Most professional medical imaging companies use the Accusoft Pegasus PICTools libraries.
They provide the fastest, and most standard compression and decompression for all DICOM lossy and lossless formats such as JPEG 2000, Lossless JPEG, JPEG-LS, and others.
IF speed is required, nothing will compare.
If you're deploying on Windows, ImageGear .NET or ImageGear Pro will give you easy-to-use environments with full support for DICOM dcm files.
You can also use ImagXpress for Windows development.
