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https://www.dicomstandard.org/ is the only official website to go to, when wanting to know more about the latest and previous specifications of the DICOM Standard.
https://gammagurus.com/: Australian & New Zealand distributors of high quality products in Radiotherapy, Diagnostic Imaging, Medical Physics & Research. Gamma Gurus has been promoting the DICOM Training/Workshops in Australia since 2016 and has proven itself to be a reliable partner.
https://mirth-support.com/training: when in need for a Mirth Connect training, check out this website.