Using Large Arrays for SNR Improvement on Receiver Limited MRI Systems

Spence, D.K.; Wright, Steven M.; Ji, Junliang

doi:10.1109/iembs.2005.1615412

Cited by 3 publications

(4 citation statements)

References 10 publications

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“…The proposed method is particularly useful to improve imaging performance for MR imaging where MRI scanner has a limited receive channel number. In addition, this study also suggests that for a MR system with N receiver channels, it is advantageous and beneficial to utilize a receiver coil array with more than N elements to gain SNR and parallel imaging performance [34], [49].…”

Section: Discussionmentioning

confidence: 99%

“…In order to use a large or massive array on a receiver limited system to achieve optimized SNR, appropriate signal combination can be done by using specific hardware before the signal reaching the receiver. Correlated method [34] was developed by Spence et al to demonstrate the feasibility. Mode matrix [35] and eigencoil array [36] concepts proposed by Reykowski et al and King et al, respectively, might be another means of using hardware to reduce the number of receivers required and maintain the optimized SNR.…”

Section: Introductionmentioning

confidence: 99%

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Multi-Reception Strategy with Improved SNR for Multichannel MR Imaging

Wang

et al. 2012

PLoS ONE

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A multi-reception strategy with extended GRAPPA is proposed in this work to improve MR imaging performance at ultra-high field MR systems with limited receiver channels. In this method, coil elements are separated to two or more groups under appropriate grouping criteria. Those groups are enabled in sequence for imaging first, and then parallel acquisition is performed to compensate for the redundant scan time caused by the multiple receptions. To efficiently reconstruct the data acquired from elements of each group, a specific extended GRAPPA was developed. This approach was evaluated by using a 16-element head array on a 7 Tesla whole-body MRI scanner with 8 receive channels. The in-vivo experiments demonstrate that with the same scan time, the 16-element array with twice receptions and acceleration rate of 2 can achieve significant SNR gain in the periphery area of the brain and keep nearly the same SNR in the center area over an eight-element array, which indicates the proposed multi-reception strategy and extended GRAPPA are feasible to improve image quality for MRI systems with limited receive channels. This study also suggests that it is advantageous for a MR system with N receiver channels to utilize a coil array with more than N elements if an appropriate acquisition strategy is applied.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Multi-Reception Strategy with Improved SNR for Multichannel MR Imaging

Wang

et al. 2012

PLoS ONE

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“…Note that the effects of clock jitter from (7) are included in and , and therefore, the digital-to-analog converter/ADC in the diagram are ideal. For brevity, (11) is rewritten as (12) where and . This is an overdetermined system, and the least square (LS) estimation 3 [35], [36] of is given by (13) where…”

Section: B Analytical Derivation Of the Symbol-detection Snrmentioning

confidence: 99%

“…requirements need to be received and detected by the wireless receiver. Also, as the number of radio-frequency (RF) channels in magnetic-resonance-imaging systems massively increases to achieve very fast scan times, the bandwidth and information rate quickly reach several gigahertz [9]- [12]. Demanding wireless transmission and reception speeds impose severe challenges for the analog baseband multichannel circuits needed in these applications [57]- [63].…”

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confidence: 99%

Clock-Jitter-Tolerant Wideband Receivers: An Optimized Multichannel Filter-Bank Approach

Hoyos

Pentakota

Ghany

et al. 2011

IEEE Trans. Circuits Syst. I

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Clock jitter is one of the most fundamental obstacles in realizing future generations of wideband receivers. Stringent jitter specifications in the sampling clocks of high-performance single-channel and multichannel time-interleaved analog-to-digital converters severely limit the evolution of baseband receivers. This paper presents an analytical framework for the design of clock-jitter-tolerant low-order multichannel filter-bank receivers, with techniques to dramatically lower the sampling-clock-jitter specifications. Although it is well understood that high-order frequency-channelized receivers provide higher tolerance to sampling jitter, this paper shows that low-order bandwidth-optimized multichannel receivers can achieve similar sampling-jitter tolerance. Additionally, this paper presents design tradeoffs and specifications of an example multichannel receiver that can process a 5-GHz baseband signal with 40 dB of signal-to-noise-ratio using sampling clocks that can tolerate up to 5 ps rms clock jitter. In comparison, existing architectures based on time-interleaving require 0 5 ps rms clock jitter for the given specifications. This extreme jitter tolerance allows for relaxed design of clocking systems, which averts a major roadblock in future wideband-communication-receiver development and provides the potential to enable several high-data-rate communication applications. Index Terms-Baseband receivers, channel bank filters, jitter. I. INTRODUCTION I MAGINE the potential offered if electronic devices, such as computers, cell phones, digital cameras, MP3 players, flat panels, and external hard disks wirelessly connect to each other at speeds similar to the processing capabilities of modern computers. Although it is clear that advances in the semiconductor industry provide some of the tools for these ideas to become reality [millimeter-wave radio (mmWR) [1], [2], software-defined radio [3], [4], cognitive radio (CR) [5], [6], [54] and multistandard radio [4], [7]], there remain challenging issues that prevent wireless multichannel systems from coming to fruition. For instance, in applications such as power-spectral-density estimation for CRs [6], [8] and future mmWR standards, several gigahertz of bandwidth with high dynamic-range Manuscript

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Towards a Standard Mixed-Signal Parallel Processing Architecture for Miniature and Microrobotics

Sadler

Hoyos

2014

J. RES. NATL. INST. STAN.

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The conventional analog-to-digital conversion (ADC) and digital signal processing (DSP) architecture has led to major advances in miniature and micro-systems technology over the past several decades. The outlook for these systems is significantly enhanced by advances in sensing, signal processing, communications and control, and the combination of these technologies enables autonomous robotics on the miniature to micro scales. In this article we look at trends in the combination of analog and digital (mixed-signal) processing, and consider a generalized sampling architecture. Employing a parallel analog basis expansion of the input signal, this scalable approach is adaptable and reconfigurable, and is suitable for a large variety of current and future applications in networking, perception, cognition, and control.

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Using Large Arrays for SNR Improvement on Receiver Limited MRI Systems

Cited by 3 publications

References 10 publications

Multi-Reception Strategy with Improved SNR for Multichannel MR Imaging

Multi-Reception Strategy with Improved SNR for Multichannel MR Imaging

Clock-Jitter-Tolerant Wideband Receivers: An Optimized Multichannel Filter-Bank Approach

Towards a Standard Mixed-Signal Parallel Processing Architecture for Miniature and Microrobotics

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