Study on sex differences and potential clinical value of three-dimensional computerized tomography pelvimetry in rectal cancer patients

Table 2 Soft tissue measurement parameters and definitions

Parameter name	Definition
Rectal area (a)	Area of the rectum at the level of the ischial spine
Mesorectal fat area (b)	Area of the mesorectal fat at the level of the ischial spine
Visceral fat area (c)	Area of visceral fat at the level of the umbilicus
Subcutaneous fat area (d)	Area of subcutaneous fat at the level of the umbilicus
Waist circumference (e)	Circumference of the waist at the level of the umbilicus
Anterior-posterior abdominal diameter (RS)	It refers to the distance measured from the line connecting the umbilicus to the spinous process at the level of the umbilicus, between the abdominal wall section and the lumbar section
Transverse abdominal diameter (TU)	It refers to the distance measured from the level of the umbilicus to the horizontal line at the anterior edge of the lumbar vertebrae