Storing a surface slice in a .mat file and plotting the stored slice

Hi,

I use the slice function in matlab to slice through an echocardiopgrahic volume. As i create several slices from the volume, i want to increase the speed of my function. I want to create all the slices I want to plot (180 x 30ish slices) and store them somewhere (.mat or something simmilar). Then I want to be able to extract one of the slices and plot it. Here is what i want to do:

create several slices s,s1,s2....

s=slice(X,Y,Z,vol,X_1,Y_1,Z_1,'linear');

s1=slice(X,Y,Z,vol,X_2,Y_2,Z_2,'linear');

s2..

save(s,s1,s2....)

If i want to plot s2:

plot(s2)

I know that it will take some time to store all the slices, but then i omit to use the slice function everytime i want a new slice. I have experienced that the interp3 function is rather slow. I do not want to store them as a image, but i want the surface structure to be the same.

Is this possible?

Answer 1

[Ameer Hamza]

Why not just save the .fig files. See savefig(): https://www.mathworks.com/help/matlab/ref/savefig.html

Alternatively, you can also save fig handle in a .mat file, but that is not an recommended approach.

And if you really want to save the handle of slice objects in a .mat file then you can replot then as shown below

Save a slice object

s = slice(X,Y,Z,vol,X_1,Y_1,Z_1,'linear');
save('slices.mat', 's');

Then load them like this

data = load('slices.mat');
s = data.s;
ax = axes();
hold(ax);
view(3);
copyobj(s, ax);

[Hans Martin]

Because I need to be able to extract geometrical points from the slices in the plot, when i re-plot them.

[Ameer Hamza]

A .fig file preserves all the information that a slice object preserve (in reality, it save much more information). However, I have updated the answer to show how you can re-plot slices after loading them from a .mat file.

[Hans Martin]

amazing. Thank you!

[Ameer Hamza]

I am glad to be of help!

Answer 2

[KSSV]

You save all the slices into a cell and save them into .mat file.

S = cell(N,1) ; 
S{1} = slice(X,Y,Z,vol,X_1,Y_1,Z_1,'linear');
S{2} = slice(X,Y,Z,vol,X_2,Y_2,Z_2,'linear');

Now you can save S alone which is a cell into a .mat file.

[Hans Martin]

Thank you. What about plotting each slice? plot(S{1}) obiouvsly does not work, but I have not found a nice way to plot them after i store them.

[KSSV]

You save the required X, Y, Z also,,,

[Hans Martin]

Ok, but which function can i use to plot one specific surface? Something simmilar to plot3(X,Y,Z, s{1})?

If i use s=slice .. the slice is plotted. But when i store them, the s is only a surface structure. And i want to extract one surface and plot that surface from the .mat file.