Unit 1-2

Question 1

Giga

Answer 1

One Billion

Question 2

Mega

Answer 2

One Million

Question 3

Micro

Answer 3

One Millionth

Question 4

Milli

Answer 4

One thousandth

Question 5

Kilo

Answer 5

One thousand

Question 6

Centi

Answer 6

One hundredth

Question 7

Decibels

Answer 7

Measures output, dynamic range and gain

Question 8

Pulse duration formula

Answer 8

Period X numbers of cycles

Question 9

Intensity formula

Answer 9

Power divided by area

Question 10

Duty Factor formula

Answer 10

Pulse Duration Divided by Pulse Rep. Period, Times 100.

Question 11

What is the wave equation?

Answer 11

Prop. speed divided by frequency.

Question 12

What are the 3 acoustic variables?

Answer 12

Pressure
Density
Distance

Question 13

In which way do particles of a transverse wave move?

Answer 13

Perpendicular

Question 14

In which way do particles of a longitudinal wave move?

Answer 14

Parallel

Question 15

What does frequency affect?

Answer 15

Penetration

Question 16

Where does the aorta begin?

Answer 16

Left Ventricle of the heart

Question 17

The aorta ends by,_____.

Answer 17

Splitting into two iliac arteries.

Question 18

What is the range for audible sound?

Answer 18

20-20,000Hz

Question 19

What is the range for infrasound?

Answer 19

Less than 20 Hz

Question 20

What is the range for ultrasound?

Answer 20

Greater than 20,000 Hz

Question 21

What is the range for diagnostic imagaing?

Answer 21

2-12 MHz

Question 22

What are compressions?

Answer 22

Areas of high pressure and density.

Question 23

What are areas of low pressure and density called?

Answer 23

Rarefactions

Question 24

What is the distance of one complete cycle called?

Answer 24

Wave length

Question 25

What are the 5 pulsing charatrics?

Answer 25

PRP,PRF,PD, SPL, DF

Question 26

On- time is when the machine is?

Answer 26

Sending out pulses

Question 27

Off-time is when the machine is?

Answer 27

Listening back from pulses sent

Question 28

What is the number of pulses per second called?

Answer 28

Pulse Rep. Frquency

Question 29

The typical value of pulse rep. frequency ranges from ___ to___.

Answer 29

1,000-10,000 Hz

Question 30

In clinical imaging, duty factor ranges from ___ to ___.

Answer 30

0.2% to 0.5%

Question 31

Use complementary units: Seconds and _____.

Answer 31

Hertz (Hz)

Question 32

Use complementary units: milliseconds and _____.

Answer 32

Kilohertz (KHz)

Question 33

If imaging depth increases, the duty factor will _______.

Answer 33

Decrease

Question 34

If depth increase, the pulse repetition will _____.

Answer 34

Decrease

Question 35

If double the frequency, the wave length will be ______.

Answer 35

Half

Question 36

If wave length increases, the SPL will_____.

Answer 36

Increase

Question 37

If frequency increases, the wave length will _____.

Answer 37

Decrease

Question 38

Period increases as the _____ decreases.

Answer 38

Frequency

Question 39

When power increases, the ____ will decrease.

Answer 39

Frequency

Question 40

An increase in depth is a _______ in off-time.

Answer 40

Increase

Question 40

An increase in off-time, is an increase in _____.

Answer 40

Pulse rep. Period

Question 41

What are the seven wave parameters?

Answer 41

Power Frequency Amplitude Power Intensity Wave length Propagation Speed

Question 42

Power is equal to?

Answer 42

Amplitude squared

Question 43

Use ___ frequency for deeper imaging.

Answer 43

lower

Question 44

Use___ frequency for superficial imaging.

Answer 44

Higher

Question 45

What is the propagation speed for soft tissue?

Answer 45

1,540 or 1.54mm

Question 46

What is the propagation speed of bone?

Answer 46

3,500 or 3.5mm

Question 47

What is the propagation speed determined by?

Answer 47

Stiffness and Density

Question 48

In imaging, depth can affect _____,_____, and _____.

Answer 48

Duty factor, Pulse Repetition Period, and Pulse Repetition Frequency.

Question 49

What is the SPL formula?

Answer 49

Wave length X Number of Cycles.

Question 50

What is axial resolution?

Answer 50

How clear an image is