Week 2 Image optimisation, Bio Effects, QC Flashcards
transducer indicator pointed towards __ in anterior transverse plane
right shoulder
transducer indicator pointed towards __ in coronal/sagittal plane
patient’s head
transducer indicator pointed towards __ in posterior transverse plane
left shoulder
transducer indicator pointed towards __ in decubitus plane
patient’s anterior
longitudinal views display structure at its __ dimension with its depth
longest
axial views display structure at its __ dimension with its depth
short axis
surface landmark for bladder, prostate, uterus
symphysis pubis
surface landmark for right lobe of liver, gallbladder
right medial angle of ribs
surface landmark for left lobe of liver, pancreas
xiphoid process of sternum
surface landmark for spleen, left kidney
left lateral angle of ribs
subcostal scanning involves what placement of transducer
transducer angled superiorly beneath inferior costal margin for panning liver
intercostal scanning involves what placement of transducer
transducer placed between ribs & follows rib orientation; useful for scanning high riding liver
transducer manipulation styles
sliding, rocking, sweep, rotate, compression, fan
other modes
doppler mode, pulsed wave, M-mode
depth is important for __
image quality & presentation
if depth is too deep, anatomy will appear __
small at top of image
if depth is too shallow, anatomy will appear __
lost at the bottom
leaving a small area of depth behind allows for __
observing useful artifacts (shadowing & enhancement)
gain amplifies __
reflected signals
Time Gain Compensation
selectively amplifies signals from deeper structures or suppress signals from superficial tissues
Focus
focal zone is point where beam is narrowest with max resolution
dynamic range determines __
number of gray shades
wide dynamic range creates __
smoother image
narrow dynamic range creates
higher contrast image
