Term
| tissue-equivalent phantom |
|
Definition
| an attenuation of about 0.5 dB/cm-MHz and a propagation speed of 1.54 mm/us. |
|
|
Term
|
Definition
| does not mimic tissue but provides a means for measuring some aspect of instrument performance. |
|
|
Term
|
Definition
| nylon fibers, simulated cysts, minimal spacing of separately displayed fibers |
|
|
Term
|
Definition
| nylon fibers, simulated cysts, lateral smearing of fibers |
|
|
Term
|
Definition
| nylon fibers, fibers distances from transducer or from each other on the display |
|
|
Term
|
Definition
| nylon fibers, fibers distances from the trasducer or from each other on the display |
|
|
Term
|
Definition
| hyperechoic and hypoechoic |
|
|
Term
|
Definition
| attenuating scattering material, gain setting |
|
|
Term
|
Definition
| attenuating scattering material, deepest scattering material imaged |
|
|
Term
|
Definition
| attenuating scattering material, gain setting, deepest scattering material imaged |
|
|
Term
|
Definition
|
|
Term
|
Definition
|
|
Term
| test objects and phantoms |
|
Definition
|
|
Term
|
Definition
| useful in checking the accuracy of dopplar spectral displays. |
|
|
Term
|
Definition
| useful in simulating physiologic flow conditions for a dopplar instrument |
|
|
Term
|
Definition
| tissue-equivalent phantoms attempt to represent this property |
|
|
Term
| can be measured or calculated by a hydrophone |
|
Definition
| amplitude, period, pulse duration, pulse repetition period |
|
|
Term
|
Definition
| contains small transducer element |
|
|
Term
|
Definition
|
|
Term
| you can find the frequency if you know the |
|
Definition
|
|
Term
| you can find the pulse duration frequency if you know the |
|
Definition
|
|
Term
| you can find the duty factor if you know the |
|
Definition
| pulse repetition period and pulse duration |
|
|
Term
| you can find the wavelength if you know the |
|
Definition
|
|
Term
| you can find energy if you know the |
|
Definition
|
|
Term
| you can find the intensity if you know the |
|
Definition
|
|
Term
|
Definition
| piezoelectric material commonly used in hydrophones |
|
|
Term
|
Definition
| importand characteristic of material used in hydrophones |
|
|
Term
|
Definition
| heating depends most directly on |
|
|
Term
| peak rarefactional pressure |
|
Definition
| conditions under which cavitaion may occur |
|
|
Term
|
Definition
| bioeffects have been observed in experimental animals with intensities greater than |
|
|
Term
|
Definition
| bioeffects have been observed in experimental animals with focused intensities greater than |
|
|
Term
|
Definition
| focal lesions have been observed in experimental animals with intensities greater than |
|
|
Term
| only when indicated, with minimum intensity, and minimum time |
|
Definition
| exposure is minimized by using diagnostic ultrasound |
|
|
