Ultrasound Probes
Decreases penetration
What is increasing frequency
Continuing to loose energy as the ultrasound waves pass through tissues.
What is attenuation.
What is depth
Nearest part of the near field where no image interpretation should be done.
What is the dead zone
Refers to material that produces a blacker image on the screen.
What is echolucent
Frequency of probe for interrogating deep structures
Created when tissue presents some resistance to the ultrasound wave
What is gray
This is the strength of the signal returning to the probe.
What is gain
Shadow-like image that seems to project from the edges of a curved structure.
What is refraction artifact
Far Field
What represents that part of the body furthest from the probe
This is what far field represents when the probe is longitudinal, on posterier axillary line.
What is medial
Reflects 100% of ultrasound waves presenting a very white image
Bones
Magnifies an image for better resolution
What is decreasing depth
Ultrasound's path blocked causing black path behind the object causing the block.
What is shadow artifact or accoustic shadow
Something that is whiter or brighter than tissue around it
What is hyperechoic
This is what near field represents when probe is transverse with the indicator towards the pateint's right.
What is anterior
Contained fluid
Fluid surrounded by a regular echogenic membrane
Decreasing this will help improve ability to see echoic or hyperechoic objects.
What is gain
Ultrasound waves travel through an area of low resistence cause the tissue on the far side to glow more brightly than the tissues beside them.
What is enhancement artifact
Solid organs allowing ultrasound waves to penetrate deep into the body without interference.
What is an accoustic window.
Ability to distinguish two objects on top of each other.
What is axial resolution
Scatter
Deflection of ultrasound wave due to gas or probe not at 90 degree angle to structure being interrogated
Increasing helps distinguish between 2 objects at the same level, side by side.
What is focus (lateral resolution)
Turning down the gain will limit this artifict
Fluid is an example of this type of material
What is anechoic