A desktop magnetic resonance imaging system

Wright, Steven M.; Brown, David G.; Porter, Jay; Spence, David C.; Esparza, Emilio; Cole, David C.; Huson, F. R.

doi:10.1007/bf02678594

Cited by 27 publications

(10 citation statements)

References 14 publications

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“…The stray fields were minimized, and the housing was used as a solid mounting suspension (e.g., similar to an iron yoke of a c-shaped permanent magnet [14]). In addition, external interference signals were effectively shielded.…”

Section: Methodsmentioning

confidence: 99%

Design of a mobile, homogeneous, and efficient electromagnet with a large field of view for neonatal low-field MRI

Lother

Neuberger

Jakob

et al. 2016

Magn Reson Mater Phy

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Objective In this work, a prototype of an effective electromagnet with a field-of-view (FoV) of 140 mm for neonatal head imaging is presented. The efficient implementation succeeded by exploiting the use of steel plates as a housing system. We achieved a compromise between large sample volumes, high homogeneity, high B0 field, low power consumption, light weight, simple fabrication, and conserved mobility without the necessity of a dedicated water cooling system. Materials and methods The entire magnetic resonance imaging (MRI) system (electromagnet, gradient system, transmit/receive coil, control system) is introduced and its unique features discussed. Furthermore, simulations using a numerical optimization algorithm for magnet and gradient system are presented. Results Functionality and quality of this low-field scanner operating at 23 mT (generated with 500 W) is illustrated using spin-echo imaging (in-plane resolution 1.6 mm × 1.6 mm, slice thickness 5 mm, and signal-to-noise ratio (SNR) of 23 with a acquisition time of 29 min). B0 field-mapping measurements are presented to characterize the homogeneity of the magnet, and the B0 field limitations of 80 mT of the system are fully discussed. Conclusion The cryogen-free system presented here demonstrates that this electromagnet with a ferromagnetic housing can be optimized for MRI with an enhanced and homogeneous magnetic field. It offers an alternative to pre-polarized MRI designs in both readout field strength and power use. There are multiple indications for the clinical medical application of such low-field devices.

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Section: Methodsmentioning

confidence: 99%

Design of a mobile, homogeneous, and efficient electromagnet with a large field of view for neonatal low-field MRI

Lother

Neuberger

Jakob

et al. 2016

Magn Reson Mater Phy

View full text Add to dashboard Cite

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“…The upper limit of operation was 12.5 MHz, based on the upper limit of the ADC card. In 2002, LabVIEW control was reported for a low‐field MRI at 8.9 MHz (210 mT) . In this case, NI cards in the stand alone PC and LabVIEW were used to control separate external frequency synthesizing and pulse shaping units.…”

Section: Discussionmentioning

confidence: 99%

“…Of the previous low‐field spectrometers, which have been programmed with LabVIEW, only attempted to describe the code on a case by case basis, and even then used simplified VI diagrams, which left some ambiguity. While we did emulate the data processing from, other programming requirements were different because of the changes in the hardware we used, and removal of TTL control.…”

Section: Instrument Designmentioning

confidence: 99%

Characterization of a PXIe based low‐field digital NMR spectrometer

Biller

Stupic

Kos

et al. 2017

Concepts Magn Reson

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A low‐field nuclear magnetic resonance (NMR) instrument is an important tool for investigating a wide variety of samples under different conditions. In this paper, we describe a system constructed primarily with commercially available hardware and control software, capable of single‐pulse NMR experiments. Details of the construction of the main B0 magnet are also included. The operating frequency for demonstration is 460 kHz (10 mT), however, the range of the hardware spans 700 Hz (16 μT) to 25 MHz (0.6 T). Tip angle optimizations are used to find the most narrow usable pulse width for this configuration, and the T1 of water is measured by single‐pulse‐saturation‐recovery (SPSR) to demonstrate the potential for this system as a relaxometer. Discussions of resonator construction and efficiency, power requirements and programming strategies that would increase the utility of this system are also included. Construction of any low‐field NMR system will depend on experimental interests, budget and engineering resources. A survey of other low‐field NMR systems from the literature is included to aid the novice or experienced magnetic resonance scientist in consideration of how a low‐field spectrometer could be constructed and used in the lab.

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“…Commercial MRI instruments are generally associated with a high cost and technological opaqueness. Over the past few decades, researchers have worked to counteract these problems by developing affordable, home‐built MRI systems or their major components, along with detailed technical information that is open to the public .…”

Section: Introductionmentioning

confidence: 99%

“…As one of the most critical elements of an MRI system, the MR console is a versatile platform for running pulse sequences, driving radio frequency (RF) and gradient coils, and acquiring signals to create images. The current literature features several articles on homemade console designs, many of which have utilized one of the following three strategies: a) a classical strategy that uses a centralized architecture, where the console is tightly coupled to a personal computer (PC) . This approach features a central data bus and standard PC‐based boards, such as peripheral component interconnect (PCI) cards or laboratory virtual instrumentation engineering workbench (LabVIEW; Austin, TX) modules, which facilitate interprocess communication and system control, although the approach is limited by the lack of scalability; b) a modern strategy that uses a decentralized architecture, where the console is self‐contained hardware that only loosely interacts with a PC, thus facilitating the scale‐up of multiple channels ; and c) a modularized design concept in which the major console components operate as autonomous devices under the control of parallel sequencers, allowing for time‐critical events to be accurately coordinated and simultaneously implemented.…”

Section: Introductionmentioning

confidence: 99%