The objective of this work is to investigate ultrasound (US) backscatter in the MHz range from fish to develop a realistic and
reliable simulation model. The long term objective of the work is to develop the needed signal processing for fish species
differentiation using US. In in-vitro experiments, a cod (Gadus morhua) was scanned with both a BK Medical ProFocus
2202 ultrasound scanner and a Toshiba Aquilion ONE computed tomography (CT) scanner. The US images of the fish
were compared with US images created using the ultrasound simulation program Field II. The center frequency of the
transducer is 10 MHz and the Full Width at Half Maximum (FWHM) at the focus point is 0.54 mm in the lateral direction.
The transducer model in Field II was calibrated using a wire phantom to validate the simulated point spread function. The
inputs to the simulation were the CT image data of the fish converted to simulated scatter maps. The positions of the point
scatterers were assumed to be uniformly distributed. The scatter amplitudes were generated with a new method based on
the segmented CT data in Hounsfield Units and backscatter data for the different types of tissues from the literature. The
simulated US images reproduce most of the important characteristics of the measured US image.
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