Ch. 13 (Real Time Imaging) Flashcards
what is real-time imaging
frames displayed in rapid sequence
illusion of motion
what is static scanning
series of images to create a picture (antique)
ability to accurately image structures
resolution
ability to create numerous frames per second
frame rate
what is frame rate determined by
speed and depth
units of frame rate
Hz
how is frame rate related to time for one frame (t frame)
inversely
reciprocals
can frame rate be changed by the sonographer?
yes
what affects frame rate? or how can we adjust it on the US system?
depth and pulses per frame
ability to precisely position moving structures from instant to instant
(accuracy in time)
temporal resolution
temporal = time
temporal resolution is determined by
frame rate
units of temporal resolution
Hz
how is temporal resolution related to frame rate
directly
system settings that determine frame rate
depth # of pulses in each picture
relationship between imaging depth and temporal resolution
inverse
relationship between depth and frame rate
inverse
factors determining number of pulses per frame
number of focal points
sector size
line density
how can sonographers change temporal resolution
depth
pulses per scan line
sector size
main advantage of multiple focal zones
better lateral resolution
main advantage of high line density
higher spatial resolution
relationship between pulses per frame and frame rate
inverse
relationship between sector size and t frame
inverse
factors that affect temporal resolution
depth
line density
focus
sector size
