thanks, all this information it's going to be really helpfull
thank you very much
aida
2012/12/21 Xavi Planes <[email protected]>
> Hi Aida,
>
> I found the cause of the conversion of the image pixel type to float.
> The ITK Nifty reader checks if the image needs to be rescaled using the
> member variable RescaleScope. The value of this variable is 0.0045 for your
> image and then the image is rescaled. For rescaling the image, the pixel
> type needs to be changed to float. This is the piece of code from the file
> itkNiftiImageIO.cxx:
>
> // if rescale is necessary, promote type reported
> // to ImageFileReader to float
> if(this->MustRescale())
> {
> if(this->m_ComponentType == CHAR ||
> this->m_ComponentType == UCHAR ||
> this->m_ComponentType == SHORT ||
> this->m_ComponentType == USHORT ||
> this->m_ComponentType == INT ||
> this->m_ComponentType == UINT ||
> this->m_ComponentType == LONG ||
> this->m_ComponentType == ULONG)
> {
> this->m_ComponentType = FLOAT;
> }
> }
>
> I hope this can help you. However, if you want to know more details
> maybe you could contact ITK mailing list.
>
> Best regards,
> Xavi
>
>
> 2012/12/21 Aida Ninyerola <[email protected]>
>
>> Hi,
>>
>> We have an output image from SPM8 that we have opened with GIMIAS. It's a
>> niifti format but with separated hdr + img files.
>>
>> When we check the data information we find that data type is float. But
>> checking the same image with mricro it says that it's a 16-bit int image.
>> We have also check the dimensions of the img file and it matches with
>> 16-bit int data type. But if you take a look to the different intensity
>> values you find that they are decimal values.
>>
>> We don't know what to think about. Maybe it's a problem from spm or a
>> problem from the other two programs. The fact is that we need to know this
>> data type as it's going to be necessary for later processing processes.
>>
>> If you need this image, I can send it.
>>
>> Thank you very much for your attention,
>> Aida
>>
>>
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>
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