Experimental 3-D Ultrasound Imaging with 2-D Sparse Arrays using Focused and Diverging Waves

• Published in: Scientific reports 2018-06, Vol.8 (1), p.9108-12, Article 9108
• Main Authors: Roux, Emmanuel, Varray, François, Petrusca, Lorena, Cachard, Christian, Tortoli, Piero, Liebgott, Hervé
• Format: Article
• Language: English
• Subjects: 639/166/987; 639/766/25/3927; Acoustics; Bioengineering; Engineering Sciences; Humanities and Social Sciences; Imaging; Life Sciences; multidisciplinary; Science; Science (multidisciplinary); Ultrasonic imaging; Ultrasound
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-018-27490-2

Three dimensional ultrasound (3-D US) imaging methods based on 2-D array probes are increasingly investigated. However, the experimental test of new 3-D US approaches is contrasted by the need of controlling very large numbers of probe elements. Although this problem may be overcome by the use of 2-D sparse arrays, just a few experimental results have so far corroborated the validity of this approach. In this paper, we experimentally compare the performance of a fully wired 1024-element (32 × 32) array, assumed as reference, to that of a 256-element random and of an “optimized” 2-D sparse array, in both focused and compounded diverging wave (DW) transmission modes. The experimental results in 3-D focused mode show that the resolution and contrast produced by the optimized sparse array are close to those of the full array while using 25% of elements. Furthermore, the experimental results in 3-D DW mode and 3-D focused mode are also compared for the first time and they show that both the contrast and the resolution performance are higher when using the 3-D DW at volume rates up to 90/second which represent a 36x speed up factor compared to the focused mode.