title: How do you register private DICOM tags?
body: <p>I would like to know how does a company (say Philips or Siemens) register private DICOM tags?</p>
  
  <p>I mean:</p>
  
  <ol>
  <li>How to ensure that the DICOM group is not taken by another manufacturer? Say Philips chooses the tags (1111, 00xx), so it needs to know that the group "1111" hasn't been taken.</li>
  <li>After that, does NEMA need to be involved? Or any other organization that regulates these private tags?</li>
  </ol>