ovel quiz

Pixel interpolation is an imaging technique with the purpose of

Allocating amplitude to missed reflections

Which imaging display commonly utilizes pixel interpolation

Sector imaging

If the frame rate increases in the pulse repetition, frequency is unchanged the

Line density will decrease

How many frames per second are typically used in real time imaging

30 to 60

In order to image deeper structures, the ultrasound system must

Decrease the number of pulses per second

Which of the following resolutions inversely relates to the number of focal zones and lines per frame

Temporal

Which of the following will degrade temporal resolution?

Increasing the scan line density

Which of the following units measures amplification of the returning signals

dB

Scan lines are aimed in a variety of pathways when utilizing

Spatial compounding

Which of the following statements, accurately describes harmonic frequencies

Harmonic frequencies generate in the highest intensity of the sound beam

The size of the displayed image is direct directly related to

Pulse repetition frequency

Which of the following image artifacts is caused by refraction

Edge shadowing

In bright mode, the X axis represents the

Right or left aspect of the body

Which of the following controls should the sonographer change to improve the detail in the posterior liver?

focal zone

Three dimensional imaging requires volume data at rates up to

30 volumes/ second

Gain compensation is necessary due to

attenuation of the sound beam

What is a type of grayscale artifact?

comet tail, and posterior acoustic shadowing

What statement would best describe spatial compounding

It improves visualization beneath highly attenuating structures

When dimensional display presenting the depth of a reflection in the vertical axis, and the strength of the returning signal in the horizontal axis is

A mode

apodization is a function of what instrument

Beam former

What resolution diminishes with pulse inversion

Temporal

Which of the following operator controls uses frame averaging

Persistence

What would be a kind of attenuation artifact?

Posterior acoustic enhancement

The number of pixels per inch is inversely proportional to the

Pixel size

Utilizing previous echo reflections, while adding new echoes to the image along the parallel scanning plane describes

Panoramic imaging

Gain is defined as the ratio of

Amplifier output to input of electric power

Which of the following reflectors will likely cause a mirror image art

Pleura

Which of the following controls, the amplitude of the transmitted and receive signals

Output power

Increasing the number of focal zones

Increase lateral resolution

Which of the following are even harmonics of a 2 MHz operating frequency

4,6,8

Increasing the frame rate will

Decrease the maximum imaging depth

Propagation speed error

May cause a break in the tissue scanned because of the propagation speed change

individual signal paths for reception and transmission of the sound beam are termed

Channels

Which of the following components and structures the ultrasound system to send a signal to the transducer

master synchronizer

echo texture equal to the surrounding structures, best describes, which of the following sonographic terms

Isoechoic

Three dimensional imaging is accomplished by

Acquiring many parallel, two dimensional images

The output of an ultrasound system determines the

Amplitude of the transmitted sound beam

averaging frames that will view anatomy from different angles describes

Spatial compounding

Human vision is limited to a dynamic range of approximately

20 dB

Which of the following imaging techniques utilizes pulse inversion

Harmonic imaging

Electronic beam steering in an array assembly is accomplished by the

Beam former

what display mode allows for evaluation of the motion, pattern, and moving structures

M mode

Increasing voltages received from the transducer to a level suitable for processing denotes

Amplification

Placement of an echo is determined by the propagation speed of the reflector and

Round-trip time

Normally the number of channels utilized does not exceed the number of

Transducer elements