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CHAPTER 3 DEWITT Questions with Correct Answers
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CHAPTER 3 DEWITT Questions with Correct Answers
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CHAPTER 3 DEWITT Questions with CorrectAnswers
TTE Correct Answer-transthoracic echocardiogram
transthoracic echocardiogram Correct Answer-non-invasive, real time
ultrasound of the heart acquired via the patients chest wall that allows us
to study the anatomy, motion, and blood flow through the heart and
great vessels.
advantages of TTE Correct Answer-minimal staff and equipment
pain free
quick
relatively inexpensive
reliable
portable
provides immediate information
TTE contraindictions Correct Answer-combative patient
interstitial air from chest trauma
morbidly obese
patient refuses the exam
ultrasound Correct Answer-a sound wave with a frequency exceeding
the upper limit of human hearing
,>20,000 herts (Hz) - the unit for cycles per second
how to achieve the highest frame rate possible Correct Answer-acquire
the region of interest with the smallest field of view.
why is depth important in ultrasound Correct Answer-decreasing the
depth decreases the time for the signal to travel to the structure and back,
this increases the frame rate
when improved magnification and resolution are needed what should
you do? Correct Answer-either decrease the depth, adjust the focus, or
utilize the zoom feature.
what does the ZOOM feature do? Correct Answer-decreases sector size,
increases line density, increases frame rate, and improves resolution.
what feature is great for taking a close look at a valve or acquiring
dimensions? Correct Answer-ZOOM feature
the ultrasound transducer is comprised of what? Correct Answer-many
piezoelectric crystals
what are the piezoelectric crystals made of? Correct Answer-lead
zirconate titanate PZT
, each PZT element ___________ and __________ the ultrasound pulses
along a ______ ______, into the chest in the shape of a _______.
Correct Answer-transmits and receives ...................... scan
line....................... beam
What field offers the best resolution? Correct Answer-Near field
what does the number of PZT elements determine? Correct Answer-
determines the number of scan lines
the more scan lines the better the _______________. Correct Answer-
resolution
each frame shows a complete set of ______ _______ therefore a
complete sweep of the ultrasound beam Correct Answer-scan lines
A matching layer within the PZT crystals and the transducer works to
____________ the ____________ ______________ between the
transducer and the skin so more ___________ is transmitted in the body.
Correct Answer-decrease the acoustic impedance..................... sound
air is not a good ____________ Correct Answer-conductor
what is a medium when referring to ultrasound Correct Answer-
ultrasonic gel
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