QUESTIONS WITH SOLUTIONS GRADED A+
● A 180 degree RF pulse contains how much more energy than a 90 degree RF pulse?.
Answer: 4X
● According to the ACR manual on MRI Safety 2020, an aneurysm placed in 2019 at a
reputable facility using MR tested clips would hold what level of risk to our patient?. Answer:
LOW
● TRUE/FALSE? According to the ACR Manual on MRI Safety 2020, it is recommended to
stop and perform a final check to makes sure that you are scanning the correct patient and
have a screening sheet which had been reviewed.. Answer: TRUE
● According to the ACR manual on MRI Safety 2020, what is the half wavelength at 7T which
place a patient at risk of resonant burns?. Answer: 5-7 CM
● TRUE/FALSE? According to the IEC 60601-2- 33 document, it is fine to scan a pregnant
woman in the first trimester.. Answer: FALSE
● According to the Veterans Health Administration directive on MRI 2013, it is recommended
that how many technologists be working within zone 2?. Answer: TWO
● A/m defines what?. Answer: MAGNETIC FIELD STRENGTH
● As we increase body size, SAR will increase by how much?. Answer: SQUARED
● As we increase field strength, SAR will increase by how much?. Answer: SQUARED
● B0 defines what?. Answer: MAGNETIC FLUX DENSITY
● B1+rms is measured in what?. Answer: W/kg; J/kg; Microtelsa(mT)
● Can a patient be scanned at 3T if the MR conditions state that n implanted device can be
scanned at 128MHz?. Answer: YES
● A condition states that an implanted device can be scanned at 63MHz, this means what?.
Answer: It can be scanned at 1.5T
, ● Copper has a weekly repulsive force in the presence of a magnetic source. It is considered
what?. Answer: Diamagnetic
● The created chance for induced current in our patient would be found where?. Answer:
Peripherial to isocenter
● Delivering more RF pulses to our patient will do what?. Answer: Increase heating
● FPO:B will do what?. Answer: It will limit B1+rms and slew rate
● Gadolinium contrast will do what to T1 and T2 relaxation?. Answer: It will shorten it
● Tightly packed lines of magnetic flux are described as?. Answer: Magnetic flux density
● An implant condition states that an implant can only be scanned in normal mode whole
body. What does this mean?. Answer: We are limited to 4 W/kg. We can scan up to 3T. We
are liming to 2 W/kg.
● In a gradient profile, which of the following describe a period of time where the gradients
are not changing?. Answer: Duty cycle
● In a gradient profile, which of the following describe the strength a gradient will be activated
in mT/m?. Answer: Maximum gradient
● Increasing repetition time will do what to induced currents in our patient?. Answer:
Decrease
● Iron has a very strong attractive force in the presence of a magnetic source. This is
considered?. Answer: Ferromagnetic
● TRUE/FALSE? It is acceptable to use an MRI screening sheet which was completed three
days prior to a patient receiving an MRI exam.. Answer: FALSE
● Magnetic flux travel from the _____ pole to the _____ pole of a magnetic source.. Answer:
North ; South
● Magneto phosphenes and confusion can occur after a quench and are caused by what?.
Answer: Deteriorating magnetic field
● Normal mode limits the operation of the gradient coils to _____ its maximum.. Answer: 80%
● An object is strongly attracted to a magnetic source. We can say that an object that
behaves this way has a _____ susceptibility.. Answer: High