chpt 10 "axial & lateral resolution" physics

ability to create accurate images

• axial resolution

• resolution

• angular resolution

• lateral resolution

axial resolution and lateral resolution are both measured with units of ______

• distance such as mm

• time such as μs

• distance such as w/cm²

• time such as X²

external focusing

• w/ a lens

• w/ a curved active element

• w/ electronics of U/S system

what type of resolution is better in clinical imaging systems : lateral resolution or axial resolution

• - ____ is better because U/S pulses are shorter than they are wide (less numerical value)

• axial

• lateral

• neither

• both

what is the ability to accurately distinguish two structures lying close together ?

• resolution

• depth resolution

• axial resolution

• longitudinal resolution

less ringing , higher frequency =

• shorter pulse

• longer pulse

• less cycles per pulse

• more cycles per pulse

Answer explanation

remember axial resolution has a LOW/LOWER numerical value , less ringing , less pulses per cycle(1 compression & 1 rarefaction) , shorter pulses

for Lateral resolution the acronym used to memorize its other known synonyms _____ is used

• LATTA

• LARRD

• LAARD

• LATA

lateral resolution is best at the _______

• divergence

• focus

• near zone

• far zone

two different transducers create sound pulses. one transducer is labeled 5MHz and the other, 3MHz. Which transducer is more likely to create a more accurate image with respect to axial resolution ?

• neither

• both

• 5MHz

• 3MHz

Answer explanation

high frequency , shorter pulses

axial resolution also known as

• longitudinal resolution

• range resolution

• radial resolution

• depth resolution

• Azimuthal resolution