Help with creating image input for imaging toolbox

Hello,

I am trying to do some MRI imaging analysis using a fat/water separation toolbox. The toolbox wants data in the form of:

imDataParams.images: acquired images, array of size[nx,ny,1,ncoils,nTE]

imDataParams.TEs: echo times (in seconds)

imDataParams.fieldStrength: (in Tesla)

imDataParams.isclockwise = true/false

I cannnot put all of the picture data into an array with the other imputs, for example, suppose 'Picture' = the image I took. I cannot put [Picture, 1,1,3] without an error. I can make it into a cell but the program seems to want a structure. What should I do if I want to put the picture data into an array with nz, ncoils, and nTE?

picture = imread('MRIm1.jpg');

save('pictureim.mat', 'picture');

PictureIm = im2double(picture);

save('picturedbl.mat', 'PictureIm');

imDataParams.images = [PictureIm, 1, 1, 3];
imDataParams.TE = [.0028,.0038,.0048];
imDataParams.FieldStrength = 9.4;
imDataParams.PrecessionIsClockwise = 1;

save('Picture2.mat', 'imDataParams');