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Exam (elaborations)

2024 ARDMS- SPI EXAM WITH CORRECT ANSWERS

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  • ARDMS- SPI

2024 ARDMS- SPI EXAM WITH CORRECT ANSWERS

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  • November 3, 2024
  • 40
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • a num
  • ARDMS- SPI
  • ARDMS- SPI
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Elitaa
2024 ARDMS- SPI EXAM WITH
CORRECT ANSWERS


The horizontal axis, or x-axis - CORRECT-ANSWERSRuns side to side

The vertical axis, or y-axis - CORRECT-ANSWERSRuns up and down

Unrelated - CORRECT-ANSWERSTwo items that are not associated

Name the 4 synonyms for axial resolution. - CORRECT-ANSWERSlongitudinal,
range, radial, depth resolution

Name the 3 synonyms for lateral resolution. - CORRECT-ANSWERSangular,
azimuthal resolution, and transverse

The length of a pulse is 8 mm. What is the minimum distance between two
reflectors, positioned one in front of the other, that still produces two echoes
on our image? - CORRECT-ANSWERS4 mm (one half the pulse length!)

The frequency of a transducer does not change. If the diameter of the new
piezoelectric crystal increases, what happens to the near zone length? -
CORRECT-ANSWERSincreases

The frequency of a transducer does not change. If the diameter of the new
piezoelectric crystal increases, what happens tot he beam diameter in the far
zone? - CORRECT-ANSWERSdecreases

The frequency of a transducer does not change. If the diameter of the new
piezoelectric crystal increases, what happens to the wavelength? - CORRECT-
ANSWERSno change

The frequency of a transducer does not change. If the diameter of the new
piezoelectric crystal increases, what happens to the beam diameter in the
near zone? - CORRECT-ANSWERSincreases

Narrow beams improve... - CORRECT-ANSWERSlateral resolution

What is A-mode? - CORRECT-ANSWERSAmplitude, series of upward spikes.
(the higher the returning spike, the higher the amplitude) X-axis of a-mode is
depth

,A-modes are accurate in determining _______________. - CORRECT-
ANSWERSthe depth of reflectors

What is B-mode? - CORRECT-ANSWERSBrightness, the brightness of the once
invisible dot indicates the strength of the reflection. (weak reflections appear
as darker gray dots, strong reflections are white dots) X-axis is depth

What was the form form of grayscale imaging? - CORRECT-ANSWERSB-Mode

What is M-mode? - CORRECT-ANSWERSMotion, horizontal wavy lines
represent the changing depth of the reflecting surfaces are produced on the
paper. X-axis = time, Y-axis = depth

What is M-mode primarily used for? - CORRECT-ANSWERSassess the motion
of cardiac walls and structures

What is the only display mode that provides information regarding reflector
motion with respect to time? - CORRECT-ANSWERSM-mode

With A-mode, what does the X-axis display? - CORRECT-ANSWERSdepth of
the reflector

With M-mode, what does the Y-axis display? - CORRECT-ANSWERSdepth of
the reflector

Which mode provides the foundation for real-time, grayscale anatomic
imaging? - CORRECT-ANSWERSB-mode, or brightness mode

With A-mode, what does the Y-axis display? - CORRECT-ANSWERSamplitude
of the reflected signal

In M-mode, what does the X-axis display? - CORRECT-ANSWERStime

With B-mode Which axis is related to the strength of the reflection? -
CORRECT-ANSWERSthe z-axis

How does an ultrasound system create high quality, two-dimensional
images? - CORRECT-ANSWERSTwo characteristics of sound that make it
difficult to create two-dimensional images are: sound travels only in a
straight line, and sound beams must be narrow to optimize lateral resolution.
The use of multiple pulses to create a two-dimensional image overcomes
both of these difficulties.

In a mechanical transducer, the PZT crystal is _______________ to create the
image. - CORRECT-ANSWERSphysically moved

,Mechanical transducer image shape: - CORRECT-ANSWERSfan or sector-
shaped

Mechanical transducers have a _________ focal depth. - CORRECT-
ANSWERSfixed

When there is any damage done to the crystal in a mechanical transducer, -
CORRECT-ANSWERSthe entire image is lost

Array transducers are comprised of... - CORRECT-ANSWERSa single slab of
PZT cut into a collection of separate pieces called elements. Each active
element is connected by a wire to its own electronic circuitry int he
ultrasound system.

The linear phased array has ___ moving parts. And the beam is steered and
focused using an electrical techniques called _________. - CORRECT-
ANSWERSno, phasing

What is the image shape created by a phased array? - CORRECT-
ANSWERSfan or sector-shaped

Elements of a phased array are what shape? - CORRECT-
ANSWERSrectangular and narrow

Sound beams are focused ___________ with linear phased array transducers. -
CORRECT-ANSWERSelectronically

Advantage of phased array systems is: - CORRECT-ANSWERSthe availability
of electronically controlled, adjustable focusing, which allows the
sonographer to match the beam's characteristics to the clinical
circumstances.

Damage to one of the elements of a phased array transducer results in... -
CORRECT-ANSWERSinconsistent or erratic beam steering and focusing.

How many elements in a phased array probe are excited to create a single
sound pulse? - CORRECT-ANSWERSAll the active elements in a linear phased
array probe are fired to create each sound beam.

What is the beam former? - CORRECT-ANSWERSthe electronics within the
ultrasound system that create the voltages to the transducer element

When the spike line is straight, an ____________ is created. - CORRECT-
ANSWERSunfocused sound beam

, How does the pattern of electrical spikes from the beam former focus the
sound beam during transmission? - CORRECT-ANSWERSWhen the outer
crystals are excited earlier than the inner crystals, the curved pattern
creates a focused sound beam. This means the beam will be directed
straight ahead.

Brightness of the display is affected by? - CORRECT-ANSWERSReceiver
amplification (gain)

Acoustic speckle is an artifact produced by what? - CORRECT-
ANSWERSinterference of tiny acoustic wavelets

Side lobe artifact is a result of what condition? - CORRECT-ANSWERSAcoustic
energy radiating in a direction different than the main axis of the beam


Related or Proportional - CORRECT-ANSWERSTwo items that are associated
or affiliated
However, the relationship between the items does not have to be specified

Directly related or Directly proportional - CORRECT-ANSWERSTwo items that
are associated such that when one item increases, the other increases

Inversely related or inversely proportional - CORRECT-ANSWERSTwo items
are associated such that when one item increases, the other decreases

Reciprocal Relationship - CORRECT-ANSWERSWhen two numbers with a
reciprocal relationship are multiplied together, the result is one
Reciprocal numbers are inverse because when one increases, the other
decreases

For a numerical answer to a question to be comprehensive, it requires a -
CORRECT-ANSWERSUnit

"Increase by a factor" means - CORRECT-ANSWERSTo multiply by that
number

"Decrease by a factor" means - CORRECT-ANSWERSTo divide by that number

Scientific or engineering notation is a shorthand manner to represent what
types of numbers? - CORRECT-ANSWERSVery large or very small numbers

A number in scientific notation form with a positive exponent has a value -
CORRECT-ANSWERSGreater than 10

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