Some Examples of Wavelet Image Data Compression

The image data, which was originally in DICOM (dcm) format was transferred into the Picos workstation. On this workstation, we wavelet-compressed each image at different compression rates.
In order to make the extracted data accessible to the public, we converted it into JPG, taking care not to apply an additional compression.

CT of the Petrous Bone

The CT of the petrous bone (1a) has a very high contrast (bone vs. soft tissue).
Compression at a rate of 1:30 (1b) does not yield any immanent data loss; the image retains its full diagnostic quality. In direct comparison with the lossless image one can detect a slight influence of the wavelet compresstion when looking closely at the signal noise.
At a compression rate of 1:50 (1c) high contrast tissue (i.e. the bone structure) still does not get distorted, whereas the soft tissue structures, which are not of diagnostic interest in this case, (besides, they partly suffer noise in their own right) begin to show the typical blurring of the wavelet artifacts.


CT of the Cervical Spine

The CT of the cervical spine and the abdominal CT are images with a medium contrast and a high signal to noise ratio. This kind of image data can be compressed at a rate of 1:20 to 1:25 without loss of its diagnostic quality.
With higher compression rates (2c, 2d, 3c, 3d), the artifacts become apparent in the soft tissue.

Abdominal CT


CT of the Head

With the CT of the head we exemplify the influence of the wavelet compression in a low contrast environment; please see the extra page.

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