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During the two recent decades, quantitative ultrasound (QUS) methods have been developed for in vivo diagnostics of trabecular bone. Mostly, trabecular bone QUS measurements are conducted in through-transmission and pulse-echo geometry. Since the first in vivo QUS measurements at the heel, the research efforts have also been focused on enabling QUS measurements at important fracture sites, such as...
Low Density Parity Check Codes (LDPC) give groundbreaking performance which is known to approach Shannon's limits for sufficiently large block length. Historically and recently, LDPC have been known to give superior performance than concatenated coding. In the following paper, a proposal to modify the standard Min-Sum (MS) algorithm for decoding LDPC codes is presented. This is done by introduction...
The integrated reflection coefficient (IRC) has been shown to be an important US parameter for tissue characterization. However, conventional estimation using a planar reference reflector results in considerably prediction errors for defocused and inclined conditions. In this study inclination and axial distance dependence of the IRC was investigated both theoretically and experimentally. Ultrasound...
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