Deck 37: Patient Radiation Dose Management

Question 1

The frequency of x-ray examinations being performed is increasing in all age groups.

Answer 1

True

Question 2

If the radiographic technique for a KUB calls for 40 mAs,what is the ESE when the output intensity is 0.075 mGy/mAs?

A) 0.40 mGy
B) 0.475 mGy
C) 3 mGy
D) 30 mGy

Answer 2

3 mGy

Question 3

If the output intensity of an x-ray machine is 0.064 mGy/mAs at 80 kVp,what is the patient's ESE for an exam done at 20 mAs at 80 kVp?

A) 1.6 mGy
B) 1.28 mGy
C) 0.64 mGy
D) 0.064 mGy

Answer 3

1.28 mGy

Question 4

Patient dose from diagnostic x-rays is most often reported in _____.

A) bone marrow dose
B) gonadal dose
C) entrance skin exposure
D) none of the above

Question 5

The period of major organogenesis is during the _____ of pregnancy.

A) first 2 weeks
B) second to tenth week
C) 2nd trimester
D) 3rd trimester

Question 6

CT is considered a low-dose procedure.

A) True
B) False

Question 7

The approximate average bone marrow dose to the population of the United States is _____ mGy/yr.

A) 0.01
B) 0.1
C) 1
D) 10

Question 8

Patient skin exposure can be measured indirectly by using a _____.

A) thermoluminescent dosimeter
B) nomogram
C) G-M counter
D) stop watch

Question 9

The simplest way to measure patient dose is to measure the _____.

A) bone marrow dose
B) gonadal dose
C) entrance skin exposure
D) genetically significant dose

Question 10

Patient dose is usually estimated by conducting simulated x-ray examinations with _____.

A) human subjects.
B) laboratory animals.
C) human phantoms and test objects.
D) all of the above

Question 11

The genetically significant dose for the general public is important because of the risk of _____.

A) increasing skin cancer
B) effects on the gene pool
C) damage to the fetus
D) all of the above

Question 12

What are the only acceptable techniques for mammography?
I. screen/film
II. digital
III. xerography

A) I only
B) II only
C) I & II
D) I, II, & III

Question 13

Acute skin effects from radiation exposure have been reported following _____ exams.

A) lumbar spine
B) GI fluoro
C) mammography
D) angiointerventional

Question 14

Glandular dose from mammography is approximately _____ of the ESE.

A) 5%
B) 15%
C) 100%
D) 200%

Question 15

An estimation of patient dose is reported as _____.

A) entrance skin exposure
B) bone marrow dose
C) gonadal dose
D) any of the above

Question 16

Bone marrow dose is measured _____.

A) directly from bone marrow
B) as an estimate from ESE
C) as an estimate from gonadal dose
D) directly from the beam

Question 17

For the average fluoroscopy exam the ESE is

A) 40 mGy/min
B) 80 mGy/min
C) 400 mGy/hr
D) 250 mGy/hr

Question 18

The most important variables in determining x-ray dose are the _____ and the _____.
I. receptor speed
II. patient thickness
III. x-ray production efficiency
IV. technique used

A) I & III
B) I & II
C) II & IV
D) I & IV

Question 19

The radiation dose monitor most frequently used to measure patient exposure is the _____.

A) film badge
B) G-M meter
C) nomogram
D) thermoluminescent dosimeter

Question 20

Digital mammography results in lower doses than screen/film mammography.

Question 21

Which exam does not have one of the highest repeat rates?

A) lumbar spine
B) KUB
C) chest x-ray
D) thoracic spine

Question 22

Patient dose can be reduced by using _____.
I. faster screens
II. higher kVp
III. increased distance

A) I only
B) II only
C) I & II
D) I, II, & III

Question 23

Performing routine x-ray exams without indication is acceptable for _____.

A) preemployment physicals
B) all hospital admissions
C) annual routine physicals
D) none of the above

Question 24

Breast dose from a scoliosis exam can be reduced by using the _____.
I. AP projection
II. PA projection
III. lead shielding

A) I
B) II
C) I & III
D) II & III

Question 25

The dose in CT is lower if the multislice number is higher.