[ITK] An important question about intensity rescale of dicom images

[Lambert Zijp]

Hi Tommi,

If those images are CT, it might be that the pixelvalues are converted to
Hounsfield units: the pixelvalues are shifted so that 'air' equals -1000.
Using the reader with *signed short* would then solve your problem.

Greetings,
Lambert

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On Mon, Mar 28, 2016 at 5:45 AM, penitentepid epid <penitentepid at gmail.com>
wrote:

> Hi, ITK group
>
> I have bunch of 12 bits dicom images whose intensity ranges from 0 to
> 4095. (found in dicom header, bitsStoed =12, highBits = 11, pixel
> representation = 0)
> when i used image reader <unsigned short,2>, i got a image whose pixel
> intensity are ranging from 0 to 65535. why does this happen? i mean i
> understand unsigned short is in this range, but did itk internally rescale
> image intensity somehow?
>
> why not put highest of pixel intensity as it suppose to be (4095 in this
> case), and leave rest bits to be zeroes..
>
> tommi.
>
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