Ultra-Low Field MRI Food Inspection System Using HTS-SQUID with Flux Transformer

Saburo TANAKA; Satoshi KAWAGOE; Kazuma DEMACHI; Junichi HATTA

doi:10.1587/transele.E101.C.680

Ultra-Low Field MRI Food Inspection System Using HTS-SQUID with Flux Transformer

Saburo TANAKA, Satoshi KAWAGOE, Kazuma DEMACHI, Junichi HATTA

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We are developing an Ultra-Low Field (ULF) Magnetic Resonance Imaging (MRI) system with a tuned high-Tc (HTS)-rf-SQUID for food inspection. We previously reported that a small hole in a piece of cucumber can be detected. The acquired image was based on filtered back-projection reconstruction using a polarizing permanent magnet. However the resolution of the image was insufficient for food inspection and took a long time to process. The purpose of this study is to improve image quality and shorten processing time. We constructed a specially designed cryostat, which consists of a liquid nitrogen tank for cooling an electromagnetic polarizing coil (135mT) at 77K and a room temperature bore. A Cu pickup coil was installed at the room temperature bore and detected an NMR signal from a sample. The signal was then transferred to an HTS SQUID via an input coil. Following a proper MRI sequence, spatial frequency data at 64×32 points in k-space were obtained. Then, a 2D-FFT (Fast Fourier Transformation) method was applied to reconstruct the 2D-MR images. As a result, we successfully obtained a clear water image of the characters “TUT”, which contains a narrowest width of 0.5mm. The imaging time was also shortened by a factor of 10 when compared to the previous system.

Publication: IEICE TRANSACTIONS on Electronics Vol.E101-C No.8 pp.680-684

Publication Date: 2018/08/01

Publicized

Online ISSN: 1745-1353

DOI: 10.1587/transele.E101.C.680

Type of Manuscript: PAPER

Category: Superconducting Electronics

Authors

Saburo TANAKA
  Toyohashi University of Technology
Satoshi KAWAGOE
  Toyohashi University of Technology
Kazuma DEMACHI
  Toyohashi University of Technology
Junichi HATTA
  Toyohashi University of Technology

Keyword

high-Tc SQUID, ultra-low field MRI, food inspection, LC resonator, 2D-FFT

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Saburo TANAKA, Satoshi KAWAGOE, Kazuma DEMACHI, Junichi HATTA, "Ultra-Low Field MRI Food Inspection System Using HTS-SQUID with Flux Transformer" in IEICE TRANSACTIONS on Electronics, vol. E101-C, no. 8, pp. 680-684, August 2018, doi: 10.1587/transele.E101.C.680.
Abstract: We are developing an Ultra-Low Field (ULF) Magnetic Resonance Imaging (MRI) system with a tuned high-Tc (HTS)-rf-SQUID for food inspection. We previously reported that a small hole in a piece of cucumber can be detected. The acquired image was based on filtered back-projection reconstruction using a polarizing permanent magnet. However the resolution of the image was insufficient for food inspection and took a long time to process. The purpose of this study is to improve image quality and shorten processing time. We constructed a specially designed cryostat, which consists of a liquid nitrogen tank for cooling an electromagnetic polarizing coil (135mT) at 77K and a room temperature bore. A Cu pickup coil was installed at the room temperature bore and detected an NMR signal from a sample. The signal was then transferred to an HTS SQUID via an input coil. Following a proper MRI sequence, spatial frequency data at 64×32 points in k-space were obtained. Then, a 2D-FFT (Fast Fourier Transformation) method was applied to reconstruct the 2D-MR images. As a result, we successfully obtained a clear water image of the characters “TUT”, which contains a narrowest width of 0.5mm. The imaging time was also shortened by a factor of 10 when compared to the previous system.
URL: https://global.ieice.org/en_transactions/electronics/10.1587/transele.E101.C.680/_p

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@ARTICLE{e101-c_8_680,
author={Saburo TANAKA, Satoshi KAWAGOE, Kazuma DEMACHI, Junichi HATTA, },
journal={IEICE TRANSACTIONS on Electronics},
title={Ultra-Low Field MRI Food Inspection System Using HTS-SQUID with Flux Transformer},
year={2018},
volume={E101-C},
number={8},
pages={680-684},
abstract={We are developing an Ultra-Low Field (ULF) Magnetic Resonance Imaging (MRI) system with a tuned high-Tc (HTS)-rf-SQUID for food inspection. We previously reported that a small hole in a piece of cucumber can be detected. The acquired image was based on filtered back-projection reconstruction using a polarizing permanent magnet. However the resolution of the image was insufficient for food inspection and took a long time to process. The purpose of this study is to improve image quality and shorten processing time. We constructed a specially designed cryostat, which consists of a liquid nitrogen tank for cooling an electromagnetic polarizing coil (135mT) at 77K and a room temperature bore. A Cu pickup coil was installed at the room temperature bore and detected an NMR signal from a sample. The signal was then transferred to an HTS SQUID via an input coil. Following a proper MRI sequence, spatial frequency data at 64×32 points in k-space were obtained. Then, a 2D-FFT (Fast Fourier Transformation) method was applied to reconstruct the 2D-MR images. As a result, we successfully obtained a clear water image of the characters “TUT”, which contains a narrowest width of 0.5mm. The imaging time was also shortened by a factor of 10 when compared to the previous system.},
keywords={},
doi={10.1587/transele.E101.C.680},
ISSN={1745-1353},
month={August},}

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TY - JOUR
TI - Ultra-Low Field MRI Food Inspection System Using HTS-SQUID with Flux Transformer
T2 - IEICE TRANSACTIONS on Electronics
SP - 680
EP - 684
AU - Saburo TANAKA
AU - Satoshi KAWAGOE
AU - Kazuma DEMACHI
AU - Junichi HATTA
PY - 2018
DO - 10.1587/transele.E101.C.680
JO - IEICE TRANSACTIONS on Electronics
SN - 1745-1353
VL - E101-C
IS - 8
JA - IEICE TRANSACTIONS on Electronics
Y1 - August 2018
AB - We are developing an Ultra-Low Field (ULF) Magnetic Resonance Imaging (MRI) system with a tuned high-Tc (HTS)-rf-SQUID for food inspection. We previously reported that a small hole in a piece of cucumber can be detected. The acquired image was based on filtered back-projection reconstruction using a polarizing permanent magnet. However the resolution of the image was insufficient for food inspection and took a long time to process. The purpose of this study is to improve image quality and shorten processing time. We constructed a specially designed cryostat, which consists of a liquid nitrogen tank for cooling an electromagnetic polarizing coil (135mT) at 77K and a room temperature bore. A Cu pickup coil was installed at the room temperature bore and detected an NMR signal from a sample. The signal was then transferred to an HTS SQUID via an input coil. Following a proper MRI sequence, spatial frequency data at 64×32 points in k-space were obtained. Then, a 2D-FFT (Fast Fourier Transformation) method was applied to reconstruct the 2D-MR images. As a result, we successfully obtained a clear water image of the characters “TUT”, which contains a narrowest width of 0.5mm. The imaging time was also shortened by a factor of 10 when compared to the previous system.
ER -