Def/Formulas- Parameters

Question 1

Time it takes a wave to vibrate a single cycle; from the start of one cycle to the start of the next cycle

Answer 1

Period

Question 2

of particular events that occur in a specific duration of time

Answer 2

Frequency

Question 3

The bigness of a wave

Answer 3

Amplitude

Question 4

Rate at which work is performed or rate of energy transfer; also bigness of wave

Answer 4

Power

Question 5

Concentration of energy in a sound beam

Answer 5

Intensity

Question 6

Distance or length of one complete cycle

Answer 6

Wavelength

Question 7

Rate at which sound wave travels through a medium

Answer 7

Speed

Question 8

The actual time from start of a pulse to the end of that pulse

Answer 8

Pulse duration

Question 9

The time for the start of one pulse to the start of the next pulse

Answer 9

Pulse repetition period

Question 10

Number of pulses that an ultrasound system transmits into the body each second

Answer 10

Pulse repetition frequency

Question 11

Distance that a pulse occupies in a space from the start to the end of a pulse

Answer 11

Spatial pulse length

Question 12

Percentage or fraction of time that the system transmits a pulse

Answer 12

Duty factor

Question 13

Qualities of shallow imaging:

Answer 13

• less listening
• shorter PRP
• higher PRF
• higher duty factor

Question 14

Qualities of Deep Imaging:

Answer 14

• more listening
• longer PRP
• lower PRF
• lower duty factor

Question 15

Formula for intensity

Answer 15

W/cm^2

Power (W)
——————
Area (cm^2)

Question 16

When amplitude is doubled, the intensity is____

Answer 16

Increased 4x

Question 17

Formula for wavelength

Answer 17

1.54 mm or us
————————
Frequency (MHz)

Question 18

Formula for speed

Answer 18

Frequency (Hz) x wavelength (m)

Question 19

Two characteristics that affect speed and sound

Answer 19

Stiffness and density

Question 20

What is the speed of sound traveling through soft tissue?

Answer 20

Avg= 1,540 m/s

Question 21

Formula for pulse duration

Answer 21

of cycles x period (us)

               OR

of cycles/ frequency (MHz)

Question 22

Formula for SPL (spatial pulse length)

Answer 22

of cycles in each pulse x wavelength of each cycle (mm)

Question 23

What is the relationship of pulse repetition period and pulse repetition frequency?

Answer 23

PRP and PRF are inversely related/ reciprocals

PRF= 1/PRP

PRP= 1/PRF

PRP x PRF = 1

Question 24

Formula for duty factor

Answer 24

DF%= Pulse duration/ Pulse rep period (100)