Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Acoustic Propagation Properties | The effects of the medium upon the sound wave
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| Biological effects | The effects of the sound wave upon the biologic tissue through which
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| What is sound? | Carries energy from one place to another, longitudinal, travels through medium not vacuum
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| What is pressure? | Concentration of force in an area
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| What is density? | Concentration of mass in a volume
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| What is distance? | Measure of particle motion
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| What is Period? | The time it takes to complete one cycle
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| Spatial | Refers to distance or space
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| What is peak? | Maximum value
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| What is average? | The mathematical middle value
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| Temporal | Refers to all time transit and receive
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| Pulsed | Refers only to transmit time only
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| Attenuation | Decrease in intensity power and amplitude or weakening of a sound wave
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| Reflection | As sound strikes a boundary a portion of waves energy may be redirected or reflected
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| Specular reflection | When sound is reflected only in one direction in an organized manner from a smooth surface
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| Diffuse reflection | When wave reflects off an irregular surface and it radiates and more than one direction
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| Scattering | Random redirection of sound in many directions
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| Frequency | Number of cycles per second
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| Amplitude | The difference between a maximum and average value
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| Wavelength | The distance or length of one complete cycle
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| Propagation speed | The distance that a sound wave travels through a medium in one second
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| Stiffness | Describes the ability of an object to resist compression
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| Density | Describes the relative weight of a material
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| Pulse duration | The actual time from the start of one post to the end of that post
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| Spatial pulse length | The distance that a pulse occupies in space from the start to the end of a pulse
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| Pulse repetition period | The time from the start of one pulse to the start of the next pulse
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| Pulse repetition frequency | The number of pulses that an ultrasound system transmit into the body each second
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| Duty factor | The percentage or fraction of time that the system is transmitting a pulse
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| Rayleigh scattering | A special form of scattering that occurs when the structures dimensions are smaller than the Beams wavelength
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| Absorption | 1 ultrasonic energy energy is converted into another energy forms such as heat
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| Attenuation coefficient | The number of decibels of attenuation that occurs when the sound travels 1 centimeter
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| Half value layer thickness | Distance that sound travels in a tissue that reduces intensity of sound to one half of its original size
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| Impendence | The acoustic resistance to sound traveling in a medium
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| Normal incidence | The incident sound Bean strikes boundary at exactly 90°
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| Oblique incidence | When the incident sound Bean strikes to pound you at any angle other than 90 degrees
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| Piezoelectric Effect | Describes the property of certain materials to create a voltage when they are mechanically deformed
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| Piezoelectric materials | Materials which conversation sound into electricity
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| Acoustic Impedance | Sound obstacle
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| Incident Intensity | Intensity of sound beam immediately before it strikes the boundary
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| Reflected Intensity | Intensity that after striking a boundary returns back or reflects to the TRX
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| Transmitted Intensity | Intensity that after striking boundary continues foward in the same general direction that it travels before
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| Spatial Peak Intensity | The beam's intensity at the location where it is maximum
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| Spatial Average Intensity | The average intensity cross beam's entire cross-sectional area
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| Temporal Peak Intensity | Measuring the intensity of the beam at the instant in time of its maximal value
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| Pulse Average Intensity | Taking averge intensity during the pulse duration(transmit time)
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| Temporal Average Intensity | Averaging the intensity during the entire pulse repetition period-both the transmit and receive times
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| Beam uniformity coefficient | Spread of beam in space
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| Logarithms | Is a novel method of reading numbers
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| Transmission | Is critical to ultrasound's ability to image structures located deep in the body
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| Acoustic Impedance | Is important tissue property that influences the amount of reflection
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| Go-return time or time-of-flight | The elapsed time from pulse creation to pulse reception
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| The 13-Microsecond Rule | Floor every 13 ms of go-return time, the object creating the reflection is 1 centimeter deeper in soft tissue
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Created by:
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