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

Spin-spin relaxation time differences between tissues

Answer

Proton density only

Answer

Diffusion of water molecules

Question 2

Which contrast agent is most commonly used for MRI enhancement?

Accepted Answer

Gadolinium-based contrast agent (GBCA)

Answer

Iodinated contrast (e.g., iohexol)

Answer

Barium sulfate

Answer

Ferromagnetic iron particles only

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

Proceed with MRI using a lower field strength scanner

Answer

Perform the MRI immediately as modern pacemakers are always safe

Answer

Refuse the exam without any consultation

Question 4

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

Accepted Answer

Technetium-99m (Tc-99m)

Answer

Iodine-131 (I-131)

Answer

Thallium-201 (Tl-201)

Answer

Gallium-67 (Ga-67)

Question 5

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

Accepted Answer

Z-axis resolution and partial volume averaging

Answer

Only image noise

Answer

Only contrast resolution

Answer

Scan time only

Question 6

Which fluoroscopic technique reduces patient dose by pulsing the x-ray beam rather than continuous fluoroscopy?

Accepted Answer

Pulsed progressive fluoroscopy

Answer

High-dose-rate fluoroscopy

Answer

Last-image-hold (LIH) only

Answer

Digital subtraction angiography