Test
Ultrasound Physics Exam 1
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Preguntas del test (73)
1The frequency of a transducer does not change. If the diameter of the new piezoelectric crystal increase, what happens happens to the near zone length?
- Aincreases
- Bdecreases
- Cno change
2The 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?
- Aincreases
- Bdecreases
- Cno change
3The frequency of a transducer does not change. If the diameter of the new piezoelectric crystals increases, what happens to wavelength?
- Aincreases
- Bdecreases
- Cno change
4The 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?
- Aincreases
- Bdecreases
- Cno change
5At the location is the sound beam diameter three time greater than the transducer diameter?
- Aat the end of the near zone
- Bat the depth equal to four focal lengths
- Cat the end of the far zone
- Dat the triple-diameter depth
6What is the shape of a sound beam created by a tiny piece of PZT?
- Ahourglass shaped
- BV-shaped
- Cround
- Dshaped like a tube
7Which of the following explains why a sound beam created by a disc-shaped crystal is hourglass-shaped?
- ABernoulli's Principle
- BSheffield's Law
- COhm's Law
- DHuygen's Principle
8Which of the following locations is the deepest?
- Aend of the fresnel zone
- Bend of the focal zone
- Cend of the fraunhofer zone
- Dend of the near zone
9Which of the following locations is the most shallow?
- Abeginning of the far zone
- Bbeginning of the focal zone
- Cfocal depth
- Dbeginning of the Fraunhofer zone
10A 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?
- A6mm
- B10mm
11A pair of 9mm diameter probes are identical except for frequency, which is 3MHZ and 6MHz. WHich beam will have shallower focus?
- A3MHz
- B6MHz
12Which of the following probes creates a beam with the deepest focus?
- A4 mm diameter, 4 MHz
- B6 mm diameter, 8 MHz
- C4 mm diameter, 2 MHz
- D5 mm diameter, 8MHz
13Which of the following probes creates a beam with the shallowest focus?
- A4 mm diameter, 4 MHz
- B6 mm diameter, 8 MHz
- C4 mm diameter, 2 MHz
- D5 mm diameter, 8MHz
14Which of the following probes creates a beam with a the shallowest focus?
- Asmall diameter, high frequency
- Blarge diameter, high frequency
- Csmall diameter, low frequency
- Dlarge diameter, low frequency
15Active elements diameter and near zone are directly related?
- AVerdadero
- BFalso
16Transducer frequency and near zone length are inversely related.
- AVerdadero
- BFalso
17Wavelength and near zone length are inversely related.
- AVerdadero
- BFalso
18A 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?
- A6 mm
- B10 mm
19A 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>
- A3 MHz
- B6 MHz
20Which of the following probes creates a beam with least divergence?
- A4 mm diameter, 4MHz
- B6 mm diameter, 8MHz
- C6 mm diameter, 2MHz
- D5 mm diameter, 8 MHz
21Which of the following probes creates a beam with most divergence?
- A4 mm diameter, 4 MHz
- B6 mm diameter, 8 MHz
- C4 mm diameter, 2 MHz
- D5 mm diameter, 8 MHz
22Which of the following probes create a beam with the most divergence?
- Asmall diameter, high frequency
- Blarge diamter, high frequency
- Csmall diameter, low frequency
- Dlarge diameter, low frequency
23Transducer frequency and beam divergence are inversely related
- AVerdadero
- BFalso
24Active element diameter and beam divergence are inversely related.
- AVerdadero
- BFalso
25Mechanical scanning and linear phased arrays create sector-shaped images
- AVerdadero
- BFalso
26Many active elements fire at almost the same time in mechanical scanner.
- AVerdadero
- BFalso
27Many active elements fire at almost the same time in a phased array scanner.
- AVerdadero
- BFalso
28Which of the following transducers is best described as mechanically steered and fixed, single focused?
- Aannular phased array
- Bannular array
- Cmechincal
- Dlinear phased
29Which of the following is best described as mechanically steered and multi-focus?
- Aannular phased array
- Bannular sequential array transducer
- Cmechanical transducer
- Dlinear phased transducer
30Which of the following transducers creates a rectangular shaped image?
- Aannular phased array
- Blinear sequential array
- Cmechanical
- Dlinear phased
31A linear phased array transducer has 128 crystals. How many of these crystals are fired to create a single sound beam?
- A1
- Ba small group
- Ca large group
- D128
32A linear sequential array transducer has 128 crystals. How many of these crystals are fired to create a single sound beam?
- A1
- Ba small group
- C128
- Da large group
33In a linear phased array, what is the firing patten that steers a beam to the left or right?
- Aelectronic slope
- Belectronic curvature
34In linear phased arrays, what is the firing pattern that focuses a sound beam?
- Aelectronic slope
- Belectonic curvature
35There are large time delays in the firing pattern of a linear phased array transducer.
- AVerdadero
- BFalso
36A machine that displays A-mode and Two- dimensional image is called a duplex scanner.
- AVerdadero
- BFalso
37A machine that displays a Doppler and two-dimensional images is called a duplex scanner.
- AVerdadero
- BFalso
38Which of the following improves elevational resoultion?
