Abstract
A prototype needle hydrophone array for acoustic feedback during phased-array hyperthermia treatments was presented last year at this Symposium. In this paper, we present a new algorithm for adaptive dynamic focusing of phased-array applicators in the presence of inhomogeneities. This algorithm uses measurements from a limited number of acoustic sensors such as those on the needle hydrophone array. The algorithm is based on a Taylor series expansion of the (measured) propagation operator from the array elements, in the vicinity of the implanted acoustic sensors. We show that the new algorithm does not require prior knowledge of the applicator geometry and that all parameters for correction terms can be measured directly at the sensor location. Experimental results of dynamic focusing based on the new algorithm are presented using a 1D cylindrical section phased-array prototype.
| Original language | English (US) |
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| Title of host publication | Proceedings of the IEEE Ultrasonics Symposium |
| Publisher | Publ by IEEE |
| Pages | 1221-1224 |
| Number of pages | 4 |
| Volume | 2 |
| ISBN (Print) | 0780312783 |
| State | Published - Dec 1 1993 |
| Event | Proceedings of the IEEE 1993 Ultrasonics Symposium - Baltimore, MD, USA Duration: Oct 31 1993 → Nov 3 1993 |
Other
| Other | Proceedings of the IEEE 1993 Ultrasonics Symposium |
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| City | Baltimore, MD, USA |
| Period | 10/31/93 → 11/3/93 |