Deck 29: Distortion

Question 1

Which of the following occurs when the tube or the image receptor is not properly aligned?

A)elongation
B)magnification
C)foreshortening
D)minification

Answer 1

elongation

Question 2

Size distortion in radiography can be ____ only.

A)foreshortening
B)magnification
C)elongation
D)minimization

Answer 2

magnification

Question 3

Which one of the following occurs when the part is improperly aligned?

A)elongation
B)magnification
C)foreshortening
D)minification

Answer 3

foreshortening

Question 4

Proper alignment is achieved when the central ray is ____ to the part and ____ to the image receptor.

A)perpendicular; parallel
B)parallel; perpendicular
C)perpendicular; perpendicular
D)parallel; parallel

Question 5

Which examination does not exhibit an inherently large OID?

A)AP lumbar spine
B)lateral cervical spine
C)lateral chest
D)AP facial bones

Question 6

Size distortion is controlled by

A)SID.
B)OID.
C)radiographic distances.
D)all of the above

Question 7

In order to achieve a true SID of 40" with an x-ray tube angle of 30 degrees, the overhead scale should read

A)23 inches.
B)95 cm.
C)34.6 inches.
D)both b and c

Question 8

Distortion is a misrepresentation of

A)size only.
B)shape only.
C)size and shape.
D)detail.

Question 9

Opening up the intervertebral joints of the cervical spine would best be accomplished with

A)the patient in a PA projection at 72" SID.
B)the patient in an AP projection with a 40" SID.
C)a perpendicular central ray at 72" SID.
D)the patient in a PA projection with a 40" SID.

Question 10

The ____ the SID, the ____ the magnification.

A)greater; larger
B)greater; smaller
C)lesser; smaller
D)SID has no effect on magnification.

Question 11

The magnification factor for a radiographic procedure is calculated at 1.25.It may be assumed that there is a ____ magnification of the object size.

A)25%
B)125%
C)0.25%
D)1.25%

Question 12

Because the x-ray beam is divergent,

A)minification is impossible.
B)minification is a function of tube angle.
C)minification is greater with a smaller target angle.
D)minification is greater with a larger target angle.

Question 13

X-ray tube angulations inherently

A)require radiographic grids.
B)change the SID.
C)introduce magnification to some degree.
D)both b and c

Question 14

Performing a routine chest radiograph in the anterior-posterior (AP) projection will

A)decrease heart size on the image.
B)demonstrate higher resolution of the anterior ribs.
C)produce improved resolution of the thoracic spine.
D)decrease breast exposure.

Question 15

Examinations of body parts with a large inherent OID warrant a ____ whenever possible.

A)small SID
B)large SID
C)small SOD
D)large focal spot

Question 16

When the position of the patient is reversed, the direction of the tube angle must be ____ to maintain the relationship.

A)maintained
B)decreased
C)increased
D)reversed

Question 17

As size distortion decreases, the resolution of recorded detail

A)increases.
B)decreases.
C)is not affected.
D)is lost.

Question 18

A renal calculus that measures 0.2 mm in size

A)cannot be visualized with an effective focal spot of 0.5 mm focal spot due to penumbral overlap.
B)is best seen with magnification and a large focal spot.
C)most likely will be visualized with a small radiographic tube angle using a large target angle.
D)all of the above

Question 19

As OID increases and SID remains constant, entrance skin exposure (ESE)

A)remains unchanged.
B)decreases.
C)increases.
D)none of the above

Question 20

Large patients receive a greater exposure than small patients because their

A)SOD is decreased.
B)OID is increased.
C)entrance skin surface is closer to the source.
D)all of the above

Question 21

Match the following choices with the appropriate statement.
an image in which the object is actually shorter

A)kidneys
B)SID SOD
C)elongation
D)SOD
E)object size
F)scapula
G)foreshortening
H)patella

Question 22

Match the following choices with the appropriate statement.
ratio between image size and MF

A)kidneys
B)SID SOD
C)elongation
D)SOD
E)object size
F)scapula
G)foreshortening
H)patella

Question 23

If a projected image measures 3 in.and the magnification factor is 1.1, what is the size of the actual object?

Question 24

If an object is measured as 4 in.in diameter on the image and 4 in.from the film, what is the actual size of the object if the SID is 40 in.?

Question 25

If an object measures 2 cm and the image measures 4 cm, what is the percent magnification of the object?

Question 26

Match the following choices with the appropriate statement.
SID MF

A)kidneys
B)SID SOD
C)elongation
D)SOD
E)object size
F)scapula
G)foreshortening
H)patella

Question 27

Calculate the magnification factor when the SID is 72 in.and the SOD is 25 in.

Question 28

If an object measures 2 cm and the image measures 3 cm, what would be the percent magnification of the object?

Question 29

Match the following choices with the appropriate statement.
inherently magnified in AP projection

A)kidneys
B)SID SOD
C)elongation
D)SOD
E)object size
F)scapula
G)foreshortening
H)patella

Question 30

Match the following choices with the appropriate statement.
best seen with the patient supine

A)kidneys
B)SID SOD
C)elongation
D)SOD
E)object size
F)scapula
G)foreshortening
H)patella

Question 31

Calculate the magnification factor when the SID is 40 in.and the SOD is 25 in.

Question 32

Match the following choices with the appropriate statement.
MF

A)kidneys
B)SID SOD
C)elongation
D)SOD
E)object size
F)scapula
G)foreshortening
H)patella

Question 33

Calculate the magnification factor when the SID is 40 in.and the OID is 5 in.

Question 34

If an object is measured as 4 in.in diameter on the image and 2 in.from the film, what is the actual size of the object if the SID is 40 in.?

Question 35

Calculate the magnification factor when the SID is 72 in.and the OID is 2 in.