Exam 1 Chapter 1-4

What is the propagation speed of sound in soft tissue?

1,540 mm/ųs

Convert 1,742 into powers of Ten:

1.742 × 10 to the positive 3 exponent

Which type of interference begins with in- phase wave that form a single wave of greater amplitude than either of its components, resulting in a larger wave?

All of the choices are correct :)

When describing air as a medium, It is considered?

Dense Medium

A Hertz is a unit of measurement representing:

A. Cycle per sec

B. Unit of frequency

C. Transmission and reception of the sound beam

D. All of the choices are correct

All of the choices are correct (D)

According to the image, when the density of the wave increases; the pressure of the wave?

Increases with compression

When you aren’t scanning an abdominal aorta, heart, or kidney. What frequency setting would be optimal?

2.5 MHz

What is the range of audible sound?

20- 20,000 Hz

What is the propagation speed of sound in bone?

3,500 m/sec

When the sound beam hits the fluid, What type of sonographic appearance will this interaction represent?

Anechoic (without echos)

The number 0.00000001.24 converted with scientific notation is equal to:

1.24 × 10 to the negative 7 exponent

When I increase my transducer frequency from 2.0 MHz to 10.0 MHz this:

Decrease the period

In vascular lab need a bilateral lower extremity arterial ultrasound examination performed. Which is the optimal choice for a transducer frequency for this patient?

7.0 MHz

Mr. Smith has a carotid ultrasound ordered a vascular probe has the choices of 5.0 MHz, 7.0 MHz, and 10.0 MHz available. Which is the optimal frequency for performing the superficial carotid scan?

7.0 MHz

Please put the following mediums in order from lowest to fastest propagation speed:

Soft Tissue, Air, Fat, Bone

Air, Fat, Soft Tissue, Bone

Constructive interference begins with which types of waves?

In-Phase Waves

What is the propagation speed of sound and fat?

1,450 m/sec

What is the propagation speed of sound in a medium determined by?

BOTH density and stiffness of the medium

An emaciated (extremely thin) female patient comes into the lab for an echocardiogram. Which of the following transducer choices would be the best choice to reduce shadows and clear the image?

3.0 MHz

According to the piezoelectric effect upon transmission the energy is converted from?

Electrical to Mechanical

Longitudinal waves more in a direction that is _______ to the sound beams main access

Parallel

When density increases, the propagation speed?

Decreases

Sound waves above 20,000 Hz are considered?

Ultrasound

The axial resolution of an image is inversely or indirectly related to the?

Depth penetration

The transducer frequency is inversely or indirectly proportional to the?

Depth penetration

If my frequency setting is at 2.5 MHz this is the same thing as stating:

2.5 Million Hertz

A high frequency transducer is directly related to?

Axial resolution

T/F: The transducer has a high beam divergence (spreading of the sound beams)

False

Frequency and depth penetration are?

Indirectly proportional

Which type of interference begins with out of phase wave?

Destructive interference

Rarefied sound indicates that sound molecules are?

Stretched apart decreasing pressure

The depth penetration of the sound is directly proportional to the?

Period

Choose the selection that demonstrates that propagation speed from the fastest to the slowest, and the following mediums:

Bone, Soft Tissue, Air

An ultrasound of the heart has been ordered on an obese patient. The probe frequencies would be the best choice for this patient?

2.0 MHz

Compressed sound waves are?

Higher than atmospheric pressure

At the frequency setting of 2.o MHz and 2.5 MHz, the technician receives?

Increase depth penetration, decrease axial resolution

At the sound travels through soft tissue at 1540 m/sec. The sound beam continues and then travels through the bone: What consequently happened to the speed of the sound beam?

The speed increases

T/F: When scanning a deep structure, a 2.5 MHz transducer is a better option than utilizing a 7.0 MHz transducer

True

Rarefied sound waves are considered?

Lower than atmosphere pressure

Upon reception of the ultrasound beam, the sound energy is converted:

Mechanical to electrical

The type of waves that occur when their peaks and troughs occur at different times in different locations are termed?

Out of Phase waves

Convert 1,000,000 into powers of 10

1.0 × 10 to the power of sixth exponent

Transverse waves move in a direction that is ____ to the sound beams main axis:

Perpendicular

Infrasound is defined as ?

Less than 20 Hz

Above 20KHz is considered to be which type of sound?

Ultrasound