SPI version D pt 2

61問 • 1ヶ月前

問題一覧

if a sound beam moves from air into soft tissue at an angle of 60° what is the angle of reflection?

C) 60°

You switch from a 5 MHz curved probe to a 2.5 MHz sector probe to image deeper in the abdomen how is the wavelength affected by the change to the new probe

C) doubles

even and odd harmonic frequencies are created by

D) non linear sound wave propagation

if more cycles are added to a pulse which of the following resolution is degraded

C) axial

why can’t ultrasound probes be thermally sterilized

C) if the probe is heated above the curie point the piezoelectric properties will be lost

The doppler tracing of the flow in a vessel 1 cm distal to a stenosis will demonstrate ___ than at the stenosis

A) greater bandwidth

when scanning using harmonic imaging the second harmonic frequency is 10 MHz. what is the fundamental frequency

B) 5 Mhz

when transmural pressure in a vein is high

D) the vein becomes enlarged and rounded

for each transducer shown there is an U/S image produced. when comparing the two, which of the following statements is true regarding the image produced by the transducer on the right ?

B) the image will show improved spatial resolution

which of the following should be increased when evaluating venous flow on doppler

A) color priority

which of the following correctly describes an amplifier

A) each returning reflection is made stronger/ larger for additional processing and storage

what system parameter is being assessed on the phantom image

D) depth calibration

the primary advantage of continuous wave doppler is

D) absence of the Nyquist limit

which of the following exams does not require angle corrected doppler evaluation

D) IVC duplex

if the transmitted frequency is 5 MHz and the reflected frequency is 4.9975 MHz how will the doppler shift be displayed

D) under the baseline

which of the following is a complication of series stenosis in an artery

D) velocity and stenosis can be underestimated at the second stenosis

You noticed the cord of the echo transducer is slightly separated from the back of the probe which of the following describes the appropriate action to take next

D) place a service call for the probe and reschedule all patients until it is repaired

If you use a tissue phantom that contains a substance with an average propagation speed of 1600 cm/s to evaluate a standard ultrasound system, how this affect the depth calibration testing

C) reflectors will be more shallow than they actually are located within the phantom

which of the following correctly, describes the negative predictive value (NPV) of a testing technique

C) if the test is negative NPV is the probability that the patient does not have the disease

what type of precautions is required for a patient with MRSA

D) contact precautions

If the Space between the dotted lines indicates a total time of 0.5 seconds what is the frequency of the sound transmission?

A) 4 Hz

Which of the following ultrasound machine controls affects the power of the beam

B) transmit gain

Potential bioeffects of ultrasound can be minimized by which of the following

C) minimizing dwell time

According to the attached color map, what color will demonstrate for laminar flow that is moving away from the probe at 35 cm/s

B) blue

Which system control will simultaneously enhanced far field echoes and diminished near field echoes

C) time gain compensation

The use of multiple focal zones will improve ___ but degrade ___

C) lateral resolution, temporal resolution

Which of the following is not necessary in construction of a cavitated micromachine ultrasound transducer

A) matching layer

Curved PE elements and acoustic lenses will improve which two types of resolution

A) elevational and lateral

Which of the following should be activated to create a smoother appearance to the image

D) persistence

Patient can revoke consent from any invasive procedure

A) at any time for any reason

Blooming artifacts occurs

D) when color obscures the gray scale display of soft plaque because the resolution of color Doppler is lower than the gray scale

What part of the ultrasound system is responsible for changing the element function back-and-forth from transmit to receive

B) beam former

Increasing the rejection or suppression setting can be used to

A) increase the contrast of the image to produce a more black-and-white image

The entire image is too bright. What console adjustments should you make first

D) decrease the output power

What system settings should be adjusted to better visualize a possible stone in the ureter posterior to the bladder

A) turn off spatial compounding

If the PRF is set to the maximum level, how can the artifact be corrected

D) utilize CW

What artifact is produced by the interference of reflected waves from many tiny reflectors

D) speckle

As the transducer frequency increases the quality factor ___

D) increases

Which of the following is not part of the sonographer responsibilities for an ultrasound exam?

B) offering advice on ways to alleviate symptoms until the doctor treats the problem treats the problem

Lower the Tx frequency will

A) increase the mechanical index

Which of the following will improve signal to noise ratio of the image

B) increasing output power

What is the best way to determine if a displayed structure is real or an image artifact when scanning

D) use multiple imaging windows to evaluate the area

Which of the following describes a vector array transducer

D) has a sector shaped field of view with a flat top

What type of probe is preferred for cardiac imaging

B) phased sector

Which of the following describes power Doppler

D) color is assigned to the Doppler shift based on the number of moving red blood cells

____ is the term used to describe the concentric layers of blood flow within a normal vessel

D) laminar flow

Harmonic imaging leads to

C) decreased image clutter

A linear transducer providing a trapezoidal image demonstrates degraded ___ resolution in the far field of the image

B) lateral

Which of the following will increase the duty factor of the pulse ultrasound probe

A) decreasing the image depth

Which of the following will increase the amount of color displayed in a vessel located deep in the body

D) increased frame rate

What console setting can be changed to adjust the propagation speed of the transmitted wave

D) none of the above

Which of the following is the most likely explanation for findings displayed on the image

A) the deeper vessel is a mirror image artifact caused by the Apex of lung

Steering the color sample box will cause changes in the

A) Doppler shift and angle of insonation

Adjust you to the following parameters will correct the Doppler artifact displayed

C) change to lower frequency probe

What is the best way to visualize a suspected mass that is isoechoic to surrounding tissues?

A) minimize the dynamic range to 60-65 dB

which of the following is true regarding continuous wave transducer structure and function

A) CW probes do not require any backing material

if the data line indicates a time of one second from the start of wave transmission, what is the frequency of the sound transmission

D) 4 Hz

as a soundwave travels through soft tissue what happens to the period of the wave

C) remains constant

spatial resolution is:

D) the minimum reflector separation required to produce separate echoes

the coupling gel use for ultrasound exams provides the same function as what transducer component

C) matching layer

____ is defined as the ratio of two sound intensities

C) decibel

YT1 Materials Engineer EXAM

ユーザ名非公開 · 100問 · 1ヶ月前

YT1 Materials Engineer EXAM