[vtkusers] Byte array from a Dicom Image

[Matias Montroull]

One more thing, I noticed the data type is "short", so how I get the values
in that case?


On Fri, Jan 24, 2014 at 10:25 PM, Matias Montroull <matimontg at gmail.com>wrote:

> Thanks David,
>
> So, I've done this and works perfect:
>
>                     vtkDICOMImageReader reader = vtkDICOMImageReader.New();
>                     reader.SetFileName(@"C:\DICOM\img1.dcm");
>                     reader.Update();
>                     vtkImageData vtkimagedata_imagen = reader.GetOutput();
>                     vtkDataArray array_bytes =
> vtkimagedata_imagen.GetPointData().GetScalars();
>                     vtkUnsignedShortArray ushortArray_imagen =
> vtkUnsignedShortArray.New();
>                     ushortArray_imagen.DeepCopy(array_bytes);
>                     int[] abc = new int[array_bytes.GetDataSize()];
>                     for (int i = 0; i < array_bytes.GetDataSize(); i++)
>                     {
>                         abc[i] = ushortArray_imagen.GetValue(i);
>                     }
>
> One more question, is it possible to re-create a Dicom Image from an
> ushort Array?
>
> Thanks again,
>
> Matias.
>
>
> On Fri, Jan 24, 2014 at 8:24 PM, David Gobbi <david.gobbi at gmail.com>wrote:
>
>> Hi Matias,
>>
>> If you have a vtkImageData object, you can get the array though
>> VTK's abstract data set interface.  Here's an example:
>>
>> vtkImageData *image = reader->GetOutput();
>> vtkDataArray *array = image->GetPointData()->GetScalars();
>>
>> This will return an array that contains the scalars that are
>> associated with each point in the data.  For vtkImageData, this
>> means the length of the array is the number of pixels in the image,
>> so the length will be 262144 (which is 512*512).
>>
>> If the data is DICOM, the array will probably already be either a
>> vtkUnsignedShortArray or a vtkShortArray (signed short).  But to
>> be sure, you can do a conversion:
>>
>> vtkUnsignedShortArray *ushortArray = vtkUnsignedShortArray::New();
>> ushortArray->DeepCopy(array);
>>
>> With the ushort array, you can use GetValue(i) to get one of the values.
>>
>>   David
>>
>>
>>
>> On Fri, Jan 24, 2014 at 3:46 PM, Matias Montroull <matimontg at gmail.com>
>> wrote:
>> > Hi,
>> >
>> > is there a way to obtain the byte array from a Dicom Image?
>> >
>> > I can display the image but I also need to extract the byte data, it's a
>> > 512X512 16 bits image, so I need the Ushort array.
>> >
>> > Thanks!
>>
>
>
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