<div dir="ltr">Thank you Simon for the quick reply. <div><br></div><div>I disabled the attenuation and normalization in the calculation of the sensitivity and i always get strictly the same result. To make sure, i also reiterated the sensitivity computation by forcing the variable lor_sensitivity to 1 in the ProcessThisLine function of oSensitivityGenerator, with again the same result !</div><div><br><div>Indeed,i use prompt coincidences to generate the normalization datafile, it's not what is necessary to do ? and yes normalization coefficients are provided by Philips.</div><div><br></div><div>Julien</div></div></div><div class="gmail_extra"><br><div class="gmail_quote">2018-07-23 10:40 GMT+02:00 Simon Stute <span dir="ltr"><<a href="mailto:simon.stute@cea.fr" target="_blank">simon.stute@cea.fr</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<div class="m_-3617150634576873456moz-cite-prefix">Hi Julien,<br>
<br>
Looking at the SensiNorm, you are taking normalization and/or
attenuation into account, because we can see your object in the
sensitivity image.<br>
If you really want to disable it, even if it is present in your
normalization data file, just use the "-ignore-corr attn,norm"
option, as you did in the reconstruction.<br>
Otherwise, the attenuation is still present in the sensitivity
image, even if you ask for ignoring it in the reconstruction, as
you provide the sensitivity image.<br>
I suggest you try this, until you get an almost similar image to
the one built with the scanner elements.<br>
<br>
Also, when looking at the SensiNorm, it is quite noisy and we can
see the inserts which looks like as if you used the prompt data as
the normalization coefficients.<br>
I am wondering what kind of normalization coefficients are you
using ? Are you using the one provided by Philips ?<br>
<br>
Best<br>
Simon<div><div class="h5"><br>
<br>
<br>
<br>
<br>
Le 22/07/2018 à 17:18, Julien Salvadori a écrit :<br>
</div></div></div>
<blockquote type="cite"><div><div class="h5">
<div dir="ltr">
<p class="MsoNormal" style="margin:0cm 0cm 8pt;line-height:107%;font-family:Calibri,sans-serif"><span lang="FR">Dear Castor
users,</span></p>
<p class="MsoNormal" style="text-align:justify;margin:0cm 0cm 8pt;line-height:107%;font-family:Calibri,sans-serif">I can
reconstruct without problem
a list mode from an IEC phantom recorded on the Philips Vereos
TEP (with and
without correction) when the sensitivity is calculated from
the .geom scanner. However,
when the sensitivity is generated from a normalization file,
it does not work
anymore. I have no idea where the problem may come from,
especially since the
sensitivity image generated from the normalization file seems
correct to me.<span></span></p>
<p class="MsoNormal" style="text-align:justify;margin:0cm 0cm 8pt;line-height:107%;font-family:Calibri,sans-serif">Here in
attachement :</p>
<p class="MsoNormal" style="text-align:justify;margin:0cm 0cm 8pt;line-height:107%">
</p>
<p class="MsoNormal" style="font-family:Calibri,sans-serif;margin:0cm 0cm 8pt;font-size:small;text-decoration-style:initial;text-decoration-color:initial;line-height:13.91px">“SensiScan”
: Sensitivity calculated from the scanner element without
taking into account attenuation and normalization.</p>
<p class="MsoNormal" style="font-family:Calibri,sans-serif;margin:0cm 0cm 8pt;font-size:small;text-decoration-style:initial;text-decoration-color:initial;line-height:13.91px">“ReconWithSensiScan”
: MLEM reconstruction with sensitivity “SensiScan” without any
correction</p>
<p class="m_-3617150634576873456gmail-MsoListParagraph" style="font-family:Calibri,sans-serif;font-size:small;text-decoration-style:initial;text-decoration-color:initial;margin:0cm 0cm 8pt 36pt;line-height:13.91px"><span style="font-family:Wingdings"><span>è<span><span> </span></span></span></span>Gets
reconstructed images which seems to me coherent considering
the absence of correction<span></span></p>
<p class="MsoNormal" style="font-family:Calibri,sans-serif;margin:0cm 0cm 8pt;font-size:small;text-decoration-style:initial;text-decoration-color:initial;line-height:13.91px">“SensiNorm”:
Sensitivity calculated from the normalization datafile without
taking into account attenuation and normalization (attenuation
and normalization factor set to 1)<span></span></p>
<p class="MsoNormal" style="font-family:Calibri,sans-serif;margin:0cm 0cm 8pt;font-size:small;text-decoration-style:initial;text-decoration-color:initial;line-height:13.91px">ReconWithSensiNorm
: MLEM reconstruction with sensitivity “SensiNorm” without any
correction<span></span></p>
<p class="m_-3617150634576873456gmail-MsoListParagraph" style="font-family:Calibri,sans-serif;font-size:small;text-decoration-style:initial;text-decoration-color:initial;margin:0cm 0cm 8pt 36pt;line-height:13.91px"><span style="font-family:Wingdings"><span>è<span><span> </span></span></span></span>Gets
an almost uniform image with values very close to 0<span></span></p>
<p class="MsoNormal" style="font-family:Calibri,sans-serif;margin:0cm 0cm 8pt;font-size:small;text-decoration-style:initial;text-decoration-color:initial;line-height:13.91px">Do
you think that the sensitivity image calculated with the
normalization file seems correct? Have you ever encountered a
similar problem?</p>
<p class="MsoNormal" style="margin:0cm 0cm 8pt;text-decoration-style:initial;text-decoration-color:initial;line-height:13.91px"><font face="Calibri, sans-serif">Any help will be welcome!</font><br>
</p>
<p class="MsoNormal" style="font-family:Calibri,sans-serif;margin:0cm 0cm 8pt;font-size:small;text-decoration-style:initial;text-decoration-color:initial;line-height:13.91px">Kind
regards</p>
<p class="MsoNormal" style="font-family:Calibri,sans-serif;margin:0cm 0cm 8pt;font-size:small;text-decoration-style:initial;text-decoration-color:initial;line-height:13.91px">Julien
Salvadori</p>
<p class="MsoNormal" style="font-family:Calibri,sans-serif;margin:0cm 0cm 8pt;font-size:small;text-decoration-style:initial;text-decoration-color:initial;line-height:13.91px">Phd
student, IADI</p>
<p class="MsoNormal" style="font-family:Calibri,sans-serif;margin:0cm 0cm 8pt;font-size:small;text-decoration-style:initial;text-decoration-color:initial;line-height:13.91px"><br>
</p>
<p class="MsoNormal" style="font-family:Calibri,sans-serif;margin:0cm 0cm 8pt;font-size:small;text-decoration-style:initial;text-decoration-color:initial;line-height:13.91px"></p>
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