lecture11 - BIEN 130: Bioinstrumentation L11 May 5, 2009...

Info iconThis preview shows pages 1–6. Sign up to view the full content.

View Full Document Right Arrow Icon

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

View Full DocumentRight Arrow Icon

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

View Full DocumentRight Arrow Icon

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

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

Unformatted text preview: BIEN 130: Bioinstrumentation L11 May 5, 2009 Hyle Park Ultrasound Frequency f=10 MHz Speed in tissue v=1500 m/ s Pulse length t p =0.01 ms Imaging depth d mx =20 cm How many cycles in one pulse? How long does it take for the pulse to travel the depth of the sample? What should the measurement period be? How long does it take to acquire one depth profile (A-scan)? Ultrasound Frequency f=10 MHz Speed in tissue v=1500 m/ s Pulse length t p =0.01 ms Imaging depth d mx =20 cm What is the imaging resolution (related to smallest resolvable object size)? Any limitations on sampling frequency? Demodulation The actual object doesnt have irregularities that the measured signal has Irregularities caused by center frequency of sound Need signal processing to get rid of fast banding and only give the outline of the signal Easy to pick out by eye, but how to automate the process? Fourier transforms Complex numbers Definition The point of Fourier transforms is to identify what...
View Full Document

Page1 / 11

lecture11 - BIEN 130: Bioinstrumentation L11 May 5, 2009...

This preview shows document pages 1 - 6. Sign up to view the full document.

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