Download ARMRIT practice tests with answers and more Exams Radiography in PDF only on Docsity!
ARMRIT|\practice|\tests|\with|\answers
The |\ 2 |\types |\of |\enhancement |\media |\described |\by |\Lauffer, |
the |\mechanism |\of |\T1 |\agents |\is |- |\CORRECT |\ANSWERS |
✔✔to |\decrease |\T1 |\relaxation |\time, |\thus |\emitting |\high |
signal An |\analogy |\for |\the |\decoding |\of |\the |\MR |\signal |\through |
Fourier |\Transform |- |\CORRECT |\ANSWERS |\✔✔Basilar |
membrane |\processing |\sound Logically |\each |\line |\of |\phase |\encoding |\data |\is |\combined |\to |\allow |\the |\FT |\to |\determine |\the |\position |\along |\the |\y-axis. |
The |\number |\of |\phase |\encoding |\steps |\determines |- |
CORRECT |\ANSWERS |\✔✔the |\number |\of |\pixels |\along |\the |\y- axis In |\a |\gradient |\echo |\pulse |\sequence, |\which |\flip |\angle |\will |
produce |\a |\T2 |\weighted |\gradient |\echo |\image. |- |\CORRECT |
ANSWERS |\✔✔>20 |- |<45 |\degree |\flip |\angle In |\a |\horizontal |\magnet, |\what |\is |\the |\primary |\Gs |(slice |
select |\gradient) |\for |\an |\axial |\slice |- |\CORRECT |\ANSWERS |
✔✔Gz |(axial |\slice)
A |\linear |\relationship |\between |\frequency |\and |\position |\is |
superimposed |\on |\Bo |\by |\the |\Gp |(phase |\encoding |
gradient). |\The |\Hydrogen |\protons |\relative |\precessional |
frequencies |\determine |- |\CORRECT |\ANSWERS |\✔✔phase |
shifts Combining |\a |\metal |\ion |\with |\a |\ligand |\reduces |\their |
tendency |\to |\bind |\to |\proteins, |\enzymes, |\or |\membranes. |
The |\degree |\to |\which |\they |\dissociate |\is |\a |\measure |\of |\their |- |\CORRECT |\ANSWERS |\✔✔toxicity In |\a |\phase |\sequence |\employing |\2DFT, |\the |\time |\can |\be |
calculated |\using |\which |\formula |- |\CORRECT |\ANSWERS |
✔✔TR |\x |\NEX |\x |\Matrix What |\pulse |\imaging |\technique |\is |\in |\all |\implementations |\of |\MRA |- |\CORRECT |\ANSWERS |\✔✔gradient |\echo What |\year |\was |\the |\first |\MRI |\enhancement |\agent |
approved |\for |\clinical |\use |- |\CORRECT |\ANSWERS |\✔✔ 1988 Increasing |\NEX |- |\CORRECT |\ANSWERS |\✔✔Increase |\SNR |
and |\Resolution
A |\generation |\of |\phase |\differences |\along |\a |\particular |
direction |\of |\a |\slice |- |\CORRECT |\ANSWERS |\✔✔phase |
encoding Who |\described |\the |\mathematical |\method |\of |\converting |\a |
time-varying |\signal |\into |\its |\frequency |\components |\which |
are |\used |\to |\obtain |\positional |\information |\from |\the |\MR |
signal |- |\CORRECT |\ANSWERS |\✔✔Jean |\Baptiste |- |\Joseph |
Fourier A |\generation |\of |\frequency |\differences |\along |\a |\particular |
direction |\of |\a |\slice |\is |\called |- |\CORRECT |\ANSWERS |
✔✔frequency |\encoding In |\a |\horizontal |\field |\magnet |\what |\is |\the |\primary |\Gs |(slice |
select |\gradient) |\for |\a |\sagittal |\slice |- |\CORRECT |\ANSWERS |
