How to save in dicom format

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mohd akmal masud
mohd akmal masud 2025-2-28
回答： Madheswaran 2025-8-8
Dear All,
I have one file as attached. Then, I open it using my script as below.
Anyone can help me how to save the dataHU (as in my script) in dicom format?
clc
clear all
close all
sz = [128 128 128];
fname = 'nemaho166ab.ict';
fid = fopen(fname);
data = fread(fid,'*float'); % assuming uint
fclose(fid);
data = reshape(data,sz);
imshow3D(data)
muwater = 0.182868;
mudata = data;
dataHU = ((mudata - muwater)./ (muwater-0))*1000;
figure, imshow3D(dataHU);
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mohd akmal masud
mohd akmal masud 2025-2-28
Dear @Walter Roberson,
Sorry Sir, can you please write for me the example.?
Walter Roberson
Walter Roberson 2025-2-28
MetaData = struct('SpecificCharacterSet', 'ISO_IR 100', ...
'ImageType', 4, ...
'SOPClassUID', '1.2.840.10008.5.1.4.1.1.2', ...
%stuff
'SeriesTime', 133355.245000, ...
'Manufacturer', 'SIEMENS', ...
%stuff
);
dicomwrite(YourData, YourFileName, MetaData)

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回答（1 个）

Madheswaran
Madheswaran 2025-8-8
Hello Mohd Akmal Masud,
To summarize the discussions in the comments: MATLAB requires this metadata to be in a "struct" variable to create a valid DICOM file from your "dataHU" matrix.
Here is the syntax from the documentation for your context: "dicomwrite(___,meta_struct)" specifies optional metadata or file options in the structure "meta_struct". The names of fields in "meta_struct" must be the names of DICOM file attributes or options. The value of a field is the value you want to assign to the attribute or option.
The code below shows the minimal steps to create the metadata structure and save a single slice of your data.
% your existing code
% clc
% clear all
% ... (your code goes here)
% dataHU = ...
% create the metadata structure
% The field names (e.g., 'StudyDescription') must match DICOM attribute names.
% This example uses a few attributes from the list you provided.
meta = struct();
meta.StudyDescription = 'Tumor Imaging';
meta.Modality = 'CT';
meta.Manufacturer = 'SIEMENS';
meta.PatientID = '12345'; % A DICOM file requires some patient info
% selecting the first slice to store
slice_data = dataHU(:, :, 1);
dicomwrite(slice_data, 'output_slice.dcm', meta);
For more information, refer to the following MathWorks documentation: https://mathworks.com/help/images/ref/dicomwrite.html
I hope this helps!

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