DMS-101 Exam 3 Questions With Complete Solutions
>2 degree Correct Answers Temperature rises ______ are
considered significant, although no significant adverse effects
have been observed for exposures up to 50 hours
0.002 W/cm^2-0.5 W/cm^2 SPTA Correct Answers The
general range of intensities in diagnostic US
0.2 mW/cm^2-400 mW/cm^2 Correct Answers The general
range of intensities in Doppler US
0.3 Correct Answers No independently confirmed significant
bioeffects in mammalian tissue exposed invivo to MI's of _____
0.5 W/cm^2-2.0 W/cm^2 SPTA Correct Answers The general
range of intensities in therapeutic US
1 degree C (TI=1 then possible elevation in temp. is 1 degree C)
Correct Answers Ratio of acoustical power produced by the
transducer to the power required to raise the temperature in
tissue
1 W/cm^2 Correct Answers No independently confirmed
significant bioeffects in mammalian tissue exposed invivo to
focused US below ____ W/cm^2
10 MHz+ with an elevational plane set at 1.5cm Correct
Answers For breast US what transducer MHz and elevational
plane can we use to control slice thickness?
,120-250 Correct Answers About how many elements are in
each array transducer?
250 scan lines Correct Answers Overlap of the elements being
fired means that 3-4 elements would produce how many scan
lines?
3 and 4 Correct Answers Firing sequence is done in alternating
groups of ____ and ____ elements
5 MHz+ with an elevational place set at 3-4cm Correct Answers
For vascular US what transducer MHz and elevational plane can
we use to control slice thickness?
720 mW/cm^2 Correct Answers What is the FDA regulated
intensity limit for I(spta)?
A grouping or arrangement of parts forming a complete unit
Correct Answers What is an array?
A sweeping beam of sound through the tissues Correct Answers
In order to have real time scanning we must be able to create
what?
A transducer assembly with more than one element Correct
Answers What is a transducer array?
About 80 Correct Answers About how many bioeffects are
related to hyperthermia?
Absorption Correct Answers Attenuation is due to what?
, allowed air to enter the transducer which effected sound
transmission Correct Answers What was wrong with the
mechanical transducer leaking?
Annular Correct Answers ring shaped elements, arranged in
concentric circles
Annular Correct Answers What can focus in all directions both
in the plane and transverse to the plane?
Annular Correct Answers What type of array is the only
mechanically steered array?
Annular Correct Answers What type of array might be used for
high intensity focused ultrasound (HIFU) to treat tumors?
Aperture must be wider Correct Answers For longer focal
length what must be wider to maintain the beam width?
Aperture size, Focal Length, and Wavelength Correct Answers
Beam width is determined by what 3 things?
Applied Intensity, frequency of sound, and beam focusing
Correct Answers The amount of heat produced depends on what
3 things?
Array Correct Answers What's another name for electronic
scanning?
>2 degree Correct Answers Temperature rises ______ are
considered significant, although no significant adverse effects
have been observed for exposures up to 50 hours
0.002 W/cm^2-0.5 W/cm^2 SPTA Correct Answers The
general range of intensities in diagnostic US
0.2 mW/cm^2-400 mW/cm^2 Correct Answers The general
range of intensities in Doppler US
0.3 Correct Answers No independently confirmed significant
bioeffects in mammalian tissue exposed invivo to MI's of _____
0.5 W/cm^2-2.0 W/cm^2 SPTA Correct Answers The general
range of intensities in therapeutic US
1 degree C (TI=1 then possible elevation in temp. is 1 degree C)
Correct Answers Ratio of acoustical power produced by the
transducer to the power required to raise the temperature in
tissue
1 W/cm^2 Correct Answers No independently confirmed
significant bioeffects in mammalian tissue exposed invivo to
focused US below ____ W/cm^2
10 MHz+ with an elevational plane set at 1.5cm Correct
Answers For breast US what transducer MHz and elevational
plane can we use to control slice thickness?
,120-250 Correct Answers About how many elements are in
each array transducer?
250 scan lines Correct Answers Overlap of the elements being
fired means that 3-4 elements would produce how many scan
lines?
3 and 4 Correct Answers Firing sequence is done in alternating
groups of ____ and ____ elements
5 MHz+ with an elevational place set at 3-4cm Correct Answers
For vascular US what transducer MHz and elevational plane can
we use to control slice thickness?
720 mW/cm^2 Correct Answers What is the FDA regulated
intensity limit for I(spta)?
A grouping or arrangement of parts forming a complete unit
Correct Answers What is an array?
A sweeping beam of sound through the tissues Correct Answers
In order to have real time scanning we must be able to create
what?
A transducer assembly with more than one element Correct
Answers What is a transducer array?
About 80 Correct Answers About how many bioeffects are
related to hyperthermia?
Absorption Correct Answers Attenuation is due to what?
, allowed air to enter the transducer which effected sound
transmission Correct Answers What was wrong with the
mechanical transducer leaking?
Annular Correct Answers ring shaped elements, arranged in
concentric circles
Annular Correct Answers What can focus in all directions both
in the plane and transverse to the plane?
Annular Correct Answers What type of array is the only
mechanically steered array?
Annular Correct Answers What type of array might be used for
high intensity focused ultrasound (HIFU) to treat tumors?
Aperture must be wider Correct Answers For longer focal
length what must be wider to maintain the beam width?
Aperture size, Focal Length, and Wavelength Correct Answers
Beam width is determined by what 3 things?
Applied Intensity, frequency of sound, and beam focusing
Correct Answers The amount of heat produced depends on what
3 things?
Array Correct Answers What's another name for electronic
scanning?
