Unit 1 Vocab

Question 1

atoms

Answer 1

a tiny element that is the basis for all things

Question 2

angular momentum

Answer 2

the spin of MR active nuclei which depends on the balance between the number of protons and neutrons in the nucleus

Question 3

atomic number

Answer 3

sum of the protons in the nucleus-this number gives an atom its chemical identity

Question 4

Bo

Answer 4

magnetic field strength of the magnet

Question 5

Decay

Answer 5

loss of transverse magnetization

Question 6

Echo Time (TE)

Answer 6

time in milliseconds from the application of the RF pulse to the peak of the signal induced in the coil

Question 7

electrons

Answer 7

particles that spin around the nucleus

Question 8

excitation

Answer 8

application of an RF pulse that causes resonance to occur

Question 9

flip angle

Answer 9

the angle of the NMV to the Bo

Question 10

Free Induction Decay (FID)

Answer 10

loss of signal due to relaxation

Question 11

Frequency

Answer 11

number of cycles or sound waves per second measured in Hertz (H)

Question 12

Gyro-magnetic ratio

Answer 12

the precessional frequency of an element at 1.0 T

Question 13

In phase (coherent)

Answer 13

magnetic moments that are in the same place on the precessional path around Bo at any given moment

Question 14

Ions

Answer 14

atoms with an excess or deficit of electrons

Question 15

Isotope

Answer 15

atoms with an odd mass number

Question 16

Larmor frequency

Answer 16

the rate of precession under the influence of a magnetic field