Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

MRSO 2 > Rite ad 1 > Flashcards

Rite ad 1 Flashcards

1
Q

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

A

4x

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

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

A

low

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

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

A

5-7 cm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

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

A

false

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

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

A

two

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

A/m defines

A

magnetic field strength

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

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

A

squared

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

as we increase field strength SAR will increase by how much

A

squared

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

BO defines

A

magnetic flux density

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

B1+rms is measured in what

A

W/kg J/kg microtesla

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

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

A

Yes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

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

A

it can be scanned at 1.5TY

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

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

A

Diamagnetic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

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

A

peripheral to isocenter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

delivering more RF pulses to a patient will do what

A

increase heating

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

FPO:B will do what

A

it will limit B1+rms and slew rate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

gadolinium contrast will to what to T1 and T2 relaxation

A

shorten it

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

how tightly packed the lines of magnetic flux are descibed how

A

magnetic flux density

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

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

A

we are limited to 2W.kg whole body SAR

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

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

A

duty cycle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

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

A

maximun gradient

22
Q

increasing TR will __________induced currents in our p[atient

A

decrease

23
Q

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

A

ferromagnetic

24
Q

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

A

false

25
Q

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

A

North South

26
Q

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

A

deteriorating magnetic field

27
Q

normal mode limits the operation of the gradient coils to_________its maximum

A

80%

28
Q

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

A

high

29
Q

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

A

true

30
Q

the purpose of an MRi screening sheet is to do what

A

evaluate for any risks to the patient

31
Q

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

A

echo train length

32
Q

the RF field will determine which of the following primarily

A

heating

33
Q

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

A

6 min

34
Q

SAR is measured in

A

W/kg

35
Q

SAR limites are set for which of the following

A

individual pulse sequences

36
Q

SED is measure in what

A

J/kg

37
Q

Steeper gradient which are switching fast will ________induced currents

A

increase

38
Q

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

A

paramagnetic

39
Q

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

A

an kidney issues/singel kidny/diabetes

40
Q

what cryogen do we use in MRI

A

helium

41
Q

what does B1 refer to

A

time varying RF field

42
Q

what does the + refer to in B1+rms

A

the energy yielding portion of the RF field

43
Q

what does the rms refer to in B1+rms

A

rounded value of energy producing RF

44
Q

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

A

uncontrollable fire in zone 4

45
Q

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

A

quench

46
Q

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

A

30

47
Q

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

A

low

48
Q

what is the level of risk associated with a cardiac stent

A

low

49
Q

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

A

3
.2W/kg

50
Q

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

A

8T

MRSO 2 (17 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions