Ayla Pitts
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Ultrasound Physics Exam 1

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Ayla Pitts
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Ultrasound Physics Exam 1

Question 1 of 73

1

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

Select one of the following:

  • increases

  • decreases

  • no change

Explanation

Question 2 of 73

1

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 far zone?

Select one of the following:

  • increases

  • decreases

  • no change

Explanation

Question 3 of 73

1

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

Select one of the following:

  • increases

  • decreases

  • no change

Explanation

Question 4 of 73

1

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

Select one of the following:

  • increases

  • decreases

  • no change

Explanation

Question 5 of 73

1

At the location is the sound beam diameter three time greater than the transducer diameter?

Select one of the following:

  • at the end of the near zone

  • at the depth equal to four focal lengths

  • at the end of the far zone

  • at the triple-diameter depth

Explanation

Question 6 of 73

1

What is the shape of a sound beam created by a tiny piece of PZT?

Select one of the following:

  • hourglass shaped

  • V-shaped

  • round

  • shaped like a tube

Explanation

Question 7 of 73

1

Which of the following explains why a sound beam created by a disc-shaped crystal is hourglass-shaped?

Select one of the following:

  • Bernoulli's Principle

  • Sheffield's Law

  • Ohm's Law

  • Huygen's Principle

Explanation

Question 8 of 73

1

Which of the following locations is the deepest?

Select one of the following:

  • end of the fresnel zone

  • end of the focal zone

  • end of the fraunhofer zone

  • end of the near zone

Explanation

Question 9 of 73

1

Which of the following locations is the most shallow?

Select one of the following:

  • beginning of the far zone

  • beginning of the focal zone

  • focal depth

  • beginning of the Fraunhofer zone

Explanation

Question 10 of 73

1

A pair of 6MHz probes are identical excepts for the active element diameter. The active element diameters are 6mm and 10mm. The sound beam of which probe will have a shallower focus?

Select one of the following:

  • 6mm

  • 10mm

Explanation

Question 11 of 73

1

A pair of 9mm diameter probes are identical except for frequency, which is 3MHZ and 6MHz. WHich beam will have shallower focus?

Select one of the following:

  • 3MHz

  • 6MHz

Explanation

Question 12 of 73

1

Which of the following probes creates a beam with the deepest focus?

Select one of the following:

  • 4 mm diameter, 4 MHz

  • 6 mm diameter, 8 MHz

  • 4 mm diameter, 2 MHz

  • 5 mm diameter, 8MHz

Explanation

Question 13 of 73

1

Which of the following probes creates a beam with the shallowest focus?

Select one of the following:

  • 4 mm diameter, 4 MHz

  • 6 mm diameter, 8 MHz

  • 4 mm diameter, 2 MHz

  • 5 mm diameter, 8MHz

Explanation

Question 14 of 73

1

Which of the following probes creates a beam with a the shallowest focus?

Select one of the following:

  • small diameter, high frequency

  • large diameter, high frequency

  • small diameter, low frequency

  • large diameter, low frequency

Explanation

Question 15 of 73

1

Active elements diameter and near zone are directly related?

Select one of the following:

  • True
  • False

Explanation

Question 16 of 73

1

Transducer frequency and near zone length are inversely related.

Select one of the following:

  • True
  • False

Explanation

Question 17 of 73

1

Wavelength and near zone length are inversely related.

Select one of the following:

  • True
  • False

Explanation

Question 18 of 73

1

A pair of 6 MHz probes are identical excepts for the active element diameter, which is 6 mm and 10 mm. Which beam will be more compact in the far field?

Select one of the following:

  • 6 mm

  • 10 mm

Explanation

Question 19 of 73

1

A pair of 9 mm diameter probes are identical except for frequncies, which are 3 MHz and 6MHz. Which sound beam will spread out more in the far field>

Select one of the following:

  • 3 MHz

  • 6 MHz

Explanation

Question 20 of 73

1

Which of the following probes creates a beam with least divergence?

Select one of the following:

  • 4 mm diameter, 4MHz

  • 6 mm diameter, 8MHz

  • 6 mm diameter, 2MHz

  • 5 mm diameter, 8 MHz

Explanation

Question 21 of 73

1

Which of the following probes creates a beam with most divergence?

Select one of the following:

  • 4 mm diameter, 4 MHz

  • 6 mm diameter, 8 MHz

  • 4 mm diameter, 2 MHz

  • 5 mm diameter, 8 MHz

Explanation

Question 22 of 73

1

Which of the following probes create a beam with the most divergence?

Select one of the following:

  • small diameter, high frequency

  • large diamter, high frequency

  • small diameter, low frequency

  • large diameter, low frequency

Explanation

Question 23 of 73

1

Transducer frequency and beam divergence are inversely related

Select one of the following:

  • True
  • False

Explanation

Question 24 of 73

1

Active element diameter and beam divergence are inversely related.

