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<div class="moz-cite-prefix">The normalization datafile should
contain as many events as the number of possible lines-of-response
that may record coincidences.<br>
<br>
So at a certain point, you should start from the sinogram of
normalization coefficients provided by Philips and create one
"normalization event" per sinogram bin to build the normalization
data file. You must know the corresponding crystals-pair for each
sinogram bin and write it in the event.<br>
<br>
So prompt coincidences have nothing to do with the sensitivity
image computation here.<br>
<br>
If you are using your list-mode events to build the normalization
datafile, this is normal that you get an object in your
sensitivity image.<br>
It is simply as if you backprojected all your events.<br>
<br>
Simon<br>
<br>
Le 23/07/2018 à 15:50, Julien Salvadori a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:CAMXir1nOV_EdC0RaKRJmMjfq1_rHohj1Xk4DFHrFhmVLynFegA@mail.gmail.com">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<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" moz-do-not-send="true">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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