chapters 7 and 8
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| 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? | show 🗑
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| 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? | show 🗑
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| show | 13 microseconds
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| 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. | show 🗑
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| show | 260 microseconds
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| show | 2500 Hz
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| show | false
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| 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) | show 🗑
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| Axial resolution may also be referred to as... | show 🗑
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| show | less ringing, higher frequency
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| 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? | show 🗑
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| show | false (less pulse= greater quality)
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| 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 | show 🗑
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| show | equal to .80mm
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| 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? | show 🗑
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| How does an ultrasound system determine the location of a reflector? | show 🗑
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| How does time of flight correlate with imaging depths? | show 🗑
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| show | 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
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| how are total distance traveled and reflector depth related? | show 🗑
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| show | directly related, PRP (microseconds)= imaging depth(cm) x 13microseconds/cm
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| show | inversely related, when imaging depth doubles-PRF is halved
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| what is the significance of resolution to the diagnostic process? | show 🗑
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| What question does axial resolution answer? | show 🗑
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| show | 2mm because a shorter axial resolution length indicates shorter pulses and improved image quality.
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Created by:
AshleyLemieux