Test 2

To receive information for display at a rapid rate, it is desirable to use a ________.

Even unfocused transducers have a natural focus.

The matching layer increases reflection of the transducer element.

Detection is also called demodulation.

Gain is the ratio of __________.

Wide bandwidth allows harmonic imaging.

lateral resolutions remains consistent at any depth

Intravascular imaging generally utilizes a frequency range ________.

lateral resol/2 ution is equal to ____

Which of the following constitutes a reception channel?

A flat-panel display presents image information in the form of ________.

Focusing in the section thickness plane reduces section thickness artifact.

The ________ is the number of sonographic images entered into memory per second.

Which of the following digitally filters, detects, and compresses echo data?

Various formulations of lead zirconate titanate are commonly used in modern day transducers.

Which of the following reformats data into image form for processing, storage, and display?

look at the picture below

Utilizing additional focal points causes the temporal resolution to __________.

How many bits does it take to make a byte?

In a single-element transducer, additional beams not included in the ultrasound beam are called _____________.

Which of the following frequencies is operated by the thinnest element?

Coupling medium is applied to the transducer–tissue boundary to increase _________ of the sound wave.

Linear and convex are types of ________ arrays.

A digitizer _______________

The operating frequency depends on the element propagation speed and thickness

Which of the following is not an advantage of harmonic imaging?

When gain is too high, which of the following occurs?

Human vision is limited to a dynamic range of about 30 dB.

Which of the following describes the far zone?

The averaging of sequential frames together to provide a smoother image appearance is called ________.

Without compensation the ultrasound transducer would cause about ____ of the emitted intensity to be reflected by skin

The distance from the transducer to the center of the focal region is called the ________.

The ________ and ________ determine the maximum imaging depth.

An increase in the number of channels ________.

Which image format is similar to that for convex array except that the footprint is smaller?

The ________ drive(s) the transducer forming the beam that sweeps through the tissue to be imaged.

Multi-Hertz transducers are driven at only one selectable frequency.

you find this lymph node Which sonographic term listed  below is the best to describe it? 

answer question below

image displays the carotid bifurcation. The ECA is most likely

Principle 2 virtual beam forming greatly improves axial/elevational resolution compared to resolutions in Principle 1

Brightness mode is also called ________.

Intensity of the echo information is stored as binary numbers in memory elements.

The pulse repetition frequency (PRF) in real time imaging typically ranges from ________.

in a curved array, the pulses travel ___

Contrast resolution depends on ________ of bits per pixel.

With a linear phased array transducer, the elements measure the width of about ________.

M (motion)-mode is a presentation of echo depth versus time.

Storage of the last several frames acquired before freezing is called ________.

The transducer has an impedance ______ times that of tissue.

Improvements in Principle 2 virtual beam forming include reduced section thickness, which improves _______.

answer question below

Beam width can be reduced by focusing to improve lateral resolution.

Sonographic systems with ______ technology can identify certain normal/abnormal tissue types and label them on the image

Arrays have additional beams resulting from their multi-element structure called ________.

The near-zone length decreases with an increase in frequency.

Temporal resolution in M (motion) and A (amplitude) modes is equal to the pulse repetition period (PRP).

Another name for the Fresnel zone is ________________.

Which system component produces the electrical voltages that drive the transducer?

which system control equalizes amplitude by different reflector depths?

Each independent delay and element combination constitutes a transmission channel.

The dimension perpendicular to the scan plane is called ________.

The ________ is where the action originates.

The useful frequency range for most diagnostic applications is ____________ MHz.

Panoramic imaging expands the image ________.

Which of the following determines the beam width at the focus?

The critical temperature an ultrasound transducer cannot exceed is called the ________.

prop speed of the transducer element material is 6 mm/µs, the operating frequency for a thickness of 0.2 mm is _____ MHz

The conversion of echo voltages from the radio frequency to video form is called ________.

Normally the number of channels does not exceed the number of ________.

Damping material in pulsed transducers increases the spatial pulse length.

The near-zone length is determined by the size and the _________ of the element.

Which of the following operator controls adjusts compression?

The three aspects of imaging resolution include axial, contrast, and temporal resolution.

Maximum amplifier gain is determined by ________.

To avoid echo misplacement ________.

averaging sequential frames improves

Shortening the pulses in diagnostic ultrasound broadens the ______________.

The beam former amplifiers typically have ________ dB of gain.

All of the following are examples of postprocessing except _____.

Axial resolution is the ________.

Increasing the frame rate improves ________.

Filtering of the sound beam is used to eliminate ________.

Pixel interpolation, persistence, and panoramic imaging are examples of ________.

With phasing, the reception beam is ________ and dynamically ________.