数字多波束逐点聚焦延时参数的压缩算法

The compression algorithm for focusing delay data in digital multi-beam forming

针对数字多波束合成技术在超声成像领域应用中存在逐点聚焦延时参数的存储容量过大的问题,提出了一种四波束逐点聚焦延时参数的压缩存储与实时生成算法。首先将四波束的聚焦延时问题转换成单波束的聚焦延时问题,然后对转换后的单波束聚焦延时数据进行量化、压缩和存储。在聚焦时,将压缩存储的延时参数进行解压,实时生成四波束所需的延时参数。以8通道128阵元的平阵探头为例,对该算法进行了相关的数学推导和证明,并对其性能进行了分析讨论,验证了该算法的优越性。

Digital multi-beam forming has been widely used in ultrasound imaging system. It can effectively improve frame rate and image resolution. However, the mass of focusing delay data makes it impractical to directly implement dynamic focusing. A compression algorithm for four-beam focusing delay data is proposed to effectively reduce the storage of focusing delay data. Firstly, the calculation of four-beam focusing delay data is simplified to that of single-beam focusing delay data, which are then quantified, compressed and stored. When in dynamic receive focusing process, focusing delay data can be generated by decompressing the stored data for each channel. Take 8-channel 128-element linear array of transducers as an example, the design procedures and related mathematical derivation are described in detail and performance of the algorithm is discussed to verify the algorithm＇s superiority.