Method and apparatus for osteoporosis diagnosis
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United States of America Patent
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May 11, 1999
Grant Date -
N/A
app pub date -
Oct 21, 1997
filing date -
Feb 21, 1996
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An osteoporosis diagnosis yapparatus provided with a two-dimensional ultrasonic transducer array (3) comprising a number of cells (1.sub.1, 1.sub.2, . . . ). The ultrasonic transducer array (3) is applied to the skin covering a predetermined bone of a subject, and the individual cells sequentially emit a predetermined number of ultrasonic pulses through the skin while receiving echoes from the bone. The received echo data are processed so that they can be handled in a planewave problem, from which the information on the reflection from the bone is determined. This information is processed to obtain the acoustic impedance of a cortical bone and a cancellous bone, so as to check for the presence of osteoporosis. The information on the reflection from the bone can also be handled as an eigen-value problem, and, when the information is handled in such a manner, the shape determination of a bone becomes un necessary.
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