Part C

Question 1

Ferrous material
a) is strongly attracted to the magnet
b) is not attracted to the magnet
c) exhibits a slight positive magnetic attraction
d) is repelled by the magnet

Answer 1

a) is strongly attracted to the magnet

Question 2

Paramagnetic materal
a) is strongly attracted to the magnet
b) is not attracted to the magnet
c) exhibits a slight positive magnetic attraction
d) is repelled by the magnet

Answer 2

c) exhibits a slight positive magnetic attraction

Question 3

Ferrous material can exhibit the following behaviour in an MRI system:
a) torque or twist
b) heat up
c) absorb RF
d) all of the above

Answer 3

D) all of the above

Question 4

The recommended method for clearing a patient who may have metal in the eye is:
a) physical exam
b) plain film of the orbits
c) split lamp examination
d) ultrasound examination

Answer 4

b) plain film of the orbits

Question 5

To protect patients from hearing damage it is recommended that hearing protection by used:
a) when scanning pregnant patients
b) when using fast spin echo sequences only
c) when doing EPI studies
d) with all patients

Answer 5

d) with all patients

Question 6

For patient safety, an ECG gating leads should be:
a) run straight out of the bore without touching the patient
b) looped tightly under the patients clothing
c) wrapped around an extremity for stability

Answer 6

a) run straight out of the bore without touching the patient

Question 7

Patients with VP shunts are safe to scan
a) YEs
b) No
c) under specified conditions

Answer 7

c) under specified conditions

Question 8

Only MR compatible monitoring equipment is used in the MR suite because:
a) other monitor will cause an RF artefact on scan images
b)They do not have metal in them
c) They have fibre optic pulse oximeter leads which are not a conductive material and this reduces the likelihood of skin burns.
d) A and C

Answer 8

D) A and C

Question 9

A patient had a tubal ligation many years ago and cannot recall whether the clips were used were metal or plastic. Which of the following statements is true:
a) All fallopian clip are metal and cannot be scanned
b) any force that may be exerted on the clips by the magnetic field is not going to be any more than the forces exerted upon them normally by peristalsis etc. so it is OK for her to have the scan.
c) As she is unsure, we should cancel the scan
d) She should have an x-ray of her pelvis to determine the nature of the clips.

Answer 9

b) any force that may be exerted on the clips by the magnetic field is not going to be any more than the forces exerted upon them normally by peristalsis.

Question 10

A patients presents with heavy black tattoos on his body. Do we show concern?
a) No. The tattoos are of no significance to MRI imaging
b) Yes. The pigments, especially black and dark colours can be ferrous and can result in oedema and skin irritation around the tattoo site.
c). No. Even though the tattoos are often made with pigments containing ferrous particles, if they have been there for more than 6 weeks they will not cause irritation to the skin and can be safely scanned.

Answer 10

b) Yes. The pigments, especially black and dark colours can be ferrous and can result in oedema and skin irritation around the tattoo site.

Question 11

An unconscious patient presents for a spinal MRI examination with a suspected history of previous brain surgery. The patient should therefore:
a) go through a thorough screening process including inspection for other surgical scars and performing spot radiographs
b) not undergo an MRI scan
c) only if the referring doctor has stated the patient is safe to scan.
d) A and C

Answer 11

d) A and C

Question 12

A quench refers to the sudden loss of magnet superconductivity when its temperature is raised. Associated with this there:
a) is a rapid boil off of cryogens into the atmosphere associated with a loud roaring noise.
b) may be a release of some cryogenic gasses into the MR room resulting in a drop of temperature and increased pressure.
c) A and C

Answer 12

c) A and C

Question 13

A patient presents with sternal wires in-situ as a result of cardiac bypass surgery three years previous. The sternal wires are a contraindication for scanning. True or False

Answer 13

False

Question 14

Both gadolinium contrast will cause a _________ in T1 and T2 relaxation times of tissues.
a) Increase
b) decrease
c) no change

Answer 14

b) decrease

Question 15

Gadolinium contrast at clinically approved doses are __________ contrast agents
a) ferromagnetic
b) diagmagnetic
c) paramagnetic

Answer 15

c) paramagnetic

Question 16

In clinical doses the resultant change on T1 weighted spin echo images of the tissues affected by the contrast media will be _________ signal intensity
a) decreased
b) increased
c) no change in

Answer 16

b) increased

Question 17

The use of IV contrast media can improve the visibility of small vessels on 3D TOF MR angiography?
a) False
b) True

Answer 17

b) true

Question 18

Gradient magnetic fields are of a safety concern because they ________
a) produce high amounts of RF energy
b) induce current in conductors
c) cause short-term memory loss
d) a and b

Answer 18

b) induce current in conductors

Question 19

The amount of RF power deposited into the body is dependent upon _________
a) the duration of the RF pulse
b) the TE selected
c) the receive bandwidth
d) a and c

Answer 19

a) the duration of the RF pulse

Question 20

Increasing the gradient slew rate can cause an increase probability for ________
a) RF burn injury
b) peripheral nerve stimulation
c) increased tissue heating
d) reduced acoustic noise

Answer 20

b) peripheral nerve stimulation
gradient slew rate = time it takes for GE to achieve max amplitude.

Question 21

Which of the following patients should be monitored using pulse oximetry?
a) patients who are unconscious
b) patients at high risk for contrast reaction
c) patients who do not speak English
d) any/all of the above

Answer 21

d) all of the above

Question 22

Which of the following devices are contraindicated with respects to MRI?
a) metallic intra-ocular foreign body
b) nonferrous intracranial aneurysm clip
c) sternal wires from coronary artery bypass surgery
d) a and b only

Answer 22

a) metallic intra-ocular foreign bodies

Question 23

As the result of the RF absorption an increase in body temperature is ________?
a) rarely detectable
b) greatest on the outside and becoming less at the center
c) greatest at the centre and becoming less on the surface
d) evenly distributed throughout the body.

Answer 23

b) greatest on the outside and becoming less at the centre

Question 24

Which of the following sequences is more likely to result in high SAR?
a) FSE with an ETL of 24
b) FSE with an ETL of 8
c) EPI with an ETL of 128
d) Fast 3D GRE

Answer 24

c) EPI with an ETL of 128

Question 25

Precautions for administration of Gadolinium-based contrast agents include:
a) high creatinine
b) high blood pressure
c) pregnancy and breast feeding
d) no known precautions

Answer 25

b) high blood pressure

Question 26

Which of the following cannot cause a patient burn injury?
a) fiber optic cable
b) surface coil wire
c) EKG electrodes
d) a and b only

Answer 26

a) fiber optic cable

Question 27

MRI contrast is designed to cross and in-tact brain blood barrier. True or false

Answer 27

False, large molecules such as gad cannot cross and intact brain blood barrier.