Coded Excitation for Synthetic Aperture Ultrasound Ppt Powerpoint Presentation slides Matthew O'Donnell Medical Slideshow The Acute Patient: Code Heart Code STEMI Code Blue It

Coded Excitation for Synthetic Aperture Ultrasound

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Notes

Show Notes

Slide 1 :

Pulse Compression Coded waveform Decoded pulse Coded Excitation

Slide 2 :

Slide 3 :

Code Length Limit: Depth of Field

Slide 4 :

Code Length Limit T = 2DR/c = 16/f0 (f/num)2 TB = 16 (f/num)2 Df

Slide 5 :

Code Length Limit: SNR TB = 16 (f/num)2 Df Df = Fractional Bandwidth Df = 0.50 f/num = 2 TB = 32 SNR Gain(dB) = 10 log10(TB) SNR Gain ˜ 15 dB

Slide 6 :

Code Length Limit: Sidelobes Small BT codes have high sidelobes Control sidelobes with inverse filter Control sidelobes with Golay codes

Slide 7 :

First Demonstration - 1986

Slide 8 :

IVUS

Slide 9 :

Combined Side/Forward-viewing Catheter

Slide 10 :

Combined Array Element

Slide 11 :

Experimental Array Front Face

Slide 12 :

Slide 13 :

Inverse Filter Design

Slide 14 :

0 0.2 0.4 0.6 0.8 1.0 -40 -30 -20 -10 0 Amplitude (dB) Digital Frequency (w/p) Optimum Code Spectrum

Slide 15 :

Excitation codes Decoding sequence Decoded excitation Coded EXcitation with Spectrum Inversion (CEXSI)

Slide 16 :

Energy Coupling (43-bit baseband) 0 10 20 30 40 50 -40 -30 -20 -10 0 Freq (MHz) Amplitude (dB) burst transducer

Slide 17 :

Coded EXcitation with Spectrum Inversion (CEXSI)

Slide 18 :

Energy Coupling (21-bit Carrier) 0 10 20 30 40 50 -40 -30 -20 -10 0 Freq (MHz) Amplitude (dB) burst transducer

Slide 19 :

General Taxonomy Pulse Digit Burst

Slide 20 :

Optimum: 13-bit code, 2.6 ms 2-cycle carrier encoding Coded EXcitation with Spectrum Inversion (CEXSI)

Slide 21 :

Energy Coupling (13-bit Carrier) 0 10 20 30 40 50 -40 -30 -20 -10 0 Freq (MHz) Amplitude (dB) burst transducer

Slide 22 :

Signal (mV) Time (msec) Pulsed Excitation 0 1 2 3 4 5 -5 0 5 echo

Slide 23 :

Signal (mV) Time (msec) Coded Excitation 0 1 2 3 4 5 -5 0 5

Slide 24 :

SNR improvement = 14.5 dB 0 1 2 3 4 5 -40 -30 -20 -10 0 Amplitude (dB) Time (msec)

Slide 25 :

1024 Averages 0 1 2 3 4 5 -40 -30 -20 -10 0 Amplitude (dB) Time (msec) -50 side-lobe

Slide 26 :

Conclusions Small TB codes are practical 10-15 dB SNR improvement possible Sidelobes can be controlled

Slide 27 :

Applications Color-flow imaging (B-Flow) Endoscopy (low-voltage world) Real-time 3-D ??

Slide 28 :

Slide 29 :

Xmit – System 1 To Array

Slide 30 :

Receive – System 1

Slide 31 :

Xmit – System 2 To Element1 To ElementN

Slide 32 :

Receive – System 2 Signal Out Decode From Element1 Decode From ElementN

Slide 33 :

Xmit – System 3 To Array

Slide 34 :

Receive – System 3 From Array Signal Out

Slide 35 :

Slide 36 :

Catheter Array C-Mode Image B-Mode Image Simulated Images

Slide 37 :

-30 -20 -10 0 m m m m c-plane at f# = 4 -2000 0 2000 -2000 0 2000 -15 -10 -5 0 m m c-plane at f# = 4 -2000 0 2000 b-mode plane distance (mm) range ( m m) -5000 0 5000 3000 7000 b-mode plane distance (mm) -5000 0 5000

Slide 38 :

Compounding

Slide 39 :

C-plane 1 pulse-length 2 pulse-length 3 pulse-length 4 pulse-length 5 pulse-length 6 pulse-length 8 pulse-length 10 pulse-length

Slide 40 :

B-mode plane 1 resolution-cell 2 resolution-cell 3 resolution-cell 4 resolution-cell 6 resolution-cell 8 resolution-cell 10 resolution-cell

Slide 41 :

C-plane 1 pulse-length 2 pulse-length 3 pulse-length 4 pulse-length 5 pulse-length 6 pulse-length 8 pulse-length 10 pulse-length

Slide 42 :

b-mode plane 1 resolution-cell 2 resolution-cell 3 resolution-cell 4 resolution-cell 6 resolution-cell 8 resolution-cell 10 resolution-cell

Slide 43 :

Slide 44 :

First Demonstration - 1986

	hoot4@twcny.rr.co 1 Years ago. Category: Cardiology

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