Lecture 4 -9/17
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| show | an imaging technique that uses high frequency sound waves to produce images or organs and structures in the body.
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| show | by recording the reflections (echoes) of ultrasonic waves directed into the body.
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| show | admits sound waves and reads them
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| High frequency transducer = what? | show 🗑
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| Low frequency transducer = what? | show 🗑
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| Why are some transducers flat? | show 🗑
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| Linear or curved linear traducers are used for? | show 🗑
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| Sound waves that are heard by the human ear are called? What is their frequency? | show 🗑
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| show | Ultrasonic, 1-17MHz
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| Sound waves are transmittable only in ______ &_______, not in ______ or ______. | show 🗑
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| Why is ultrasound harmless? | show 🗑
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| show | WW1
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| What is sonar? | show 🗑
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| show | The first unit built in early 1950's by the Japanese. Anatomy was represented by a series of "blips" on the screen, height was related to the returning echo.
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| show | Japan, US, and Europe developed 2-D gray scale system. Returning echoes represented by varying degrees of gray.
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| When was real time dynamic introduced? | show 🗑
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| Who was the first to use doppler? and for what? | show 🗑
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| When was doppler introduced? and for what? | show 🗑
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| show | In the 1990's, convert to digital format, processing, manipulation, viewing, storage, and send images to remote sites.
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| show | converts one energy to another. (electrical energy to ultasound energy) sends sound waves and reads them.
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| The transducer contains a ______ ___ that creates _____ frequency sound when an electrical current is passed through it causing it to ________. Which is called "_________ ____" | show 🗑
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| show | pressure electric
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| Piezoelectric effect describes... | show 🗑
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| show | it ensures there is no loss of signal, as a result of trapped air between the transducer and the skin.
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| show | 5-7MHz, small abdomens, necks, vascular
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| What is the frequency range of a low frequency transducer? And what type of exams would we use them for? | show 🗑
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| The reflected sound waves are called? | show 🗑
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| Name two barriers in the human body. | show 🗑
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| Ultrasound is the gold standard for what exams? (6) | show 🗑
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| show | cystic teratoma that contains developmentally mature skin complete with hair follicles and sweat glands. Almost always benign.
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