Papers Published

1. Dahl, Jeremy J. and Guenther, Drake and Trahey, Gregg E., Performance evaluation of combined spatial compounding/adaptive imaging: Simulation, phantom and clinical trials, Proceedings of the IEEE Ultrasonics Symposium, vol. 2 (2003), pp. 1532 - 1536 .
   (last updated on 2007/04/13)

   Abstract:
   Spatial compounding reduces speckle and increases image contrast by incoherently averaging images acquired at different viewing angles. Adaptive imaging improves contrast and resolution by compensating for tissue induced phase errors. Aberrator strength and spatial frequency content markedly impact the desirable operating characteristics and performance of these methods for improving image quality. We present simulation, phantom and clinical experiments of spatial compounding, adaptive imaging, and a combination of these two methods in contrast and resolution tasks. With aberrations at high strength and low spatial frequency content, spatial compounding can yield significant (20-50%) improvements in contrast-to-noise ratio (CNR). For all aberration strengths and spatial frequencies, adaptive imaging yields superior improvement to spatial compounding in restoring lateral spatial frequencies of the image. Concurrent use of both imaging techniques yields the best results in CNR and resolution.

   Keywords:
   Medical imaging;Speckle;Aberrations;Signal to noise ratio;Contrast media;Transducers;Image quality;Error analysis;Transfer functions;Computer simulation;