I would approach it something like this. I don't know how your figure is set up, but somewhere you should have a list of the strings you're putting in the menu/list object. Here, I'm going to presume that this is how it's defined.
Somewhere in figure setup or parameter definitions, you'd have lists associating the menu text and the corresponding filenames ...
% these are ostensibly the list of options that are in the menu
imagenamestrings = {'Alzheimers', ...
'Dementia', ...
'Brain Cancer', ...
'Epilepsy', ...
'Depression', ...
'Schizophrenia',...
'BPD', ...
'Parkinsons', ...
'Stroke', ...
'TIA', ...
'Normal'};
% this is the corresponding list of the actual filenames
imagefilenames = {'Alzheimers_EEG.png', ...
'Dementia_EEG.png', ...
'BrainCancer_EEG.png', ...
'Epilepsy_EEG.jpg', ...
'Depression_EEG.png', ...
'Squizophrenia_EEG.png', ...
'BorderlinePersonalityDisorder_EEG.jpg', ...
'Parkinsons_EEG.jpg', ...
'Stroke_EEG.png', ...
'TIA_EEG.png', ...
'Normal_EEG.png'};
Then somewhere in some callback function ...
% get the string from the object
panelSelection = get(handles.pnlND, 'SelectedObject');
disease = get(panelSelection,'String')
% look up the filename based on the menu string
thisfilename = imagefilenames{strcmpi(disease,imagenamestrings)}
% read just that one file and do something with it
A = imread(thisfilename);
imshow(A)
As Benjamin mentioned, it may be necessary to construct the full path to feed imread(). If you have a fixed path to the directory containing the image files, you can construct the full path like so:
% say that this is defined somewhere with other parameters
imagedirpath = 'path/to/images'; % something like that
% ...
% then somewhere in whatever callback does the loading
A = imread(fullfile(imagedirpath,thisfilename));
PS don't worry about the moderator bot flagging you. Considering the ubiquity of single-use spam accounts, it's critical of new users. I took care of it as soon as I saw it was you.
