T2 is the measurement of time from the transverse component of the NMV to decrease what percentage
of its max value after the application of a 90 degree RF pulse - 37%
combining a metal ion with a ligand reduces their tendency to bind proteins, enzymes, or membranes,
the degree to which they dis...
ARMRIT review
T2 is the measurement of time from the transverse component of the NMV to decrease what percentage
of its max value after the application of a 90 degree RF pulse - 37%
combining a metal ion with a ligand reduces their tendency to bind proteins, enzymes, or membranes,
the degree to which they disassociate is a measure of: - toxicity
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 - precession
MRI is derived from the process known as - nuclear magnetic resonance
once the NMV has moved away from equilibrium, what will occur - the transverse component will
increase
some older implanted ferromagnetic neuro-aneurysm clips, suture materials, and surgical clips will
experience force of _______ as the arterial is passed through a strong magnetic field - torque
in MRI, substances respond to a specific radio frequency which is known as - resonance frequency
the introduction of gad based contrast agents by IV injection can involve passing through the BBB, what
are the tissue compartments involved - intravascular to interstitial
in the USA, the MRI's main magnetic field and the vector that represents it is symbolized - Bo
the resonance frequency of any substance in a magnetic field can be calculated by employing the -
Larmor equation
in a pulse sequence, transmitting an initial 90 degree RF pulse will cause the NMV to - shift in both
size and direction
, which type of electromagnetic could are designed to stimulate and detect an MR signal - RF coils
tissues that are less efficient at spin spin interactions because they contain more free water such as CSF
should have - high T2 values and produce hyperintense signals
magnetism can be defined as the ability to attract certain substances such as - iron, cobalt, and
nickel
the purpose of MRA is to image the - blood flow
the strength of very large magnetic fields like those employed in MRI systems, the SI unit most
commonly used is - tesla
the larmor frequency of hydrogen protons in a 1.5 T magnetic field is - 63.9MHz/tesla
in MRI, for a chemical substance to be affected by the main magnetic field and the radio wave it must
contain - an odd number of total protons and neutrons
a 1.5T magnetic field is equal to - 15,000 gauss
the components of the gyro magnetic ratio are - magnetic momentum to angular momentum
fast transition phenomenon and entry phenomenon are theories that explain which of the following
tissue characterists - velocity effects
the effects of main magnetic field inhomogenities on the FID signal are corrected in a spin echo
sequence by applying a second RF pulse. the flip angle of this RF pulse is - 180 degrees
describe the basic MR imaging process - RF signals interact with hydrogen protons
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