Select one of the following:

  • True
  • False

Explanation

Question 25 of 73

1

Mechanical scanning and linear phased arrays create sector-shaped images

Select one of the following:

  • True
  • False

Explanation

Question 26 of 73

1

Many active elements fire at almost the same time in mechanical scanner.

Select one of the following:

  • True
  • False

Explanation

Question 27 of 73

1

Many active elements fire at almost the same time in a phased array scanner.

Select one of the following:

  • True
  • False

Explanation

Question 28 of 73

1

Which of the following transducers is best described as mechanically steered and fixed, single focused?

Select one of the following:

  • annular phased array

  • annular array

  • mechincal

  • linear phased

Explanation

Question 29 of 73

1

Which of the following is best described as mechanically steered and multi-focus?

Select one of the following:

  • annular phased array

  • annular sequential array transducer

  • mechanical transducer

  • linear phased transducer

Explanation

Question 30 of 73

1

Which of the following transducers creates a rectangular shaped image?

Select one of the following:

  • annular phased array

  • linear sequential array

  • mechanical

  • linear phased

Explanation

Question 31 of 73

1

A linear phased array transducer has 128 crystals. How many of these crystals are fired to create a single sound beam?

Select one of the following:

  • 1

  • a small group

  • a large group

  • 128

Explanation

Question 32 of 73

1

A linear sequential array transducer has 128 crystals. How many of these crystals are fired to create a single sound beam?

Select one of the following:

  • 1

  • a small group

  • 128

  • a large group

Explanation

Question 33 of 73

1

In a linear phased array, what is the firing patten that steers a beam to the left or right?

Select one of the following:

  • electronic slope

  • electronic curvature

Explanation

Question 34 of 73

1

In linear phased arrays, what is the firing pattern that focuses a sound beam?

Select one of the following:

  • electronic slope

  • electonic curvature

Explanation

Question 35 of 73

1

There are large time delays in the firing pattern of a linear phased array transducer.

Select one of the following:

  • True
  • False

Explanation

Question 36 of 73

1

A machine that displays A-mode and Two- dimensional image is called a duplex scanner.

Select one of the following:

  • True
  • False

Explanation

Question 37 of 73

1

A machine that displays a Doppler and two-dimensional images is called a duplex scanner.

Select one of the following:

  • True
  • False

Explanation

Question 38 of 73

1

Which of the following improves elevational resoultion?

Select one of the following:

  • matrix array

  • linear phased array

  • one and one-half dimensional arry

  • two-dimensional array

Explanation

Question 39 of 73

1

Side lobes degrade axial resolution

Select one of the following:

  • True
  • False

Explanation

Question 40 of 73

1

Side lobes degrade lateral resolution

Select one of the following:

  • True
  • False

Explanation

Question 41 of 73

1

Which of the following forms of resolution improve when frame rate increases?

Select one of the following:

  • lateral

  • temporal

  • spatial

  • longitudinal

Explanation

Question 42 of 73

1

Which of the following is consistent with improved temporal resolution?

Select one of the following:

  • color doppler

  • more grey shades

  • more detail

  • high frame rate

Explanation

Question 43 of 73

1

All of the following decrease temporal resolution except?

Select one of the following:

  • lower frame rate

  • deeper imaging

  • multi-focus

  • narrow sector

Explanation

Question 44 of 73

1

A sonographer adjusts an ultrasound scan to double the depth of view from 5 cm to 10 cm. What happens to the frame rate?

Select one of the following:

  • it is halved

  • it doubles

  • it increases from 5 to 10 Hz

  • it is unchanged

Explanation

Question 45 of 73

1

A sonographer adjusts an ultrasound scan to double the depth of view fro 5 cm to 10 cm. If the frame rate remains the same which on of the following also occurs?

Select one of the following:

  • increased line density

  • wider sector

  • multi-focus imaging turned one

  • narrow sector

Explanation

Question 46 of 73

1

A sonographer adjusts an ultrasound machine to change the sector siz for 90 to 45 degrees. Nothing else changes. What happends to the frame rate?

Select one of the following:

  • it is doubled

  • it remains unchaged

  • it is halved

  • it is tripled

Explanation

Question 47 of 73

1

A sonographer adjusts an ultrasound system to change the sector size for 90 to 45 degree. The frame rate was unchanged. What else must have happened?

Select one of the following:

  • temporal resolution was doubled

  • sector size was doubled

  • line density was doubled

  • imaging depth was halved

Explanation

Question 48 of 73

1

A sonographer using a phased array ultrasound system turns off the multi-focus feature. What is the most likely consequence of this action?

Select one of the following:

  • frame rate decreases

  • temporal resolution degrades

  • imaging depth increases

  • temporal resolution improves

Explanation

Question 49 of 73

1

A sonographer increases the line density from 1 line per degree of the sector to 3 lines per degree of the sector. What is the most likely consequence of this action?

