Axial
Axial resolution measures the ability of a system to display two structures that are ________________ to the sound beam
What is Parallel
Lateral resolution is the ability to identify two structures that are ________________ to the beam.
What is side by side or perpendicular
LARRD is the Mnemonic for
What is Axial Resolution
This principle explains the shape of the beam and is based upon in-phase and out-of-phase wavelets interfering with each other
What is Huygens' Principle
In clinical situations, which resolution is better than the other
What is Axial resolution
Two things that create increased axial resolution
What is High frequency, short pulses
Lateral resolution changes when the __________and the ___________ changes.
What is depth and width of the beam
For Axial Resolution, In LARRD the R's stand for what?
What is range and radial
The region from the transducer to the focus
What type of focusing uses a lens positioned in front of the PZT
What is External focusing
The formula for axial resolution is
What is Spatial Pulse Length/2
Lateral resolution is the best at the _____________ of the beam.
What is the focus
LATA is the Mnemonic for
What is Lateral Resolution
The distance from the transducer to the focus
What is the Near Zone Length or Focal Depth
The most common type of fixed focusing
What is internal focusing
The normal range for axial resolution is
0.1 to 1 mm
With a large diameter crystal that lateral resolution is the best in the _______ field.
With lateral resolution, in LATA the T stands for
What is Transverse
A small transducer diameter has a ____________ focal depth than a larger transducer diameter.
The type of focusing that is multiple focus and adjustable
What is Electrical or Phased Array
The following transducer will have the best axial resolution
2Mhz & 4 cycles per pulse
4MHz & 3 cycles per pulse
2MHz & 5 cycles per pulse
4MHz & 2 cycles per pulse
What is 4MHz & 2 cycles per second
A transducer has a beam diameter of 6mm. What is the minimum amount of space apart two reflectors can be to show up as two separate reflectors at the focus?
What is Angular and Azimuthal
Higher frequency sound waves will have a ____________ focal depth and ___________ divergence.
What is longer focal depth and smaller divergence
When a 6mm transducer with a 4cm focus changes to a depth with a 8cm focus, what happens to the axial resolution.