Quiz_________________?
Acoustic Impedance -
the change in a tissue characteristic that creates the acoustic interface. It is specific to each
type of tissue
density x velocity
Quiz_________________?
Acoustic Interfaces -
Answer✅
are reflecting boundaries formed by changes in the tissue characteristics (where two
mediums meet)
Quiz_________________?
Acoustic Interference -
1
, Answer✅
when two or more wavelets are produced at the same time. Their amplitudes at any time
can be combined to determine their combined effect.
Quiz_________________?
air impedance -
Answer✅
very strong
100%
Quiz_________________?
Amplitude -
Answer✅
measurement of the relative intensity of the sound. Measured from baseline to peak or
baseline to trough
Quiz_________________?
An increase in damping will: -
Answer✅
decrease the transducer's sensitivity, decrease the number of cycles and increase the
bandwidth
Quiz_________________?
Apodization -
Answer✅
2
, a technique that applies separate voltages to the array elements changing the relative power
from the individual elements to reduce the intensity of the grating lobes.
Quiz_________________?
Bandwidth -
Answer✅
the range of frequencies the ultrasound pulse contains (ie a 5 MHz transducer with a
bandwidth of 4 will contain frequencies between 3 MHz and 7 MHz)
Quiz_________________?
bone/calcified plaque impedance -
Answer✅
medium
50%
Quiz_________________?
Cycles in a pulse vs frequency -
Answer✅
The number of cycles in a pulse is not the same as the frequency. The frequency is the
cycles per unit of time that the transducer would produce if operating continuously. Since
we use pulse wave transducers we must consider the number of cycles in a pulse
Quiz_________________?
Damping affects -
Answer✅
the number of cycles in a pulse
3
Acoustic Impedance -
the change in a tissue characteristic that creates the acoustic interface. It is specific to each
type of tissue
density x velocity
Quiz_________________?
Acoustic Interfaces -
Answer✅
are reflecting boundaries formed by changes in the tissue characteristics (where two
mediums meet)
Quiz_________________?
Acoustic Interference -
1
, Answer✅
when two or more wavelets are produced at the same time. Their amplitudes at any time
can be combined to determine their combined effect.
Quiz_________________?
air impedance -
Answer✅
very strong
100%
Quiz_________________?
Amplitude -
Answer✅
measurement of the relative intensity of the sound. Measured from baseline to peak or
baseline to trough
Quiz_________________?
An increase in damping will: -
Answer✅
decrease the transducer's sensitivity, decrease the number of cycles and increase the
bandwidth
Quiz_________________?
Apodization -
Answer✅
2
, a technique that applies separate voltages to the array elements changing the relative power
from the individual elements to reduce the intensity of the grating lobes.
Quiz_________________?
Bandwidth -
Answer✅
the range of frequencies the ultrasound pulse contains (ie a 5 MHz transducer with a
bandwidth of 4 will contain frequencies between 3 MHz and 7 MHz)
Quiz_________________?
bone/calcified plaque impedance -
Answer✅
medium
50%
Quiz_________________?
Cycles in a pulse vs frequency -
Answer✅
The number of cycles in a pulse is not the same as the frequency. The frequency is the
cycles per unit of time that the transducer would produce if operating continuously. Since
we use pulse wave transducers we must consider the number of cycles in a pulse
Quiz_________________?
Damping affects -
Answer✅
the number of cycles in a pulse
3
