UCSD BENG 280A - Ultrasound Lecture 3 (10 pages)

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Ultrasound Lecture 3



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Ultrasound Lecture 3

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Pages:
10
School:
University of California, San Diego
Course:
Beng 280a - Principles of Biomedical Imaging
Principles of Biomedical Imaging Documents

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Bioengineering 280A Principles of Biomedical Imaging Fall Quarter 2006 Ultrasound Lecture 3 TT Liu BE280A UCSD Fall 2006 Focusing with Phased Array TT Liu BE280A UCSD Fall 2006 Anderson and Trahey 2000 1 Focusing and Steering TT Liu BE280A UCSD Fall 2006 Prince and Links 2005 Dynamic Focusing TT Liu BE280A UCSD Fall 2006 Prince and Links 2005 2 Doppler Effect http www centrus com br DiplomaFMF SeriesFMF doppler capitulos htm chapter 01 htm TT Liu BE280A UCSD Fall 2006 Doppler Effect f 2vf 0 2vf 0 c v c Example v 50 cm s c 1500 m s f0 5 MHz 2vf 0 3333 Hz c TT Liu BE280A UCSD Fall 2006 3 Doppler http www centrus com br DiplomaFMF SeriesFMF doppler capitulos htm chapter 01 htm TT Liu BE280A UCSD Fall 2006 CW Doppler http www centrus com br DiplomaFMF SeriesFMF doppler capitulos htm chapter 01 htm TT Liu BE280A UCSD Fall 2006 4 CW Doppler f0 f f0 f0 f0 f Effective width 1 Tobs TT Liu BE280A UCSD Fall 2006 CW Doppler Resolution f 1 Tobs v c f c 2 f 0 2Tobs f 0 Example Design goal v 5 cm s f 0 5 MHz Tobs c 1500m s 3ms 2 vf 0 2 0 05m s 5 10 6 Note that for a depth of 15 cm it takes only 200 usec for echos to return TT Liu BE280A UCSD Fall 2006 5 PW Doppler http www centrus com br DiplomaFMF SeriesFMF doppler capitulos htm chapter 01 htm TT Liu BE280A UCSD Fall 2006 PW Doppler http www centrus com br DiplomaFMF SeriesFMF doppler capitulos htm chapter 01 htm TT Liu BE280A UCSD Fall 2006 6 TT Liu BE280A UCSD Fall 2006 Siemens Medical Systems jnormal common carotid artery Aliasing Measure Doppler shifts at a specified range For unambiguous range one pulse at a time TPR 2rmax e g 200 usec for 15 cm depth c To avoid aliasing require 1 2 f max TPR f f f f f f 1 TPR Aliased TT Liu BE280A UCSD Fall 2006 7 Aliasing http www centrus com br DiplomaFMF SeriesFMF doppler capitulos htm chapter 01 htm TT Liu BE280A UCSD Fall 2006 Aliasing http www centrus com br DiplomaFMF SeriesFMF doppler capitulos htm chapter 01 htm TT Liu BE280A UCSD Fall 2006 8 Aliasing http www centrus com br



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