Tentamen (uitwerkingen)

MRSO FINAL EXAM WITH QUESTIONS AND ANSWERS

Name: MRSO FINAL EXAM WITH QUESTIONS AND ANSWERS
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mrso final exam
mrso final exam with questions and answers
how do magnetic flux lines travel
which of the following can be potential safety concerns to a patient in the

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MRSO FINAL EXAM WITH QUESTIONS AND ANSWERS

How do magnetic flux lines travel?

A. North to South

B. South to North

C. East to West

D. West to East - Answer A North to South

Which of the following can be potential safety concerns to a patient in the static
magnetic field?

A. Electrically conductive materials

B. Ferrous objects

C. Magnetic objects

D. All of the choices. - Answer D. All of the choices

An object that retains its magnetic field when exiting the static magnetic field is
call what?

A. Paramagnetic

B. Diamagnetic

C. Ferromagnetic

D. Superparamagnetic - Answer C. Ferromagnetic

What direction is the vector of a permanent MR unit?

A. Horizontal

B. Vertical

C. Diagonal

D. Variable - Answer B. Vertical

What separates a superconducting MR unit from a resistive MR unit?

A. Cryogen

,B. Coils of wires

C. Permanent magnets

D. none of the choices - Answer A. Cryogen\

The increasing strength of magnetism as we move closer to the MR unit is called
what?

A. Ferromagnetism

B. Spatial magnetic gradient field

C. Vector

D. B0 - Answer B. Spatial magnetic gradient field

What is responsible for attracting ferrous objects into the MR unit?

A. Spatial magnetic gradient fields

B. Strong uniform magnetic fields

C. Gradient coils

D. Radiofrequency system - Answer A. Spatial magnetic gradient fields

If we placed a small ferrous object at isocenter, what would we expect to
happen?

A. The object would experience no attraction.

B. The object would immediately be attracted to the bore.

C. The object would levitate.

D. The object would be repulsed by the unit. - Answer A. The object would
experience no attraction.

Rotational force will be the strongest at what location?

A. Isocenter

B. Outside the MR room

C. At the gantry opening

D. At the 5 gauss line - Answer A. Isocenter

Passive shielding uses which of the following?

,A. Coils of wires with electrical current running through them.

B. Magnetically conductive materials

C. Plastic

D. Wood - Answer B. Magnetically conductive materials

How can we reduce risks associated with Lenz's force?

A. No risks are associated with Lenz's force.

B. Use a cold compress to reduce heating.

C. Move as quickly as possible to get the patient out of the scanner quickly.

D. Advance patient into the scanner slowly. - Answer D. Advance Patient into the
scanner slowly.

An implant has a deflection of 23 degrees. In terms of static magnetic fields, is it
safe for this patient to have an MRI?

A. Yes

B. Must call the manufacture to determine conditions.

C. No

D. Not enough information. - Answer A. Yes

Which of the following stainless steels are non-ferrous?

A. Ferritic

B. Martensitic

C. Austenitic

D. All are ferrous - Answer C. Austenitic

It is not safe for a patient to cross over the 5 gauss line. How many millitesla is
this?

A. 0.5mT

B. 5mT

C. 50mT

D. 0.005mT - Answer A. 0.5mT

, A patient is placed in a magnetic field that changes over a distance from the MR
unit. What do we need in order to meet the manufacture limits if a patient with an
implant will be safe from the threats associated with the static magnetic field
prior to their MRI.

A. Spatial gradient map.

B. Compression

C. The MRSO sole approval.

D. All of the choices. - Answer A. Spatial gradient map

The spatial gradient of 1.5 T MR unit, not the maximum spatial gradient has a
lower spatial gradient than a 3.0 T MR unit.

A. True

B. False - Answer B. False

Which of the following are documented biological effects associated with the
static magnetic field?

A. Magnetophosphenes

B. Magnetohydrodynamic Effect

C. Headaches

D. Difficulty breathing - Answer A. Magnetophosphenes, B.
Magnetohydrodynamic Effect and C. Headaches.

What is the purpose of the time-varying gradient magnetic field?

A. To produce resonance in our hydrogen nuclei

B. To change the precessional speeds of hydrogen

C. To produce net magnetism

D. To form an image. - Answer B. To change the precessional speeds of
hydrogen.

The effect of the time-varying gradient is greatest where?

A. Periphery of the patient.

B. At isocenter

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