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Exposure Factors

Chapter 29 - Distortion

QuestionAnswer
Longitudinal angulation in which the tube is angled toward the patient's feet Caudad
Longitudinal angulation in which the tube is angled toward the patient's head Cephalad
One of the geometric properties affecting radiographic image quality; a misrepresentation of the size and shape of the structures being examined Distortion
Projection of an object, making it appear longer than it really is Elongation
Projection of an object, making it appear shorter than it really is Foreshortening
Factors that affect size distortion OID and SID
Factors that affect shape distortion Alignment and Angulation
The only possible size distortion in radiography Magnification
Reduced magnification size distortion, increases what? Spatial Resolution
Magnification size distortion is controlled by positioning the body part and tube to ______ SID while ______ OID. maximize; minimizing
The ____ is the critical distance for magnification and resolution OID
The equation used to figure out the Magnification Factor: M=SID/SOD
Shape distortion involves what two factors? Elongation and Foreshortening
The long axis of the part in order to avoid shape distortion, needs to be _______ to the central ray and ______ to the image receptor. Perpendicular; parallel
Why is shape distortion primarily used? To avoid superimposition of anatomical structures
Popular Radiology sets

 

 



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