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ultrasound. physics

chapter 5

QuestionAnswer
What is the highest intensity? SPTP
Intensities are important in the study of? biological effects
Which intensity is important in the study of bioeffects? SPTA
Currently, the AIUM states that no biologic effects are confirmed. The AIUM uses what intensity for a focused beam? <1 W/cm sq.
The thermal index is related to? tissue heating
What is the intensity suggested by the AIUM for an unfocused beam? <100 mW/cm sq.
What is directly related to intensities? duty factor
Which is the lowest intensity? SATA
Is The intensity of the beam the same throughout the beam? no
If power remains the same and area is increased, what happens to the intensity? it decreases
If power is increased and the area is decreased, what happens to the intensity? it increases
What best describes the intensity of a continuous wave beam? the beam is uniform across time but not across space
temporal all time (transmit and receive)
pulsed only transmit time
spatial refers to distance or space
What is the unit for measuring intensity? W/cm squared
What are the appropriate knobology adjustments? (ALARA) overall gain, TGC, then power output
Rank the intensities from lowest to highest SATA, SPTA, SPPA, 1m, SPTP
Created by: AshleyLemieux
 

 



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