Select one of the following:

  • frame rate increases

  • temporal resolution decreases

  • imaging quality decreases

  • temporal resolution increases

Explanation

Question 50 of 73

1

A sonographer reduces the sector angle for 90 degrees to 30 degrees. At the same time, the ultrasound system automatically increases the lines density from 1 line per degree to 2 lines per degree. No other change is made. What will happen to the frame rate?

Select one of the following:

  • increases

  • decreases

  • remains unchanged

Explanation

Question 51 of 73

1

A sonographer reduces the sector angle for 90 degrees to 30 degrees. At the same time, the ultrasound system automatically increases the lines density from 1 line per degree to 3 lines per degree. No other change are made. What will happen to temporal resolution?

Select one of the following:

  • increases

  • decreases

  • remains unchanged

Explanation

Question 52 of 73

1

Which of the following is most important in determinging the frame rate of a system?

Select one of the following:

  • speed of sound in the medium

  • dynamic range of the receiver

  • transducer frequency

  • transmitter output

Explanation

Question 53 of 73

1

Which of the following is most important in determining frame rate of a system?

Select one of the following:

  • depth of view

  • dynamic range of the receiver

  • transducer frequency

  • transmitter output

Explanation

Question 54 of 73

1

What is the frame rate if each image of the ultrasound system is created in 0.02 sec (1/50 sec)

Select one of the following:

  • 20 Hz

  • 100 Hz

  • 50 Hz

  • 16 Hz

Explanation

Question 55 of 73

1

What is the time needed to make a single image if the frame rate of an ultrasound system is 20 Hz?

Select one of the following:

  • 1 s

  • 0.02 s

  • 0.05 s

  • 15 Hz

Explanation

Question 56 of 73

1

The critical factor in determining frame rate, line density, and imaging depth is the tranducer style.

Select one of the following:

  • True
  • False

Explanation

Question 57 of 73

1

The number of lines per frame and the frame rate determine the frequency

Select one of the following:

  • True
  • False

Explanation

Question 58 of 73

1

The number of lines per frame and frame rate determine the PRF

Select one of the following:

  • True
  • False

Explanation

Question 59 of 73

1

If the imaging depth of a scan is 15 cm and there are 100 lines in the image, then the number of pulses making up the scan is 1500.

Select one of the following:

  • True
  • False

Explanation

Question 60 of 73

1

If the imaging depth of a scan is 15 cm and there are 100 lines in the image, then the number of pulses making up the scan is 100.

Select one of the following:

  • True
  • False

Explanation

Question 61 of 73

1

If 100 scan lines make up an image and the frame rate is 30 per second, then the transducer's frequency is 3,000 HZ

Select one of the following:

  • True
  • False

Explanation

Question 62 of 73

1

If 100 scan lines make up an image and the frame rate is 30 per second, then the system's PRF is 3,000 Hz

Select one of the following:

  • True
  • False

Explanation

Question 63 of 73

1

When the frame is 30Hz, how long does it take to create a frame?

Select one of the following:

  • 30 sec

  • 3 sec

  • 0.3 sec

  • 1/30 sec

  • 1/3 sec

Explanation

Question 64 of 73

1

Under certain conditions, an ultrasound system creates imagine in 0.01 seconds. What is the frame rate?

Select one of the following:

  • 1 Hz

  • 10 sec

  • 100 Hz

  • 200 Hz

  • 0.02 Hz

Explanation

Question 65 of 73

1

What is the fundamental limitation of temporal resolution?

Select one of the following:

  • imaging depth

  • speed of sound in the medium

  • line density

  • sector size

Explanation

Question 66 of 73

1

All of the following are components of an ultrasound system except?

Select one of the following:

  • transducer

  • alternator

  • display

  • pulser

  • synchronizer

  • receiver

Explanation

Question 67 of 73

1

This type of pulser generates a constant electrical signal in the form of a sine wave

Select one of the following:

  • pulsed wave, array

  • continous wave

  • pulsed wave, single crystal

Explanation

Question 68 of 73

1

This type of pulser generates a single electrical spike, which ultimately creates a single sound pulse.

Select one of the following:

  • pulse wave, phased array

  • continuous wave

  • pulsed wave, single crystal

Explanation

Question 69 of 73

1

This type of pulser generates numerous electrical spikes, which ultimately create a single sound pulse

Select one of the following:

  • pulsed wave, phase array

  • continous

  • pulsed wave, single crystal

Explanation

Question 70 of 73

1

The acoustic power of the sound beam emitted from a transducer is determined by the ________ of the pules's signal

Select one of the following:

  • PRF

  • Frequnecy

  • voltage

  • rectification

Explanation

Question 71 of 73

1

All of the following functions of the receiver except

Select one of the following:

  • demodulation

  • supression

  • amplification

  • attenutation

Explanation

Question 72 of 73

1

Amplification processes all reflected signals in a similar manner

Select one of the following:

  • True
  • False

Explanation

Question 73 of 73

1

Compensation processes all reflected signals in a similar manner

Select one of the following:

  • True
  • False

Explanation

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