Knobology
This should be placed at or just below the level of interrogation for optimal resolution.
What is focal zone?
A term that describes tissue that has an ultrasound appearance that is brighter than surrounding tissues.
The muscular layer of an artery
What is tunica media?
Main site of nutrient exchange
What are capillary beds?
Considered the most accurate approach when measuring diameter of the aorta
What is anterior to posterior?
This adjusts the size of a waveform or color range, and is also referred to as PRF.
What is scale?
This plane divides the body into front and back sections
What is the coronal plane?
Regulators controlling capillary flow
What are arterioles?
Unique anatomical display found primarily in the veins of the upper extremities and distal lower extremities
What are paired veins?
Most common site of abdominal aortic aneurysm
Part of the ultrasound board used to adjust size and/or location of active modes, like color box size, cursor placement, etc.
What is the trackball?
The type of frequency best for visualizing deep structures
What is low frequency?
Vertebral arteries merge to become this vessel, providing vital inflow to the brain
What is basilar artery?
Shape of vein with low resistance to flow
What is circular?
The celiac trunk gives rise to the splenic artery, the hepatic artery, and this smaller artery
What is the left gastric artery?
This form of Doppler sends out sound and then waits before sending again; best for focal sampling.
What is pulsed wave Doppler?
occurs when Nyquist limit is exceeded
What is aliasing?
This type of artery typically supplies organs and maintains constant forward flow
What is a low resistance artery?
weight of a column of blood
What is hydrostatic pressure?
An abdominal aorta dimension of >2cm and <3cm
What is ectasia?
Adjusts overall brightness; useful for 2D, color, spectral, and M-mode.
What is gain?
Doppler shifts toward the probe are reflected here
What is above the baseline?
Greatest factor impacting flow resistance in a vessel
What is radius?
The respiratory cycle that decreases abdominal pressure, opening IVC and allowing for increased LE venous flow
What is expiration?
Usually visualized between the aorta and SMA in transverse
What is the left renal vein?