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Definition
| Situated away from the surface |
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Definition
| At right angles; perpendicular |
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Definition
| Are of the abdominopelvic cavity located behind or posterior to the peritoneum. |
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Definition
| Situated on or toward the surface. |
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Definition
| The thermal energy imparted to matter by absorption of acoustic radiation of irradiated material at the site of interest. The unit is joule. |
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Definition
| Fractional decrease due absorption only of amplitude of a plane wave per unit distance. Also called amplitude absorption coefficient. The unit is neper per centimeter or decibel per centimeter. |
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Definition
| That part of the transmission loss due to the conversion of sound energy to thermal energy, with in the medium. The unit is neper or decibel |
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Definition
| The reciprocal of the acoustic stiffness, it is the ratio of the fractional change in volume to the change in pressure. The unit is reciprocal Pascal (Pa) |
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Definition
| Mechanical energy transported by an acoustic wave. The unit is the joule |
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Term
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Definition
| A lens used to focus or diverge a sound beam. An acoustic lens is usually made of plastic or epoxy and is mounted on the front of a transducer. An acoustic lens can be simulated by electronically delaying echo signals arriving at, or emitted by various transducer elements. |
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Term
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Definition
| The value of total absolute pressure minus the ambient pressure. The unit is the Pascal where 1pascal=1 Newton per square meter. |
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Term
| Acoustic repetition period |
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Definition
| Equal to the pulse period for non automatic scanning systems and the scan repetition perio for automatic scanning systems. The unit is second. |
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