AUTOMATIC CALIBRATION FOR 3-D FREE-HAND ULTRASOUND
Richard Prager, Robert Rohling, Andrew Gee and Laurence Berman
September 1997
3-D free-hand ultrasound is a new imaging technique which is rapidly finding clinical applications. A position sensing device is attached to a conventional ultrasound probe, so that as B-scans are acquired they can be labelled with their relative positions and orientations. This allows the B-scans to be inserted into a 3-D voxel array, which can then be visualised using any-plane slicing, volume rendering or surface rendering. A key requirement of all free-hand imaging systems is calibration: determining the position and orientation of the B-scan with respect to the position sensor. This is typically a lengthy and tedious process, which may need repeating every time a sensor is mounted on a probe. This paper describes a new calibration technique, which takes only a few minutes to perform and produces more accurate and repeatable results than all previously published alternatives.
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