Exam 1 review

Question 1

small particles
protons

electrons

Answer 1

Quantum physics

Question 2

large particles

molecules

Answer 2

classic physics

Question 3

Gyromagnetic ratio

magnet field strength

Answer 3

determines precessional freq

Question 4

spin spin relaxation

time for 63% loss in transverse plane

Answer 4

T2 decay

Question 5

flips longitudinal magnetization into the transverse plane

puts atoms in phase

Answer 5

RF pulse ON

Question 6

FID occurs—

The Longitudinal recovery occurs and returns to equilibrium.

—Transverse decay occurs at the same time but is independent.

—A signal is induced in our coil (electrical signal measured in coulombsand this signal is called Free induction decay. The signal is from the patients tissues (hydrogen atoms)that have been excited

Answer 6

RF pulse OFF

Question 7

42.57 Mhz per Tesla

Answer 7

gyromagnetic ratio

Question 8

RF energy

Electromagnetic energy

Answer 8

energy used for MRI

Question 9

sum of Protons in Nucleus

Answer 9

Atomic Number

Question 10

sum of Protons and Neutrons in the nucleus

Answer 10

Atomic Mass

Question 11

return to the longitudinal plane

Answer 11

thermal equalibrium

Question 12

any plane other than Mz (longitudinal)

Answer 12

Mxy

Question 13

consists of north and South pole

Answer 13

basic magnet

Question 14

when does a person become a magnet

Answer 14

when they are in the bore

Question 15

What TE controls

Answer 15

T@

Question 16

direction of the North and South axis of a Magnet and the amplitude of the magnetic field

Answer 16

magnetic moment

Question 17

Battle between Spin Up and Spin Down Nuclei create a common ground. The result of this battle is the

Answer 17

N.M.V. w0

Net Magnetization Vector

Question 18

These are the winners or the remaining Vectors that now align with the external field…

These are what will be manipulated by the external R.F. pulse to create M.R.I images.

Answer 18

Net Magnetization Vectors

Question 19

What TR controls

Answer 19

T1