Saudi Nuclear Medicine Club Quiz #5 @saudi_nmc

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Quizzes Created: 5 | Total Attempts: 809

Questions: 10 | Attempts: 129 | Updated: Mar 20, 2023

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Saudi Nuclear Medicine Club " Quiz #5 " @saudi_nmc - Quiz

" Quiz #5 " @saudi_nmc
Time: 10mins
10 Questions
[10 multiple-choice]
Number of Attempts Allowed: 3
Good Luck :)

Questions and Answers

1.

Which of the following isotopes would be effectively shielded by a plastic syringe?
- A.
  
  67Ga
- B.
  
  89Sr
- C.
  
  99mTc
- D.
  
  81mKr
- E.
  
  133Xe
Correct Answer
B. 89Sr

Explanation
Beta emitters can be effectively shielded by a few millimeters of plastic or lucite. If shielded with lead, bremsstrahlung radiation will be produced from the slowing beta particles

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2.

Tools for measuring personal exposure to radiation include all of the following except:
- A.
  
  Thermoluminescent dosimeter
- B.
  
  Pocket ionization chamber
- C.
  
  Film badge
- D.
  
  Geiger-Mueller Counter
Correct Answer
D. Geiger-Mueller Counter

Explanation
Personnel exposure is measured by all of the choices except the Geiger-Mueller counter which is a gas fi lled ionization chamber. Because of dead time, it is typically used to measure small amounts of radiation.

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3.

A patient is only able to tolerate 3 images during a 201Tl chloride myocardial perfusion study. From those views listed, which would be the best choice of images to obtain?
- A.
  
  RAO 10°, LAO 45°, and left lateral
- B.
  
  Anterior, LAO 25° and LAO 60°
- C.
  
  Anterior, LAO 45° and LAO 70°
- D.
  
  Anterior, LAO 70° and left lateral
Correct Answer
C. Anterior, LAO 45° and LAO 70°

Explanation
In general, the 45° LAO should allow visualization of the septum and the inferoapical and posterolateral sections of the left ventricular wall. The anterior would then show the inferior, apical and the anterolateral wall sections and the 70° LAO would allow evaluation of the anterior, apical, inferior and posterolateral all sections. If there is not the septum is not well resolved on the 45° LAO due to the patient’s anatomy, another angle could be chosen, and the remaining two angles calculated by subtracting 45° for the “anterior” and by adding 25° for the steep lateral oblique.

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4.

If no gallbladder is seen at one hour following injection of 99mTc DISIDA, what should be done?
- A.
  
  Cimetidine should be given
- B.
  
  Images should be taken at 24 hours
- C.
  
  Images should be taken at 4 hours
- D.
  
  The exam should be ended
Correct Answer
C. Images should be taken at 4 hours

Explanation
Patients should fast 2–4 hours before hepatobiliary imaging. The gallbladder may not be visualized in patients who have recently eaten and in patients who have fasted for extended periods. The use of morphine can hasten visualization of the gallbladder by increasing bile fl ow to the gallbladder relative to the intestine. For patients in an extended fast, sincalide may be used (see explanation to question 5). If there is no gallbladder seen one hour following injection of radiopharmaceutical, delayed images should be obtained.

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5.

If 15 minutes after injection of 8 mCi of 99mTc disofenin, the liver is not visualized, but the heart and kidneys are, what is the most likely reason?
- A.
  
  Too little DISIDA was injected
- B.
  
  The liver is not functioning properly
- C.
  
  The gallbladder is obstructed
- D.
  
  The patient is taking morphine
- E.
  
  The patient has a very low bilirubin level
Correct Answer
B. The liver is not functioning properly

Explanation
Iminodiacetic acids (IDAs) are cleared from the blood by the hepatocytes before they are secreted into the canaliculi. If the liver is not seen but there is cardiac and renal activity at 15 minutes after injection, this likely indicates that there is a problem of liver function.

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6.

Which of the following will not affect thyroid uptake?
- A.
  
  iodinated contrast media
- B.
  
  Propylthiouracil
- C.
  
  Thyroid hormones
- D.
  
  Beta blockers
Correct Answer
D. Beta blockers

Explanation
Beta blockers will not affect thyroid uptake because they do not directly interfere with the thyroid's ability to take up iodine. Beta blockers primarily work by blocking the effects of adrenaline and reducing the heart rate, but they do not have a direct impact on thyroid function. On the other hand, iodinated contrast media, propylthiouracil, and thyroid hormones can all affect thyroid uptake in different ways.

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7.

The salivary glands may be imaged using:
- A.
  
  3 mCi of 201Tl
- B.
  
  5 mCi of 99mTc sestamibi
- C.
  
  5 mCi of 99mTc pertechnetate
- D.
  
  200 uCi of 123I sodium iodide
Correct Answer
C. 5 mCi of 99mTc pertechnetate

Explanation
Pertechnetate is used for imaging the salivary glands, often to evaluate function or rule out masses.

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8.

On a normal renal scan, gallbladder activity is noted. This indicates that the scan was performed using:
- A.
  
  99mTc DMSA
- B.
  
  99mTc DTPA
- C.
  
  99mTc GH
- D.
  
  99mTc MAG3
Correct Answer
D. 99mTc MAG3

Explanation
A small percentage of 99mTc MAG3 may be taken up in the liver and gall bladder in normal patients, and this may be more pronounced in patients with poor renal function.

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9.

If an assay of a vial containing 131I shows 50 mCi present on May 2, approximately what will the assay show on May 18?
- A.
  
  25 mCi
- B.
  
  12.5 mCi
- C.
  
  40 mCi
- D.
  
  6 mCi
Correct Answer
B. 12.5 mCi

Explanation
The half-life of 131I is 8.06 days. Since the time elapsed is about 2 half-lives, the original activity would be halved twice. (50 mCi/2 = 25 mCi, 25 mCi/2 = 12.5 mCi)

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10.

What is the annual dose limit for occupational exposure?
- A.
  
  20 mSv
- B.
  
  2 mSv
- C.
  
  20 mrem
- D.
  
  2 mrem
Correct Answer
A. 20 mSv

Explanation
The annual dose limit for occupational exposure is 20 mSv. This means that individuals who are exposed to radiation in their workplace should not receive more than 20 millisieverts of radiation in a year. This limit is set to protect workers from the harmful effects of radiation and to ensure their safety and well-being.

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Current Version
Mar 20, 2023

Quiz Edited by
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May 19, 2020

Quiz Created by
Zeem

Saudi Nuclear Medicine Club " Quiz #5 " @saudi_nmc

Which of the following isotopes would be effectively shielded by a plastic syringe?

Tools for measuring personal exposure to radiation include all of the following except:

A patient is only able to tolerate 3 images during a 201Tl chloride myocardial perfusion study. From those views listed, which would be the best choice of images to obtain?

If no gallbladder is seen at one hour following injection of 99mTc DISIDA, what should be done?

If 15 minutes after injection of 8 mCi of 99mTc disofenin, the liver is not visualized, but the heart and kidneys are, what is the most likely reason?

Which of the following will not affect thyroid uptake?

The salivary glands may be imaged using:

On a normal renal scan, gallbladder activity is noted. This indicates that the scan was performed using:

If an assay of a vial containing 131I shows 50 mCi present on May 2, approximately what will the assay show on May 18?

What is the annual dose limit for occupational exposure?