Development of a compact MRI system for measuring the trabecular bone microstructure of the finger

Iita, Nachiko; Handa, Shinya; Tomiha, Sadanori; Kose, Katsumi

doi:10.1002/mrm.21130

Cited by 26 publications

(13 citation statements)

References 26 publications

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“…7,[13][14][15] Because those systems are supposed to be used in indoor environments such as hospitals, their wheels were designed to be used on smooth floors and to be moved manually. However, this design is not suitable for outdoor field measurements.…”

Section: Discussionmentioning

confidence: 99%

Development of a mobile magnetic resonance imaging system for outdoor tree measurements

Kimura

Geya

Terada

et al. 2011

Review of Scientific Instruments

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By combining a 0.3 T permanent magnet with flexible rotation and translation mechanism, a probe with a local electromagnetic shielding, several electrical units, a mobile lift, and an electric wagon, a mobile magnetic resonance imaging (MRI) system was developed for outdoor tree measurements. 2D cross-sectional images of normal and diseased branches of a pear tree were acquired for measurements of T 1 , T 2 , proton density, and apparent diffusion constant (ADC). The ADC map clearly differentiated diseased from normal branches. A whole-day measurement of the ADC map demonstrated that microscopic water flow in the normal branch changed proportionally with solar radiation. Therefore, we have concluded that our mobile MRI system is a powerful tool for studies of plants in outdoor environments.

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Section: Discussionmentioning

confidence: 99%

Development of a mobile magnetic resonance imaging system for outdoor tree measurements

Kimura

Geya

Terada

et al. 2011

Review of Scientific Instruments

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“…However, when special purpose NMR or MRI systems are required, such as for portability, on-line monitoring, or educational purposes, custom-built NMR/MRI systems are desirable. [1][2][3][4][5][6] In developing a custom-built MRI system, the pulse programmer (PPG) is the key unit to be developed. This is because magnets, gradient probes, transmitters, preamplifiers, AD converter boards, and modulator/detector modules and chips are commercially available, whereas a PPG for MRI systems is very difficult to obtain commercially.…”

Section: Several Major Companies Now Supply Advanced and Sophisticatementioning

confidence: 99%

Single-chip pulse programmer for magnetic resonance imaging using a 32-bit microcontroller

Handa

Domalain

Kose

2007

Review of Scientific Instruments

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An MRI pulse programmer has been developed using a single-chip microcontroller (ADμC7026). The microcontroller includes all the components required for the MRI pulse programmer: a 32-bit RISC CPU core, 62 Kbytes of flash memory, 8 Kbytes of SRAM, two 32-bit timers, four 12-bit DA converters, and 40 bits of general purpose I/O. An evaluation board for the microcontroller was connected to a host PC, an MRI transceiver, and a gradient driver using interface circuitry. Target (embedded) and host PC programs were developed to enable MRI pulse sequence generation by the microcontroller. The pulse programmer achieved a (nominal) time resolution of approximately 100 ns and a minimum time delay between successive events of approximately 9 μs. Imaging experiments using the pulse programmer demonstrated the effectiveness of our approach.-1-

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“…To overcome this disadvantage, compact MR imaging systems have been developed to measure TB microstructure of theˆnger 6 and distal radius 7 .…”

Section: Introductionmentioning

confidence: 99%

In Vivo Assessment of the Trabecular Bone Microstructure of the Distal Radius Using a Compact MRI System

et al. 2009

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We repeatedly measured the trabecular bone (TB) microstructure of the distal radius in 5 healthy volunteers using a compact magnetic resonance (MR) imaging system to evaluate the reproducibility of the TB structural parameters. The compact system was specially developed with a 1.0-tesla permanent magnet for the distal radius in a previous study. We measured the distal radius using a 3-dimensional (3D), driven-equilibrium, spin-echo sequence (repetition time/echo time＝80 ms/10 ms, number of excitations＝1,ˆeld of view ＝76.8 mm×57.6 mm×16.0 mm, acquisition time＝17 min, matrix size＝512×384×32, voxel size＝150 mm×150 mm×500 mm) and analyzed the acquired image datasets using the virtual bone biopsy system developed by the University of Pennsylvania. Root mean squares of the coe‹cients of variance expressed as percentages ranged from 2.9z to 14z for the TB structural parameters. Therefore, we concluded that this compact MR imaging system could be used to assess TB microstructure of the distal radius and provide results consistent with those using a whole-body MR imaging system and showing the promise of this system for evaluating bone quality in clinical settings.

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Development of a compact MRI system for measuring the trabecular bone microstructure of the finger

Cited by 26 publications

References 26 publications

Development of a mobile magnetic resonance imaging system for outdoor tree measurements

Development of a mobile magnetic resonance imaging system for outdoor tree measurements

Single-chip pulse programmer for magnetic resonance imaging using a 32-bit microcontroller

In Vivo Assessment of the Trabecular Bone Microstructure of the Distal Radius Using a Compact MRI System

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