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ultrasound.. physics

chapters 7 and 8

QuestionAnswer
A sound wave is created by a transducer, reflects off an object, and returns to the transducer. The depth of the reflector is 10 cm in soft tissue. What is the go-return time? 130 microseconds
A sound wave is created by a transducer, reflects off an object, and returns to the transducer. The go-return time is 39 microseconds. What is the total distance that the pulse traveled? 6cm
How long does it take for sound to make a round trip to and from the skin's surface to a reflector 1 cm depth in soft tissue? 13 microseconds
One reflector is 5 times deeper than another. The time of flight of sound to the deeper structure is ______the time of flight of the shallower reflector. five times more than
The depth of view is set to 20 cm, What is the PRP? 260 microseconds
When the depth of view is set to 30.8 cm, PRF is ______ 2500 Hz
When the depth of view is shallow, PRP is long (t/f) false
Axial resolution measures the ability of a system to display two structures that are very close together when the structures are perpendicular to the sound beam's main axis. (t/f) false. parallel or front to back
Axial resolution may also be referred to as... LARRD Longitudinal, axial, range, radial, depth
A short pulse is created in what two ways less ringing, higher frequency
Two ultrasound systems produce acoustic pulses. One pulse is 0.4 microseconds in duration and the other is 0.2 microseconds. Which pulse will most likely provide the best lateral resolution? cannot be determined
The more cycles there are in a pulse, the greater the detail that will be visualized in the ultrasound scan.(t/f) false (less pulse= greater quality)
Which transducer has the best axial resolution? A) 2 cycles/pulse, 4 MHz B) 4 cycles/pulse, 4 MHz C) 4 cycles/pulse, 2 MHz D) 2 cycles/pulse, 2 MHz a) 2cycles/pulse, 4MHz
The axial resolution of an imaging system is reported to be .80 mm at the beam's focus. What is the closest estimate of the system's radial resolution at a location that is 6 cm depper than the focus? equal to .80mm
An ultrasounic pulse has a pulse repetition period of 1.2 msec, a spatial pulse length of 2.0 mm and a wavelength of 0.4 mm. What is the axial resolution of the system? 1.0mm
How does an ultrasound system determine the location of a reflector? by measuring time-of-flight (elapsed time from pulse creation to pulse reception)
How does time of flight correlate with imaging depths? for every 13 microseconds= 1cm reflector depth (for every 13 microseconds of go-return time, the object creating the reflection is 1cm deeper in soft tissue
explain why and how the average speed of sound is relevant constant necessary to accurately place reflectors on the screen. ultrasound systems computers are programmed with the average speed of sound in soft tissue. The average speed of sound in soft tissue multiplied by the go-return time divided by 2 gives the depth
how are total distance traveled and reflector depth related? total distance traveled is twice the reflector depth
What is the relationship between PRP and maximum imaging depth? directly related, PRP (microseconds)= imaging depth(cm) x 13microseconds/cm
What is the relationship between PRF and maximum imaging depth? inversely related, when imaging depth doubles-PRF is halved
what is the significance of resolution to the diagnostic process? resolution is the ability to image accurately and the accuracy of an image is the essence of diagnostic sonography
What question does axial resolution answer? "What is the minimum distance that two structures, positioned front to back (or parallel to the sound beam) can be apart and still produce two distinct echoes on an ultrasound image?"
Which is a better axial resolution 2mm or 5mm? 2mm because a shorter axial resolution length indicates shorter pulses and improved image quality.
Created by: AshleyLemieux
 

 



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