✔✔Gx |(sagittal |\slice) Pixel |\size |\formula |- |\CORRECT |\ANSWERS |\✔✔FOV/Matrix In |\an |\IR |\pulse |\sequence |\what |\will |\produce |\a |\STIR |\fat |
suppressed |\pulse |\sequence |- |\CORRECT |\ANSWERS |\✔✔IR |\of |\ 80 |- |\120ms
Decrease |\slice |\thickness |- |\CORRECT |\ANSWERS |
✔✔decreases |\SNR When |\selecting |\a |\volume |\of |\slices, |\which |\method |\for |
providing |\spatial |\encoding |\is |\employed |- |\CORRECT |
ANSWERS |\✔✔3DFT The |\purpose |\of |\the |\first |\use |\of |\metal |\ions |\in |\MRI |
enhancement |\like |\Gadolinium |\is |\to |- |\CORRECT |\ANSWERS |
✔✔Decrease |\relaxation |\time |\for |\Hydrogen |\in |\the |\tissue Which |\type |\of |\MRI |\magnet |\is |\made |\up |\of |\naturally |
ferromagnetic |\material |- |\CORRECT |\ANSWERS |
✔✔superconductive |\magnet Which |\type |\of |\receiver |\RF |\coil |\is |\placed |\close |\to |\the |
patients |\body |\for |\the |\purpose |\of |\superficial |\anatomic |
structures |- |\CORRECT |\ANSWERS |\✔✔surface |\coils The |\tissue |\characteristic |\that |\provides |\more |\tissue |
contrast |\and |\and |\pathology |\information |\is |- |\CORRECT |
ANSWERS |\✔✔T2 |\effects The |\longitudinal |\component |\of |\the |\NMV |\is |\designated |\as |- |\CORRECT |\ANSWERS |\✔✔Mz
In |\comparison |\to |\CAT |\an |\advantage |\of |\MRI |\is |- |\CORRECT |
ANSWERS |\✔✔superior |\soft |\tissue |\resolution The |\main |\magnetic |\field |\of |\MRI |\systems |\in |\clinical |\use |
must |\meet |\an |\acceptable |\specification |\of |- |\CORRECT |
ANSWERS |\✔✔20-30 |\ppm As |\the |\Nmv |\precesses |\within |\the |\transverse |\plane, |\it |
induces |\an |\electrical |\current |\in |\a |- |\CORRECT |\ANSWERS |
✔✔RF |\coil The |\T2 |\process |\is |\also |\known |\as |- |\CORRECT |\ANSWERS |
✔✔Spin-Spin Immediately |\after |\an |\initial |\ 90 |\degree |\RF |\pulse |\is |\turned |
off |\the |\Hydrogen |\protons |\begin |\to |- |\CORRECT |\ANSWERS |
✔✔Dephase A |\ 90 |\degree |\pulse |\will |\alter |\the |\NVM, |\another |\effect |\is |- |
CORRECT |\ANSWERS |\✔✔the |\hydrogen |\protons |\will |\have |
phase |\coherence Of |\the |\following |\RF |\pulse |\flip |\angles, |\which |\is |\the |\smallest |\that |\will |\produce |\the |\maximum |\signal |- |\CORRECT |
ANSWERS |\✔✔ 180 |\degree
What |\is |\the |\gyromagnetic |\ratio |\of |\Hydrogen |- |\CORRECT |
ANSWERS |\✔✔42.58 |\MHz/T When |\is |\the |\NMV |\at |\its |\maximum |\magnitude |- |\CORRECT |
ANSWERS |\✔✔at |\equilibrium The |\process |\of |\MR |\angiography |\is |\to |\image |- |\CORRECT |
ANSWERS |\✔✔blood |\flow The |\main |\magnetic |\field |\of |\the |\MRI |\system |\is |\described |\as |\constant |\and |\always |\oriented |\in |\one |\direction, |\either |
horizontal |\or |\vertical. |\The |\transmit |\RF, |\in |\comparison, |\is |
decided |\as |- |\CORRECT |\ANSWERS |\✔✔oscillating |\and |
always |\perpendicular |\to |\Bo |(main |\magnetic |\field) After |\a |\ 90 |\degree |\RF |\pulse, |\the |\NMV |\begins |\to |\return |\to |
