<div class="__aliyun_email_body_block"><div  style="clear:both;"><p  class="MsoNormal" style="margin:.0px;text-align:justify;font-size:14.0px;font-family:等线;">Dear CASToR developers and users,</p><p  class="MsoNormal" style="margin:.0px;text-align:justify;font-size:14.0px;font-family:等线;">  I have been facing
an issue with attenuation when trying to reconstruct a PET image from GATE
simulation data, and my simulation item is a 200mm-diameter water cylinder. As
shown in the attachment: "clinder.png", obvious attenuations can be
seen in the recon image, so I need to apply attenuation correction by providing
the MuMap file with the help of "-atn XXX" in castor-recon.</p><p  class="MsoNormal" style="margin:.0px;text-align:justify;font-size:14.0px;font-family:等线;">  I have already
obtained MuMap file ("BrainPET_atn_Water-MuMap.raw" in attachment)
and its header ("BrainPET_atn_Water-MuMap.mhd") from MuMapActor in
GATE. submitted the header file into castor-recon using the following commands:
"castor-recon -df /home/castor/workDir/Cdf/Clinder_b2b_WaterPhantom.Cdh
-atn /home/castor/workDir/atn/BrainPET_atn_Water-MuMap.mhd   -opti MLEM -it 10:9 -proj joseph -conv
gaussian,1.7,1.7,3::psf  -dim
630,630,40  -vox 0.3225,0.32255,0.3225   -dout
/home/castor/workDir/img/waterClinder_forAttenuation -th 0"</p><p  class="MsoNormal" style="margin:.0px;text-align:justify;font-size:14.0px;font-family:等线;">  But errors were
shown on screen, as provided in the attachment: "output.png". I guess
it is because I did not offer the image header file in the correct format as
CASToR required. Can anyone tell me where can I find an example of attenuation
image header file, so I can write the MuMap header correctly.</p><p  class="MsoNormal" style="margin:.0px;font-size:14.0px;font-family:等线;text-align:left;">Best
regards</p><p  class="MsoNormal" style="margin:.0px;font-size:14.0px;font-family:等线;text-align:left;">Xin
Zhao</p><pre  style="color:#000000;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;text-align:start;text-indent:.0px;text-transform:none;widows:2;text-decoration-thickness:initial;text-decoration-style:initial;text-decoration-color:initial;"><br ></pre></div><br><br>    <div class="__aliyun__bigattach" style="padding:1px;color:#333;font-size:12px;border:1px solid #C1D9F3;margin:5px 10px;">
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