Magnetic Resonance Imaging

Question 1

List the 4 components of an MRI Scanner

Answer 1

-Superconducting Magnet
-Table
-Gradient Coils
-Radiofrequency Coils

Question 2

What is measured in Teslas (T)?

Answer 2

The strength of the MRI scanner

Question 3

How many Gauss (G) is equivalent to 1T?
A. 10,000G
B. 1,000G
C. 1G

Answer 3

A. 10,000G

Question 4

What are the 3 planes that gradient coils produce anatomical slices in?

Answer 4

Axial, Sagittal and Coronal

Question 5

True or False?
The magnetic field of a superconducting magnet is caused by magnetic pulse traveling through a coil of wire that is cooled down by liquid Hydrogen.

Answer 5

False.
The magnetic field is caused by an ELECTRICAL CHARGE traveling through a coil of wire that is cooled down by liquid HELIUM.

Question 6

What determines the slice thickness and image quality produced by radiofrequency coils?

Answer 6

The range selected

Question 7

What MRI scanners are used mainly in hospitals

Answer 7

1.5T and 3T

Question 8

What are the 3 principles of operation?

Answer 8

-Hydrogen is the most abundant atom in the human body
-The Hydrogen nucleus contains a single proton which has useful magnetic properties
-The magnetic moment of Hydrogen does not produce a magnetic effect because the nuclei are randomly oriented

Question 9

Where are 7T MRI scanners used?

Answer 9

In some research departments

Question 10

What is the purpose of the table in an MRI scanner?

Answer 10

To move vertically and horizontally to position the patient

Question 11

True or False?
The laser on an MRI table is centred on the anatomical landmark that would be positioned at the isocentre.

Answer 11

True

Question 12

Which of the following is the Earth’s magnetic field?
A. 0.00005T
B. 0.5G

Answer 12

Both, A & B