Dicom image, convert to right format from cell type

Hi, I'm tying to plot some dicom images, but I have trouble with the converting part, when operating with cells.

Below is the start of the function, to get a better overview

cla(app.axes_T2)
            a = [app.sortedS.SliceLocation]; % a parameter for the Dicom images 
            b = app.dd_SliceLocation.Value; % dropdown box where the sliceLocation parameter can be choosed 
            b2 = str2double(b); 
            
            for ii = 1:length(a)
              LIA(ii) = ismembertol(b2,a(ii),0.05); % finding the index where the Sliceparameter from the drop down box is 
                                                    % equal the sliceLocation values in the Dicom folder 
            end 
            

If I just show the images, corresponding to the LIA index, they will all be gray. Therfore I need to convert them to double and after that, the ImageT/max(ImageT(:)), as seen below:

             imageT = [app.sortedS(LIA).Image]; %struct of all the images 
             imageT = double(imageT); 
             imageT = imageT./max(imageT(:));           

But the above is not working rigth as the struct collects alle the 16 images in one image, instead of showing one image at the time.

Therfore I made a cell (see below) which contains the correct 16 dicom images, having the int format.

But having the cell format, I do not know how to convert the image to double and perform the './max'-code.

I tried the code written below, but the sentence with the double just returns imageT with 16 cell having naN in them, and the line with './max' gives this message: "Undefined function 'rdivide' for input arguments of type 'cell'."

            imageT = {app.sortedS(LIA).Image}; 
                imageT = {(str2double(imageT(:)))}; 
                imageT = {(imageT./max(imageT{:}))}; 
                imshow(imageT{1},'Parent',app.axes_T2); 
                

I hope you can help me, thanks!