chapters 7 and 8
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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| show | 6cm
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| 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? | show 🗑
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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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| show | cannot be determined
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| The more cycles there are in a pulse, the greater the detail that will be visualized in the ultrasound scan.(t/f) | show 🗑
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| show | a) 2cycles/pulse, 4MHz
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| show | equal to .80mm
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| show | 1.0mm
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| How does an ultrasound system determine the location of a reflector? | show 🗑
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| show | 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
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| explain why and how the average speed of sound is relevant constant necessary to accurately place reflectors on the screen. | show 🗑
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| how are total distance traveled and reflector depth related? | show 🗑
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| What is the relationship between PRP and maximum imaging depth? | show 🗑
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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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| Which is a better axial resolution 2mm or 5mm? | show 🗑
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