Sparse 2-D arrays for 3-D phased array imaging - design methods

Austeng, Andreas; Holm, Sverre

doi:10.1109/tuffc.2002.1026019

Cited by 200 publications

(112 citation statements)

References 27 publications

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“…ISLR is the measure of the ratio of sum of side lobe and sum of main lobe. In addition, the maximum value of the size lobe (side lobe peak) and the total energy of the side lobe (side lobe sum) are use as the evaluation indicators [6]. In the evaluation of the side lobes of the sparse array, the area of the side lobes is based on that of the dense array, which is presented in The image quality of three arrays are presented in Table 3.…”

Section: Simulation Resultsmentioning

confidence: 99%

2D Sparse Array Transducer Optimization for 3D Ultrasound Imaging

Choi¹,

Park²

2014

Journal of the Korean Society for Nondestructive Testing

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A 3D ultrasound image is desired in many medical examinations. However, the implementation of a 2D array, which is needed for a 3D image, is challenging with respect to fabrication, interconnection and cabling. A 2D sparse array, which needs fewer elements than a dense array, is a realistic way to achieve 3D images. Because the number of ways the elements can be placed in an array is extremely large, a method for optimizing the array configuration is needed. Previous research placed the target point far from the transducer array, making it impossible to optimize the array in the operating range. In our study, we focused on optimizing a 2D sparse array transducer for 3D imaging by using a simulated annealing method. We compared the far-field optimization method with the near-field optimization method by analyzing a point-spread function (PSF). The resolution of the optimized sparse array is comparable to that of the dense array.

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Section: Simulation Resultsmentioning

confidence: 99%

2D Sparse Array Transducer Optimization for 3D Ultrasound Imaging

Choi¹,

Park²

2014

Journal of the Korean Society for Nondestructive Testing

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“…Note that all the existing methods for designing an active array using the concept of effective aperture [2], [3], [16], [17] tried to either avoid the grating lobes by eliminating the periodicity of the sparse arrays or attenuate the grating lobes by introducing nulls in the effective aperture functions. Using the FRM technique, it will be shown next that instead of suppressing all the grating lobes completely, some of them can be integrated in mainlobe synthesis by exploiting the complementary property of {h a (n)} and {h c (n)} and by properly designing the masking filters.…”

Section: Active Array Beamforming Using the Frm Techniquementioning

confidence: 99%

On the Applications of the Frequency-Response Masking Technique in Array Beamforming

Liu

Lin

2006

Circuits Syst Signal Process

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Abstract. The frequency-response masking (FRM) technique is well known to be very efficient in the implementation of finite impulse response (FIR) filters with sharp transition bands. As sensor array beamforming is closely related to FIR filtering, the feasibility of the applications of the FRM technique in array beamforming is investigated in detail in this paper. On one hand, it is shown that there is a limitation in applying the FRM technique in passive array beamforming. On the other hand, for active array beamforming, a novel combination of the concept of effective aperture and the FRM technique does lead to the synthesis of desirable beamformers. These beamformers have effective beampatterns with sharp transition bands and low sidelobes, and can be implemented with fewer sensors than other design techniques.

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“…However, the main technical challenge faced by the volumetric imaging is that an ultrasound system needs thousands of the channels to operate a large number of elements in a 2-D array. To overcome the channel limitation in utilizing the 2-D arrays, various approaches were proposed such as the microbeamformer, the reconfigurable array, and the sparse array [5][6][7][8][9][10]. A sparse array has been suggested by picking array elements in a random or regular manner to minimize the number of required channels [7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…To overcome the channel limitation in utilizing the 2-D arrays, various approaches were proposed such as the microbeamformer, the reconfigurable array, and the sparse array [5][6][7][8][9][10]. A sparse array has been suggested by picking array elements in a random or regular manner to minimize the number of required channels [7][8][9][10][11]. Once the sparse array set is fixed, the elements in a 2-D array can be directly controlled by an ultrasound system, which can avoid the complicated hardware designs.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis on Cross-Shaped Array with Dynamic Transmit Focusing for Enhanced Volumetric Ultrasound Imaging

Park

Kang

2016

Applied Sciences

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Volumetric ultrasound imaging has been primarily used as a clinical tool to diagnose cardiac dysfunction. However, the modality still suffers from system complexity due to a large number of receive channels for volumetric reconstruction. The aim of the study was to numerically assess a cross-shaped sparse array with a dynamic transmit focusing method to reduce the system complexity and to compensate for the image quality of unfocused volumetric imaging. Analytical simulations with two-way point spread functions demonstrated that the cross-shaped sparse array entailed up to an 84% increase in side-lobes (up to 32 dB), thus leading to significant degradation of the point spread function in the diagonal plane. A dynamic transmit focusing method was able to vividly overcome the image degradation by transmitting more beams with tilting angles. This also yielded a comparable image sensitivity (65 dB) to that of the full array when 31 × 31 tilted waves were used. The proposed cross-shaped sparse array with the dynamic transit focusing method can be used to enhance the frame rate as well as the image quality for unfocused ultrasound imaging.

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Sparse 2-D arrays for 3-D phased array imaging - design methods

Cited by 200 publications

References 27 publications

2D Sparse Array Transducer Optimization for 3D Ultrasound Imaging

2D Sparse Array Transducer Optimization for 3D Ultrasound Imaging

On the Applications of the Frequency-Response Masking Technique in Array Beamforming

Numerical Analysis on Cross-Shaped Array with Dynamic Transmit Focusing for Enhanced Volumetric Ultrasound Imaging

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