Pulse Waves
These are the units typically used in Pulse Duration
Microseconds
This stops extra vibration quickly
Damping
This is the area in a sound beam gives the best image
Focal Point
The remaining duty factor of a CW is what?
100 percent
The ability to distinguish twoo structures lying close together front-to-back or parallel to the sound beam is called
longitudinal axial range radial depth resolution
Pulse duration can be adjusted by the sonographer True or False
False
Ultrasound convert what types of energy?
Electric and Ultrasound
This increases by a factor of 2 as the frequency doubles
NZL
This equation leads to the duty factor
Duty Factor (DF) = (Pulse Duration (PD) / Pulse Repetition Period (PRP)) x 100%
This principle leads a sound beam created by a disc shaped crystal to a hourglass shape
Huygens' Principle
The remaining duty factor of a CW is what?
100 percent
The thickness of the crystal does what
It determines the thickness of the crytsal
This is used for deeper imaging
Curved Sequence Array
the measurement of time from the beginning of the first pulse, the waiting period, and until the next interval.
PRP
When imaging depth is halved this is also halved
PRP
This is the range of frequencies in a wave
Bandwidth
The near field can be increased by tranducer
diameter
The beam width is equal to this
Lateral resolution
This how many times there are pulses in a second which is explained in Hz.
PRF
What happens when a PZT crystal's temperature is elevated above the curie point?
When PZT temperature exceeds the curie point the PZT is depolarized. The crystal PZT properties are lost forever and the transducer is ruined
Increase to depth in Ultrasound leads to
A decrease to PRF(Pulse Repetition Frequency)
Dividing a normal crystal into smaller elements
Subdicing
Structures lying perpendicular to the sound beams main axis
Lateral Resolution
This interference leads to a larger sound wave
constructive
If a new pulsed transducer has many more cycles in its pulse the image accuracy does what?
Degrades