Phantom to test MUGA software Bill Thomson, Joe O’Brien Nigel Williams.

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Presentation transcript:

Phantom to test MUGA software Bill Thomson, Joe O’Brien Nigel Williams

Not New! Phantom developed some years ago need to test amplitude and phase component not designed for ejection fraction

Normal / Abnormal MUGA scan

Single Harmonic Fourier At each pixel position, we fit a curve based on first term of Fourier series a + b.sin(  t) + c.cos(  t) = A.sin(  t +  ) the first harmonic is a sinusoid function with the fundamental frequency  and a phase angle .

Sum of Cos and Sin terms + =

Sum of Cos and Sin terms + =

Sum of Cos and Sin terms Frequency does not change phase change only + =

Sum of Cos and Sin terms Frequency does not change phase change only + =

Single harmonic Fourier fit A  For each pixel, A Amplitude functional image extent of change  Phase functional image timing

Amplitude and Phase zAmplitude how much movement zPhase onset of contraction 15% threshold (from amplitude) histogram of phase in - whole image ED L ventricle region

Test Procedure zNeed to input sinusoid terms zwant amplitude range % zwant phase values 

Sinusoid shape A A

A A

Curves generated

rotating plane phantom

Amplitude and phase

Phase direction note 90 degree shift in phase angle Phase should follow the phantom Phase is actually going in opposite direction

Change of ED ROI

Effect of change in ED position

Different ROI position

Phantom for EF curve creation Perimeter of phantom based on EF curve similar effects seen shows robust Fourier fit at low ejection fraction and counts

Previous work - different processor Area of LV was delayed phase shows early contraction!! phase was reversed

Previous work - different processor Area of LV was delayed phase shows early contraction!! phase was reversed Corrected program

Higher Harmonic testing 1st harmonic

Higher Harmonic testing 1st harmonic 2nd harmonic

Higher Harmonic testing 1st harmonic 3rd harmonic 2nd harmonic

3 Harmonic phantom

3 harmonic phantom Fourier curve fit tries to fit first EF type component only

3 harmonic phantom, different ROI

3 harmonic fit to noisy data

Issues Phase angle appears to run in wrong direction Will not affect aneurism detection Amplitude and phase dependent on ROI Fourier fits to CDBS curve Time to Peak Fill is based on Fourier curve Suggest use 4 harmonic fit routinely