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The principle of ultrasound: Difference between revisions
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'''Period''' of an ultrasound wave is the time that is required to capture one cycle, i.e., the time from the beginning of one cycle till the beginning of the next cycle. The units of period is time and typical values in echo is 0.1 to 0.5 microsecond. Period of ultrasound is determined by the source and cannot be changed by the sonographer. | '''Period''' of an ultrasound wave is the time that is required to capture one cycle, i.e., the time from the beginning of one cycle till the beginning of the next cycle. The units of period is time and typical values in echo is 0.1 to 0.5 microsecond. Period of ultrasound is determined by the source and cannot be changed by the sonographer. | ||
[[File:PhysicsUltrasound_Fig2.svg|left| Fig. 2]] | |||
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Frequency is the inverse of the period and is defined by a number of events that occur per unit time. The units of frequency is 1/sec or Hertz (Hz). Since f = 1/P, it is also determined by the source and cannot be changed. | Frequency is the inverse of the period and is defined by a number of events that occur per unit time. The units of frequency is 1/sec or Hertz (Hz). Since f = 1/P, it is also determined by the source and cannot be changed. | ||