Extended field of view

Extended field of view (EFOV) is a technique that allows the sonographer to slowly scan over a large area with their rectangular linear array transducer.   As the sonographer slowly slides the transducer over the region of interest the computer acquires a series of image frames and then stitches the individual frames together to produce a "panoramic" image with a much larger field of view.

It is a very useful technique for obtaining  images of a large structure or for demonstrating the relationship between structures such as the relationship between the placenta and the cervix.  Some practice with this technique is required to make it useful.

Note: Extended field of view is NOT able to capture a panoramic image of a moving structure.  It is not used in echocardiography.

Most major manufacturers now offer this feature.   Siemens calls it Siescape.  GE calls it Logiq View.  Philips calls it Panoramic imaging.