[Rtk-users] On the Reconstruction of CBCT

[Simon Rit]

Hi,
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 Wikipedia's
explanation on HU <https://en.wikipedia.org/wiki/Hounsfield_scale> for more
information.
Simon

On Wed, Nov 1, 2023 at 5:29 PM 、 <1721534574 at qq.com> wrote:

> Hello,
> 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,
> zou
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