Golay Coded Sequences in Synthetic Aperture Imaging Systems

Trots, Ihor; Tasinkevych, Yuriy; Nowicki, Andrzej; Lewandowski, Marcin

doi:10.2478/v10168-011-0061-5

Cited by 16 publications

(13 citation statements)

References 16 publications

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“…. To achieve high spatial resolution, we compound together all 128 images ˆi f as given in (10). In addition to the resolution improvements, we are interested in evaluating the dependency of the image quality given a different number of compounding images.…”

Section: B the Configuration Of The Receiving Arraymentioning

confidence: 99%

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High-Resolution Ultrasound Imaging Using Random Interference

Lee

2020

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Spatial resolution in conventional sonography is achieved through focusing and steering of an ultrasound beam. However, due to acoustic diffraction, the ability to focus an ultrasound beam is limited which leads to low spatial and contrast resolutions. We aim to propose a new method wherein the array elements are simultaneously excited with signals coded with random sequences, which yields an unfocused ultrasound wavefront of random interference. When such a wavefront propagates through the medium, its energy reflects back from the tissue, causing individual scatterers to have unique impulse responses. In such a case, we can reconstruct high-resolution ultrasound images using a priori measurements of spatial impulse responses and the l1 norm minimization algorithm. In a simulation study, we achieved a spatial resolution of 0.25 mm, which constitutes a four-fold improvement over conventional methods that use delay-and-sum beamforming. In the experimental study, we demonstrate the accuracy of the proposed interference-based method using a tissue-mimicking phantom with 0.1-mm-and 0.08mm-diameter nylon wires.

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Section: B the Configuration Of The Receiving Arraymentioning

confidence: 99%

“…Various filtering techniques have been developed to suppress speckle noise [8,9]. Coded excitation has been used to achieve extended imaging depth [10]. Other excitation sequences have also been investigated; for example, a delay-encoded transmission scheme was proposed in [11] to increase the signal-to-noise ratio (SNR).…”

Section: Introductionmentioning

confidence: 99%

High-Resolution Ultrasound Imaging Using Random Interference

Lee

2020

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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“…However, low-correlation properties do not work well in applications with superimposed signals having various levels of power; in these cases, the property is preferable [15], [17]. Various studies have examined ultrasonic synthetic-aperture focusing techniques for sequences with particular properties [1], [10], [15], [25], [33], [34], [53].…”

Section: Ultrasonic Imaging Using the Proposed Sequence Setmentioning

confidence: 99%

A Novel Class of Structured Zero-Correlation Zone Sequence Sets

Hayashi

Maeda

Pham

et al. 2018

IEICE Trans. Fundamentals

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Takafumi HAYASHI †a) , Senior Member, Takao MAEDA † †b) , Anh T. PHAM † †c) , and Shinya MATSUFUJI † † †d) , Members SUMMARY The present paper introduces a novel type of structured ternary sequences having a zero-correlation zone ( ) for both periodic and aperiodic correlation functions. The cross-correlation function and the side lobe of the auto-correlation function of the proposed sequence set are zero for phase shifts within the . The proposed sequence set can be generated from an arbitrary pair of an Hadamard matrix of order`h and a binary/ternary perfect sequence of length`p . The sequence set of order 0 is identical to the r-th row of the Hadamard matrix. For m 0, the sequence set of order (m + 1) is constructed from the sequence set of order m by sequence concatenation and interleaving. The sequence set has`p subsets of size 2`h . The periodic correlation function and the aperiodic correlation function of the proposed sequence set have a from (2 m+1 1) to 2 m+1 1. The periodic correlation function and the aperiodic correlation function of the sequences of the i-th subset and k-th subset have a from 2 m+2 (`h + 1)((j k) mod`p ) to 2 m+2 (`h + 1)(( j k) mod`p ). The proposed sequence is suitable for a heterogeneous wireless network, which is one of the candidates for the fifth-generation mobile networks.

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“…The conclusion is that regardless of the carrier signal and filtering, the CC/AC decreases with increasing duration. Using (6) and the FM signals used in the example, the theoretical upper limit of CC/AC can be calculated. This theoretical upper limit is also shown in Fig.…”

Section: A Design Of Mismatched Frequency-modulation Waveformsmentioning

confidence: 99%

“…On the other hand, synthetic aperture in addition to reducing the complexity and cost of the imaging system facilitates faster acquisition while making the best use of the steering capacity of the array [2]- [5]. The combination of these two methods is not a new idea [2], [6], [7], but the motivation is to benefit from the advantages of both. In this paper, we propose some novel methods that use CE more effectively to increase the SNR, depth penetration, and frame rate.…”

Section: Introductionmentioning

confidence: 99%

High-Frame-Rate Synthetic Aperture Ultrasound Imaging Using Mismatched Coded Excitation Waveform Engineering: A Feasibility Study

Lashkari

Zhang

Mandelis

2016

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Mismatched coded excitation (CE) can be employed to increase the frame rate of synthetic aperture ultrasound imaging. The high autocorrelation and low cross correlation (CC) of transmitted signals enables the identification and separation of signal sources at the receiver. Thus, the method provides B-mode imaging with simultaneous transmission from several elements and capability of spatial decoding of the transmitted signals, which makes the imaging process equivalent to consecutive transmissions. Each transmission generates its own image and the combination of all the images results in an image with a high lateral resolution. In this paper, we introduce two different methods for generating multiple mismatched CEs with an identical frequency bandwidth and code length. Therefore, the proposed families of mismatched CEs are able to generate similar resolutions and signal-to-noise ratios. The application of these methods is demonstrated experimentally. Furthermore, several techniques are suggested that can be used to reduce the CC between the mismatched codes.

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Golay Coded Sequences in Synthetic Aperture Imaging Systems

Cited by 16 publications

References 16 publications

High-Resolution Ultrasound Imaging Using Random Interference

High-Resolution Ultrasound Imaging Using Random Interference

A Novel Class of Structured Zero-Correlation Zone Sequence Sets

High-Frame-Rate Synthetic Aperture Ultrasound Imaging Using Mismatched Coded Excitation Waveform Engineering: A Feasibility Study

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