Chapter 3 in Edelman
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| show | Period, frequency, amplitude, power, intensity, wavelength, and speed
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| The parameters of sound wave are determined by 2 things | show 🗑
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| Definition of period | show 🗑
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| Typical ultrasound period | show 🗑
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| show | Period is determined by the sound source only, not by the medium and is NOT adjustable
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| show | The number of particular events that occur in a specific duration of time. Reported in units per second
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| show | 2 Mhz to 15 Mhz or 2 million to 15 million per second
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| show | Frequency of a sound wave is determined by the sound source only, not by the medium and is NOT adjustable
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| Audible sound frequency | show 🗑
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| Infrasonic frequency or infrasound | show 🗑
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| show | Higher than 20,000 Hz (20 kHz)
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| show | Inversely; as frequency increases, period decreases; as frequency decreases, period increases. They are also reciprocal
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| show | Amplitude, power & intensity. These are the only parameters of the 7 that the sonographer can adjust.
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| show | Amplitude is the "bigness" of a wave. It is the difference between the maximum (or minimum) value and the average or undisturbed value of an acoustic variable. Reported in pascals
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| show | 1 million pascals to 3 million pascals or 1 Mpa to 3 Mpa
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| Characteristics of pressure amplitude | show 🗑
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| show | Power is the rate of energy transfer or the rate at which work is performed. Like amplitude, it describes the "bigness" of a wave. Reported in watts
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| Typical ultrasound power | show 🗑
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| Characteristics of power | show 🗑
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| How are power and amplitude related? | show 🗑
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| Definition of intensity | show 🗑
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| show | 0.01 to 300 W/cm squared
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| Characteristics of intensity | show 🗑
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| show | Intensity (W/cm squared) = power (W)/area (cm squared)
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| How are power, amplitude and intensity related? | show 🗑
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| Definition of wavelength | show 🗑
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| Typical ultrasound wavelength | show 🗑
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| Characteristics of wavelength | show 🗑
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| The wavelength in soft tissue | show 🗑
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| How are frequency and wavelength related? | show 🗑
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| Propagation speed | show 🗑
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| show | Speed is the only parameter determined by the medium ONLY and is NOT adjustable by the sonographer. The Stiffness and density of an object affect the speed of sound.
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| show | 1540 m/s or 1.54 mm/microsec or 1.54 km/s
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| Stiffness | show 🗑
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| Density | show 🗑
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