A digital receiver with fast frequency- and gain-switching capabilities for MRI systems

Ning, Ruipeng; Yidong, Dai; Yang, Guang; Li, Gengying

doi:10.1007/s10334-009-0182-2

Cited by 9 publications

(2 citation statements)

References 15 publications

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“…The Direct Digital RF receiver technology digitizes the MR signal at the patient, and the fiber-optic connection from the coil to the image reconstructor enables lossless broadband data transmission. Previous reports suggested that this technique improved the dynamic range of the RF receiver and resulted in an improved signal-to-noise ratio (SNR) (Ruipeng et al 2009 ). Dual-source radiofrequency transmission with patient-adaptive local radiofrequency shimming enables uniform RF shimming for cardiac MRI (Mueller et al 2012 ).…”

Section: Introductionmentioning

confidence: 99%

Single-breath-hold whole-heart coronary MRA in healthy volunteers at 3.0-T MRI

Iyama¹,

Nakaura²,

Kidoh

et al. 2014

SpringerPlus

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BackgroundThe purpose of this study was to investigate the feasibility of single-breath-hold whole-heart MRA with a 3-T system. Ten healthy male volunteers underwent single-breath-hold whole-heart coronary MRA at 3 T. We assessed acquisition time, scores of image quality of coronary artery (RCA: proximal, middle and distal, LAD: main, proximal, middle and distal, LCX: proximal and distal) and the visualized vessel length of RCA, LAD and LCX.FindingsMean acquisition time was 37.7 ± 5.2 sec. Coronary branch was successfully depicted in 67/80 branches (84%) in the 10 healthy volunteers with diagnostic image quality. And, the average visible RCA, LAD and LCX vessel length were 83.4 ± 22 mm and 59.6 ± 24 mm.Conclusions3-T MRI with single-breath-hold 3D whole-heart coronary MRA can yield adequate image quality. Further study is needed to evaluate the clinical benefit of this technique.

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Section: Introductionmentioning

confidence: 99%

Single-breath-hold whole-heart coronary MRA in healthy volunteers at 3.0-T MRI

Iyama¹,

Nakaura²,

Kidoh

et al. 2014

SpringerPlus

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“…[9][10][11][12][13][14][15][16][17][18][19] However, most of these focus on either the transmitter 11,16 or the receiver 9,14,15,19 only. Other spectrometers can only be used in ultra-low magnetic fields, 13 or rely on external mixers for down-converting the signals to lower intermediate frequencies.…”

Section: Introductionmentioning

confidence: 99%

A firmware-defined digital direct-sampling NMR spectrometer for condensed matter physics

Pikulski

Shiroka

Ott

et al. 2014

Review of Scientific Instruments

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We report on the design and implementation of a new digital, broad-band nuclear magnetic resonance (NMR) spectrometer suitable for probing condensed matter. The spectrometer uses direct sampling in both transmission and reception. It relies on a single, commercially-available signal processing device with a user-accessible field-programmable gate array (FPGA). Its functions are defined exclusively by the FPGA firmware and the application software. Besides allowing for fast replication, flexibility, and extensibility, our software-based solution preserves the option to reuse the components for other projects. The device operates up to 400 MHz without, and up to 800 MHz with undersampling, respectively. Digital down-conversion with ±10 MHz passband is provided on the receiver side. The system supports high repetition rates and has virtually no intrinsic dead time. We describe briefly how the spectrometer integrates into the experimental setup and present test data which demonstrates that its performance is competitive with that of conventional designs.

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