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British Journal of Radiology (2005) 78, 733-736
© 2005 British Institute of Radiology
doi: 10.1259/bjr/25662922
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The effect of Butterworth and Metz reconstruction filters on volume and ejection fraction calculations with 99Tcm gated myocardial SPECT

T Vakhtangandze, MD, PhD 1,2 D O Hall, PhD 3 F V Zananiri, PhD 3 and M R Rees, FRCP, FRCR 2

1 Department of Nuclear Medicine, Institute of Radiology and Interventional Diagnostics, Tbilisi, Georgia, 2 Department of Radiology, Bristol University, Bristol and 3 Department of Medical Physics and Bioengineering, United Bristol Healthcare Trust, Bristol, UK



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  		Figure 1. (A) Calculated left-ventricular volumes; (B) Left-ventricular ejection fractions (LVEF). Metz filter {graysqu} Butterworth filter {blacksquare}. ESV, end systolic volume; EDV, end diastolic volume; SV, stroke volume.

 


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  		Figure 2. End-diastolic volume ({blacklozenge}) and end-systolic volume ({blacksquare}) calculated with Metz and Butterworth Filters.

 


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  		Figure 3. Comparison of left-ventricular ejection-fraction (LVEF) calculated with Metz and Butterworth filters.

 


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  		Figure 4. Left-ventricular ejection-fraction (LVEF) calculated with Butterworth ({blacklozenge}) and Metz ({blacksquare}) filters, and difference between LVEF calculations ({blacktriangleup}), compared with defect size measured by Myoquant Index.

 


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  		Figure 5. End-systolic volumes calculated with Butterworth ({blacklozenge}) and Metz ({blacksquare}) filters, and the difference between these ({blacktriangleup}), compared with the Myoquant Index.

 




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