Show DICOM standard violations

[irrer]

trafficstars

Show DICOM errors (bad date format, missing attribute, etc.).

Many simple errors can be caught trivially, and that alone might be helpful, but it is a slippery slope, as the full-blown set of rules is huge and complex. Users might mistakenly believe that if the program does not find errors, then their file is perfect, when in fact it is only checking some standards violations.