Dear SPM users,
I'm trying to convert PET images in interfile format (created with PARAPET
software) to Analyze format for SPM.
I've tried XMedCon and MriCro with no success. XMedCon produced Analyze
images, but the voxel intensity was unknown and the voxel size was wrong
(1x1x1). When using MriCro it was mentioned that the image is 32-bit
unsigned integer data and the conversion didn't even start.
Does anyone know a free converter software (other than XMedCon or
MriCro) for this purpose?
Below is a description of the file format of images.
Thanks in advance,
Esa Wallius
Tampere University of Technology, Finland
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5.1 File formats
The PARAPET utility and reconstruction programmes frequently need to
read and write files of image and projection data. Files formats are
encountered in which data and header information are maintained in
separate files (e.g. interfile). In other formats, data files carry
header information (e.g. the native GE Advance sinogram format). The
most comprehensively supported file format in the library is
interfile. More details about this type can be found on
http://www.cu.mrc.ac.uk/~kris/. It is currently the only format
supported for writing. Projection data files are written in pairs
projdata_filename.hs projdata_filename.s where projdata_filename.hs is
the header text file and projdata_filename.s is the data file.
Similarly, image files are written as a pair of files
image_filename.hv image_filename.v where image_filename.hv is the
header text file and image_filename.v is the data file. In addition,
we currently write a .ahv file which uses (old) Interfile 3.3
conventions, with a tweak for the AnalyzeTM programme. The native GE
Advance sinogram format is supported for reading, however data files
must have maximum ring difference 11 and contain 281 bins * 256
segments * 336 views.
A utility is available (see Section 5.4.2) for converting ECAT6 to
interfile. (shortly, we shall provide support for ECAT7, as well).
When a file must be specified for reading in a utility or
reconstruction programme, the name of the header file should be given
(if available). If the name of a data file is given the software's
file reading routines will look for a prepended header. Failing to
find one, it will prompt the user for the required information.
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