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Shadowing is unrelated to propagation speed

Front

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Last updated

4 years ago

Date created

Mar 14, 2020

Cards (35)

Section 1

(35 cards)

Shadowing is unrelated to propagation speed

Front

PACS systems are most likely to be digital, not analog

Back

Mechanical Index is inversely related to frequency and directly related to amplitude

Front

The Transducer exposes patients to the greatest risk

Back

Spatial resolution, or image detail, is determined by the number of pixels per inch

Front

While supine, the hydro static pressure at the ankle is 0 since the ankle and heart are at the same level

Back

With a monitor, spatial resolution is determined by the number of lines per frame

Front

The presence of backing material reduces a transducers sensitivity

Back

Lateral resolution changes with depth on a single image

Front

Epidemiological studies should be randomized and prospective

Back

Doppler shift is directly proportional to transducer frequency

Front

Pulse repetition determines imaging depth

Back

Some artifacts (including slice thickness) are created when the beam dimension is greater than that of the reflector

Front

Maximum number of shades of gray = 2^n

Back

Quality Assurance

Front

Should be performed routinely

Back

Depth Calibration

Front

accuracy of reflector depth position on an A-mode, B-mode, or M-mode display

Back

In a digital image, many bits per pixel provides many shades of gray

Front

Non-linear behavior creates both tissue and contrast harmonices

Back

Analog to digital conversion occurs just prior to storage of the image information in the digital scan converter

Front

Compensation is used primarily to make an image of uniform brightness from top to bottom

Back

Longer PRP = Deep Imaging

Front

The impedance of the matching layer should be in between that of the active element and the skin

Back

Display Depth

Front

Greatest influence on Pulse Repetition Period (PRP)

Back

Lower frequency sound has a shallower focus

Front

Small diameter crystals have a shallower focus

Back

Vector array transducer

Front

electronic steering, electronic focusing, trapezoidal shaped image

Back

Fast Fourier Transform (FFT)

Front

Used for spectral analysis for both pulsed and continuous wave Doppler

Back

Larger diameter crystals produce sound beams with deeper foci, as a result, the SPTA intensity will be lowest with the larger diameter crystal

Front

Narrow dynamic range = few choices

Back

Annular Arrays

Front

Multi-focus; diminished temporal resolution, but improved lateral resolution

Back

Refraction

Front

Occurs only with oblique incidence and when the two media on either side of the boundary have different speeds

Back

Near Field

Front

with an unfocused transducer, the area from the face of the transducer to where the beam diverges

Back

Compensation

Front

Receiver function used to create similar brightness reflections from identical reflectors positioned at different depths in the body

Back

In a real time scanner, depth of view determines the maximum frame rate

Front

High frequency sound generally creates short pulses that attenuate a great deal

Back

Rayleigh Scattering

Front

Component of attenuation related to frequency raised to the fourth power

Back

Continuous wave transducers are generally narrow bandwidth

Front

Short path length and lower frequency will minimize attenuation

Back

Mirror image artifact appears at a deeper depth than the true reflector

Front

Harmful bio-effects are commonly observed in normal cavitation

Back

The mechanical index predicts cavitation

Front

Higher mechanical indices are found with high peak rarefaction pressures and lower frequencies

Back

Color Doppler Gain settings have the greatest influence upon color jet size

Front

With brightness mode, echo amplitude is input into the z-axis

Back

-3 dB means intensity is reduced to one-half of its original value

Front

Shadowing is related to attenuation

Back

Pressure is lowest at the point of maximum narrowing within a stenosis

Front

Pulse Duration is unrelated to depth

Back

Increasing the transducer frequency decreases the ability to accurately measure high velocity flow

Front

The beam former creates the time delays that steer the sound beam

Back

Sound beams are less divergent when they are created by high frequency, large diameter crystals

Front

Dynamic aperture is a form of receive focusing

Back

Frequency is inversely related to PZT crystal thickness and directly related to propagation speed

Front

Alterations in output power change the signal-to-noise ratio of an echo

Back

Decreased beam diameter improves lateral resolution

Front

Increasing the transmit frequency decreases the ability to accurately measure high velocity flow

Back

The presence of backing material reduces a transducer's sensitivity

Front

While standing, the hydro-static pressure at the ankle is about 100 mmHg

Back

Axial Resolution Artifact

Front

2 reflectors positioned one in front of the other appears as one reflection of the image

Back