Echocardiogram

Echocardiogram - ECHOCARDIOGRAM Vivek Thakkar Tushar Bansal...

Info iconThis preview shows pages 1–8. Sign up to view the full content.

View Full Document Right Arrow Icon
ECHOCARDIOGRAM Vivek Thakkar Tushar Bansal Stephen Sin
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
OVERVIEW Introduction to Ultrasound and its properties. Echocardiogram The Doppler principle and frequency analysis From signal to image
Background image of page 2
SOUND Mechanical vibration in physical medium Hearing Infra, Audible and Ultrasound Sound can be beamed in a particular direction and can be reflected by small objects
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
ULTRASOUND GENERATION Curie Brothers (1880) Mechanical stress Æ Electric charge on surface (Piezoelectric effect) Alternating electric field Æ Change in shape/ thrown into vibration
Background image of page 4
ILLUSTRATION A Æ Crystal subjected to alternating voltages. B Æ Propagation with velocity proportional to velocity of sound in that medium. C Æ Encounters a reflecting point. D Æ Mechanical disturbance of crystal. Voltage Æ Echo strength.
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
SOUND PROPERTIES Sound causes particles of medium to vibrate. Compressed regions Æ Compression Farther apart regions Æ rarefaction These regions generate micro pressure inside tissues. Amplitude depends on voltage to the crystal. Voltage selection is a compromise due to intensity.
Background image of page 6
ULTRASOUND PROPERTIES A Æ Waves traveling in opposite direction. B
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 8
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 02/27/2008 for the course BME 501 taught by Professor Yamashiro,hsiai during the Fall '07 term at USC.

Page1 / 26

Echocardiogram - ECHOCARDIOGRAM Vivek Thakkar Tushar Bansal...

This preview shows document pages 1 - 8. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online