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Question 1

a 180 deg pulse contains how much more energy than a 90 deg pulse

Answer 1

4x

Question 2

an aneurysm cip placed after 2019 at a reputible facility will place what risk to the patient

Answer 2

low

Question 3

which half wavelength at 7t will place a patient at rish from burns

Answer 3

5-7 cm

Question 4

according to the IEC 60601-233 doc, it is fine to scan a pregnant woman in the first trimester

Answer 4

false

Question 5

according to the VA Health directive of 2013 it is recommended that how many techs be working within zone 2

Answer 5

two

Question 6

A/m defines

Answer 6

magnetic field strength

Question 7

as we increase body size, SAR will increase by how much

Answer 7

squared

Question 8

as we increase field strength SAR will increase by how much

Answer 8

squared

Question 9

BO defines

Answer 9

magnetic flux density

Question 10

B1+rms is measured in what

Answer 10

W/kg J/kg microtesla

Question 11

can a patient be scanned at 3t if the conditions state the device can be scanned at 128MHz

Answer 11

Yes

Question 12

A condition states that an device can be scanned at 64MHZ, this means what

Answer 12

it can be scanned at 1.5TY

Question 13

Copper has a weakly repulsive force in the presence of a magnetic source, it is considered what?

Answer 13

Diamagnetic

Question 14

The created chance for induced current in a patient would be found at?

Answer 14

peripheral to isocenter

Question 15

delivering more RF pulses to a patient will do what

Answer 15

increase heating

Question 16

FPO:B will do what

Answer 16

it will limit B1+rms and slew rate

Question 17

gadolinium contrast will to what to T1 and T2 relaxation

Answer 17

shorten it

Question 18

how tightly packed the lines of magnetic flux are descibed how

Answer 18

magnetic flux density

Question 19

an implant condition states an implant can be scanned only in normal mode. What does this mean

Answer 19

we are limited to 2W.kg whole body SAR

Question 20

in a gradiant profile which of the following describes a period of time where the gradients are not changing

Answer 20

duty cycle

Question 21

in a gradiant profile which of the following describes the strength a gradient will be activated in mT/m

Answer 21

maximun gradient

Question 22

increasing TR will __________induced currents in our p[atient

Answer 22

decrease

Question 23

iron has a very strong attractive force in the presence of a magnet this is considered

Answer 23

ferromagnetic

Question 24

it is acceptable to use an MRI screening sheet which was completed 3 days prior to the patient receiving an MRI

Answer 24

false

Question 25

magnetic flux travel from the _____pole to the ______pole of a mangetic source

Answer 25

North South

Question 26

magnetophosphenes and confusion can occur after a quench and is caused by what

Answer 26

deteriorating magnetic field

Question 27

normal mode limits the operation of the gradient coils to_________its maximum

Answer 27

80%

Question 28

an object is strongly attracted to a magnetic source we can say that an object that behaves this way has a ______susceptibility

Answer 28

high

Question 29

patients shoulder remove their street clothes and any jewelry prior to having an MRI to reduce risk of injury

Answer 29

true

Question 30

the purpose of an MRi screening sheet is to do what

Answer 30

evaluate for any risks to the patient

Question 31

reducing which of the following will promote less heating in our patinet

Answer 31

echo train length

Question 32

the RF field will determine which of the following primarily

Answer 32

heating

Question 33

SAR in the controlled operating mode are measured over what period of time

Answer 33

6 min

Question 34

SAR is measured in

Answer 34

W/kg

Question 35

SAR limites are set for which of the following

Answer 35

individual pulse sequences

Question 36

SED is measure in what

Answer 36

J/kg

Question 37

Steeper gradient which are switching fast will ________induced currents

Answer 37

increase

Question 38

titanium has a weakly attractive force in the presence of a magnetc field. It is considered

Answer 38

paramagnetic

Question 39

what are risk factors that require labs to be drawn on a patient

Answer 39

an kidney issues/singel kidny/diabetes

Question 40

what cryogen do we use in MRI

Answer 40

helium

Question 41

what does B1 refer to

Answer 41

time varying RF field

Question 42

what does the + refer to in B1+rms

Answer 42

the energy yielding portion of the RF field

Question 43

what does the rms refer to in B1+rms

Answer 43

rounded value of energy producing RF

Question 44

what is a reason we may need to release helium from an MRI unit

Answer 44

uncontrollable fire in zone 4

Question 45

what is it called when we release the helium out of the MRI unit

Answer 45

quench

Question 46

what is the black box limit for eGFR where patients are recommended no to have contrast

Answer 46

30

Question 47

what is the associated level of risk associated with a copper T IUD

Answer 47

low

Question 48

what is the level of risk associated with a cardiac stent

Answer 48

low

Question 49

what is the limit of the SAR to the head in first level operating mode

Answer 49

3 .2W/kg

Question 50

what is the limit of the static magnetic field in the first operating mode

Answer 50

8T