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<font face="Courier,serif"><font style="font-size: 10pt;">Dear all,</font></font></p>
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<font face="Courier,serif"><font style="font-size: 10pt;">We used the FirstReconstruction.cxx code with minor changes to reconstruct a digital breast tomosynthesis stack of projections acquired using a Hologic Selenia Dimenions system. Unfortunately, the reconstructed
image does not look as expected.</font></font></p>
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<span style="font-size: 10pt; font-family: Courier, serif;">The characteristics of the geometry of the system are that the detector remains stationary while the x-ray tube moves around a centre of rotation located at the detector (see attached diagram). The
changes </span><span style="font-size: 10pt; font-family: Courier, serif;">we made to FirstReconstruction.cxx so that it represents the Hologic Geometry are that the sdd and sourceOffesetY both vary as a function of the rotation of the source (sid*sin(angleTheta)
and sid*cos(angleTheta) respectively) while in all cases gantryAngle</span><span style="font-size: 10pt; font-family: Courier, serif;">= 0, sid = 700 mm and isox = -detectorWidth/2. Our geometry definition is:
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<font face="Courier, serif"><font style="font-size: 10pt;"><font color="#000000">geometry->AddProjection(700,sdd,</font><font color="#000080">0</font><font color="#000000">,-isox,0,</font><font color="#000080">0</font><font color="#000000">,</font><font color="#000080">0</font><font color="#000000">,</font><font color="#000080">0</font><font color="#000000">,sourceOffsetY);</font></font></font></p>
<p style="margin-bottom: 0cm; direction: ltr; widows: 2; orphans: 2;"><font face="Courier"><span style="color: rgb(0, 0, 0); font-size: 10pt; line-height: 14px; white-space: pre-wrap;">Please let me know if you have any ideas on what we might be d</span><span style="font-size: 13px; line-height: 14px; white-space: pre-wrap;">oing
wrong. </span></font></p>
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<span style="font-family: Courier; font-size: 13px;">Thank you for your help.</span></p>
<p style="margin-bottom: 0cm; direction: ltr; widows: 2; orphans: 2;"><font face="Courier" style="font-size: 13px;">Kind regards,</font></p>
<p style="margin-bottom: 0cm; direction: ltr; widows: 2; orphans: 2;"><span style="font-family: Courier; font-size: 13px;">Andria</span></p>
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