What is a Mask Substraction Sequence used for ?

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alphabetagama
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Joined: Wed, 2006-03-08, 14:33

What is a Mask Substraction Sequence used for ?

#1 Post by alphabetagama »

Hello !

At the moment, I am working on Dicom multiframe images. But there is a tag in the header I don't understand.

This tag is called MaskSubtractionSequence (0028,6100). It defines a sequence of items, each item divided in 4 tags :
- 0028,6101 MaskOperation
- 0028,6102 ApplicableFrameRange
- 0028,6110 MaskFrameNumbers
- 0028,6114 MaskSubPixelShift

I have read the dicom doc and I still don't understand what is the role of these tags.

I need your help !
Thank you

Marco Eichelberg
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#2 Post by Marco Eichelberg »

Supposedly there are DICOM angiography images where the digital subtraction step must be done by the application. The application computes a mask image by performing the given operation (typically an averaging) on a number of frames of the image with a certain sub-pixel shift. The result is a mask image, and that is subtracted from all other frames of the angiography to create a DSA result image. However, we have never implemented that in practice and I have never seen any image where this could be applied.

alphabetagama
Posts: 2
Joined: Wed, 2006-03-08, 14:33

#3 Post by alphabetagama »

Thank you very much!
Now, I understand the role of this mask.

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