MRI Q_4: Some questions have a single correct solution (marked multiple choice),

Question

MRI Q_4: Some questions have a single correct solution (marked multiple choice), and some have several correct solutions (marked multiple answer).

1.Multiple Choice: Increasing the magnetic field in MRI ....

A)Reduces the risk of tissue heating.

B)Produces less susceptibility artifacts.

C)Increases the signal to noise.

D)Reduces the danger from metallic projectiles.

2.Multiple Choice: What is a major health concern with MRI?

A)Localized burns due to metallic implants

B)Radiation dose

C)Radiation dose

D)Radiation dose

3.Multiple Choice: Select one of the following objects that you think would always be safe in the MRI suite

A)A wheelchair

B)Scissors

C)A stretcher

D)None of the above

4.Multiple Choice: T1 increases with magnetic field.

A)True

B)False

5)Multiple Choice: Comparing MRI to CT, which is true?

A)Both methods use X-rays, but exposure is higher with CT

B)CT reveals soft structures, while MRI is better at dense material, such as bone

C)Both methods produce cross-sectional images at a specified plane through the body

D)MRI scans take less time

6.Multiple Choice: T1 relaxation is shorter than T2 relaxation.

A)True

B)False

7.Multiple Answer: In comparison to other isotopes, hydrogen-1 is most useful for MRI because of its:

A)High isotopic abundance

B)High tissue concentration

C)High NMR sensitivity

D)High spin density

8.Multiple Answer: During the magnetic resonance relaxation process after a 90° pulse:

A)Longitudinal magnetization increases

B)Transverse magnetization increases

C)Proton density increases

D)Image contrast is created

Explanation / Answer

1=C (increases the signal noise)

2=A (localized vurns due to metallic implants)

3=D(none of the above)

4=A(true)

5=C(both methods produce cross-section image at a specified plane through the body)

6=B(false)

7=A,B,C,D

8=A&D(longitudinal magnetization increases&image contrast is created).

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