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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hello Chasan,<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The VTK DICOM readers already take the Rescale Slope and
Intercept values into account.&nbsp; The voxel values from DICOMReader are already
in HU so the offset should not be applied.<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The definition of Rescale Slope and Rescale Intercept can be
found in the DICOM Standard Part 3:<o:p></o:p></span></p>

<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span
style='mso-list:Ignore'>&middot;<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Rescale Intercept&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (0028,1052)<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#244061'>The
value b in relationship between stored values (SV) and the output units.&nbsp; Output
units = m*SV+b<o:p></o:p></span></p>

<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span
style='mso-list:Ignore'>&middot;<span style='font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Rescale Slope&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; (0028,1053)<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#244061'>m in
the equation specified in Rescale Intercept (0028,1052).<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; --
Scott<o:p></o:p></span></p>

<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

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<p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> vtkusers-bounces@vtk.org
[mailto:vtkusers-bounces@vtk.org] <b>On Behalf Of </b>Chasan KIOUTSOUKMOUSTAFA<br>
<b>Sent:</b> Thursday, August 26, 2010 8:17 AM<br>
<b>To:</b> vtk mailList<br>
<b>Subject:</b> [vtkusers] Hounsfield Units of Human body part<o:p></o:p></span></p>

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<p class=MsoNormal><o:p>&nbsp;</o:p></p>

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    <p class=MsoNormal>Hi all<br>
    &nbsp;I'm trying to get iso surfaces of a human-body parts such as ( bone,
    liver, muscle, skin) from DICOM datasets. For extraction of iso surfaces,
    I'm using the MarchingCubes algorithm, and it needs the Hounsfield Unit
    (HU) for extraction. I've found many <b>different</b> HU scales for human
    body parts. My questions are;<br>
    1. In DICOM tags, there is a value called &quot;RescaleIntercept&quot; what
    exactly it is ? <br>
    is it an offset of CT dataset ? and if it is for example -1000, so what is
    the real HU of water for -1000 value ?<br>
    <br>
    HUofBone = (double)DicomReader-&gt;GetRescaleOffset() + 1200.0;<br>
    boneExtractor-&gt;SetInputConnection(Dicomreader-&gt;GetOutputPort());<br>
    boneExtractor-&gt;SetValue(0, HUofBone);<br>
    <br>
    In the given code, what GetRescaleOffset returns ?&nbsp; <br>
    <br>
    <br>
    <br>
    <br>
    <br>
    Chasan KIOUTSOUKMOUSTAFA<o:p></o:p></p>
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  <p class=MsoNormal><br>
  <br>
  Chasan KIOUTSOUKMOUSTAFA<o:p></o:p></p>
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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Calibri","sans-serif"'><o:p>&nbsp;</o:p></span></p>

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