Distortion size / shape Flashcards
as the tube is angled more (cephalic or caudal) the elongation effect increases
Increased Angulation
the central ray must e perpendicular to both the image receptor
Proper Alignment
size distortion increases as OID increases
Object-to-image Distance
size distortion decreases as SID increases
Source-to-image Distance
when object is farther from the image receptor the xray diverge more before reaching the receptor
OID object to image distance
increasing the distance between the xray source and the image receptor reduces the divergence of the xray beam
SID source to image distance
decreased ___ causes more divergence of the beam
SID
decreased ___ minimizes magnification and produces a more accurate representation
OID
tilting the image receptor while maintaining the part and xray tube in the correct position
Image Receptor Angulation
the image receptor should be parallel to the object being imaged to avoid this distortion
Proper positioning
(IRA)
misalignment of the body part relative to the xraybeam and image receptor
Part Angulation
occurs when the part is angled while the central ray reamins perpendicular to the image receptor
foreshortening
the body part should be parallel to the image receptor to avoid this distortion
proper positioning
