Abstract for hsu_tr579

Cambridge University Engineering Department Technical Report CUED/F-INFENG/TR 579

COMPARISON OF FREEHAND 3D ULTRASOUND CALIBRATION TECHNIQUES USING A STYLUS

Po-Wei Hsu, Graham M. Treece, Richard W. Prager, Neil E. Houghton and Andrew H. Gee

June 2007

In a freehand 3D ultrasound system, a probe calibration is required to find the rigid body transformation from the corner of the B-scan to the electrical centre of the position sensor. The most intuitive way to perform such a calibration is by locating fiducial points in the scan plane directly with a stylus. The main problem of using this approach is the difficulty in aligning the tip of the stylus with the scan plane. The thick beam width makes the tip of the stylus visible in the B-scan even if the tip is not exactly in the elevational centre of the scan plane. In this paper, we present two novel phantoms that simplify the alignment process for more accurate probe calibration. We also compare our calibration techniques with a range of styli and show that our phantom outperforms other approaches in both accuracy and simplicity.


(ftp:) hsu_tr579.pdf (http:) hsu_tr579.pdf

If you have difficulty viewing files that end '.gz', which are gzip compressed, then you may be able to find tools to uncompress them at the gzip web site.

If you have difficulty viewing files that are in PostScript, (ending '.ps' or '.ps.gz'), then you may be able to find tools to view them at the gsview web site.

We have attempted to provide automatically generated PDF copies of documents for which only PostScript versions have previously been available. These are clearly marked in the database - due to the nature of the automatic conversion process, they are likely to be badly aliased when viewed at default resolution on screen by acroread.