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| | www.bangkokhospital.com (Site not responding. Last check: 2007-11-03) |
 | | It uses high-frequency sound waves to literally see all four chambers of the heart, the heart valves, the great blood vessels entering and leaving the heart, as well as the sack around the heart. |
 | | Because the sound waves do not readily pass through air, a clear jelly-like substance is applied between the chest and the transducer to improve the contact of the transducer with the skin. |
 | | When sound waves from the ultrasound transducer hit your heart, blood vessels, and other tissues in your body, some of the waves are reflected back. |
| www.bangkokhospital.com /english/heart/heart_Echo.asp (736 words) |
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