Chapters 1-4 and 8

Question 0

A change in one is always accompanied by a change in another.
(directly proportional)

Answer 0

Related or Proportional

Question 1

A change in one is always accompanied by a change in the other.

Answer 1

Directly Proportional

Question 2

One variable increases while the other decreases.

Answer 2

Inversely Proportional

Question 3

A mutual interchange between two variables.

Answer 3

Reciprocal Relationship

Question 4

potential biologic consequences due to the interaction between the ultrasound wave and the scanned tissue

Answer 4

Biologic Effects

Question 5

Concentration of force

Answer 5

Pressure

Question 6

Concentraion of mass or weight

Answer 6

Density

Question 7

Measure of particle motion.

Answer 7

Distance

Question 8

Molecules vibrate at 90 degrees to the direction of energy level.

Answer 8

Transverse Wave

Question 9

Molecules vibrate in the same direction as the energy travels.

Answer 9

Longitudinal Wave

Question 10

Two waves are paired such that maximum displacements occur at the same time and so reinforce.

Answer 10

In-Phase Wave

Question 11

Two waves interfere and cancel eachother out, producing the out wave that has no wave length or amplitude

Answer 11

Out-of-Phase wave

Question 12

adding two waves together to get a resulting wave that is bigger than the beginning wave.

Answer 12

Constructive Interference

Question 13

When the sum of two waves is less than or equal to zero.

Answer 13

Destructive Interference

Question 14

transducer

Answer 14

Source

Question 15

An intervening substance through which something else is transmitted or carried on.

Answer 15

Medium

Question 16

The time of the cycle

Answer 16

Period

Question 17

Number of cycles per second that a periodic event or function undergoes.
Number of cycles completed per unit of time.

Answer 17

Frequency

Question 18

Strength of an ultrasound wave measured in decibels

Answer 18

Amplitude

Question 19

Rate of energy flow over the entire beam of sound.

Rate at which energy is transmitted.

Answer 19

power

Question 20

Power per unit area

Answer 20

Intensity

Question 21

Distance over which a wave repeats itself during one period of oscillation.

Answer 21

Wavelength

Question 22

The speed at which the cycles travel.

Answer 22

Propagation Speed

Question 23

the concentration of matter.

Answer 23

Density

Question 24

The resistance of material to compression

Answer 24

Stiffness

Question 25

A collection of cycles that travel together.

Answer 25

Pulsed Sound

Question 26

The time intercal required for generating the transmitted pulse.

Answer 26

Pulse Duration

Question 27

The distance a pulse occupies in space

Answer 27

Spatial Pulse Length

Question 28

the time from the start of one pulse to the start of the next pulse.

Answer 28

Pulse Repitition Period

Question 29

In pulse-echo instruments, the number of pulses launched per second by the transducer.

Answer 29

Pulse Repetition Frequency

Question 30

Percentage of time that the system is trasnmitting a pulse.

Answer 30

Duty Factor

Question 31

The length or distance that an entire pulse occupies in space.

Answer 31

Spatial

Question 32

The highest or maximum point of anything.

Answer 32

Peak

Question 33

typical amount, rate, degree... | quantity intermediate to a set of quantities.

Answer 33

Average

Question 34

Ability of the system to accurately depict motion

Answer 34

Temporal

Question 35

In continuous wave ultrasound cycles repeat continuously.

Answer 35

Pulsed

Question 36

Unit used to quantitatively express the ratio of two amplitudes or intensities

Answer 36

Decibel (dB)

Question 37

Reduction in the amplitude and intensity of a sound wave as it propagates through a medium.

Answer 37

Attenuation

Question 38

reflection on either smooth or rough surfaces.

Answer 38

Reflection-Specular & Diffuse

Question 39

The process in which electromagnetic radiation or particles are deflected or diffused.

Answer 39

Scattering

Question 40

elastic scattering of light or other electromagnetic radiation by particles much smaller than the wavelength of the radiation.

Answer 40

Rayleigh Scattering

Question 41

a reduction of the intensity of any form of radiated energy as a result of energy conversion in a medium.

Answer 41

Absorption

Question 42

The fraction of an incident beam of photons that is absorbed or scattered per unit of thickness.

Answer 42

Attenuation Coefficient

Question 43

thickness of the material at which the intensity of radiation entering is reduced by one half.

Answer 43

Half Value Layer Thickness

Question 44

the effective resistance of an electric circuit or component to alternating current.

Answer 44

Impedance

Question 45

condition in which a wave-front is parallel to an interface

Answer 45

Normal Incidence

Question 46

The reflectivity of an interface between two media when the direction of propagation of the incident electromagnetic radiation is not perpendicular to the interface.

Answer 46

Oblique Incidence

Question 47

Change in the direction of propagation of a sound wave transmitted across an interface where the speed of sound varies.

Answer 47

Refraction

Question 48

the relationship between the angles of incidence and refraction for a wave impinging on an interface between two media with two different incidices.

Answer 48

Snell's Law

Question 49

an equation used to solve the range of projectile motion.

Answer 49

Range Equation

Question 50

For every 13 microseconds, the object creating the reflection is 1 cm deeper in soft tissue.

Answer 50

13 Microsecond Rule

Question 51

A measure of a materials resistance to the propagation of sounds

Answer 51

Acoustic Propagation Properties