Exam 2 Wrong Answers

Which of the following radiopharmaceuticals may be used to image acute deep vein thrombosis in the lower extremities?

a. Tc-99m sulfur colloid
b. Tc-99m macroaggregated albumin
c. I-123 iobenguane
d. In-111 oxyquinoline
e. Tc-99m arcitumomab

b

In performing radionuclide venography with Tc-99m MAA, the radiopharmaceutical is administered at what site?

a. dorsal veins on top of each foot
b. either femoral vein
c. metacarpal vein
d. either basilic vein
e. antecubital area of either arm

a

After total thyroidectomy, total-body imaging with radioiodine normally will demonstrate tracer concentration in which of the following areas?

a. liver, lungs, and bones
b. salivary glands, stomach, and bladder
c. liver, salivary glands, stomach, and lungs
d. bladder, liver, and brain
e. GI tract, bladder, and bones

B

A parathyroid adenoma will concentrate which of the following radiopharmaceuticals?

a. I-123 sodium iodide
b. Tc-99m pertechnetate
c. Tc-99m sestamibi
d. Tc-99m pertechnetate or Tc-99m sestamibi
e. Tc-99m filtered sulfur colloid

c

When positioning a patient for an LAO view of a gated equilibrium ventricular function study, tilting the camera detector toward the patient’s feet separates which two structures?

a. left ventricle and aorta
b. right ventricular and aorta
c. left ventricle and left atrium
d. left and right ventricles
e. left and right atria

c

How long after the administration of Tc-99m pertechnetate does imaging begin for the localization of a Meckel’s diverticulum?

a. 10 min
b. 15-20 min
c. 1 hr
d. immediately
e. delayed imaging 2-3 hr

d

Radionuclide cystography is performed by the direct method using which of the following radiopharmaceuticals?

a. Tc-99m pentetate or Tc-99m medronate
b. Tc-99m pertechnetate or Tc-99m pentetate
c. Tc-99m pertechnetate or Tc-99m mertiatide
d. Tc-99m gluceptate or Tc-99m sulfur colloid
e. Tc-99m pertechnetate or Tc99m sulfur colloid

e

On Wednesday, a patient had a I-123 thyroid study performed; a I-125 plasma volume is ordered to be performed on Thursday. Which of the following statements about the situation is correct?

a. The I-123 will not interfere with the plasma volume determination.
b. The blood volume determination should be postponed until the I-123 is decayed.
c. A baseline plasma sample should be collected before performing the plasma volume.
d. I-131 instead of I-125 human serum albumin should be used for the plasma volume determination.
e. I-123 instead of I-125 human serum albumin should be used for the plasma volume determination.

c

After administration of In-111 pentetreotide, which areas of the body should be imaged?

a. anterior and posterior whole body
b. anterior and posterior abdomen
c. anterior and posterior pelvis
d. anterior, posterior, and laterals of head and neck
e. anterior and posterior chest

a

Which of the following tracers is preferred if a first-pass stress and rest cardiac function examination are to be performed on a patient?

a. Tc-99m pertechnetate
b. Tc-99m medronate
c. Tc-99m micro-aggregated albumin
d. Tc-99m sestamibi
e. Tc-99m pentetate

e

Data derived from a first-pass cardiac examination and a region of interest drawn over the lung are used to generate the pulmonary time-activity curve shown here. The arrow indicates:

a. first pass of activity through the lungs
b. second pass of activity through the lungs
c. third pass of activity through the lungs
d. activity returning prematurely to the lungs
e. activity returning from the systemic circulation

d

A patient’s plasmacrit may be determined by:

a. multiplying the patient’s hematocrit by 0.9
b. adding the decimal hematocrit to 1
c. finding the ratio of plasma volume to the red blood cell volume
d. dividing 1 by the decimal hematocrit
e. subtracting the decimal hematocrit from 1

e

During a red cell sequestration study, counts are obtained from all of the following organs except the:

a. kidneys
b. spleen
c. atria of heart
d. liver
e. ventricles of heart

a

In performing a plasma volume with I-125 albumin, three blood samples are collected at varying times after tracer administration and counted. These counts vs. time are plotted as a semilog graph. The purpose of this graph is to:

a. give a visual representation of the data
b. obtain the half-time clearance value used in the calculations
c. correct for leakage of the radiopharmaceutical
d. show the decay of the radionuclide
e. indicate the correct bioroute

c

Patient preparation for a thyroid uptake test may include discontinuation of anti-thyroid medications. Which of the following is one of these anti-thyroid drugs?

a. synthroid
b. potassium perchlorate
c. propylthiouracil
d. thyroxine
e. Lugol’s solution

c

During a radiochromium red cell mass determination, an infusion set may be used to place a needle in the patient’s antecubital vein. To maintain the patency of the infusion set tubing, what substance should be injected into the infusion set tubing?

