Kremkau Chapter 4- Instruments Questions and answers
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Course
Sonography
Institution
Sonography
The ultrasound PRF is equal to the voltage ______ repetition frequency of the pulser.
Pulse
Increased voltage amplitude produced by the pulser increases the ______ and _____ of ultrasound pulsed produced by the transducer.
Amplitude, frequency
Functions performed by the signal proce...
Kremkau Chapter 4- Instruments
Questions and answers
The ultrasound PRF is equal to the voltage ______ repetition
frequency of the pulser. - answer Pulse
Increased voltage amplitude produced by the pulser increases the
______ and _____ of ultrasound pulsed produced by the transducer. -
answer Amplitude, frequency
Functions performed by the signal processor include ________, ________
and _________. - answer Filtering, detection, compression
Amplification increases all _______. - answer Amplitudes
________ corrects for tissue attenuation. - answer Compensation
Filtering reduces _________. - answer Noise
Detection converts pulses from _________ ___________ to _______ form -
answer Radio frequency, amplitude
Time gain compensation is accomplished in the ________ ______. -
answer Beam former
Compensation takes into account reflector ________. - answer Depth
, Compensation amplifies echoes differently, according to their arrival
_______. - answer Times
Compensation decreases the ______ range to a range that the ______
and human ________ can handle. - answer Dynamic, display, vision
Detection converts voltage pulses from _______ ________ form to ______
form. - answer Radio frequency, amplitude
True or false: Filtering widens bandwidth? - answer False
The compression or dynamic range control reduces the range of
echo amplitudes displayed by reducing the weakest to _______ and/or
the strongest ones to the ________ value. This produces a ______
contrast image with elimination of weakest and maximizing of
strongest echoes. - answer Zero, maximum, higher
Memories of _____ to _____ bits per pixel are common in ultrasound
today. - answer 6, 8
Digital memories store _______ - answer Numbers
_________ is commonly controllable by the operator. - answer
Postprocessing
The primary formats of image presentation are called _______ mode,
_______ mode, and ________ mode. They are used in ______, _______, and
________ types of clinical imaging, respectively. - answer B, M, A, all,
cardiac, ophthalmic
_________ mode is used for studying the motion of a structure such as
a heart valve. - answer M
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