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WorksheetsBiological Effects
Total questions: 10
Worksheet time: 8mins
General ultrasound imaging application usually used transducer between
2 to 15 MHz
15 to 20 MHz
20 to 50 MHz
50 to 100 MHz
Abdominal imaging commonly used
linear probe
curvilinear probe
phased array probe
transracial probe
Rate at which sound energy pass through a unit area is
acoustic power
acoustic impedance
power density
power transmission
Following FDA recommendation, the output power value should be below
10 mW/cm2
100 mW/cm2
1000 mW/cm2
10000 mW/cm2
The temperature rise in a medium is
thermal effect
non-thermal effect
cavitation
micro streaming
Thermal effect decreases with increasing
intensity
exposure time
blood supply
absorption characteristics
The non hazardous temperature rise to human is less than
1 C
1.5 C
2 C
4 C
Temperature rise that can be hazardous to tissue is above
40 C
42 C
45 C
50 C
The recommended TI value is
0.2
0.5
0.7
1.0
The regular expansion and contraction of bubbles due to repeated pressure change is referred to
stable cavitation
unstable cavitation
micro streaming
thermal effect
