How to calculate left ventricle ejection fraction?

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Ahmad Alenezi
Ahmad Alenezi 2019-9-20
回答： darova 2019-9-21
Hi all
I would like to calculated left ventricle ejection fraction LVEF of the heart from an image set. I have a series of planner images (128x128) (n =16) for one patient (derived from SPECT modality). LVEF is calculated according to the following equation:
LVEF = (Left ventricle end diastolic counts - left ventricle end systolic counts)/ Left ventricle end diastolic counts
Note:
Left ventricle end diastolic counts: is the image of the highest count in the series.
Left ventricle end systolic counts: is the image of the lowest count in the series.
In order to show count from left ventricle only, i drawn ROI around left ventricle and masked all other parts, so that the left ventricle only is visible. I called this serires LVimages.
can you help me on how to do this calculation? note that my image series is called LVimages.
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darova
darova 2019-9-20
FOr eahc image you have 128x128 pixels with some values. What do you want to do with pixels? How to find green area?
Ahmad Alenezi
Ahmad Alenezi 2019-9-21
编辑：Ahmad Alenezi 2019-9-21
I want to know the number of pixels and pixel values within ROIs in all images.

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darova
darova 2019-9-21
There is an example with using impoly
I = imread('img1.png');
imshow(I)
h = impoly; % draw polygon
msk = h.createMask; % get pixels inside polygon (binary mask)
number = sum(msk(:)); % number of pixels inside polygon
% create (M x N x 3) mask and get values
msk3 = uint8( repmat(msk,[1 1 3]) );
I1 = msk3 .* I;
figure
imshow(I1)

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