C-2
Head End:
Looking at the front side of the table, the head of the patient is at the left end of the
table. With reference to film, it is the side of the film closest to the head end of the
table.
Foot End:
Looking at the front side of the table, the feet of the patient are at the right end of
the table. With reference to film, it is the side of the film closest to the foot end of
the table.
ILLUSTRATION C-2
HEAD/FOOT
1-2
System Terms
SID
Source-to-Image
Distance
The distance, in inches or centimeters, from the X–ray tube focal spot to the X–ray
receptor image plane.
SOD
Source-Object Distance
The distance, in inches or centimeters, from the X–ray tube focal spot to the anat-
omy of interest.
Field of View (FOV)
The size of the viewed image from the image intensifier. Depending on the size of
the image intensifier this can be 16, 12, 9, 6, or 4.5 inches.
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