equilibrium. |\When |\the |\NMV |\is |\half-way |\between |
transverse |\and |\equilibrium, |\what |\are |\the |\magnitudes |\of |
the |\longitudinal |\component |\and |\the |\transverse |
component. |- |\CORRECT |\ANSWERS |\✔✔longitudinal |
component |\greater |\than |\zero, |\transverse |\component |
greater |\than |\zero
A |\sine |\wave |\is |\a |\symbol |\used |\to |\measure |\electromagnetic |\energy. |\A |\sine |\wave's |\two |\components |\of |\measurement |
are |- |\CORRECT |\ANSWERS |\✔✔wavelength |\and |\frequency Tissues |\that |\are |\less |\efficient |\at |\spin-spin |\interactions |
because |\they |\contain |\more |\free |\water |\such |\as |\CSF, |
should |\have |- |\CORRECT |\ANSWERS |\✔✔high |\T2 |\values |\and |
produce |\HYPERintense |\signal An |\explosive |\boiling |\off |\of |\liquid |\helium |\and/or |\liquid |
nitrogen |\and |\sudden |\loss |\of |\superconductivity |\is |\known |
as |\a |- |\CORRECT |\ANSWERS |\✔✔quench SAR |\is |\the |\rate |\that |\electromagnetic |\energy |\is |\introduced |
to |\body |\tissue, |\measured |\in |- |\CORRECT |\ANSWERS |
✔✔watts |\per |\kilogram, |\w/Kg SAR |- |\CORRECT |\ANSWERS |\✔✔Specific |\Absorption |\Rate Painful |\peripheral |\nerve |\stimulation |\can |\be |\caused |\by |- |
CORRECT |\ANSWERS |\✔✔gradient |\magnetic |\field Of |\the |\following |\categories |\pf |\patients |\which |\one |\would |
not |\present |\any |\special |\safety |\considerations |- |\CORRECT |\
ANSWERS |\✔✔patients |\with |\previous |\arthroscopic |\knee |
surgery Side |\effects |\associated |\with |\the |\main |\magnetic |\field |\are |- |
CORRECT |\ANSWERS |\✔✔tissue |\heating |\and |\cataract |
formation Magnetophosphens |\are |\described |\as |- |\CORRECT |
ANSWERS |\✔✔seeing |\flashes |\of |\light Acoustic |\noise |\is |\experienced |\during |\an |\MRI |\study |\and |\is |
caused |\by |- |\CORRECT |\ANSWERS |\✔✔gradient |\magnetic |
field the |\MRI |\environment, |\especially |\the |\MRI |\scan |\room, |\is |
ultimately |\the |\responsibility |\of |\the |- |\CORRECT |\ANSWERS |
✔✔MRI |\tech |\on |\duty Passed |\through |\a |\strong |\magnetic |\field, |\some |\implanted |
and |\ferromagnetic |\devices |\such |\as |\neurostimulators, |
aneurism |\clips |\may |\experience |- |\CORRECT |\ANSWERS |
✔✔torque Ferromagnetic |\objects |\such |\as |\scissors, |\guns, |\and |\some |
mechanical |\tools |\are |\extremely |\dangerous |\and |\never |\
the |\field |\strength |\of |- |\CORRECT |\ANSWERS |\✔✔any |
strength Guidelines |\which |\exclude |\pregnant |\individuals |\from |
exposure |\to |\MRI |\are |\mainly |\to |\protect |\the |\individual |\from |
the |- |\CORRECT |\ANSWERS |\✔✔RF |(radio |\frequency) Prior |\to |\entering |\the |\MRI |\environment |\all |\patients |\and |
individuals |\must |\be |\screened |- |\CORRECT |\ANSWERS |
✔✔verbally |\and |\written Exposure |\to |\GMF |\are |\based |\on |\the |\premis |\that |\the |\fields |
