Properties of holographically produced complex spatial filters for real-time deconvolution of blurred ultrasound images
All ultrasound pulse-echo imaging systems suffer from limitations of both lateral and axial resolution due to beam-width and pulse-length respectively. Therefore a point-target will always be depicted as a blurred dot. In essence only deconvolution of the system's impulse-response (or smear-fu...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Institute of Fundamental Technological Research Polish Academy of Sciences
2015-07-01
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| Series: | Archives of Acoustics |
| Online Access: | https://acoustics.ippt.pan.pl/index.php/aa/article/view/3207 |
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| Summary: | All ultrasound pulse-echo imaging systems suffer from limitations of both lateral and axial resolution due to beam-width and pulse-length respectively. Therefore a point-target will always be depicted as a blurred dot.
In essence only deconvolution of the system's impulse-response (or smear-function or blurring) could provide further improvement. Earlier an optical system was described potentially capable to process the echo-signals as received by a phased-array pulse-echo system in real-time and in two dimensions.
A holographic method can be used to produce a complex spatial filter for a particular reference-target which performs to some extent inverse filtering or deconvolution.
Both model-evaluations and experiments were carried out, showing a reasonable agreement.
With the used amplitude transmission-characteristic of the photographic emulsion complex spatial filters can be produced showing inverse-filter properties For only a small dynamic range.
Further work should be devoted to increasing the filter's dynamic range and dynamic range compression methods prior to the filtering. |
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| ISSN: | 0137-5075 2300-262X |