HYDROACOUSTICS
ANNUAL JOURNAL |
START | NEW VOL 20 | SEARCH | STATISTICS | PAS - GDANSK DIVISION |
pp. 47-56, vol. 17, 2014 Katarzyna FaliĆska Ultrasound Department, Institute of Fundamental Technological Research Polish Academy of Sciences, Warsaw, Poland Jerzy Litniewski Ultrasound Department, Institute of Fundamental Technological Research Polish Academy of Sciences, Warsaw, Poland Jurij Tasinkiewicz Ultrasound Department, Institute of Fundamental Technological Research Polish Academy of Sciences, Warsaw, Poland Key words: cortical bone thickness; osteoporotic fractures; ultrasound Abstract: Assessment of cortical bone thickness is important from a medical point of view because
bone-layer thickness has a diagnostic value. The thinning of the cortical bone layer reduces
the mechanical strength of the bone and exposes it to an increased risk of osteoporotic
fractures [1]. The hip bone (proximal femur) is the most critical fracture site. The thickness of
the cortical layer in the proximal femur is often too thin to be detected from ultrasonic echoes
using traditional peak detection methods (for example the envelope method). In such a case
the cepstrum analysis technique may be very useful. In this study the cepstrum method was
applied to analyze numerically simulated echoes reflected from the layer and to determine
layer thickness. In simulation, the transducer operated at 1 MHz and pulses of a 1.5 micro s
duration were assumed. The thickness of the thinnest layer for which the applied cepstrum
analysis gave, the correct result equaled 1 mm, which was 0.25 lambda (lambda - wavelength of an
ultrasonic wave). That value of the d/lambda ratio is sufficient for future measurements performed
in-vivo conditions.
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