homework review t3

Question 1

the SI unit for exposure is

Answer 1

coulomb/kilogram

Question 2

Because multiple slices are acquired during CT scans, scatter dose is accounted for using

Answer 2

multiple scan average dose (MSAD)

Question 3

An indicator of radiation output, ______ does not represent the actual amount of radiation absorbed by the patient

Answer 3

CT Dose Index

Question 4

Which of the following is an example of dose modulation technique

CARE Dose
AutomA
SUREExposure
all of the above

Answer 4

all of the above

Question 5

true/false: Patient shielding in CT requires a 360o application

Answer 5

true

Question 6

true/false: Dose justification is a radiation protection principle intended to ensure that doses delivered to patients are kept as low as reasonably achievable (ALARA)

Answer 6

false

Question 7

Each of the following classify as a proper radiation protection action except:
a. justifying physician orders.
b. increase distance.
c. decrease exposure time.
d. increase shielding.

Answer 7

justifying physician orders

Question 8

if the pitch increases, the dose __________

Answer 8

decreases

Question 9

true/false: the DLP is directly proportional to the scan length

Answer 9

true

Question 10

What technical factor determines the penetrating power of the photons coming from the X-ray tube?

Answer 10

kVp

Question 11

the NRCP whole-body effective dose limit for occupational exposure in radiation workers is

Answer 11

50 mSv

Question 12

according to NRCP recommendations, secondary radiation barriers should contain _______ thickness of lead or the equivalent.

Answer 12

0.1-0.4 mm

Question 13

The speed with which the exam table progresses through the scanner is controlled by the _________

Answer 13

pitch

Question 14

All of the following are true of the display field of view, EXCEPT that it:

a. is the reconstructed area seen on the image monitor
b. can be adjusted to render the area of anatomy needed
c. cannot be expanded beyond the scan area
d. affects patient dose

Answer 14

d. affects patient dose

Question 15

Which of the following is considered a moderate or severe reaction to IV contrast?

feeling flushed
hives
nausea
vomiting

Answer 15

hives

Question 16

Methylprednisolone, or Solu-Medrol, is commonly included in crash carts to

Answer 16

reduce inflammation

Question 17

One study suggests that bolus tracking can reduce patient dose by up to _____ without any loss of diagnostic quality.

Answer 17

70%

Question 18

t/f: Higher slice scans equate to higher patient dose.

Answer 18

true

Question 19

t/f: Non-ionic contrast is more likely to cause serious reactions in patients than ionic contrast media.

Answer 19

false, they are less likely

Question 20

t/f: CT scans should never be performed on pregnant patients.

Answer 20

false

Question 21

All of the following are required components of informed consent EXCEPT:

a. dated signatures from the patient, provider, and witness
b. a thorough patient history
c. an explanation of procedural risks
d. effective communication between the provider and patient

Answer 21

b. a thorough patient history

Question 22

What lab test is performed to help diagnose the presence of a blood clot?

Answer 22

D-dimer

Question 23

All of the following are true of low osmolar contrast media EXCEPT:

a. it does not dissociate in solution
b. it has an osmolality 2 to 3 times higher than blood
c. it is generally less expensive than ionic contrast media
d. it has a relatively lower risk of adverse patient reactions

Answer 23

c. it is generally less expensive than ionic contrast media

Question 24

Which of the following is an indication for IV contrast?

acute stroke
renal stones
hemorrhage
appendicitis

Answer 24

appendicitis

Question 25

Which of the following is considered a mild reaction to contrast media? nasal congestion hoarseness hypertensive urgency itching

Answer 25

nasal congestion

Question 26

t/f: Contrast administration flow rates of 5 mL/s or higher require a large bore angiocatheter and mechanical power injector to be achieved.

Answer 26

true

Question 27

t/f: The equilibrium phase of tissue enhancement is better known as the venous phase.

Answer 27

false, this is the nonequilibrium phase

Question 28

What is the key risk factor for a patient developing contrast-induced nephropathy from IV contrast administration?

Answer 28

Prior history of acute kidney injury

Question 29

What reaction to IV administered iodinated contrast media is classified as severe? a. Vomiting b. Dizziness c. Itching d. Convulsions

Answer 29

d. Convulsions

Question 30

Which is not a type of negative contrast media? a. Water b. Gas c. Air d. Barium

Answer 30

d. Barium