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MRI Module 1 Quiz
MRI Module 1
Terms in this set (25)
What type of non-ionizing radiation does MRI use?
What advantages does MRI imaging have compared with other modalities?
-no repositioning to acquire sagittal, coronal and axial planes
-superior contrast resolution
-use of no ionizing radiation
Which scanner types work well for large claustrophobic patients?
short bore, open bore and high field
What is NOT a characteristic of a superconducting magnet?
field strengths are limited to below 2T
What is not a contraindication for entering the MR suite?
What is the correct order of magnet arrangements from weakest to strongest magnetic field?
resistive, permanent, superconducting
Preventing potentially serious injury or death from strong magnetic field strengths requires:
a knowledgeable and concerned tech, controlled access to the magnetic field, and a detailed medical history of anyone entering the room
An image acquisition that divides the body into front and back halves is called:
Who received the Nobel Prize in Physiology or Medicine for their magnetic resonance imaging research?
Sir Peter Mansfield and Paul Lauterbur
Under normal conditions the MR magnetic field is always on...T/F
When protons spin, they
create a small magnetic field, and create a small magnetic moment
The process of producing voltage using magnetic fields is called
electromagnetic induction and the Faraday Law
Why are hydrogen protons used to create MR images?
they have an odd number of protons, and they are abundant in the human body
More hydrogen protons are aligned parallel to the main magnetic field in the ____ energy state.
Net magnetization is the
magnetic moment of unpaired nuclei, measurable amount of magnetization, and balance between spin-up and spin-down nuclei
The static magnetic field is abbreviated as
Which unit of measurement is used to measure homogeneity?
parts per million (ppm)
The phenomenon that causes protons to wobble when influenced by Bo is called
The speed of precessional frequency of a patient's hydrogen protons is
dependent on the Bo strength, the rate that the magnetization wobbles, and called the Larmor frequency
What does NOT have to happen for resonance to occur?
magnetic field strength must be greater than 0.2 T
Transverse magnetization is NOT
parallel to the Bo
The direction parallel to the Bo is the
longitudinal direction, and Z axis
T1 and T2 relaxation times occur
as excess RF energy is release and as RF energy is stopped
Fusing MR images with positron emission tomography (PET) offers better ______ than PET fused with computed tomography.
What is true regarding T2 relaxation?
it occurs at the same time as T1 relaxation
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