CAMRT Computed Tomography and Advanced Imaging Questions and Answers 2

Question 1

In MRI, the term 'T1-weighted image' refers to a sequence that highlights contrast based on:

Accepted Answer

Spin-lattice (longitudinal) relaxation time differences between tissues

Answer

T1 weighting uses the longitudinal (spin-lattice) relaxation time (T1) to differentiate tissues; fat appears bright and fluid appears dark on T1 images.

Question 2

Which contrast agent is most commonly used for MRI enhancement?

Accepted Answer

Gadolinium-based contrast agent (GBCA)

Answer

Gadolinium-based contrast agents (GBCAs) shorten T1 relaxation time, causing enhanced tissues to appear brighter on T1-weighted MRI sequences.

Question 3

A patient with a pacemaker presents for an MRI examination. What is the most appropriate action?

Accepted Answer

Consult the ordering physician and check if the pacemaker is MR-conditional before proceeding

Answer

MR technologists must verify the pacemaker model, determine if it is MR-conditional, and consult the ordering physician and MRI physicist before proceeding.

Question 4

In nuclear medicine, which radionuclide is most commonly used for bone scans?

Accepted Answer

Technetium-99m (Tc-99m)

Answer

Tc-99m labeled phosphonates (e.g., MDP) are the standard radiopharmaceuticals for bone scintigraphy due to their favorable physical properties and affinity for bone.

Question 5

What does the term 'slice thickness' affect in CT image quality?

Accepted Answer

Z-axis resolution and partial volume averaging

Answer

Thinner slices improve z-axis (longitudinal) spatial resolution and reduce partial volume averaging, but increase image noise.

CAMRT - Canadian Association of Medical Radiation Technologists Practice Test

CAMRT - Canadian Association of Medical Radiation Technologists Practice Test

CAMRT Computed Tomography and Advanced Imaging Questions and Answers 2