SPI review Flashcards Preview

DMSO Physics 2 > SPI review > Flashcards

Flashcards in SPI review Deck (48)
Loading flashcards...
1

typical values for period

0.06-0.5 micro sec

2

typical values of frequency

2-15 MHz

3

Amplitude can have units of:

pascals, grams/cm^3, cm, dB

4

typical values for intensity

.001-100 watts/cm^2

5

typical value for wavelength

0.1-0.8mm

6

typical values for propagation speed

1500-1600 m/s

7

equation for wavelength

wavelength (mm)= 1.54 (mm/micro sec)/ frequency (MHz)

8

typical values for pulse duration

.5-3 micro sec

2-4 cycles

9

pulse duration=

cycles in pulse x period

10

typical values for PRP

100 micro sec to 1 msec

11

typical values of PRF

1000 to 10000 Hz

12

typical value of duty factor

0.1 % to 1 %

.001 to .01

13

Duty factor =

pulse duration/ PRP

14

What typ of imaging has high PRF, high duty factor, and short PRP?

shallow

15

typical values of spatial pulse length

0.1 to 1 mm

16

spatial pulse length=

number of cycles x wavelength

17

what type of imaging has low PRF, low duty factor, and long PRP?

deep

18

intensity most relevent to tissue heating?

SPTA

19

decibles have what type of scale?

relative

20

units for attenuation coefficient

dB/cm

21

attenuation coefficient in soft tissue

.5 dB/cm/MHz

22

impedance is ______ not _________.

calculated, not measured

23

typical values for impedance

1,250,000 and 1,750,000 rayls

24

refraction requires?

oblique incidence and different speeds

25

snells law

sine (transmission angle)=prop speed 2

_______________________________

sine (incident angle)=prop speed 1

26

A property of certain materials to create a voltage when pressure is applied?

piezoelectric effect

27

Q factor =

resonant freq/bandwidth

28

axial resolution equation in soft tissue

.77 x # cycles in pulse/ freq

29

A-mode

xaxis: depth

yaxis: amplitude

30

B-mode

xaxis: depth

zaxis: brightness