The human sectional specimens were made by the Anatomy Department of Shandong University Medical College with frozen section technique. The sectional thickness of the head and limbs was 8mm, and that of the trunk was10 mm.. The transverse section of the head is made with the canthus line as the baseline, the sagittal section of the head is parallel to the median sagittal plane, and the coronal section of the head is perpendicular to the canthus line.
CT and MRl images are taken from living bodies and made by the Radiology Department of Qilu Hospital of Shandong University and Shandong Institute of Medical Imaging. CT scanners are spiral CT and multi-slice spiral CT, and the field intensity of MRl scanner is1.5t..
It should be pointed out that Dr. Gao Bo, Dr. Lin Xiangtao and Dr. Liu Xuejing provided cT and MRl images of their own bodies regardless of the damage of X-rays to tissues.