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It's basically a cylinder oriented along the Y-axis. So it's easy to
check on the the geometry using the symmetries. I ran 2 simulations
with an analytically defined phantom and the same phantom in a
voxelized geometry to verify I obtain the same results!<br>
<br>
matrix: 160x50x160 (XxYxZ)<br>
pixel size: 1mm<br>
<br>
-- Corinne<br>
<br>
dimitris wrote:
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<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;">Hi Corinne,<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;" lang="EN-GB">Can
you give us an idea of the size of your <span class="SpellE"><span
class="GramE">voxels</span></span><span class="GramE">.</span> We had
a similar problem but the shift was quite big. In
our case we had to displace the phantom in the macro to get it in the
right
position, <span class="SpellE">ie</span> in the centre of the FOV.<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;" lang="EN-GB"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;" lang="EN-GB">Cheers<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;" lang="EN-GB"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;" lang="EN-GB">Dimitris<o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;" lang="EN-GB"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;" lang="EN-GB"><o:p> </o:p></span></font></p>
<p class="MsoNormal"><font color="navy" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial; color: navy;" lang="EN-GB"><o:p> </o:p></span></font></p>
<div>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Dimitris Visvikis, </span></font><span
style=""><o:p></o:p></span></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">U650 INSERM,</span></font><span
style=""><o:p></o:p></span></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Laboratoire de Traitement
d'Information Medicale,</span></font><span style=""><o:p></o:p></span></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Equipe 'Quantification en
Tomographie d'Emission',</span></font><span style=""><o:p></o:p></span></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">CHU Morvan,</span></font><span
style=""><o:p></o:p></span></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">5 avenue Foch,</span></font><span
style=""><o:p></o:p></span></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">29609 Brest,</span></font><span
style=""><o:p></o:p></span></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">France</span></font><span
style=""><o:p></o:p></span></p>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt;"> <o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Tel: +33 (0)298 018114</span></font><span
style=""><o:p></o:p></span></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">Fax: +33 (0)298 018124</span></font><span
style=""><o:p></o:p></span></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">e-mail: <a
href="mailto:dimitris@univ-brest.fr">dimitris@univ-brest.fr</a></span></font><span
style=""><o:p></o:p></span></p>
<p class="MsoNormal"><font color="black" face="Arial" size="2"><span
style="font-size: 10pt; font-family: Arial;">website:
latim.univ-brest.fr</span></font><span style=""><o:p></o:p></span></p>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt;"> <o:p></o:p></span></font></p>
<p class="MsoNormal"><font color="black" face="Times New Roman"
size="3"><span style="font-size: 12pt;"> </span><o:p></o:p></font></p>
</div>
<p class="MsoNormal" style="margin-left: 35.4pt;"><font color="black"
face="Tahoma" size="2"><span
style="font-size: 10pt; font-family: Tahoma; color: windowtext;"
lang="EN-US">-----Original Message-----<br>
<b><span style="font-weight: bold;">From:</span></b>
<a class="moz-txt-link-abbreviated" href="mailto:gate-devel-bounces@lphe1pet1.epfl.ch">gate-devel-bounces@lphe1pet1.epfl.ch</a>
[<a class="moz-txt-link-freetext" href="mailto:gate-devel-bounces@lphe1pet1.epfl.ch">mailto:gate-devel-bounces@lphe1pet1.epfl.ch</a>] <b><span
style="font-weight: bold;">On
Behalf Of </span></b>Corinne J Groiselle<br>
<b><span style="font-weight: bold;">Sent:</span></b> vendredi 20 août
2004
03:14<br>
<b><span style="font-weight: bold;">To:</span></b> GATE developer
mailing list;
GATE feedback and helpline for users<br>
<b><span style="font-weight: bold;">Subject:</span></b> [gate-devel]
voxelized
phantom</span></font><span style="" lang="EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left: 35.4pt;"><font color="black"
face="Times New Roman" size="3"><span style="font-size: 12pt;"
lang="EN-GB"><o:p> </o:p></span></font></p>
<p class="MsoNormal"
style="margin-right: 0cm; margin-bottom: 12pt; margin-left: 35.4pt;"><font
color="black" face="Times New Roman" size="3"><span
style="font-size: 12pt;">Hello,<br>
<br>
I ran a simulation with a voxelized phantom (interfile format). It's
centered
in the Z direction but when I look at the root output, I see a 1.5
pixels
shift.<br>
<br>
Did someone already noticed something similar? I verified and the
phantom is
centered within the matrix.<br>
<br>
Thanks for your help,<o:p></o:p></span></font></p>
<div>
<p class="MsoNormal" style="margin-left: 35.4pt;"><font color="black"
face="Times New Roman" size="3"><span style="font-size: 12pt;">--
Corinne<br style="">
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<p class="MsoNormal" style="margin-left: 35.4pt;"><font
color="#666666" face="Times New Roman" size="2"><span
style="font-size: 10pt; color: rgb(102, 102, 102);">Corinne J.
Groiselle, PhD</span></font><o:p></o:p></p>
<p class="MsoNormal" style="margin-left: 35.4pt;"><font
color="#666666" face="Times New Roman" size="2"><span
style="font-size: 10pt; color: rgb(102, 102, 102);">Research
instructor<br>
<br>
Division of Nuclear Medicine / Department of Radiology <br>
University of Massachusetts Medical School <br>
55 Lake Avenue North<br>
Worcester, MA 01655<br>
USA<br>
<br>
<u>phone</u>: (508)-856-6123 - <u>fax</u>: (508)-856-4572<br>
<u>e-mail</u>: <a href="mailto:Corinne.Groiselle@umassmed.edu">Corinne.Groiselle@umassmed.edu</a>
<br>
<u>professional homepage</u>: <a
href="http://users.umassmed.edu/corinne.groiselle">http://users.umassmed.edu/corinne.groiselle</a><br>
<u>personal homepage</u>: <a href="http://corinne.groiselle.free.fr">http://corinne.groiselle.free.fr</a></span></font><font
color="#666666"><span style="color: rgb(102, 102, 102);"> <o:p></o:p></span></font></p>
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style="margin-right: 0cm; margin-bottom: 12pt; margin-left: 35.4pt;"><font
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<hr style="width: 100%; height: 2px;"><font
style="color: rgb(102, 102, 102);" size="-1">Corinne
J. Groiselle, PhD</font><font style="color: rgb(102, 102, 102);"
size="-1"><br style="font-family: times new roman,times,serif;">
</font></div>
<div
style="text-align: left; font-family: times new roman,times,serif; color: rgb(102, 102, 102);"><font
size="-1">Research instructor<br>
<br>
Division
of Nuclear Medicine / Department of Radiology <br>
University
of Massachusetts Medical School <br>
55 Lake
Avenue North<br>
Worcester, MA 01655<br>
USA<br>
<br>
<u>phone</u>:
(508)-856-6123 - <span style="text-decoration: underline;">fax</span>:
(508)-856-4572<br>
<u>e-mail</u>:
<a class="moz-txt-link-abbreviated" href="mailto:Corinne.Groiselle@umassmed.edu">Corinne.Groiselle@umassmed.edu</a> <br>
<u>professional
homepage</u>: <a class="moz-txt-link-freetext" href="http://users.umassmed.edu/corinne.groiselle">http://users.umassmed.edu/corinne.groiselle</a><br>
<u>personal
homepage</u>: <a class="moz-txt-link-freetext" href="http://corinne.groiselle.free.fr">http://corinne.groiselle.free.fr</a></font> </div>
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