Compress images

General
1

Hello, good morning.
I wanted to ask how to compress the images or lower the resolution. Let me explain my problem.
My mammogram images are around 16-20 MB, and they’re very large and causing problems with the viewer. I tried:
“IngestTranscoding”: “1.2.840.10008.1.2.4.70”,
“IngestTranscoding”: “1.2.840.10008.1.2.4.80”
“IngestTranscoding”: “1.2.840.10008.1.2.4.90”,
But I couldn’t get them to less than 11 MB.
I wanted to know how I can do this or resolve this. What alternative do I have?
For example, I see in this link, OHIF Viewer , that mammograms are 4 MB in size. How can I get this?

Greetings, everyone.
orthanc.json (5.5 KB)

2

Hello,

It is not surprising that lossless compression schemes such as JPEG-LS and JPEG2000 typically achieve only 30% to 50% compression on medical images, given that these images often use a bit depth equal or greater than 10 bits per pixel.

Regarding the public OHIF images, I cannot provide any insight, as I cannot find a way to download the raw DICOM files. My guess is either that their resolution is smaller than your mammograms, that their bit depth equals 8 bits per pixel, or that they use a destructive compression (such as JPEG).

Regards,
Sébastien-

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