Proper tracking of the needle tip is vital for safe and effective ultrasound-guided cannulation. Follow these steps:

1. **Advance and Identify**: Begin advancing the needle under ultrasound guidance. Stop when the needle tip is visible on the screen.

2. **Move the Probe Away**: Gently slide the ultrasound probe away until the needle tip is out of view to avoid interference.

3. **Fix the Probe and Advance**: Keep the probe steady and advance the needle slightly.

4. **Re-Check the Needle Tip**: Reposition the probe until the needle tip is back in view.

5. **Repeat the Process**: Continue this sequence—advance the needle, move the probe, and re-check—until the needle tip is inside the target vessel.

6. **Confirm Placement**: Once the needle tip is centered in the vessel, switch to a longitudinal (in-plane) view to ensure it is correctly positioned within the lumen.

This iterative method minimizes the risk of blind advancement and enhances both patient safety and procedural success.