should |\be |\to |\weak |\to |\cause |\neuromuscular |\stimulation |\by |\at |\least |\a |\factor |\of |- |\CORRECT |\ANSWERS |\✔✔ 3 currently |\there |\is |\no |\evidence |\of |\a |\threat |\to |\fetal |
development |\from |\exposure |\to |- |\CORRECT |\ANSWERS |
✔✔magnetic |\resonance Maximum |\exposure |\to |\extremities |\from |\the |\main |
magnetic |\field |\is |- |\CORRECT |\ANSWERS |\✔✔5T Patients |\with |\cardiac |\pacemakers |\are |\contraindicated |\for |
a |\MRI |\scan |\in |\MR |\magnets |\with |\a |\field |\strength |\of |- |
CORRECT |\ANSWERS |\✔✔any |\strength
Maximum |\exposure |\to |\gradient |\fields |\is |\set |\at |\a |\rate |\of |- |
CORRECT |\ANSWERS |\✔✔6T/sec The |\maximum |\exposure |\to |\the |\head |\and |\trunk |\from |\the |
main |\magnetic |\field |\is |- |\CORRECT |\ANSWERS |\✔✔5T Currently |\pregnant |\patient |\and |\personnel |\are |\excluded |
from |\exposure |\to |\MRI |\for |\the |- |\CORRECT |\ANSWERS |\✔✔1st |\trimester Of |\the |\following, |\the |\one |\that |\is |\absolutely |
contraindicated |\for |\an |\MRI |\study |\is |- |\CORRECT |\ANSWERS |
✔✔cardiac |\pacemaker The |\best |\way |\to |\lesson |\effects |\of |\acoustic |\noice |\during |\an |\MRI |\study |\is |\to |- |\CORRECT |\ANSWERS |\✔✔offer |\patient |
disposable |\ear |\pulgs A |\ferromagnetic |\object |\in |\the |\shape |\of |\a |\sphere |\will |\not |
experience |- |\CORRECT |\ANSWERS |\✔✔torque The |\factor |\that |\determines |\the |\calculated |\SAR |\average |\is |- |\CORRECT |\ANSWERS |\✔✔patient |\weight |\in |\Kilograms
In |\general, |\parameters |\for |\T1 |\and |\T2 |\weighted |\images |
are |\as |\follows |- |\CORRECT |\ANSWERS |\✔✔T1= |\TR |\100- 1000ms, |\TE |\20-30ms T2= |\TR |\1600-3000ms, |\TE |\70-100ms When |\selecting |\only |\one |\slice |\at |\a |\time |\during |\a |\pulse |
sequence |\which |\method |\for |\providing |\spacial |\localization |
is |\employed |- |\CORRECT |\ANSWERS |\✔✔2DFT Information |\acquired |\when |\you |\increase |\or |\decrease |\the |
frequency |\of |\the |\RF |\pulse |\of |\the |\Gs, |\causing |\the |\center |\of |
the |\excited |\pulse |\to |\change |\with |\the |\center |\of |\the |\Gs |\RF |
pulse |\is |- |\CORRECT |\ANSWERS |\✔✔slice |\position Decrease |\the |\NEX |- |\CORRECT |\ANSWERS |\✔✔Decrease |\SNR |\and |\Resolution At |\any |\one |\time, |\human |\body |\tissue, |\in |\general, |\is |\made |
up |\of |\50-90% |\of |\what |\substance |- |\CORRECT |\ANSWERS |
✔✔H2O The |\strength |\of |\very |\large |\magnetic |\fields |\like |\those |
employed |\in |\MRIsystems, |\the |\SI |\unit |\most |\commonly |
used |\is |- |\CORRECT |\ANSWERS |\✔✔Tesla
Which |\type |\of |\MRI |\magnet |\requires |\a |\steady |\current |\of |
electricity |\in |\coils |\of |\conductor |\wrapped |\around |\an |\air |\or |
iron |\core |- |\CORRECT |\ANSWERS |\✔✔Resistive |\magnet In |\a |\pulse |\sequence, |\transmitting |\an |\initial |\ 90 |\degree |\RF |
