Ultrasonic Phased Array Sparse-TFM Imaging Based on Sparse Array Optimization and New Edge-Directed Interpolation

The ultrasonic phased array total focusing method (TFM) has the advantages of full-range dynamic focusing and high imaging resolution, but the problem of long imaging time limits its practically industrial applications. To reduce the imaging calculation demand of TFM, the locations of active array e...

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Bibliographic Details
Published in:Sensors (Basel, Switzerland) Vol. 18; no. 6; p. 1830
Main Authors: Hu, Hongwei, Du, Jian, Ye, Chengbao, Li, Xiongbing
Format: Journal Article
Language:English
Published: Switzerland MDPI AG 05.06.2018
MDPI
Subjects:
Composite materials
Efficiency
Field programmable gate arrays
Genetic algorithms
new edge-directed interpolation
Optimization algorithms
Sensors
sparse array optimization
sparse-TFM imaging
ultrasonic phased array
sparse array optimization
new edge-directed interpolation
ultrasonic phased array
sparse-TFM imaging
ISSN:1424-8220, 1424-8220
Online Access:Get full text
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Summary:The ultrasonic phased array total focusing method (TFM) has the advantages of full-range dynamic focusing and high imaging resolution, but the problem of long imaging time limits its practically industrial applications. To reduce the imaging calculation demand of TFM, the locations of active array elements in the sparse array are optimized by combining almost different sets with the genetic algorithm (ADSGA), and corrected based on the consistency of the effective aperture with the equivalent point diffusion function. At the same time, to further increase the imaging efficiency, a sparse-TFM image with lower resolution is obtained by reducing the number of focus points and then interpolated by the new edge-directed interpolation algorithm (NEDI) to obtain a high quality sparse-TFM image. Compared with TFM, the experimental results show that the quantitative accuracy of the proposed method is only decreased by 1.09% when the number of sparse transmitting elements reaches 8 for a 32-element transducer, and the imaging speed is improved by about 16 times with the same final pixel resolution.
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ISSN:1424-8220
1424-8220
DOI:10.3390/s18061830