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Question 1

What does MRI stand for?

Megahertz Reception Imaging

Magnetic Reversed Imaging

Microscale Refined Imaging

Magnetic Resonance Imaging

Question 2

Which of the following is not an essential element for MR imaging?

Laser

RF pulse

Magnet

Spin nuclei

Question 3

Which statement is not correct?

MRI is performed by placing the body in the strong magnetic field.

RF coils receive radio frequency energy induced by the body.

Gradient coil can also generate radio frequency energy.

Radio frequency energy transmitted to the body causes magnetic resonance.

Question 4

Functional MRI is introduced earlier than the concept of k-space.

Question 5

Which statement about gradient coil is correct?

The X gradient coil is to generate magnetic fields along the Y direction

There are only two gradient coils: X and Y gradient coil.

Varying magnetic field changes the precession speed of protons.

Varying magnetic field can change the size of protons.

Question 6

Which statement is true?

The proton spins that precess at a frequency different from the frequency induced in the transmission coil will receive energy and get excited, which is called magnetic resonance.

When the RF energy is applied to cause magnetic resonance and then turned off, MR signals will be induced and detectable in the receiver RF coil.

High sensitivity to the object is important, so the reception of MR signals is often performed with gradient coil(s) close to the object.

A RF coil modulates the gradient field along spatial X, Y, and Z direction.

Question 7

The magnetic field causes protons to precess at a frequency proportional to the radio frequency energy.

Question 8

Which statement describes MRI magnet correctly?

Magnet field strength of permanent magnet is limited to about 9.4T.

There are no maintenance cost for a superconducting magnet.

Helium for MRI magnet exists in liquid state.

MRIs with field strength greater than 3 Gauss are mostly for research purpose at this point.

Question 9

MRI uses lower frequency range for imaging than optical imaging.

Question 10

Which statement is true?

It is difficult to make a small MRI, so the price is also higher than that of larger MRIs.

It may not be safe for a person to perform MR scan more than 5 times in a year.

You are not allowed to carry your watch into the MR scanner.

Varying magnetic field caused by gradient coils increases the specific absorption rate (SAR).

Question 11

Who discovered nuclear magnetic resonance?

Felix Bloch

Paul C. Lauterbur

Seji Ogawa

Raymond Damadian

Question 12

Which of the following nucleus is most widely used for MRI?

1 H

$^{1}H$

23 N a

$^{23}Na$

19 F

$^{19}F$

13 C

$^{13}C$

Question 13

Which statement is not true?

Magnetic field strength of a 3T MRI is 60000 times as strong as the earth’s magnetic field.

There are 3T human MRIs with permanent magnet.

MRI price increases with field strength and bore size.

MRI with superconducting magnets are broadly used in hospitals.

Question 14

Which statement describes functions of RF coils correctly?

Inducing magnetic resonance of protons

Transmitting the energy to protons

Receiving signals from protons

All above.

Question 15

Which component is to get spatial information in MRI?

Reception RF coil

Gradient coil

Transmission RF coil

Main magnet

Question 16

Brian, who wears braces on his teeth, twisted his ankle. He wants to get MRI exam. He will be surely safe to put his leg into the MRI scanner, as long as his head does not go inside the MRI bore.

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MRI Fundamentals

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