What is the maximum strength of magnet approved for medicalimaging of patients?
7T
5T
3T
1.5T
What does precession mean?
The spinning of hydrogen protons around their own axis.
The change in orientation of hydrogen molecules when exposed toradiowaves at the Larmor frequency.
The wobble of hydrogen protons exposed to a large magneticfield.
Water molecules gain an extra molecule of hydrogen when exposedto a magnetic field.
Which of these is a disadvantage of MRI?
High dose of ionizing radiation.
Shows vasculature without contrast
Unsuitable for pacemaker wearers
Two-dimensional images
In MRI the resonant frequency of a specific tissue is NOTdetermined or affected by the:
Specific isotope being imaged
Characteristics of the molecule
Orientation of magnetic field
Strength of the magnetic field
