Motion Organized Simultaneous Acquisition with Interactive Control for Real-Time

One robust and effective approach to suppressing motion artifacts is the real-time navigator method, which monitors motion and controls data acquisition accordingly in real-time. Most current navigator techniques are based on gating - they reconstruct images only using data acquired when motion is in a specified range. Effective motion suppression requires a narrow gating window that leads to a long scan time; hence all these techniques are fundamentally inefficient.

A team of Cornell radiologists exploited that wasted time, using it to acquire different image volumes (e.g right lung, heart, left lung; or three volumes of the same tissue) at different motion positions while maintaining the same residual motion for all volumes. They dubbed this process, motion organized simultaneous acquisition with interactive control (MOSAIC).

Navigator efficiency can be substantially increased using the MOSAIC algorithm by simultaneously acquiring multiple volumes at various motion positions. In general, efficiency increases as more volumes are acquired. The MOSAIC algorithm is simple and powerful and warrants a further investigation of wide application in thoracic and abdominal imaging.