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Matching layer

Defined as a layer of material with an acoustic impedance between that of piezoelectric crystal and soft tissue.

Lead zirconate

What is the material of choice for the crystal construction because of higher sensitivity and superior efficiency?

Strain

An indication of ultrasound transmitting capacity

Damping material

What part of the transducer absorbs ultrasound emitted by terminating the ringing of crystal?

To use highfrequency

What is the primary function of ultrasound?

AMode

Which mode displays amplitude spikes of varying heights?

Endocavitary probe

Which probe is typically used for endovaginal examinations?

Appears black

Which of the following is a characteristic of an anechoic structure?

A greater reflection

In AMode, a larger signal amplitude on the screen indicates:

The number

Pulse Repetition Frequency (PRF) is defined as:

It has no memory

A key disadvantage of AMode is:

Brightness Mode

BMode is also known as:

An array of colors

Color Doppler imaging converts blood flow measurements into:

Frequency

The Doppler effect describes the change in __ of sound when Its source is moving.

Detecting

Spectral Doppler Is primarily used for:

Activate

The function of the "Needle/Blopsy Gulde" Is to:

It is less

The primary reason AMode is not used as a standalone imaging mode today is that:

Different transducers

In the context of the ultrasound machine's basic operations, why is it important to "select the appropriate transducer"?

MMode displays

During an echocardiogram, the sonographer uses MMode to trace the motion of a heart valve leaflet. Why is MMode particularly suited for this task compared to a static BMode image?

A solid tumor

A mass is identified on an ultrasound. It has irregular borders, internal echoes, and decreased through transmission. This mass is most likely:

To eliminate

Why is a generous amount of coupling gel used between the transducer and the patient's skin?

Isoechoic

A structure that has echogenicity very similar to the surrounding normal tissue is called:

Black

An anechoic structure appears __ on the screen.

The resistance

Acoustic Impedance (Z) is a measure of:

New Patlent Key

Which key is used to clear previous patlent data to enter new Information?

Review recently

The Cine Loop function allows the user to:

It has a homogeneous

A lymph node is typically described as hypochol relative to the surrounding soft tissue. What does this imply about its internal architecture?

Echo amplitude

In Bmode ultrasonography, what does the brightness of each dot represent?

Color Doppler

Which Doppler technique provides colorcoded information about the direction and velocity of blood flow superimposed on a Bmode image?

Amode

Which ultrasound mode is the oldest and was primarily used in ophthalmology for measuring axial length of the eye?

Mmode

Which of the following modes provides a realtime, twodimensional grayscale image of internal structures?

Amode

Which ultrasound mode displays echoes as vertical spikes along a baseline, with amplitude representing echo strength?

Provides only one-dimensional

What is the MAIN disadvantage of Amode ultrasound in clinical practice?

They may suffer

Which of the following is TRUE about limitations of ultrasound display modes in general?

Realtime

In general, the main clinical advantage of ultrasound display modes is:

It reflects

Why does a hyperechoic structure, like a bone interface, appear bright white on the ultrasound screen?

Excellent temporal

The major advantage of Mmode ultrasound in cardiac imaging is:

Adjust timegain compensation

A sonographer increases the gain to visualize deeper structures. The image becomes brighter, but the noise level also rises. Which adjustment would BEST improve image quality without adding noise?

Reduce transducer

A sonographer wants to improve lateral resolution. Which parameter adjustment is MOST effective?

Improve lateral

The purpose of adjusting the focal zone In ultrasound imaging is to:

It is the region

Which statement BEST describes the focal zone in ultrasound imaging?

Spectral Doppler

Which mode combines Doppler shift information with time, displaying velocity as a waveform?

Transducer

The key element of the ultrasound system that converts electrical energy to mechanical energy is the:

Piezoelectric crystal

Referred to as the heart of the ultrasound transducer is the:

Thickness

The critical dimension of a piezoelectric crystal that determines operating frequency is its:

Higher frequencies

A thinner crystal element will operate at:

Onehalf wavelength

Maximum energy transfer occurs when the thickness of the piezoelectric crystal is:

Damping material

What part of the transducer is constructed in combination of epoxy resin and tungsten powder?

Reduce acoustic

What is the main function of the matching layer?

Impedance matching

Refers to the process of ensuring similar acoustic impedances to allow sound transmission is called: