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practice test 1 ARMRIT Questions and Answers
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practice test 1 ARMRIT
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practice test 1 ARMRITdifferent tissues that have signals that appear similar on a mr image are described as: -
answerisointense
In a large main magnetic field such as those employed in MRI, the motion of a hydrogen
proton has been described as wobbling like a spinning top. This motion is called: -
answerPrescession
Magnetic resonance imaging is derived from the process known as: - answerNuclear
magnetic resonance
Once the net magnetization vector (nmv) has moved away from equilibrium, the
following will occur: - answerThe transverse component will increase
In MRI, substances respond to a specific radio frequency which is known as: -
answerResonance Frequency
The introduction of gadolinum based contrast enhancement agents by intra-venous
injection can involve passing through as abnormal blood brain barrier. The tissue
compartments involved are the: - answerintravascular to interstitial
T2 is the measurement of time for the transverse compnent of the nmv to decrease
what percentage of its maximum value after application of a 90* radio-frequency pluse?
- answer37%
In the USA the MRI systems main magnet field and the vector that represents it is
symbolized - answerB0
the resonance frequency of any substance in a magnetic field can be calculated by
employing the - answerLarmor equation
in a pulse sequence transmitting a initial 90-degree radio frequency pulse will cause the
nmv to: - answershift in both size and direction
which type of electromagnetic coils are designed to stimulate and detect an MRI signal -
answerradio frequency coils
tissues that are less efficient at spin-spin interactions because they contain more free
water such as cerebral spinal fluid should have - answerHigh T2 values and produce
hyper-intense signals
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