PHYSICS EXIT EXAM 2024/2025 WITH 100% CORRECT ANSWERS
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Course
PHYSICS EXIT EX
Institution
PHYSICS EXIT EX
TOF MRA is sensitive to flow coming into the FOV or imaging volume spins and vessels with slow flow become saturated 2D TOF is best for areas of slower flow all of the vessels exhibit slow flow except————- which have higher velocity. correct answersIntracranial vessels
When imagining the...
TOF MRA is sensitive to flow coming into the FOV or imaging volume spins and vessels with slow flow
become saturated 2D TOF is best for areas of slower flow all of the vessels exhibit slow flow except
————- which have higher velocity. correct answersIntracranial vessels
When imagining the human body for clinical purposes in MRI we only are interested in : correct
answersH1
Coils that superimpose small magnetic fields within the patient during the scan and allow for spatial
encoding are : correct answersGradient coils
Shim coils are used to improve the inhomogeneities of the main magnetic field: T/F correct answersTRUE
Gadolinium is a ——— product : correct answersPARAMAGNETIC
Which type of magnet is capable of the greatest field strength? correct answersSuperconducting
When using a 5" receiver coil the depth of coverage is approximately _________ inches : correct
answers2.5
Which patients should you take the most precautions with concerning patients who are given
gadolinium? correct answersPregnant patients
Which of the following could result from scanning a patient with a cardiac pacemaker? correct
answersChanges of programming and induced current in lead wire/ patient burns
A 1.5 Tesla MRI scanner has a magnetic field strength equal to about _______ times that of the earth's
magnetic field: correct answers30,000
,The image parameter that primarily effects T1 weighted images is : correct answersRepetition time
An advantage of MRI over Computed Tomography (CT) is : correct answersSuperior soft tissue contrast
(resolution)
A 1 Tesla magnet is likely to be : correct answersSuperconductive
Originally, Magnetic Resonance Imaging was known by the name: correct answersnuclear magnetic
resonance
FFT stands for _______ correct answersFast Fourier Transform
After contrast is injected a paramagnetic contrast agent affects patient tissue in which of the following
ways: correct answersDecrease T1 and T2 relaxation times.
___________ is a technique that collects data continuously throughout the cardiac cycle. correct
answersCine
A possible danger from the varying gradient magnetic field is : correct answersDirect heating of tissue
and possible burns
Which of the following gradient echo sequences (FLASH) would produce a T1-weighted image? correct
answersTR 200
TE 18
75 degree flip angle
A disadvantage of MRI compared to CT is: correct answersSpecial (costly)site planning and shielding
In a T1 weighted image a short TE is used to : correct answersMinimize T2 effects
, MRI magnets that require a steady current of electricity passed through coils wrapped around an iron or
air core are: correct answersResistive
In a loop of conductor where an electric is introduced and maintained a magnetic field will be produced
in the center is attributed to: correct answersFaraday Law
When symbolizing the flow and area of a magnetic field, special lines are used, they are called : correct
answersField or flux
All substances will respond to a certain frequency in MRI we call this : correct answersResonance
frequency
Which of the following implants mat pose a problem during scanning? correct answersImplanted drug
infusion pumps
Cardiac pacemakers
Breast tissue expanders, and bone growth stimulators
Electromagnetic energy is symbolized by a sign wave that has two components of measurement they
are: correct answersWavelength and frequency
After M rotates away from Z, 90 degrees, it precesses within the transverse plane inducing the electric
current within the : correct answersRF coil
In a T1-weighted image a short TR is used to : correct answersMaximize T1 effects
MRI magnets described as giant versions of horseshoe magnets used as toys are : correct
answersPermanent
The Larmor Equation is : correct answersWo = Y x Bo
In a T2 weighted image a long TE is used to : correct answersMaximize T2 effects
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