Chapter 9 Quiz

Question 1

The fasting state is usually associated with _______.

-low glucose and low insulin levels
-low glucose and high insulin levels
-high glucose and low insulin levels
-high glucose and high insulin levels

Answer 1

low glucose and low insulin levels

Question 2

The scan of a patient with ______ may be suboptimal because F-18 FDG competes with glucose for cellular uptake.

hyperglycemia
hypoglycemia
hyperthyroidism
hypothyroidism

Answer 2

hyperglycemia

Question 3

Which of the following mechanisms may increase the tumor-to-background ration during PET acquisition?

-patient fast for 2-4 hours before F-18 FDG injection
-patient fast for 4-6 hours before F-18 FDG injection
-administration of D5W solution for all patients
-administration of TPN

Answer 3

patient fast for 4-6 hours before F-18 FDG injection

Question 4

Unlike normal glucose, the primary route for excretion of F-18 FDG is through the _________.

bowel
genitourinary system
lymphatic system
saliva

Answer 4

genitourinary system

Question 5

__________ reduces serum insulin to a near-basal level.

exercising
fasting
hydrating
voiding

Answer 5

fasting

Question 6

Female patients who are breast feeding should be instructed to discontinue breastfeeding for ____ hours after F-18 FDG injection.

6-12
12-18
18-24
none of the above

Answer 6

18-24

Question 7

Which of the following factors affect the accuracy of SUV?

uptake time
residual dose
blood glucose level
all of the above

Answer 7

all of the above

Question 8

What is the major transporter that is used in the uptake of glucose in muscle?

GLUT1
GLUT2
GLUT3
GLUT4

Answer 8

GLUT4

Question 9

Actively used skeletal muscle utilizes glucose, therefore _________.

-patients should avoid exercise for 24hrs before the PET scan
-patients should avidly exercise 24hrs before the PET scan
-patients should not worry about it because a PET scan has nothing to do with the muscles
-none of the above

Answer 9

patients should avoid exercise for 24hrs before the PET scan

Question 10

F-18 FDG is very sensitive, yet not specific, which means that ________.

-itis only taken up in cancer celss
-it may be taken up in other processes, such as infection
-it is not a good tracer
-none of the above

Answer 10

it may be taken up in other processes, such as infection

Question 11

Why does F-18 FDG become “metabolically trapped” in the cell?

-it is a substrate for further phosphorylation
-it undergoes further phosphorylation and metabolism via the glycolytic pathway
-it is not a substrate for further phosphorylation
-none of the above

Answer 11

it undergoes further phosphorylation and metabolism via the glycolytic pathway

Question 12

What is the purpose of respiratory gating?
-improving registration between CT and PET data
-providing a motion capture data set
-monitoring patient respiratory cycles
-none of the above

Answer 12

improving registration between CT and PET data