MRI

Question 1

Whats an MRI?

Answer 1

A scanner showing you the anatomy and function of an organ.

Question 2

How is an MRI made up?

Answer 2

The magnetic field comes from tons of wires in the bit surrounding the body. Inside the main field is a RF transmitter ‘body coil’ which is the main part transmittingradiowavesinto the patients.

The gradient coils can be switched off or on as wanted to show different parts of the body.

Question 3

What is the net magnification?

Answer 3

total sums of the protons when someone is placed in the MRI and this is what you measure.

Question 4

How does all the parts of an MRI work - how do you measure net magnification - this is known as the pulse sequence?

Answer 4

Main magentic feild - makes the equilibrium new magnetization

RF transmitter - excites the protons by knocking it away from equilibrium

Gradient feilds - spatially encodes the signal

RF receiver - listens for the signal coming back

Question 5

Can you put coils at specific areas to sequence?

Answer 5

Yes

Question 6

What do long (bright) and short (Dark) T1’s measure?

Answer 6

Fat

Question 7

What do long (bright) and short (Dark) T2’s measure?

Answer 7

Water

Question 8

Can you take a tissue and manipulate the image to see only fat or only water?

Answer 8

Yes

Question 9

What contrast agent can be added to increase brightness and what would this measure?

Answer 9

Gandonese (this is toxic) and if water comes near it T1 and T2 will change - can measure blood flow, blood volume and permeability

Question 10

What will adding mangonese show you?

Answer 10

This can be taken up into cells instead of calcium and so you can see how the heart is working etc. Can compare how a healthy heart and one having had an MI works