Abstract
The recently introduced plane-wave compounding method based on multiple plane-wave excitation has enabled several new applications due to its high frame rate (>1000 Hz). In this paper, a new efficient transmit delay calculation method in plane-wave compound imaging for a curved array transducer is presented. In the proposed method, the transmit delay is only calculated for a steering angle of 0° and is shifted along the element of the transducer to obtain other transmit delays for different steering angles. To evaluate the performance of the proposed method, the computational complexity was measured for various transmission conditions. For the number of elements and plane-wave excitations of 128 and 65, respectively, the number of operations was substantially decreased in the proposed method compared with the conventional method (256 vs. 8320). The benefits of the proposed method were demonstrated with phantom and in vivo experiments, where coherent plane-wave compounding with 65 excitations provided larger CR and CNR values compared to nine excitations (−22.5 dB and 2.7 vs. −11.3 dB and 1.9, respectively). These results indicate the proposed method can effectively reduce the computational complexity for plane-wave compound imaging in curved array transducers.
Highlights
In conventional medical ultrasound imaging, numerous focused ultrasound beams are utilized to scan a region of interest (ROI) [1]
The total number is (N + 2 ∙ k ) in the proposed method while the number is (Nele × NPW ) in the conventional method, where NPW is the number of transmit plane-waves total number is (N × N ) in the conventional method, where NPW is the number of transmit with different steering angles, and km is related to θPW and dθ as follows: plane-waves with different steering angles, and k is related to θ and dθ as follows: θ θ= k ∙=dθk·dθ
An efficient transmit delay calculation method based on the reuse of time delay
Summary
In conventional medical ultrasound imaging, numerous focused ultrasound beams are utilized to scan a region of interest (ROI) [1]. Delays of the plane beams and reconstruct the images in curved array imaging These increments in as the number of transmissions per frame increases, more computations are required to terms of computational complexity can be considered a challenge for real-time imaging. By changing the position and size of the ROI map along the axial and must be adjusted to provide uniform image quality and field of view [9] These transmit delays can be lateral directions, the transmit delays corresponding to the number of plane-wave transmissions and pre-calculated and stored in the look-up table (LUT). Since the number of transmission cases the degree of steering angles must be adjusted to provide uniform image quality and field of view varies depending on the target application, it is advantageous to recalculate the transmit delays in [9] These transmit delays can be pre-calculated and stored in the look-up table (LUT).
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