PTAP 1240- Ultrasound exam with correct answers

PTAP 1240- Ultrasound exam with|\ |\ |\ |\ |\




correct answers |\




ultrasound - CORRECT ANSWERS ✔✔-sound waves with a
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frequency greater than 20,000 hertz |\ |\ |\ |\ |\




-has a thermal/nonthermal effects when applied to the body
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sound waves enter the body and are attenuated by? - CORRECT
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ANSWERS ✔✔-absorption |\




-reflection
-refraction


attenuation - CORRECT ANSWERS ✔✔gradual decrease in
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intensity as ultrasound travels through tissue
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absorption - CORRECT ANSWERS ✔✔-some tissues are capable of
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greater absorption of ultrasound than others
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-tissue and frequency specific
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-higher absorption occurs in tissue with a high collagen rate and
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with higher us frequencies
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ultrasound energy absorption - CORRECT ANSWERS ✔✔best in
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tendon, ligament, fascia joint capsule and scar tissue
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, reflection of a sound wave - CORRECT ANSWERS ✔✔occurs when
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the wave passes between two tissues and a fraction of the wave
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"bounces" back
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refraction - CORRECT ANSWERS ✔✔occurs when the US signal is
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deflected from a straight path and the angle of deflection is away
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from the transducer
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coupling agents - CORRECT ANSWERS ✔✔gel and water
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US parameters - CORRECT ANSWERS ✔✔-effective radiating area
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(ERA) -cm2 |\




-beam nonuniformity ratio (BNR)- ratio
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-intensity- w.cm2 |\




-frequency- MHZ |\




-duty cycle-% |\




effective radiating area (ERA) - CORRECT ANSWERS ✔✔-area of
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the crystal that actually produces sound waves
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-energy is concentrated near the center |\ |\ |\ |\ |\ |\




-era is always smaller than the total size of the transducer head
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beam profile - CORRECT ANSWERS ✔✔-multiple ways to emerge
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from the head |\ |\




-energy diverges as it moves away from the source
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-energy is uniform close to the head (fresnel zone)
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