A desktop imaging system for teaching MR engineering

Wright, Steven M.; McDougall, Mary P.; Bosshard, John C.

doi:10.1109/iembs.2010.5627156

Cited by 4 publications

(4 citation statements)

References 1 publication

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“…Based on this split design, the desktop MRI test sample tubes were used as a shell for the 18 mm-diameter phantom. Because of the structure of the magnet and coil (probe) in the compact MRI system (Wang et al 2008), the imaging region was a small area with a high homogeneous magnetic field (Wright et al 2010). The insert sections were fixed to the bottom of the tubes, so that they could be positioned in the centre of the imaging bore (figure 2(b)).…”

Section: Phantommentioning

confidence: 99%

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Testing the quality of images for permanent magnet desktop MRI systems using specially designed phantoms

Qiu¹,

Wang²,

Jiao³

et al. 2013

Phys. Med. Biol.

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Our aim was to measure the performance of desktop magnetic resonance imaging (MRI) systems using specially designed phantoms, by testing imaging parameters and analysing the imaging quality. We designed multifunction phantoms with diameters of 18 and 60 mm for desktop MRI scanners in accordance with the American Association of Physicists in Medicine (AAPM) report no. 28. We scanned the phantoms with three permanent magnet 0.5 T desktop MRI systems, measured the MRI image parameters, and analysed imaging quality by comparing the data with the AAPM criteria and Chinese national standards. Image parameters included: resonance frequency, high contrast spatial resolution, low contrast object detectability, slice thickness, geometrical distortion, signal-to-noise ratio (SNR), and image uniformity. The image parameters of three desktop MRI machines could be measured using our specially designed phantoms, and most parameters were in line with MRI quality control criterion, including: resonance frequency, high contrast spatial resolution, low contrast object detectability, slice thickness, geometrical distortion, image uniformity and slice position accuracy. However, SNR was significantly lower than in some references. The imaging test and quality control are necessary for desktop MRI systems, and should be performed with the applicable phantom and corresponding standards.

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Section: Phantommentioning

confidence: 99%

“…Small MRI scanners often have a narrow bore and a small volume and are used in basic medical research, for example the desktop MRI system shown in figure 1. It is essential that the image quality of desktop MRI machines is properly tested for both QA and QC (Wright et al 2010, Yoshimaru et al 2013.…”

Section: Introductionmentioning

confidence: 99%

Testing the quality of images for permanent magnet desktop MRI systems using specially designed phantoms

Qiu¹,

Wang²,

Jiao³

et al. 2013

Phys. Med. Biol.

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“…These spectrometers were based on the use of general-purpose commercial data acquisition boards (DAQ) from National Instruments (Austin, TX, USA). Based on DAQ boards, an NMR system at 0.1 T for educational purposes was also presented in [ 5 ]. Another NMR spectrometer with fully analog electronics has been proposed for the NMR of hyperpolarized helium ( 3 He).…”

Section: Introductionmentioning

confidence: 99%

Software Defined Radio (SDR) and Direct Digital Synthesizer (DDS) for NMR/MRI Instruments at Low-Field

Asfour

Raoof

Yonnet

2013

Sensors

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A proof-of-concept of the use of a fully digital radiofrequency (RF) electronics for the design of dedicated Nuclear Magnetic Resonance (NMR) systems at low-field (0.1 T) is presented. This digital electronics is based on the use of three key elements: a Direct Digital Synthesizer (DDS) for pulse generation, a Software Defined Radio (SDR) for a digital receiving of NMR signals and a Digital Signal Processor (DSP) for system control and for the generation of the gradient signals (pulse programmer). The SDR includes a direct analog-to-digital conversion and a Digital Down Conversion (digital quadrature demodulation, decimation filtering, processing gain…). The various aspects of the concept and of the realization are addressed with some details. These include both hardware design and software considerations. One of the underlying ideas is to enable such NMR systems to “enjoy” from existing advanced technology that have been realized in other research areas, especially in telecommunication domain. Another goal is to make these systems easy to build and replicate so as to help research groups in realizing dedicated NMR desktops for a large palette of new applications. We also would like to give readers an idea of the current trends in this field. The performances of the developed electronics are discussed throughout the paper. First FID (Free Induction Decay) signals are also presented. Some development perspectives of our work in the area of low-field NMR/MRI will be finally addressed.

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“…These magnets can however be divided into two categories 2 : permanent magnets and electromagnets. Permanent magnet of 0.08 T has been used in the development of an MR imager for education purposes (Wright et al, 2010). Permanent magnets with a typical field of 0.1 T have also potential industrial applications (quality control of food products) (Asfour et al 2004).…”

Section: Magnetic Field Production: the Helmholtz Coils For Low And Vmentioning

confidence: 99%

Low-Field NMR/MRI Systems Using LabVIEW and Advanced Data-Acquisition Techniques

Asfour¹

2011

Practical Applications and Solutions Using LabVIEW™ Software

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A desktop imaging system for teaching MR engineering

Cited by 4 publications

References 1 publication

Testing the quality of images for permanent magnet desktop MRI systems using specially designed phantoms

Testing the quality of images for permanent magnet desktop MRI systems using specially designed phantoms

Software Defined Radio (SDR) and Direct Digital Synthesizer (DDS) for NMR/MRI Instruments at Low-Field

Low-Field NMR/MRI Systems Using LabVIEW and Advanced Data-Acquisition Techniques

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