how to fuse 2 set data different length frame

Hi all, i have 60 image SPECT, and 193 Image CT. how to fuse it? which different length frame/slice.

i use imfuse but failed.

anyone can help me?

clc
 clear all
 
% Get a list of all files in the folder with the desired file name pattern.
myFolder = 'C:\Users\Akmal\Downloads\phantom IEC, weight 12.8 kg-20210104T080816Z-001\phantom IEC, weight = 12.8 kg\xQuant\xquant';
filePattern = fullfile(myFolder, '*.dcm'); % Change to whatever pattern you need.
theFiles = dir(filePattern);
for K = 1 : length(theFiles)
    baseFileName = theFiles(K).name;
    fullFileName = fullfile(theFiles(K).folder, baseFileName);
    fprintf(1, 'Now reading %s\n', fullFileName);
    % Now do whatever you want with this file name,
    % such as reading it in as an image array with imread()
       N(:,:,K) = dicomread(fullFileName);
         scale = 256/103 ;
 Pi(:,:,K) = imresize(N(:,:,K),scale) ; % where P is your 103*103 3D matrix  
end

% Get a list of all files in the folder with the desired file name pattern.
myFolder = 'C:\Users\Akmal\Downloads\phantom IEC, weight 12.8 kg-20210104T080816Z-001\phantom IEC, weight = 12.8 kg\xQuant\xquant\ct';
filePattern = fullfile(myFolder, '*.dcm'); % Change to whatever pattern you need.
theFiles = dir(filePattern);
for L = 1 : length(theFiles)
    baseFileName = theFiles(L).name;
    fullFileName = fullfile(theFiles(L).folder, baseFileName);
    fprintf(1, 'Now reading %s\n', fullFileName);
    % Now do whatever you want with this file name,
    % such as reading it in as an image array with imread()
       M(:,:,L) = dicomread(fullFileName);
  
end

imfuse2(Pi, M);

[KSSV]

What error it shows?