User manual

Figure 2-14 – DICOM Save Study Compression Options
The compression techniques supported are:
noCompression – Save the image uncompressed.
jpeg2000Lossless – Save the image using jpeg2000 wavelet lossless
compression. The number of bits stored will automatically be the number
of bits in the image at the time of the image save. The compression ratio
to be expected is typically between 4 and 10 for jpeg2000 lossless
compression.
jpeg2000lossy – This compression technique utilizes jpeg2000 wavelet
lossy compression and achieves compression ratios between 10 and 70.
The uncompressed images appear lossless in quality with this
compression technique. JPEG2000 will perform 8, 12, and 16 bit
compression.
jpeglossless – This compression technique uses the common JPEG
lossless compression algorithms. The number of bits in the compressed
image can be set to 8, 12 or 16 bits. The compressed image typically
have a compression ratio of about 5 to one.
jpeglossy – 8 bit Process 1 – This is JPEG 8 bit lossy compression.
One can select a quality factor to control the quality and resulting c
ompression ratio. The default quality factor is 90 (quality factor is set
between 0 and 100). Rather good compression ratios can be achieved
with this compression technique but at the expense of image quality. The
uncompressed image will be 8 bit images of varying levels of acceptability.
jpeglossy – Process 2 & 4 – This is JPEG 12 bit lossy compression.
Like jpeg 8 bit lossy compression, the quality factor can be set between 0
and 100. All of the compression algorithms described above are DICOM
compliant and will be compatible with PACS servers supporting the
DICOM standard for compression.
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