<div dir="ltr">If you want to convert raw values to HU, you should use the formula <br><pre style="font-family: arial,helvetica,sans-serif;">HU = PixelValue * RescaleSlope + RescaleIntercept<br><br>Jothy<br></pre><br><div class="gmail_quote">
On Tue, Apr 13, 2010 at 8:06 PM, Scott Johnson <span dir="ltr"><<a href="mailto:Scott.Johnson@neuwave.com">Scott.Johnson@neuwave.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
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<p class="MsoNormal">Hi Folks,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">I’m reading a series of DICOM files from a directory
with code like this:</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: "Courier New";"> _reader=vtkDICOMImageReader::New();</span></p>
<p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: "Courier New";"> _reader->SetDirectoryName(directory.c_str());</span></p>
<p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: "Courier New";"> _reader->SetDataScalarTypeToUnsignedShort();</span></p>
<p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: "Courier New";"> _reader->Update();</span></p>
<p class="MsoNormal"> </p>
<p class="MsoNormal" style=""><span style="font-size: 10pt; font-family: "Courier New";"> cerr << <span style="color: rgb(163, 21, 21);">"Scalar
Type: "</span> << _reader->GetDataScalarType();</span></p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">How come the value of _<i>reader->GetDataScalarType is 4,
which is VTK</i>_SHORT?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">The files are CT which should be 12 bit unsigned data. When
I access the data I get negative values, which I don’t want. (I can’t
find code converting to Hounsfield units which could be negative.) How do I
get Unsigned Short data from vtkDICOMImageReader?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Thanks</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"> -- Scott</p>
<p class="MsoNormal"> </p>
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