Question 1

The dose equivalent limit per year for the hands of a nuclear medicine technologist is&#10;A)0.5 rem (5 mSv).&#10;B)5 rem (50 mSv).&#10;C)30 rem (300 mSv).&#10;D)50 rem (500 mSv).

Accepted Answer

The NRC dose equivalent limits per year for hands, forearms, feet, and ankles is 50 rem (500 mSv).

Question 2

Spatial resolution of the gamma camera should be evaluated at least&#10;A)daily.&#10;B)weekly.&#10;C)quarterly.&#10;D)semi-annually.

Accepted Answer

The spatial resolution quality control procedure is required to be performed a minimum of once a week on every imaging system.

Question 3

The discrimination and selection of the gamma photon detected by a scintillation camera are carried out by the&#10;A)detection crystal.&#10;B)photomultiplier tube.&#10;C)pulse height analyzer.&#10;D)collimator.

Accepted Answer

The discrimination and selection of the gamma photon are performed with a pulse height analyzer (PHA).

Question 4

The ability to produce a linear image with straight lines corresponding to the same straight lines of a bar pattern is known as&#10;A)photopeaking.&#10;B)field uniformity.&#10;C)spatial resolution.&#10;D)spatial linearity.

Accepted Answer

Spatial linearity refers to the ability of the scanner to produce linear images with straight lines corresponding to the same straight lines of a bar pattern. It is a measure of how accurately the scanner reproduces the positions of the object being scanned.

Question 5

Photopeak evaluation of the gamma camera should be performed at least&#10;A)daily.&#10;B)weekly.&#10;C)quarterly.&#10;D)semi-annually.

Accepted Answer

Photopeak evaluation is a critical quality control measure in nuclear medicine imaging as it ensures that the gamma camera is accurately detecting the energy peak of the radionuclide being imaged. Daily evaluation is recommended in order to detect any changes or malfunctions in the camera that may affect image quality.

Question 6

The NRC requires that all survey meters undergo a ____ calibration and daily reference check before use.&#10;A)daily&#10;B)weekly&#10;C)monthly&#10;D)yearly

Accepted Answer

The NRC requires that all survey meters undergo an annual calibration and a daily reference check before use.

Question 7

Uniformity correction evaluation for SPECT gamma cameras should be performed at least&#10;A)daily.&#10;B)weekly.&#10;C)monthly.&#10;D)quarterly.

Accepted Answer

The uniformity correction flood procedure should be performed weekly.

Question 8

The gamma detector's ability to detect ionizing events is known as&#10;A)photopeaking.&#10;B)sensitivity.&#10;C)spatial resolution.&#10;D)spatial linearity.

Accepted Answer

The ability of a gamma detector to detect ionizing events is defined as its sensitivity. Photopeaking refers to the graphical representation of the gamma spectrum, while spatial resolution and spatial linearity refer to the detector's ability to resolve spatial information. Therefore, the correct answer is B.

Question 9

The nuclear medicine procedure that requires photons created during annihilation reactions is&#10;A)SPECT.&#10;B)gamma cameras.&#10;C)PET scanning.&#10;D)all of the above.

Accepted Answer

PET scanning is the only nuclear medicine procedure that uses photons created during the annihilation of positron-emitting radionuclides within the body to produce images. SPECT and gamma cameras, on the other hand, rely on gamma rays emitted directly by radionuclides to create images.

Question 10

The main radiation detector in a scintillation gamma camera is a(n)&#10;A)ion chamber.&#10;B)lithium fluoride crystal.&#10;C)sodium iodide crystal.&#10;D)solid-state detector.

Accepted Answer

The main radiation detector in a scintillation gamma camera is a sodium iodide crystal, which contains a small amount of thallium to enhance its scintillation properties. When gamma rays are absorbed by the sodium iodide crystal, scintillation light is emitted and detected by photomultiplier tubes, which convert the light into electrical signals that can be used to create an image. The other choices, ion chamber, lithium fluoride crystal, and solid-state detector, are also used in radiation detection, but they are not the main detector in a scintillation gamma camera.

Deck 15: Quality Assurance in Nuclear Medicine