pulse |\will |\cause |\the |\NMV |\to |- |\CORRECT |\ANSWERS |\✔✔Shift |\in |\both |\size |\and |\direction To |\describe |\the |\uniformity |\of |\the |\MRI |\system's |\main |
magnetic |\field, |\the |\term |\employed |\is |- |\CORRECT |
ANSWERS |\✔✔Homogeneity Magnetic |\susceptibility |- |\CORRECT |\ANSWERS |
✔✔Tendancy |\of |\a |\substance |\to |\attract |\or |\repel |\magnetic |
lines |\of |\force |\which |\is |\decided |\by |\the |\magnetic |\properties |\of |\its |\electrons Because |\of |\the |\spinning |\motion |\of |\the |\hydrogen |\proton |\it |
has |\the |\same |\properties |\as |\a |\bar |\magnet. |\The |\hydrogen |
protons |\spinning |\motion |\gives |\it |\a |- |\CORRECT |\ANSWERS |
✔✔Magnetic |\moment On |\a |\very |\basic |\level, |\the |\ 3 |\basic |\componants |\required |\to |
attain |\MR |\signals |\are |- |\CORRECT |\ANSWERS |\✔✔Magnetic |
field, |\proton, |\radio-wave
The |\longitudinal |\component |\of |\the |\NMV |\is |\designated |- |
CORRECT |\ANSWERS |\✔✔Mz Of |\the |\following |\statements, |\which |\describes |\part |\of |\the |
basic |\MR |\imaging |\process |- |\CORRECT |\ANSWERS |\✔✔Radio |
frequency |\signals |\interact |\with |\hydrogen |\protons In |\the |\USA, |\the |\MRI |\system;s |\main |\magnetic |\field |\and |\the |
vector |\that |\represents |\it |\is |\symbolized |- |\CORRECT |
ANSWERS |\✔✔Bo T2 |\is |\the |\measurement |\of |\time |\for |\the |\transverse |
component |\of |\the |\NMV |\to |\decrease |\what |\percentage |\of |\its |\maximum |\value |\after |\the |\application |\of |\a |\ 90 |\degree |\RF |
pulse |- |\CORRECT |\ANSWERS |\✔✔37% Once |\the |\patients |\area |\of |\interest |\is |\placed |\in |\the |\main |
magnetic |\field |\of |\the |\MRI |\system, |\the |\hydrogenprotons |
will |- |\CORRECT |\ANSWERS |\✔✔Precess |\parallel |\to |\Bo On |\a |\proton |\density |\image, |\two |\types |\of |\tissue |\that |
contain |\very |\low |\concentration |\of |\hydrogen |\and |\appear |
very |\hypo |\intense |\are |- |\CORRECT |\ANSWERS |\✔✔Cortical |
bone |\and |\lung
Which |\type |\of |\MRI |\magnet |\requires |\cryogen |\to |\cool |
magnetic |\coils |\to |\ 4 |\degrees |\Kalvin |- |\CORRECT |\ANSWERS |
✔✔Superconductive In |\a |\loop |\of |\conductor |\in |\which |\an |\electronic |\current |\is |
introduced |\and |\maintained, |\a |\magnetic |\field |\will |\be |
produced |\in |\the |\center |\perpendicular |\to |\the |\flow |\of |
electric |\current. |\This |\is |\called |- |\CORRECT |\ANSWERS |
✔✔Faradays |\Law Which |\cryogenic |\material |\can |\produce |\temperatures |\up |
to |\ 4 |\degrees |\kalvin |- |\CORRECT |\ANSWERS |\✔✔Liquid |
helium The |\component |\Mxy |\is |\most |\associated |\with |- |\CORRECT |
ANSWERS |\✔✔Transverse |\to |\Bo, |\T2 |\relaxation, |\transverse |
magnetization A |\technique |\to |\avoid |"cross |\talk" |\between |\slices |\with |\little |\or |\no |\slice |\interval |\is |- |\CORRECT |\ANSWERS |
✔✔Interleaving The |\number |(#) |\of |\slices |\formula |\is |- |\CORRECT |\ANSWERS |
✔✔TR |/ |(TE |+ |^)
