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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="divRplyFwdMsg" dir="ltr"><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>
<b>Sent:</b> Friday, April 22, 2022 4:00:17 AM<br>
<b>To:</b> gate-users@lists.opengatecollaboration.org <gate-users@lists.opengatecollaboration.org><br>
<b>Subject:</b> [Gate-users] Hounsfield units</font>
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<p class="x_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="x_ydpeef11c37MsoNormal"><span lang="EN-US">Best regards</span></p>
<p class="x_ydpeef11c37MsoNormal"><span lang="EN-US">Zahra</span></p>
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