Synchronization: Pre- vs Post-Operative

OsiriX and Horos Course · MPR and Centerline

In this lesson I show how to synchronize images in OsiriX to compare two studies side by side, such as a preoperative and a postoperative study (example: abdominal aortic/iliac aneurysm). The idea is to open both series (usually the arterial phase) and synchronize the slices using an anatomical reference point (such as the celiac trunk). 1) Method 1: open two datasets in the 2D Viewer (selection with Command) In the database, expand the studies/datasets (small arrow/triangle next to them) Select the preoperative arterial dataset Hold Command and select the postoperative arterial dataset Open them in the 2D Viewer so that two windows appear at the same time At this point, they are not yet synchronized: moving one does not move the other. To synchronize: Find the same point in both studies (in the video, I use the celiac trunk) With both studies at the same level, click the synchronization button (Sync) Done: when you scroll through one study, the other follows automatically. 2) Method 2: open one study and then open the other (Window → Database) Open the first study (double-click) Go to Window → Database to return to the database Open the second study (double-click) — it opens next to the first one Repeat the same process: Align by an anatomical landmark (e.g., celiac trunk) Click Sync 3) Important note When you open two datasets within the same study (e.g., non-contrast and arterial), they often come already synchronized automatically, because the CT scanner itself organizes the series as synchronized within the study.