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1·The anorectal line, the point of rectum passing through the pelvic diaphragm and the coccygeal tip are almost at the same level.

肛直肠线、直肠盆膈结合部与尾骨尖几乎处于同一个平面上。

2·Routine CT scanning was carried out ranging from diaphragm to pelvic entrance, sometime suitable CT scan range was added in line with clinical need.

常规CT扫描范围从膈下至盆腔入口，有病变时酌情增加扫描平面。