MRI Equipment

Question 1

IMPORTANT CHARACTERISTICS FOR AN MRI ROOM

Answer 1

Patient friendly

Secure inner area - 5 Gauss line

Penetration panel

RF shielding

Structural support

Electrical supply

Question 2

MAGNETIC FIELD STRENGTH

Answer 2

In Tesla or Gauss

Higher the Tesla’s strength

The better the signal to noise ratio - improved image quality

And the more image acquisition options

Question 3

PERMANENT MAGNETS

Answer 3

Permanently Magnetised

Operated at room temp

0.7T field strength

Question 4

SUPERCONDUCTING MAGNETS

Answer 4

Operates at 0 degrees

Immersed in liquid helium

Permanently on

0.5-11T field strength

Question 5

WHAT IS A CRYOSTAT?

Answer 5

Large thermos flask made of non ferrous metal

Contains liquid helium

Question 6

WHAT IS THE DIFFERENCE BETWEEN ACTIVE AND PASSIVE SHIELDING

Answer 6

Active shielding has more than 1 electromagnetic coils wound opposite to main magnet coil

Passive shielding consists of ferromagnetic material places outside magnet

Question 7

RF COILS

Answer 7

Antenna of MRI system that sends signal to the patient and receives the return signal.

2 types
Transmitter - receive only
Transceiver - Transmit and receive