CH 29 Distortion

Question 1

A general rule in radiography is to:

Answer 1

Maximize SID and reduce OID.

Question 2

A decrease in SID does what to Mag, Distortion and Detail?

Answer 2

Increases magnification, increases distortion and decreases detail.

Question 3

AN increase in OID does what to Mag, Distortion and detail?

Answer 3

Increases magnification, increases distortion and decreases detail.

Question 4

Foreshortening is the

Answer 4

Insufficient CR angle or angle of the part.

Question 5

Elongation is

Answer 5

Excessive CR angle

Question 6

For every 5 degrees of CR angle we

Answer 6

reduce our SID on the track by 1 inch.

Question 7

The least amount of distortion occurs at the

Answer 7

Central Ray.

Question 8

The most distortion is found at the

Answer 8

Edges.

Question 9

The tube must always be entered to what?

Answer 9

the part.

Question 10

The Part must always be centered to the?

Answer 10

IR

Question 11

The long axis of the part or object should be

Answer 11

perpendicular to the CR

Question 12

The part should be parallel to

Answer 12

the IR

Question 13

Incorrect centering is caused by:

Answer 13

1)Tube off centering 2)Incorrect part positioning 3)IR off centering