MRI CAMRT Exam
2 factors that T1 and T2 relaxation rely on - ANS--if molecular tumbling charge fits the larmour
frequency of hydrogen = properly power transfer
-if molecules are closely packed collectively
2 parameters that exchange the sampling window - ANS-RBW and frequency matrix which
therefore influences the minimum TE
3 fields utilized in MRI - ANS--static magnetic discipline
-TVMF (gradient area)
-RF discipline
3 predominant forms of magnets used - ANS--Superconducting (most common_
-Resistive
-Permanent
three procedures that effect weighting in GRE - ANS--Extrinsic parameters: TR, TE, FA
-The steady kingdom
-Residual transverse magnetization
three sorts of ferromagnetic materials? - ANS-iron, cobalt, nickel
3 types of motion in an atom - ANS-(1) Electron on its axis (2) Electron around the nucleus (3)
Nucleus on its axis
ADC is ___ in areas with constrained diffusion (because of pathology) which seems ___ at the
DWI photographs - ANS-low, shiny
Low ADC = now not freely moving, gets rephased by 2d gradient and appears bright
Apparent diffusion coefficient (ADC). - ANS-The internet displacement of molecules diffusing
across a place of tissue per 2nd
Appearances of fat and water on T1 - ANS-Fat - shiny, recovers quicker than water & more
magnetization to be flipped into transverse aircraft
Water- dark, recovers slower so much less magnetization flipped into transverse plane
Appearances of fats and water on T2 - ANS-Fat- dark, T2 time is faster (short) so more
dephasing and less coherent transverse magnetization
Water- vivid, T2 time of water is longer so there's greater coherent (in-phase) transverse
magnetization
, As Bo increases what happens to the difference in energy between excessive and coffee
electricity states - ANS-will increase - more spins aligned to Bo means larger NMV because of
this greater sign
Balanced gradient echo sequences - ANS-Uses variable flip to prevent saturation
Used to accurate for go with the flow artifacts, glide repayment
Benefits of isotropic voxels - ANS-Equal decision in every plane
Biggest component controlling SNR - ANS-The FOV
Biological consequences of the TVMF - ANS--Fibrillation
-Electroshock
-Visual phosphenes
-Peripheral nerve stimulation
Bradycardia - ANS-Slow heart charge less than 60 bpm
Centre lines of okay area incorporates ____ signal and ____ resolution - ANS-High, Low
Chemical shift equation - ANS-Chemical shift frequency = wo (processional frequency) x Cs
(chemical shift 3.5ppm)
Coherent gradient sequences - ANS-Mostly T2* weighted
-water is vibrant
-angiographic, arthrographic, and myelographic impact
Contrast to Noise Ratio (CNR) - ANS-difference in SNR among two points
Conventional spin echo - ANS-Called the gold wellknown. Can be used for each exam. High
SNR. Can reveal T1, T2 and PD weighted pictures. Only one line of k-space crammed in
keeping with TR. Long test time
Define phase, in segment, and out of section - ANS-function of magnetic moments on their
precessional direction
In segment/coherent - at the same region on the path
Out of section/incoherent - at special locations on direction
Define resonance - ANS-A phenomenon that occurs when objects clearly vibrate on the same
frequency
2 factors that T1 and T2 relaxation rely on - ANS--if molecular tumbling charge fits the larmour
frequency of hydrogen = properly power transfer
-if molecules are closely packed collectively
2 parameters that exchange the sampling window - ANS-RBW and frequency matrix which
therefore influences the minimum TE
3 fields utilized in MRI - ANS--static magnetic discipline
-TVMF (gradient area)
-RF discipline
3 predominant forms of magnets used - ANS--Superconducting (most common_
-Resistive
-Permanent
three procedures that effect weighting in GRE - ANS--Extrinsic parameters: TR, TE, FA
-The steady kingdom
-Residual transverse magnetization
three sorts of ferromagnetic materials? - ANS-iron, cobalt, nickel
3 types of motion in an atom - ANS-(1) Electron on its axis (2) Electron around the nucleus (3)
Nucleus on its axis
ADC is ___ in areas with constrained diffusion (because of pathology) which seems ___ at the
DWI photographs - ANS-low, shiny
Low ADC = now not freely moving, gets rephased by 2d gradient and appears bright
Apparent diffusion coefficient (ADC). - ANS-The internet displacement of molecules diffusing
across a place of tissue per 2nd
Appearances of fat and water on T1 - ANS-Fat - shiny, recovers quicker than water & more
magnetization to be flipped into transverse aircraft
Water- dark, recovers slower so much less magnetization flipped into transverse plane
Appearances of fats and water on T2 - ANS-Fat- dark, T2 time is faster (short) so more
dephasing and less coherent transverse magnetization
Water- vivid, T2 time of water is longer so there's greater coherent (in-phase) transverse
magnetization
, As Bo increases what happens to the difference in energy between excessive and coffee
electricity states - ANS-will increase - more spins aligned to Bo means larger NMV because of
this greater sign
Balanced gradient echo sequences - ANS-Uses variable flip to prevent saturation
Used to accurate for go with the flow artifacts, glide repayment
Benefits of isotropic voxels - ANS-Equal decision in every plane
Biggest component controlling SNR - ANS-The FOV
Biological consequences of the TVMF - ANS--Fibrillation
-Electroshock
-Visual phosphenes
-Peripheral nerve stimulation
Bradycardia - ANS-Slow heart charge less than 60 bpm
Centre lines of okay area incorporates ____ signal and ____ resolution - ANS-High, Low
Chemical shift equation - ANS-Chemical shift frequency = wo (processional frequency) x Cs
(chemical shift 3.5ppm)
Coherent gradient sequences - ANS-Mostly T2* weighted
-water is vibrant
-angiographic, arthrographic, and myelographic impact
Contrast to Noise Ratio (CNR) - ANS-difference in SNR among two points
Conventional spin echo - ANS-Called the gold wellknown. Can be used for each exam. High
SNR. Can reveal T1, T2 and PD weighted pictures. Only one line of k-space crammed in
keeping with TR. Long test time
Define phase, in segment, and out of section - ANS-function of magnetic moments on their
precessional direction
In segment/coherent - at the same region on the path
Out of section/incoherent - at special locations on direction
Define resonance - ANS-A phenomenon that occurs when objects clearly vibrate on the same
frequency
