learning - Ojima, Takaki; Nakayama, Ryohei; Hizukuri, Akiyoshi; Tomita, Yoya; Ichikawa, Yasutaka; Sakuma, Hajime (Journal of Signal Processing, 2025)