CBET Diagnostic Imaging Equipment 3

Question 1

What does the term 'spatial resolution' describe in diagnostic imaging?

Accepted Answer

The ability to distinguish two closely spaced objects as separate

Answer

The range of detectable tissue densities

Answer

The speed of image acquisition

Answer

The size of the patient bore

Question 2

A fluoroscopy unit's automatic exposure control (AEC) is not functioning. What is the main risk?

Accepted Answer

Patient may receive excessive radiation dose

Answer

Images will be black

Answer

The table will not move

Answer

The PACS connection will drop

Question 3

What does 'acoustic coupling gel' accomplish in ultrasound imaging?

Accepted Answer

It eliminates air gaps between the transducer and skin to prevent signal reflection loss

Answer

It sterilizes the transducer

Answer

It increases X-ray penetration

Answer

It reduces MRI artifact

Question 4

Which test verifies that an MRI RF transmitter is delivering accurate flip angles?

Accepted Answer

RF power calibration / transmitter gain verification

Answer

Gradient linearity test

Answer

Magnetic field homogeneity shimming

Answer

Cryogen level check

Question 5

In a nuclear medicine gamma camera, what crystal converts gamma photons to light?

Accepted Answer

Sodium iodide (NaI) scintillator crystal

Answer

Cesium iodide (CsI) crystal

Answer

Silicon carbide crystal

Answer

Bismuth germanate (BGO) crystal

Question 6

What is the ALARA principle as applied to diagnostic imaging in US healthcare?

Accepted Answer

Keep radiation exposure As Low As Reasonably Achievable while maintaining diagnostic quality

Answer

Always use the largest aperture for imaging

Answer

Avoid low-dose techniques in pediatric patients

Answer

Apply maximum exposure settings for clarity