| 摘要 |
<p>A method and apparatus for detecting the presence of gas cavities in the abdomen, the thorax and elsewhere is disclosed. The apparatus includes an actuator for transmitting low frequency vibro-acoustic waves (such as from a white noise generator, impulse wave or chirp signal) into the body at a first location and a detector (such as from a vibro-acoustic sensor, microphone, air-coupled microphone or optical detector) for receiving the transmitted low frequency vibro-acoustic waves at a second location on the body. The actuator and detector are positioned to be effective for detecting the suspected gas cavity. The detector generates a response signal which is analyzed. Resonance waves and anti-resonance waves in the detected signal indicate the presence of a gas cavity.</p> |
