Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1995-04-14
1998-05-26
Williams, Hezron E.
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
367 13, 12866001, G01N 2900
Patent
active
057568758
ABSTRACT:
Phantoms for testing and measuring the performance of ultrasonic imaging systems have regions of precisely controlled scattering or echogenicity which contain sub-resolvable scatterers. The regions are precisely positioned so as to define patterns which form images from which the performance of the ultrasonic imaging system can be evaluated to assure the quality of the images. The phantoms can reveal the combined influences of all the stages in the imaging chain in terms of modulation transfer function and resolution limits as well as other artifacts and defects in the system such as aliasing and degraded frequency response which cannot be evaluated with conventional ultrasound phantoms. The subresolution scattering regions may be formed by printing them on a thin film sheet or substrate using photo lithography, electrostatic xerographic printing or etching; the toner particles or deposited material forming the scatters being sub-resolvable in size. Half-tone masks, such as blue noise masks, may be used to produce regions of precisely controlled sub-resolvable scatters to be used for grey scale evaluation of the imaging system by producing speckle images of different echogenicity. The thin film sheets are thinner than the thickness of the ultrasonic beam and enable propagation of the beam in the plane of the sheets to the patterns which may be located at different depths. The thin film sheets may be displaced, as by being vibrated. The sheets may be made of piezoelectric material having electrodes across which varying electrical signals are applied to displace the sheets thereby simulating movement of objects for Doppler measurements.
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Parker Kevin J.
Phillips Daniel B.
Ashraf Nashmiya
Lukacher K.
Lukacher M.
The University of Rochester
Williams Hezron E.
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