a. a chelating agent
b. normal saline
c. ACD solution
d. heparin
e. bacteriostatic water

d

In the case of insulinoma, which of the following radiopharmaceuticals may cause hypoglycemia?

a. In-111 white blood cells
b. Tc-99m sestamibi
c. Ga-67 citrate
d. In-111 pentetreotide
e. F-18 fluorodeoxyglucose

d

On the basis of these data, what is the patient’s thyroid uptake at 1500 if a I-123 sodium iodide capsule administered to the patient is used as the standard?

a. 32%
b. 44%
c. 51%
d. 60%
e. 87%

d

To calculate the yield of a Mo-99 / Tc-99m generator, in what sequence should the following steps be performed?

I. Measure the amount of Tc-99, activity eluted from the generator.
II. Determine the amount of Mo-99 activity present on the generator at the given time t.
III. Calculate the fraction of Tc-99m activity eluted compared with the Tc-99m activity present on the generator column.
IV. Determine how much Tc-99m activity has formed by Mo-99 decay at a given time t.
V. Determine the elapsed time from calibration to time t.

a. I, II, III, IV, V
b. V, II, IV, I, III
c. IV, II, V, III, I
d. I, V, II, IV, III
e. II, V, I, IV, III

b

When performing radiochromatography on a radiopharmaceutical sample, the locations of the radiochemical components on the chromatography strip are as shown here. What is the Rf value of hydrolyzed-reduced Tc-99m if the solvent front is 12.6 cm from the origin?

a. 0.003
b. 0.012
c. 0.20
d. 2.0
e. 4.8

d

All of the following units are expressions of radiopharmaceutical specific activity except:

a. uCi/mg
b. kBq/mL
c. Ci/g
d. MBq/mol
e. mCi/ug

b

According to the NRC regulations, all of the following information must appear in the record of Mo-99 concentration measurements except:

a. dose calibrator make and model
b. date of measurement
c. name of the individual making the measurement
d. ratio of Mo-99 to Tc-99m activities
e. time of measurement

a

If Tc-99m eluate has to be diluted to prepare other Tc-99m labeled products, the correct diluent is which of the following?

a. sterile saline containing 0.2% thiosulfate
b. preservative-free isotonic saline
c. bacteriostatic saline
d. distilled water
e. sterile water

b

A unit dosage of Ga-67 citrate calibrated for 0800 on July 9 contains 5 mCi in 2.6 mL. If 3 mCi are needed on July 10 at 0800, what volume should be retained in the syringe?

a. 2.7 mL
b. 1.9 mL
c. 1.5 mL
d. 1.3 mL
e. 1.1 mL

b

When can a decay factor be used to calibrate a unit dosage in place of measuring the dosage in a dose calibrator?

a. A dose calibrator must be used to measure every dosage.
b. only if the same size and type syringe is used
c. only if a unit dosage was not manipulated after preparation and calibration
d. only if the dosage contains less than 1 mCi activity
e. only if the dosage contains Tc-99m

c

If a patient must be hospitalized in isolation after receiving a high activity of I-131, which of the following signs must be placed on the door of the isolation room?

a. “Authorized Personnel Only”
b. “Caution: Airborne Radioactivity”
c. “Reverse Isolation Procedures Required”
d. Length of time a visitor may stay in the room
e. Sign-in sheet to record name and age of each visitor

d

How soon after a medical event has occurred must the NRC be notified?

a. written report within 24 hours
b. telephone notification within 72 hours
c. telephone notification no later than the following calendar day
d. written report within 30 calendar days
e. written report within 5 regular work days

c

Which of the following is a high-pass filter?

a. Ramp
b. Hanning
c. Parzen
d. Newcomer
e. Butterworth

a

In quantitating scintillation camera detector uniformity, the central field of view (CFOV) is defined as the diameter of the useful field of view (UFOV) times:

a. 0.95
b. 0.75
c. 0.33
d. 0.25
e. 0.15

b

When the heart rate is 95 beats/min, what is the length of an average R-R interval?

a. 0.63 sec
b. 1 sec
c. 1.6 sec
d. 1.9 sec
e. 2.5 sec

a

Coincidence loss is likely to occur when using a well counter if the:

a. energy of the radionuclide is below 50 keV
b. energy of the radionuclide is above 300 keV
c. activity of the source is below 1 uCi
d. activity of the source is above 2 mCi
e. activity of the source is between 1uCi and 1 mCi

d

To assure a maximum error of 2% at the 95% confidence level, all samples that are measured in a well counter should be counted for a time interval that produces at least:

a. 7,500 counts
b. 5,000 counts
c. 1,000 cpm
d. 500 cpm
e. 10,000 counts

e