A LabVIEW-based operating system for parallel transmit systems

Moody, Katherine Lynn; Hollingsworth, Neal A.; Nielsen, Jon‐Fredrik; Noll, Douglas C.; Wright, Steven M.; McDougall, Mary P.

doi:10.1109/isbi.2011.5872519

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…A single hard pulse played out from the scanner is divided eight ways and then modulated by an in-house built vector modulator [29]. The control system employs a PXI-7853R FPGA-based board with programs written in LabVIEW (National Instruments, Austin, TX) to drive the hardware and provide the baseband in-phase and quadrature signals to the vector modulator from the user-defined amplitude and phase information of each RF pulse [30]. The modulated waveforms pass through a first gain stage prior to the ultra-low output impedance amplifiers.…”

Section: Methodsmentioning

confidence: 99%

An eight-channel T/R head coil for parallel transmit MRI at 3T using ultra-low output impedance amplifiers

Moody¹,

Hollingsworth²,

Zhao³

et al. 2014

Journal of Magnetic Resonance

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Parallel transmit is an emerging technology to address the technical challenges associated with MR imaging at high field strengths. When developing arrays for parallel transmit systems, one of the primary factors to be considered is the mechanism to manage coupling and create independently operating channels. Recent work has demonstrated the use of amplifiers to provide some or all of the channel-to-channel isolation, reducing the need for on-coil decoupling networks in a manner analogous to the use of isolation preamplifiers with receive coils. This paper discusses an eight-channel transmit/receive head array for use with an ultra-low output impedance (ULOI) parallel transmit system. The ULOI amplifiers eliminated the need for a complex lumped element network to decouple the eight rung array. The design and construction details of the array are discussed in addition to the measurement considerations required for appropriately characterizing an array when using ULOI amplifiers. B1 maps and coupling matrices are used to verify the performance of the system.

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Section: Methodsmentioning

confidence: 99%

An eight-channel T/R head coil for parallel transmit MRI at 3T using ultra-low output impedance amplifiers

Moody¹,

Hollingsworth²,

Zhao³

et al. 2014

Journal of Magnetic Resonance

Self Cite

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show abstract

“…A control system written in LabVIEW (National Instruments, Austin, TX) drives the hardware and provides the baseband in-phase and quadrature signals to the vector modulator [9]. The modulated waveforms pass through a first gain stage prior to the ultra-low output impedance amplifiers [10].…”

Section: Parallel Transmit System Overviewmentioning

confidence: 99%

Eight-channel transmit/receive head array for use with ultra-low output impedance amplifiers

Moody

Hollingsworth

Nielsen

et al. 2013

2013 IEEE 10th International Symposium on Biomedical Imaging

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Parallel transmit technology for magnetic resonance imaging can mitigate the challenges with the transmit field (B 1 ) inhomogeneity and capture the increased signal-to-noise ratio benefit at high field strengths. Most of the available parallel transmit systems use conventional amplifier architectures with array coils that employ complex decoupling methods to isolate the individual elements. Current sources and ultra-low output impedance amplifiers offer the advantage of providing some additional decoupling to the array elements, allowing more flexibility in the array design. We present our work designing and building an eight-channel transmit/receive head array to work with ultralow output impedance amplifiers on a 3 Tesla GE clinical scanner.

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Mobile Robot Capable of Crossing Floors for Library Management

Han

Chen

et al. 2019

2019 IEEE International Conference on Mechatronics and Automation (ICMA)

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A LabVIEW-based operating system for parallel transmit systems

Cited by 3 publications

References 5 publications

An eight-channel T/R head coil for parallel transmit MRI at 3T using ultra-low output impedance amplifiers

An eight-channel T/R head coil for parallel transmit MRI at 3T using ultra-low output impedance amplifiers

Eight-channel transmit/receive head array for use with ultra-low output impedance amplifiers

Mobile Robot Capable of Crossing Floors for Library Management

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