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Definition
| The ability of an imaging system to detect weak echoes. Ability of a Doppler system to detect weak or small Doppler shifts. |
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Definition
| Production of Bubbles, Two Types: Stable and Transient. Tested in a liquid medium will increase with sufficient pressure amplitude and frequency. |
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Term
| Peak rarefractional pressure |
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Definition
| an increase in rarefractional pressure would cause an increased possibility of cavitations. |
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Definition
| As low as reasonably achievable, minimum risk while obtaining the necessary diagnostic benefit of ultrasound. AIUM patient safety standards recommends using minimum output power |
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Definition
| Ultrasound measuring device used to measure pressure amplitude, pulse waveform and bandwidth. It is able to calculate acoustic pulse parameter . A small transducer element mounted on the end of a needle . Generally, sonographic outputs are lowest and spectral Doppler outputs are highest. |
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Definition
| An indicator proposed by AIUM that relates to cavitation. this is equal to the peak rarefractional pressure divided by the square root of the resonant frequency. MI is Higher with higher pressure and lower frequency |
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Definition
| A Number used by the AIUM that related to tissue heating that could be produced by a sound beam. this is equal to transducer's output power. There three type of Thermal Index classifications: TIS for soft tissue, TIB for bone, and TIC for Cranial bone at skin surface. |
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Term
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Definition
| Ratio (in decibels) of the largest power to the smallest power an ultrasound system can handle . A range of signal amplitudes a system can receive and process |
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Definition
| the force exerted by a sound beam on an absorber or reflector. Force can disrupt structures. |
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