Hi everybody,understand how to read these COLOR PALETTE values.
I'm running a small software project featuring the display of DICOM files. New topic is to read and display eye care Corneal Topography Map images as defined by supplement 168. However, this SOP class gives me some head aches as I do not fully
As far as I understand the supplement, corneal topography maps are of circular shapes where the outer areas of the image do not belong to the "payload" and are more like a padding to the rectangular boundary of the image. See the center image of http://dicom.nema.org/medical/dicom/current/output/chtml/part03/sect_C.8.30.3.html#figure_C.188.8.131.52-2 as an example.
I wonder how to distinguish these "padding" pixels from those pixels that contain topography map information, especially when it comes to superimposing such maps onto real images and keeping the outer ares transparent. The supplement defines to storesuch images with photometric interpretation COLOR PALETTE where each pixel value is an index for the palette lookup table. Every pixel value less than the smallest LUT index shall be mapped to the first entry of the LUT, every pixel value greater than
So, how does implementers of this SOP class handle the "non-payload" pixel? Do they define an additional color in the palette (e.g. black)?
Furthermore, until now I did not find any sample images/instances of this SOP class. Is anybody aware of Corneal Topography Map SOP instances, which might work as a reference for me?
Thanks to the group and best regards
Hi David,be only applied to grayscale images with photometric interpretation of MONOCHROME1 or MONOCHROME2. Not sure whether this explanation means "Shall not be used for any other photometric interpretation" or "May also be used for e.g. COLOR PALETTE images as
thanks for your response. Pixel Padding Value (0028,0120) looks exactly like what I was searching for. However, after checking the further explanations in chapter "C.184.108.40.206.2 Pixel Padding Value and Pixel Padding Range Limit" this attribute seems to
So, how does implementers of COLOR PALETTE images handle this PaddingPixel use case? Is there any sample implementation/images available?
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