<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML dir=ltr><HEAD><TITLE>Interfile format for STIR</TITLE> <META http-equiv=Content-Type content="text/html; charset=us-ascii"> <META content="MSHTML 6.00.2900.3268" name=GENERATOR></HEAD> <BODY> <DIV dir=ltr align=left>Dear Kris,</DIV> <DIV dir=ltr align=left> </DIV> <DIV dir=ltr align=left>Thanks for your answer for my question. </DIV> <DIV dir=ltr> </DIV> <DIV dir=ltr>that's weird. I haven't seen anything and can't immediatelly find anything in the mailing lists archive</DIV> <DIV> I realized that the email address I found on the web site  <A href="http://stir.sourceforge.net/">http://stir.sourceforge.net/</A>  (<A href="mailto:stir-users@lists.sourceforge.net">stir-users@lists.sourceforge.net</A>) is not the correct one. I will be more specific about what I am trying to do for attenuation correction. We have data of a voxellized phantom simulated with an interfile of a CT scan using GATE and we want to reconstruct the data.  What I thought that I need to do for attenuation correction as a part of precorrection using "correct_projdata" is to use the interfile of a CT scan used for the simulation as input of "attenuation image filename". So I simply copied the example of an interfile header file you sent to me and changed the file name for "name of data file" and matrix sizes and scaling factors to be correct for the interfile of a CT scan. Then I ran "manip_image" to see whether that simple changes work.  It did not work and I have gotten the following message WARNING: Interfile Warning: only 'type of data := PET' supported. WARNING: read_data: error after reading from stream. WARNING: read_interfile_image: error reading data or scale factor returned by read_data not equal to 1 ERROR: DiscretisedDensity::read_from_file: test.hv seems to be in an unsupported file format I am wondering whether plugging the CT scan still works for "correct_projdata" even though "manip_image" does not work or an interfile of a CT scan cannot be used as input for STIR.  I tried to "manip_image" with an interfile of a PET scan and I did not get the above error message.   Here is the header file I used for "manip_image" !INTERFILE  := name of data file :=  m000-sel_CT_scan_bigVox.i33 !GENERAL DATA := !GENERAL IMAGE DATA := imagedata byte order := LITTLEENDIAN number format := float !number of bytes per pixel := 4 number of dimensions := 3 matrix axis label [1] := x !matrix size [1] := 128 scaling factor (mm/pixel) [1] := 3.90625 matrix axis label [2] := y !matrix size [2] := 128 scaling factor (mm/pixel) [2] := 3.90625 matrix axis label [3] := z !matrix size [3] := 21 scaling factor (mm/pixel) [3] := 1.27999 number of time frames := 1 image scaling factor[1] := 1 data offset in bytes[1] := 0 quantification units := 1 !END OF INTERFILE := Thanks,   Hyejoo</DIV> <pre wrap> ===================================================================== Please note that this e-mail and any files transmitted with it may be privileged, confidential, and protected from disclosure under applicable law. If the reader of this message is not the intended recipient, or an employee or agent responsible for delivering this message to the intended recipient, you are hereby notified that any reading, dissemination, distribution, copying, or other use of this communication or any of its attachments is strictly prohibited. If you have received this communication in error, please notify the sender immediately by replying to this message and deleting this message, any attachments, and all copies and backups from your computer. </pre></BODY></HTML>