Chapter 10 DMSU 211
Resolution is the ability to __________________. - correct answer ✔Create
accurate images.
Axial resolution measures the ability of a system to display two structures that
are very close together when the structures are ________ to the sound
beam's _________. - correct answer ✔Parallel; Main axis
Axial resolution answers the question: What is the ___________ that two
structures, or positioned front to back (or parallel to the sound beam) can be
apart and still produce ___________ on an ultrasound image? - correct
answer ✔Minimum distance; Two distinct echoes
Axial resolution deals with structures that are _________ to the sound beam. -
correct answer ✔Parallel
Axial resolution is measured in __________. - correct answer ✔mm, or any
other unit of distance.
Axial resolution is related to the ____________________. - correct answer
✔Spatial pulse length
_________ pulses improve axial resolution. - correct answer ✔Shorter
Axial resolution is also related to ______________. - correct answer ✔Pulse
duration
,Axial resolution is also called ________________, ______________,
_______________, or ________________. - correct answer ✔Longitudinal;
Range; Radial; Depth resolution
Is axial resolution adjustable? - correct answer ✔No
In clinical imaging, axial resolution ranges from __________ to __________.
______________ numerical values indicate shorter pulses and improved
image accuracy. - correct answer ✔0.1 to 1.0 mm; Lower
For axial resolution, use the mnemonic: - correct answer ✔LARRD
LARRD:
L = - correct answer ✔Longitudinal
LARRD:
A = - correct answer ✔Axial
LARRD:
First R = - correct answer ✔Range
LARRD:
Second R = - correct answer ✔Radial
LARRD:
D = - correct answer ✔Depth
, ______________ numerical values of axial resolution indicate a shorter pulse.
- correct answer ✔Lower
Shorter pulses create more accurate images; therefore, the image quality is
better when axial resolution has a ________ numerical value. - correct
answer ✔Lower
Axial resolution is determined by the ___________, with ____________
pulses yielding improved _______________. - correct answer ✔Pulse
length; Shorter; Axial resolution
A short pulse is created in two ways:
1) ________ ringing
2) __________ frequency - correct answer ✔Less; Higher
A pulse is short if there are few cycles in the pulse, just like a train is short if
there are few cars in the train. This is known as ______________. - correct
answer ✔Less ringing
One way to reduce ringing is to ______________ after it has been excited by
an electrical signal from the system. - correct answer ✔Dampen the crystal
Shorter wavelengths are characteristic of higher frequency sound. Pulses
made of higher frequency cycles have superior _______________. - correct
answer ✔Axial resolution
Better axial resolution is associated with the following:
_________ spatial pulse length - correct answer ✔Shorter
Resolution is the ability to __________________. - correct answer ✔Create
accurate images.
Axial resolution measures the ability of a system to display two structures that
are very close together when the structures are ________ to the sound
beam's _________. - correct answer ✔Parallel; Main axis
Axial resolution answers the question: What is the ___________ that two
structures, or positioned front to back (or parallel to the sound beam) can be
apart and still produce ___________ on an ultrasound image? - correct
answer ✔Minimum distance; Two distinct echoes
Axial resolution deals with structures that are _________ to the sound beam. -
correct answer ✔Parallel
Axial resolution is measured in __________. - correct answer ✔mm, or any
other unit of distance.
Axial resolution is related to the ____________________. - correct answer
✔Spatial pulse length
_________ pulses improve axial resolution. - correct answer ✔Shorter
Axial resolution is also related to ______________. - correct answer ✔Pulse
duration
,Axial resolution is also called ________________, ______________,
_______________, or ________________. - correct answer ✔Longitudinal;
Range; Radial; Depth resolution
Is axial resolution adjustable? - correct answer ✔No
In clinical imaging, axial resolution ranges from __________ to __________.
______________ numerical values indicate shorter pulses and improved
image accuracy. - correct answer ✔0.1 to 1.0 mm; Lower
For axial resolution, use the mnemonic: - correct answer ✔LARRD
LARRD:
L = - correct answer ✔Longitudinal
LARRD:
A = - correct answer ✔Axial
LARRD:
First R = - correct answer ✔Range
LARRD:
Second R = - correct answer ✔Radial
LARRD:
D = - correct answer ✔Depth
, ______________ numerical values of axial resolution indicate a shorter pulse.
- correct answer ✔Lower
Shorter pulses create more accurate images; therefore, the image quality is
better when axial resolution has a ________ numerical value. - correct
answer ✔Lower
Axial resolution is determined by the ___________, with ____________
pulses yielding improved _______________. - correct answer ✔Pulse
length; Shorter; Axial resolution
A short pulse is created in two ways:
1) ________ ringing
2) __________ frequency - correct answer ✔Less; Higher
A pulse is short if there are few cycles in the pulse, just like a train is short if
there are few cars in the train. This is known as ______________. - correct
answer ✔Less ringing
One way to reduce ringing is to ______________ after it has been excited by
an electrical signal from the system. - correct answer ✔Dampen the crystal
Shorter wavelengths are characteristic of higher frequency sound. Pulses
made of higher frequency cycles have superior _______________. - correct
answer ✔Axial resolution
Better axial resolution is associated with the following:
_________ spatial pulse length - correct answer ✔Shorter
