Ch. 5 Intensities Flashcards
____________________ refers to distance or space
Spatial refers to distance or space
______________________ refers to “all time, transmit” and receive
Temporal refers to “all time, transmit” and receive
____________________ refers only to the transmit time (pulse duration)
Pulsed refers only to the transmit time (pulse duration)
_____________________________ may be reported in various ways with respect to time and space
Intensities may be reported in various ways with respect to time & space
The different measurements of intensities are important in the study of __________________________
The different measurements of intensities are important in the study of bioeffects
___________________ is the most relevant intensity with respect to tissue heating
SPTA spatial peak, temporal average is the most relevant intensity with respect to tissue heating
The units for all intensities are _________________
The units for all intensities are watts per centimeters squared
Because peak measurements are larger than average measurements ______ intensity has the highest value, and _______ has the lowest value.
Because peak measurements are larger than average measurements SPTP intensity has the highest value, and SATA has the lowest value
For continuous wave ultrasound, the beam is always “on” and the pulse average and temporal average intensities are the same. Thus __________ = SPPA and _____________ = SAPA
SPTA = SPPA and SATA = SAPA
What is the importance of describing sound beam intensities in a variety of ways with regard to space and time?
A. it allows better transducer design
B. it’s important when studying bioeffects
C. it optimizes image quality
D. harmonics can be measured
B. describing the intensity of sound beams as they vary in time and in space is important in the study of bioeffects.
Which intensity is most closely correlated to tissue heating?
A. SPTP
B. SATP
C. SPTA
D. SATA
C. SPTA is the intensity that related most closely to tissue temperature elevation
