PHYS/BIOL 464 Medical Imaging Instrumentation MRI HW 6B 1. What is the maximum s

ID: 2035498 • Letter: P

Question

PHYS/BIOL 464 Medical Imaging Instrumentation

MRI HW 6B

1. What is the maximum strength of magnet approved for medical imaging of patients?

A. 7T

B. 5T

C. 3T

D. 1.5T

2.What does precession mean?

A. The spinning of hydrogen protons around their own axis.

B. The change in orientation of hydrogen molecules when exposed to radiowaves at the Larmor frequency.

C. The wobble of hydrogen protons exposed to a large magnetic field.

D. Water molecules gain an extra molecule of hydrogen when exposed to a magnetic field.

3. Which of these is a disadvantage of MRI?

A. High dose of ionizing radiation.

B. Shows vasculature without contrast

C. Unsuitable for pacemaker wearers

D. Two-dimensional images

4. In MRI the resonant frequency of a specific tissue is NOT determined or affected by the:

A. Specific isotope being imaged

B. Characteristics of the molecule

C. Orientation of magnetic field

D. Strength of the magnetic field

PHYS/BIOL 464 Medical Imaging Instrumentation

MRI HW 6B

1) C) maximum strength of magnet approved for medical imaging of patients is 3 Tesla

3) C ) Unsuitable for pacemaker wearers

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