<div dir="ltr"><div>Hi,</div><div>If you calibrate correctly your acquired data, the reconstructed values are attenuation. To convert to HU, you need to find the attenuation of water and air and do the conversion yourself. You can check <a href="https://en.wikipedia.org/wiki/Hounsfield_scale">Wikipedia's explanation on HU</a> for more information.</div><div>Simon<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Nov 1, 2023 at 5:29 PM 、 <<a href="mailto:1721534574@qq.com">1721534574@qq.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div>Hello, </div><div>I reconstructed the mha format file using the fdk algorithm in the RTK package. I read the file through simpleITK and obtained its corresponding 3D matrix through the GetArrayFromImage() function. However, it is clear that the values in the 3D matrix are not their corresponding CT values (hu). I would like to inquire about how to convert the 3D matrix obtained from GetArrayFromImage() to the 3D matrix of CT value (hu), what function should be used, or what calculations should be performed?<br><br></div><div>BR,</div><div>zou</div>_______________________________________________<br>
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