医学影像物理学科的现状和未来

医学影像物理学是医学物理学的重要分支．该专业的主要目标是培养研发高精密医学影像设备的骨干和医疗机构内的医学物理师，以及发展该学科专业的科研和教学人才．建立医学物理学科，发展医学影像物理专业是我国计划于2020年成为世界制造业和软件业大国的重要内容之一．中国目前还没有建立医学物理学科，在研发水平、教学和培训水平以及产业的规模上都还非常小，国家必须采取重大决策才能加速这个领域的发展．为了赶上发达国家在这个领域的发展水平，进而成为世界医学影像设备的制造大国，最紧迫的问题之一是建立中国的医学物理学科和医学物理师制度．文章在综述医学影像学科发展的同时，分析了该学科今后发展的社会需求和发展前景，为建立中国的医学物理学科和医学物理师制度提供依据．     

Phase-sensitive fat suppression steady-state free procession sequence with phase correction

Robust and fast fat suppression is a challenge in balanced steady-state free precession （SSFP） magnetic resonance imaging. Although single-acquisition phase-sensitive SSFP can provide fat-suppressed images in short scan time, phase errors, especially spatially-dependent phase shift, caused by a variety of factors may result in misplacement of fat and water voxels. In this paper, a novel phase correction algorithm was used to calibrate those phase errors during image reconstruction. This algorithm corrects phase by region growing, employing both the magnitude and the phase information of image pixels. Phantom and in vivo imagings were performed to validate the technique. As a result, excellent fat-suppressed images were acquired by using single-acquisition phase-sensitive SSFP with phase correction.