how to open .nhdr file

Dear all,

I have .nhdr file. as attched

Anyone can help me to open it?

Answer 1

[DGM]

It's just text, but there's already tools to read these files specifically, either with or without the associated data file.

https://www.mathworks.com/matlabcentral/fileexchange/66645-nrrd-nhdr-reader-and-writer

headerInfo = nhdr_nrrd_read('res.nhdr',false) % read the header by itself

[mohd akmal masud]

yah,

headerInfo = 

  struct with fields:

                   content: 'res'
                      data: []
                      type: 'double'
                 dimension: 3
                     space: 'left-posterior-superior'
                     sizes: [135 135 74]
           spacedirections: {'(3,0,0)'  '(0,3,0)'  '(0,0,3)'}
    spacedirections_matrix: [3×3 double]
                     kinds: {'domain'  'domain'  'domain'}
                    endian: 'little'
                  encoding: 'raw'
               spaceorigin: [3×1 double]
                 datafiles: {'data.raw'}

Dear @DGM, what i need is to display sizes: [135 135 74]

I tried this want using function nhdr_nrrd_write.m as attached, but got error:

                 headerInfo = nhdr_nrrd_write('res.nhdr', headerInfo, 'a.dcm');
                 %res.nhdr - my filne name
                 %a.dcm - my new file name that want to create
                 
                 

ERROR:

                 Error using assert
                 Sizes mismatch: [135 135 74 ] in headerInfo structure is not compatible with the size of the data array [0 0
                 ].
                 
                 
                 Error in nhdr_nrrd_write (line 92)
                 assert(nrrd_size_check(size(headerInfo.data), headerInfo.sizes),...

[DGM]

The command I gave was to read only the header, but not the data. Notice that the data field in the struct is empty. If you have the data and want to read both, you'd do

headerInfo = nhdr_nrrd_read('res.nhdr',true) % read the data also

[mohd akmal masud]

Dear @DGM,

But I got error

headerInfo = nhdr_nrrd_read('res.nhdr',true) % read the data also

Error using nhdr_nrrd_read
While reading detached header file res.nhdr:
detached data file number 1/1 (data.raw) could not be opened.

[DGM]

I don't know why it can't read the file. I'm not familiar with these tools, and the error message doesn't say why it failed.