Chapter 14 Image Acquisition Bushong: Radiologic Science for Technologists
MULTIPLE CHOICE
1. What are the prime exposure factors?
a. kVp, mAs, filtration, and voltage ripple
b. mA, time, distance, and filtration
c. kVp, mAs, and SID
d. mA, time, kVp controls, and focal spot size
ANS: C
The primary exposure factors are kVp, mAs, time, and SID.
2. Changes in kVp affect all of the following, except .
a. number of electrons boiled off the filament
b. image receptor exposure
c. beam penetrability
d. x-ray beam energy
ANS: A
Changes in kVp do not affect the number of electrons boiled off the filament
3. An increase in mAs causes in beam quality and in beam intensity.
a. an increase; a decrease
b. an increase; no change
c. an increase; an increase
, d. no change; an increase
ANS: D
An increase in mAs causes no change in beam quality and an increase in beam quantity.
4. There is a direct relationship between the quantity of x-rays and the
. a. milliamperage
b. kilovolt peak
c. filter thickness
d. voltage ripple
ANS: A
There is a direct relationship between the quantity of x-rays and the milliamperage.
5. If mAs is increased from 20 mAs to 40 mAs, the patient dose will . a.
not be affected
b. increase slightly
c. be halved
d. be doubled
ANS: D
If mAs is increased from 20 mAs to 40 mAs the patient dose will be doubled.
6. Beam penetrability is increased if is/are increased.
a. mAs
, b. SID
c. kVp
d. OID
ANS: C
Beam penetrability is increased if kVp is increased.
7. A % increase in kVp may be accompanied by a % reduction in mAs to
produce the same image receptor response at a slightly reduced contrast scale. a. 5; 30
b. 15; 20
c. 15; 15
d. 5; 15
ANS: A
An increase of 5% in kVp may be accompanied by a 30% reduction in mAs to produce
the same image receptor response at a slightly reduced contrast scale = the 5% rule.
8. At least a % change in mAs is necessary to produce a visible change in the image.
a. 10
b. 15
c. 30
d. 50
ANS: C
At least a 30% change in mAs is necessary to produce a visible change in the image.
MULTIPLE CHOICE
1. What are the prime exposure factors?
a. kVp, mAs, filtration, and voltage ripple
b. mA, time, distance, and filtration
c. kVp, mAs, and SID
d. mA, time, kVp controls, and focal spot size
ANS: C
The primary exposure factors are kVp, mAs, time, and SID.
2. Changes in kVp affect all of the following, except .
a. number of electrons boiled off the filament
b. image receptor exposure
c. beam penetrability
d. x-ray beam energy
ANS: A
Changes in kVp do not affect the number of electrons boiled off the filament
3. An increase in mAs causes in beam quality and in beam intensity.
a. an increase; a decrease
b. an increase; no change
c. an increase; an increase
, d. no change; an increase
ANS: D
An increase in mAs causes no change in beam quality and an increase in beam quantity.
4. There is a direct relationship between the quantity of x-rays and the
. a. milliamperage
b. kilovolt peak
c. filter thickness
d. voltage ripple
ANS: A
There is a direct relationship between the quantity of x-rays and the milliamperage.
5. If mAs is increased from 20 mAs to 40 mAs, the patient dose will . a.
not be affected
b. increase slightly
c. be halved
d. be doubled
ANS: D
If mAs is increased from 20 mAs to 40 mAs the patient dose will be doubled.
6. Beam penetrability is increased if is/are increased.
a. mAs
, b. SID
c. kVp
d. OID
ANS: C
Beam penetrability is increased if kVp is increased.
7. A % increase in kVp may be accompanied by a % reduction in mAs to
produce the same image receptor response at a slightly reduced contrast scale. a. 5; 30
b. 15; 20
c. 15; 15
d. 5; 15
ANS: A
An increase of 5% in kVp may be accompanied by a 30% reduction in mAs to produce
the same image receptor response at a slightly reduced contrast scale = the 5% rule.
8. At least a % change in mAs is necessary to produce a visible change in the image.
a. 10
b. 15
c. 30
d. 50
ANS: C
At least a 30% change in mAs is necessary to produce a visible change in the image.
