Filters

04-04-03


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Table of Contents

Filters

Familiar Fourier Facts

Question?

Filters

Use 1D profile data

Who to blame? Fourier

Fourier analysis

sines and cosines

Count Profile - Fourier fit

Count Profile - Fourier fit

Count Profile - Fourier fit

Count Profile - Fourier fit

Count Profile - Fourier fit

Count Profile - Fourier fit

Amplitude - Frequency plot

Amplitude - Frequency plot

Amplitude - Frequency plot

Amplitude - Frequency plot

Amplitude - Frequency plot

Amplitude - Frequency plot

What Happens to Noisy Data?

What Happens to Noisy Data?

What Happens to Noisy Data?

What Happens to Noisy Data?

Power Spectrum

Power Spectrum

Tomography back projection

Tomography back projection

Blurring of back projection

How can we remove the 1/r blurring?

Ramp Function

Ramp Function

Ramp Function

Ramp Function

Ramp Function

Ramp Function

Butterworth Filter

Butterworth Settings

Butterworth Filter

Butterworth Filter

Wiener Filter

Wiener Filter

Maximum cut-off ?

Automatic Filter

Software Revision

Resolution effects

Tomographic Noise

Bone images

Heart Images

2D Fourier

2D Fourier

2D Fourier

2D Fourier

2D Filter of a Duck

2D Filter of a Duck

2D Filter of a Duck

Partial Volume Effect

Partial Volume Effect

Partial Volume Effect

Cylinder phantom

Phantom Study

Phantom Study

Phantom Study

Twin hole phantom

Multi Hole Phantom

Heart phantom Study

Conclusions

Author: bill thomson

Email: Bill.Thomson@swbh.nhs.uk

Home Page: http://myweb.tiscali.co.uk/avison.family/usergroup/users.htm