ARDMS version A &amp; B

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問題一覧

to which acoustic variable is penetration depth inversely related?

A) frequency

what is dynamic aperture?

C) aperture that increases with increasing focal length

which imaging mode requires a broadband transducer

B) pulse wave Doppler

what is the Doppler shift frequency?

B) difference between the transmitted ultrasound frequency, and the received ultrasound frequency

what is the potential effect of increasing the pulse repetition frequency (PRF)

A) depth ambiguity

what is an advantage of using pulse wave Doppler compared to continuous wave Doppler

B) ability to select sample depth

what affects the beam width in the near field

D) transducer aperture

what is the advantage of using pulse wave Doppler versus continuous wave Doppler?

D) provides depth specificity

which parameter is target group C evaluating based on the image

D) horizontal distance accuracy

in this image which target group is used evaluate dead zone

which ultrasound parameter directly affects an ultrasound beams intensity

C) output power

The center frequency of a transducer depends primarily upon which characteristics of the crystal

D) thickness

which factor limits image frame rate?

A) fat

which term describes the averaging together of scan lines from multiple angles to create one image

D) spatial compounding

which variable can cause an acoustic shadow artifact

A) small acoustic impedance mismatch

what does coded excitation improve in addition to penetration

B) signal to noise ratio

how is lateral resolution determined for a pulse echo system using a tissue mimicking test object

A) by observing spaces between reflectors perpendicular to the beam

which variable caused the color change from blue to red of the vessel in this image

A) change in vessel direction

which artifact is indicated by the arrows in this image

C) comet tail

which control improves the effects of attenuation

D) time gain compensation

which Doppler angle to flow results in the greatest absolute Doppler shift

A) 0°

what term describes blood flow changes in response to respiration

A) phasic

an increase in which parameter will improve the accuracy of velocity measurements with autocorrelation

B) packet size

which harmonic imaging how does echo frequency relate to transmitted frequency

C) twice the transmitted frequency

which change would minimize the artifact observed in this image, assuming the pulse repetition frequency is at its maximum limit

B) adjust the baseline

which parameter is most likely to affect spatial resolution

D) depth of visualization

which imaging modality can provide the most accurate measurement of tumor volume

B) B mode

according to ALARA guidelines which parameter should be minimized

A) transmit power

what is demonstrated in this image produced by a linear ray transducer placed on a uniform tissue mimicking phantom

C) transducer crystals are damaged

what is the distance to the interface if the round-trip time for soundwave is 39 microseconds

3cm

which signals are eliminated by the wall filter in a spectral Doppler display

low frequency, low amplitude

at minimum, what is required when documenting a pathology discovered during an examination

two images demonstrating the same pathology from different scan planes

if the diameter of sound beam is half by focusing what happens to the intensity

increased by two times

which parameters would change on a phantom test if the spatial pulse length were made longer?

A) axial resolution

if the ultrasound machine comes in contact with a patient spotted fluids what should be done?

B) use an approved disinfectant solution to clean it

which parameter is most related to cavitation tissue?

B) pressure

which interface will cause the maximum reflection of the incident sound beam?

B) soft tissue/bone

acoustic enhancement occurs distal to what

D) weakly attenuating structure

as the pressure amplitude of the ultrasound doubles, what happens to the wavelength

D) unchanged

what is the period of a 5 MHz ultrasound wave

B) 0.2 ms

what limits diagnostic application at higher frequency

B) tissue penetration

what is the function of a lens on a transducer?

A) focus the beam

what would improve axial resolution?

D) increase the transducer frequency

what is true of the far field

D) sound beam diverges

what improves lateral resolution?

A) decreasing the beam width

which statement is true for a linear phased array transducer

B) elements are all fired nearly simultaneously

which artifact is commonly seen with cystic masses due to the finite dimensions of the ultrasound beam

D) slice thickness

which technique utilizes frequency modulation of the transmitted pulse to improve signal-to-noise ratio

C) coded excitation

what is varied to implement apodization

A) voltage applied to each element

what will produce no Doppler shift at a receiver?

A) source and receiver moving at the same speed and direction

which mode requires two elements mounted side-by-side

D) continuous wave Doppler

when employing a tissue mimicking phantom the depth at which echoes are no longer detected is an indicator of what

C) sensitivity

what enhances the transmission of ultrasound energy between the transducer and the skin

A) the transducer matching layer

which technique increases the sharpness of high contrast boundaries

A) edge enhancement

which is most appropriate action for the sonographer to take when receiving a verbal order for an exam?

A) deny performance of the exam until a written request is received

which setting of ultrasound system gives the sonographer the ability to display both strong and weak echoes

A) dynamic range

what is the benefit of using contrast agents?

B) increased amplitude of returning Doppler signals

A soundwave propagates fastest through which substance

A) bone

when the focal point in a B mode image is electronically changed which type of focusing is used

C) dynamic

when a fluid is flowing at a slow and constant rate within a long tube having a uniform diameter, what is the nature of the flow?

C) laminar

what causes range ambiguity artifacts

C) PRF too high

What is the round-trip time in soft tissue for an echo from a reflector at depth of 1 cm

C) 13 usec

which variable decreases the number of acoustic lines per frame is increased without changing its maximum depth

B) frame rate

frequency compounding improves image quality by doing what?

C) reducing speckle

What is the most common cause of localized vertical nonuniformity in a real time B mode image

A) improper TGC‘s

what is the cause of the black region in the center of the vessel seen in this image?

C) incident angle

what is increased if the pulse duration is decreased?

C) frame rate

what is the Nyquist limit if a pulse wave Doppler instrument has a pulse repetition frequency of 16 kHz

C) 8 kHz

what caused the color pattern demonstrated in the artery indicated by the arrow in this image

B) aliasing

which adjustment should be made to avoid the aliasing displayed on this spectral Doppler image seen on spectral analysis

D) decrease the transducer frequency

if red blood cells are approaching a 5 MHz Doppler transducer at a speed of 75 cm/s what is the approximate received Ultrasound frequency

C) 5,005 kHz

which condition must be present for refraction to occur

C) difference in tissue prop speed

The thermal index is most affected by which type of interaction between sound and tissue

B) absorption

in an unfocused transducer, which is the region between the transducer face and the point where the beam diverges

C) far field

what is this artifact?

C) reverberation

how do you fix this?

D) increase the color scale

which way is the blood flowing

B) left to right

SPI version A

SPI version A

Karla Alvarez · 66問 · 1年前

SPI version A pt 2

SPI version A pt 2

66問 • 1年前

SPI version B

SPI version B

Karla Alvarez · 67問 · 1年前

SPI version B pt 2

SPI version B pt 2

67問 • 1年前

SPI version C

SPI version C

Karla Alvarez · 61問 · 1年前

SPI version C pt 2

SPI version C pt 2

61問 • 1年前

SPI version D

SPI version D

Karla Alvarez · 61問 · 1年前

SPI version D pt 2

SPI version D pt 2

61問 • 1年前