understanding ultrasound physics Ch 17
Exam Questions with Latest Update
harmonic frequency? - ANSWER-twice the fundamental frequency (second harmonic
frequency)
fundamental frequency? - ANSWER-the frequency of sound created by the transducer
and transmitted into the body.
transducer transmits a sound pulse with a frequency of 2 MHz.. what about in harmonic
mode? - ANSWER-4 MHz
harmonic frequency sound waves arise from? - ANSWER-nonlinear behavior
harmonic frequency waves undergo? - ANSWER-less distortion than fundamental
sound waves
two important forms of harmonics that are in important in diagnostic sonography? -
ANSWER-tissue harmonics
contrast harmonics
linear means? - ANSWER-proportional or symmetrical
nonlinear? - ANSWER-irregular or disproportional or uneven
sound wave is - ANSWER-a series of compressions and rarefactions
sound travels ... - ANSWER-at slightly uneven speeds through soft tissue, faster
through compressions and slower through rarefactions.
The nonlinear variations in speed creates? - ANSWER-tissue harmonics in the biologic
media
the strength of the harmonic waves grows as sound travels in the tissue? - ANSWER-
TRUE
During fundamental imaging, significant amounts of artifacts arise within the few
centimeters of tissue. They appear for two reasons: - ANSWER-the beam is very strong
the many different superficial anatomic layers distort the sound beam.
tissue harmonic signals do not exist at extremely superficial depths : they develop
deeper in the tissue - ANSWER-TRUE
Exam Questions with Latest Update
harmonic frequency? - ANSWER-twice the fundamental frequency (second harmonic
frequency)
fundamental frequency? - ANSWER-the frequency of sound created by the transducer
and transmitted into the body.
transducer transmits a sound pulse with a frequency of 2 MHz.. what about in harmonic
mode? - ANSWER-4 MHz
harmonic frequency sound waves arise from? - ANSWER-nonlinear behavior
harmonic frequency waves undergo? - ANSWER-less distortion than fundamental
sound waves
two important forms of harmonics that are in important in diagnostic sonography? -
ANSWER-tissue harmonics
contrast harmonics
linear means? - ANSWER-proportional or symmetrical
nonlinear? - ANSWER-irregular or disproportional or uneven
sound wave is - ANSWER-a series of compressions and rarefactions
sound travels ... - ANSWER-at slightly uneven speeds through soft tissue, faster
through compressions and slower through rarefactions.
The nonlinear variations in speed creates? - ANSWER-tissue harmonics in the biologic
media
the strength of the harmonic waves grows as sound travels in the tissue? - ANSWER-
TRUE
During fundamental imaging, significant amounts of artifacts arise within the few
centimeters of tissue. They appear for two reasons: - ANSWER-the beam is very strong
the many different superficial anatomic layers distort the sound beam.
tissue harmonic signals do not exist at extremely superficial depths : they develop
deeper in the tissue - ANSWER-TRUE
