US images - green overlay

[pacsadminat]

I searched a bit for similar reports, and found only one thread without much guidance:

http://www.pacsone.net/forum/viewtopic. ... 443878e640

Thumbnails are sometimes generated with a green overlay, and while it seems rare, I'd really like to prevent them from being displayed this way. If there is any new information regarding the original report of this issue, I'd be interested in learning about it!

[pacsone]

Are those US images compressed via the legacy JPEG (lossless or lossy) compression? If so, then the greenish hue is actually a well-known issue for the legacy JPEG-compressed color images, because the JPEG codec does not support the colorspace information, e.g., RGB, YCbCr, etc, which means the decoder of the JPEG-compressed pixel data would have to guess which colorspace the original/un-compressed pixel data was encoded, and if it guessed wrong the greenish hue would result.

If this is the case, you should ask the encoding application of those color US images to switch to the more recent JPEG2000 compression instead of the legacy JPEG, since the newer JPEG2000 compression supports the colorspace information in its encoded data stream, therefore eliminating any confusion about the colorspace when a decoder uncompress the encoded pixel data.

[pacsadminat]

I'll have to check to see if legacy JPEG is being used. To clarify, when you ask about the encoding application, do you mean the DICOM modality (a GE Voluson in this case) that originally sends the DICOM image?

That would make sense. The Voluson was very recently implemented, and lines up with the appearance of the green hue on the images.

Thanks for the quick response!

[pacsone]

when you ask about the encoding application, do you mean the DICOM modality (a GE Voluson in this case) that originally sends the DICOM image?

Yes, it's usually the US modality which encodes the acquired Dicom images.