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<div dir="ltr" data-setdir="false">Thank you Mahdjoub</div><div dir="ltr" data-setdir="false">I was checking using Image j and it shows the units start from negative values. My Dicom image is for the head and the sinus cavity (density:<span>0.205 <span>g/cm3) Hounsfield unit value is -800. </span></span> So I can start from negative units in my Gate program, not from zero</div><div dir="ltr" data-setdir="false">Zahra</div><div dir="ltr" data-setdir="false"><br></div>
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On Friday, April 22, 2022, 12:09:07 PM GMT+2, Mahdjoub Hamdi <mahdjoub.hamdi@hotmail.fr> wrote:
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Hi Zahra, </div>
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Make sure you read the whole data, not only the positive part using Matlab. ImageJ software also reads dicom images. Just go File->import->image sequence then select the folder where your dicom data is living, then you can check if the voxel values in the lungs
are ~1000 HUs. </div>
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I hope it helps.</div>
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Thanks, </div>
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Mahdjoub</div>
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<div id="yiv2406112676yqt28831" class="yiv2406112676yqt3139228786"><div dir="ltr" id="yiv2406112676divRplyFwdMsg"><font face="Calibri, sans-serif" style="font-size:11pt;" color="#000000"><b>From:</b> Gate-users <gate-users-bounces@lists.opengatecollaboration.org> on behalf of zahra ahmadi <z_ahmadi263@yahoo.com><br clear="none">
<b>Sent:</b> Friday, April 22, 2022 4:00:17 AM<br clear="none">
<b>To:</b> gate-users@lists.opengatecollaboration.org <gate-users@lists.opengatecollaboration.org><br clear="none">
<b>Subject:</b> [Gate-users] Hounsfield units</font>
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<p class="yiv2406112676x_ydpeef11c37MsoNormal"><span lang="EN-US">Dear all</span></p>
<div><span lang="EN-US">I have a CT image of the head and I want to import it to my Gate program.<span>
</span>I have calculated the Hounsfield units based on the material compositions and it starts from negative values.<span>
</span>When I check my CT image by MATLAB to see the Hounsfield units on the image, these units start from zero, and when I check with Amira software, it starts from negative values.<span>
</span>Do I have to start with negative units or I should shift these values and start from zero to use them in the gate program?<span>
</span>What do you suggest to me to make sure<span> </span>I choose the right way to use in my gate program?</span></div>
<p class="yiv2406112676x_ydpeef11c37MsoNormal"><span lang="EN-US">Best regards</span></p>
<p class="yiv2406112676x_ydpeef11c37MsoNormal"><span lang="EN-US">Zahra</span></p>
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