Transactional undo & audit log

Roll back batched changes and review a timestamped log of every modification.

Problem

During a DICOM editing session, you make a mistake — you accidentally modify the wrong tag or apply an anonymization profile you didn’t intend to. You need a reliable undo system that tracks every edit as a transaction, lets you revert step-by-step, and supports redo in case you undo too far. The dirty counter in the top bar tracks the net number of uncommitted modifications.

Steps

Edit → Undo → Redo Cycle

1. Open a file (⌘O) and switch to Edit mode (⌘3).

2. Edit a tag — double-click Patient Name, change it to EDITED^PATIENT, save. The row turns gold, dirty counter shows “1 modified”.

3. Undo — click the Undo button (⌘Z) in the metadata toolbar. The tag reverts to its original value, gold highlight disappears, dirty counter clears.

4. Redo — click the Redo button (⌘Shift+Z). The edit is re-applied, gold highlight and counter return.

SQ Sequence Edits

5. Remove a sequence item — in an RTSTRUCT file, filter for (FFFE,E000) (item delimiter rows), click ✕ on an item to remove it.

6. Undo — the removed item is restored. Item count returns to the original value.

7. Add a sequence item — click + on an SQ row. The item count increments (e.g. “1 items” → “2 items”).

8. Undo — the added item is removed, count reverts.

Dirty Counter

9. The dirty counter in the top bar (next to the command palette button) shows the net number of modifications. It appears when dirty > 0 and disappears on full undo.

Result

Every tag edit, sequence-item change, structural split/merge, and anonymization run becomes an undoable transaction. ⌘Z steps back and ⌘⇧Z forward, the dirty counter tracks the net change, and undo preserves referential integrity — undoing a study split brings back the original Study Instance UID.