- Amatrix array
- Blinear phased array
- Cone and one-half dimensional arry
- Dtwo-dimensional array
39Side lobes degrade axial resolution
- AVerdadero
- BFalso
40Side lobes degrade lateral resolution
- AVerdadero
- BFalso
41Which of the following forms of resolution improve when frame rate increases?
- Alateral
- Btemporal
- Cspatial
- Dlongitudinal
42Which of the following is consistent with improved temporal resolution?
- Acolor doppler
- Bmore grey shades
- Cmore detail
- Dhigh frame rate
43All of the following decrease temporal resolution except?
- Alower frame rate
- Bdeeper imaging
- Cmulti-focus
- Dnarrow sector
44A sonographer adjusts an ultrasound scan to double the depth of view from 5 cm to 10 cm. What happens to the frame rate?
- Ait is halved
- Bit doubles
- Cit increases from 5 to 10 Hz
- Dit is unchanged
45A 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?
- Aincreased line density
- Bwider sector
- Cmulti-focus imaging turned one
- Dnarrow sector
46A sonographer adjusts an ultrasound machine to change the sector siz for 90 to 45 degrees. Nothing else changes. What happends to the frame rate?
- Ait is doubled
- Bit remains unchaged
- Cit is halved
- Dit is tripled
47A 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?
- Atemporal resolution was doubled
- Bsector size was doubled
- Cline density was doubled
- Dimaging depth was halved
48A sonographer using a phased array ultrasound system turns off the multi-focus feature. What is the most likely consequence of this action?
- Aframe rate decreases
- Btemporal resolution degrades
- Cimaging depth increases
- Dtemporal resolution improves
49A 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?
- Aframe rate increases
- Btemporal resolution decreases
- Cimaging quality decreases
- Dtemporal resolution increases
50A 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?
- Aincreases
- Bdecreases
- Cremains unchanged
51A 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?
- Aincreases
- Bdecreases
- Cremains unchanged
52Which of the following is most important in determinging the frame rate of a system?
- Aspeed of sound in the medium
- Bdynamic range of the receiver
- Ctransducer frequency
- Dtransmitter output
53Which of the following is most important in determining frame rate of a system?
- Adepth of view
- Bdynamic range of the receiver
- Ctransducer frequency
- Dtransmitter output
54What is the frame rate if each image of the ultrasound system is created in 0.02 sec (1/50 sec)
- A20 Hz
- B100 Hz
- C50 Hz
- D16 Hz
55What is the time needed to make a single image if the frame rate of an ultrasound system is 20 Hz?
- A1 s
- B0.02 s
- C0.05 s
- D15 Hz
56The critical factor in determining frame rate, line density, and imaging depth is the tranducer style.
- AVerdadero
- BFalso
57The number of lines per frame and the frame rate determine the frequency
- AVerdadero
- BFalso
58The number of lines per frame and frame rate determine the PRF
- AVerdadero
- BFalso
59If 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.
- AVerdadero
- BFalso
60If 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.
- AVerdadero
- BFalso
61If 100 scan lines make up an image and the frame rate is 30 per second, then the transducer's frequency is 3,000 HZ
- AVerdadero
- BFalso
62If 100 scan lines make up an image and the frame rate is 30 per second, then the system's PRF is 3,000 Hz
- AVerdadero
- BFalso
63When the frame is 30Hz, how long does it take to create a frame?
- A30 sec
- B3 sec
- C0.3 sec
- D1/30 sec
- E1/3 sec
64Under certain conditions, an ultrasound system creates imagine in 0.01 seconds. What is the frame rate?
- A1 Hz
- B10 sec
- C100 Hz
- D200 Hz
- E0.02 Hz
65What is the fundamental limitation of temporal resolution?
- Aimaging depth
- Bspeed of sound in the medium
- Cline density
- Dsector size
66All of the following are components of an ultrasound system except?
- Atransducer
- Balternator
- Cdisplay
- Dpulser
- Esynchronizer
- Freceiver
67This type of pulser generates a constant electrical signal in the form of a sine wave
- Apulsed wave, array
- Bcontinous wave
- Cpulsed wave, single crystal
68This type of pulser generates a single electrical spike, which ultimately creates a single sound pulse.
- Apulse wave, phased array
- Bcontinuous wave
- Cpulsed wave, single crystal
69This type of pulser generates numerous electrical spikes, which ultimately create a single sound pulse
- Apulsed wave, phase array
- Bcontinous
- Cpulsed wave, single crystal
70The acoustic power of the sound beam emitted from a transducer is determined by the ________ of the pules's signal
- APRF
- BFrequnecy
- Cvoltage
- Drectification
71All of the following functions of the receiver except
- Ademodulation
- Bsupression
- Camplification
- Dattenutation
72Amplification processes all reflected signals in a similar manner
- AVerdadero
- BFalso
73Compensation processes all reflected signals in a similar manner
- AVerdadero
- BFalso
Información
- Descripción
- Ultrasound Physics Exam 1
- Autor
- Ayla Pitts
- Idioma
- English
- Visitas
- 76
- Valoración
- Aún sin valoraciones Valora este test