year 2, Issue 1 (Journal of Acoustical Engineering Society of Iran 2014)
مجله انجمن علوم صوتی ایران (مهندسی صوتیات سابق) 2014, 2(1): 24-31 |
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Mohades Deilami A, Mohammadzadeh Asl B. Reduction of computational complexity of minimum variance beamforming in beam-space . مجله انجمن علوم صوتی ایران (مهندسی صوتیات سابق) 2014; 2 (1) :24-31
URL: http://joasi.ir/article-1-45-en.html
URL: http://joasi.ir/article-1-45-en.html
Abstract: (8295 Views)
Common medical ultrasound beamformers such as Delay and Sum can be interpreted as element-space methods. In element-space, the received data would be added after applying delays and appropriate weights. The main idea in beam-space beamforming is to use orthogonal beams steered in different directions instead of using spatial statistics of elements in array to distinguish between desired signal and interferences. This means a map from element-space to beam-space. The amount of computation would be reduced because of less signal dimensions, but extra computation is needed to make the map from element-space to beam-space. This additional calculation can be reduced by using FFT.
In this paper, minimum variance beamformer is implemented in beam-space instead of element-space to reduce computational complexity. Results show that minimum variance in beam-space can achieve similar resolution and can decrease side lobes as element-space.
Type of Study: Research |
Subject:
Hydroacoustics
Received: 2014/04/19 | Accepted: 2014/09/12 | Published: 2014/09/22
Received: 2014/04/19 | Accepted: 2014/09/12 | Published: 2014/09/22
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