Diagnostic Imaging

Question 1

Ultrasound

Answer 1

Emitted = Pulse, signal= Echo

Question 2

Frequency+ wavelength are

Answer 2

inversely proportional

Question 3

Wavelength

Answer 3

1 cycle of wave (mm)

Question 4

Frequency

Answer 4

Number of wave cycles per second (Hz)
Higher = higher resolution

Question 5

Speed of wave

Answer 5

Frequency x wavelength

Question 6

Piezoelectric crystals

Answer 6

Mechanical stress to electricity vise versa

Question 7

ultrasound wave Production

Answer 7

Alternating current through electrodes = Crystals oscillate, wave returns

Question 8

Acoustic Impedance (Z)

Answer 8

Denser = harder to move particles = higher
density x speed

Question 9

Difference in Z

Answer 9

Reflection of beam: smaller = Smaller

Question 10

CT

Answer 10

Several X-rays combined using cross sectional slices

Question 11

X- ray

Answer 11

Less dense tissues = penetrate well
Dense tissues = less well
Gives Shadows where poorly penetrated

Question 12

X- ray

Answer 12

Less dense tissues = penetrate well
Dense tissues = less well
Gives Shadows where poorly penetrated

Question 13

MRI data

Answer 13

structure, function, blood vessels, Metabolites

Question 14

MRI needs

Answer 14

Magnetic held + Radio frequency Pulses (RF)

Question 15

NMR Spectroscopy studies?

Answer 15

Metabolism + metabolic changes + identify Proteins

Question 16

Diffusion MRI

Answer 16

Molecular diffusion in tissues