1-5
What is the frame rate if each image of the ultrasound system is created in 25 microseconds?
0.04 MHz
Frame rate and temporal resolution are:
Directly related
What unit of measurement accurately describes temporal resolution?
Hertz
Assume that an ultrasound system creates each image with 90 distinct sound pulses. Each pulse travels to a maximum depth that requires a round trip time of 1/750 second. What is the time needed to make a single frame?
0.12 second
Which of the following is consistent with increased or improved temporal resolution?
More shades of gray
Use of color Doppler
Higher frame rate
Higher Tframe
Higher frame rate
The frame rate is determined by: (select all that apply)
Number of pulses per image
Frequency
Sound's speed in the PZT crystal
Image depth
Number of pulses per image, Frequency, and Image depth
A sonographer adjusts an image to change the sector size from 90 to 45 degrees. Nothing else changes. The frame rate has:
Doubled
Which of the following resolutions is excellent when an ultrasound system produces many frames per second?
Lateral
Longitudinal
Spatial
Temporal
Temporal
Temporal resolution is determined by:
Frame rate
Which of the following sector imaging systems will have the best image detail (spatial) resolution if all other parameters are identical?
An 80-degree sector with 40 pulses/image
A 90-degree sector with 100 pulses/image
A 70-degree sector with 84 pulses/image
A 60-degree sector with 60 pulses/image
A 70-degree sector with 84 pulses/image
An ultrasound machine creates a 60-degree sector image with 1 transmit line for each degree. The sonographer adjusts the image by adding 3 focal points on the image. How many distinct sound pulses are needed to create the image?
180 pulses
All of the following factors determine the number of pulses per image except:
Image depth
Line density
Number of foci
Sector size
Image depth
Select the frame rate characteristic that does not belong.
High line intensity
Wide sector
Multiple focal points
Shallow imaging depth
High line intensity
A sonographer adjusts an ultrasound machine to double the depth of view from 5 cm to 10 cm. If the frame rate remains unchanged, which of the following factors also changed?
Decreased sector angle (narrower sector size)
Decreased temporal resolution
Increased line density
Multi-focus imaging was turned on
Decreased sector angle (narrower sector size)
Using a phased array transducer, a sonographer turns off the multi-focus feature. Which of the following actions occurs?
The Tframe increases
The frame rate decreases
The temporal resolution improves
The imaging depth increases
The temporal resolution improves