Design of superconducting MRI surface coil by using method of moment

Fang, Jin; Chow, M.S.; Chan, K.C.D.; Wong, Kelvin; Shen, GG; Gao, Erzhen; Yang, E.S.; Ma, Qiangzhong

doi:10.1109/tasc.2002.1020344

Cited by 22 publications

(7 citation statements)

References 10 publications

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“…Therefore several collaborative detection methods of MRI combined with optical sensing are proposed by researchers [4,[9][10], and the magnetic susceptibility and the electrical conductivity of the optical elements and devices are MRI compatible. At the same time the surface coil technology, especially the superconductivity coil, can enhance the SNR and imaging result homogeneity [11][12][13][14], but the spatial overlapping and interference issues between surface coil and optical sensing system hinder the realization of collaborative detection.…”

Section: Introductionmentioning

confidence: 99%

A MRI compatible optical system and its respiration adaptive estimation method for hemoglobin concentration in mice brain

Deng¹,

Yang²,

Yan

2014

2014 IEEE Workshop on Electronics, Computer and Applications

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We propose a design of a integrated system of optic fibers and a superconducting surface coil. A MRI compatible support fixed the optic fiber and the coil, and the optic fibers installed through the air gap. In order to compensate the periodic errors of the hemoglobin concentration estimation produced by the respiration and heart rate of subj ects, we propose the generalized least square method to acquire the adaptive estimation, which considers the noise variance of the temporal optical measurements as a time-varying model. The vivo experiments that the optical-sensing simultaneously working with MRI scans are conducted to characterize the performance of this approach.

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Section: Introductionmentioning

confidence: 99%

A MRI compatible optical system and its respiration adaptive estimation method for hemoglobin concentration in mice brain

Deng¹,

Yang²,

Yan

2014

2014 IEEE Workshop on Electronics, Computer and Applications

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“…This design creates difficulties of constructing suitable platforms for in-vivo samples, plus positioning and handling these samples with flexibility, and monitoring their physiological condition with ease. Thirdly, since most cryogenic probe-heads are designed as small surface coils with radii ≤ 2 cm [10], it is desirable to employ another transmitter to provide a homogenous B 1 field and achieve the designed flip angle while utilizing the cryogenic coil as a highly sensitive receiver [1], [7]. Finally, up-to now, cryogenic probes have been only accessible to a few research groups due to the complexity of instrumentation.…”

Section: Introductionmentioning

confidence: 99%

A Novel Receive-Only Liquid Nitrogen ($\hbox{LN}_{2}$ )-Cooled RF Coil for High-Resolution In Vivo Imaging on a 3-Tesla Whole-Body Scanner

Varma

Randell

et al. 2012

IEEE Trans. Instrum. Meas.

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription.For more information, please contact eprints@nottingham.ac.uk Thomas's Hospital, Kings College, London; 3 Pulseteq Ltd., Wotton-under-Edge, Gloucestershire. Abstract:The design and operation of a receive-only liquid nitrogen (LN 2 ) cooled coil and cryostat suitable for medical image on 3T whole body MR scanner is presented. The coil size, optimised for murine imaging, was determined by using electromagnetic (EM) simulations. This process is therefore easier and more cost-effective than building a range of coils. A non-magnetic cryostat suitable for small animal imaging was developed having a good vacuum and cryogenic temperature performance. The cooled probe had an active detuning circuit allowing use with the scanner's built-in body coil. External tuning and matching was adopted to allow for changes to the coil due to temperature and loading. The performance of the probe was evaluated by comparison of signalto-noise (SNR) performance with the same radio-frequency (RF) coil operating at room temperature (RT). The performance of the RF coil at RT was also benchmarked against a commercial surface coil with similar dimensions to ensure a fair SNR comparison. The cryogenic coil achieved a 1.6 -2 fold SNR gain for several different medical image applications: For the mouse brain image, a 100 μm resolution was achieved in an imaging time of 3 minutes with an SNR of 25-40, revealing finer anatomical details unseen at lower resolution in the same time. For other heavy loading condition, such as hind legs and liver, the SNR enhancement was slightly reduced to 1.6 fold. The observed SNR was in good agreement with the expected SNR gain correlated to the loaded quality factor of RF coils from EM simulations. With the aid of this enduser friendly and economically attractive cryogenic RF coil, the enhanced SNR available can be used to improve resolution or reduce time of individual scans in a number of biomedical applications.Introduction:

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“…This means HTS coils usually have a limited field-of-view (FOV) which is insufficient for most clinical applications in low-field MRI, except for local imaging of human body parts such as the brain (5, 9, 13), the finger (9), the knee (12), the orbit (7, 13), the spine (8), the temporomandibular joint (TMJ) (10,13), and the wrist (9,11,13,14). SNR gains of 2.0-4.0 had been reported in these local imaging experiments when cryogenically cooled HTS coils were used to replace the equivalent room temperature copper coils.…”

Section: Introductionmentioning

confidence: 99%

A high temperature superconducting imaging coil for low‐field MRI

Cheong

Wild

Alford

et al. 2010

Concepts Magn Reson

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ABSTRACT:In low field MRI (<0.5T), the signal-to-noise ratio (SNR) is predominantly degraded by thermal noise due to the electrical resistance of the imaging coil. This means using an imaging coil made of materials with a low intrinsic resistivity such as high temperature superconductors (HTS) should improve the SNR significantly when compared to an equivalent copper coil. The aim of this study was to perform a quantitative analysis on the performance of a cryogenically-cooled HTS coil in low field MRI. A 70 mm circular spiral HTS resonator was fabricated by using YBa 2 Cu 3 O 7 (YBCO) onto a sapphire substrate. The HTS coil was placed inside a cryogenic Dewar flask made of G10 materials to allow cooling using liquid nitrogen. A copper coil with the same layout was also fabricated to provide reference data for SNR comparisons. From the quality factor (Q) measurement results, the cryogenically-cooled HTS coil was estimated to give SNR gains of 4.0 and 1.9 when compared to the copper coil at room temperature (292 K) and at the same cryogenic temperature (81.5 K) respectively. The phantom imaging results showed good agreement with these estimations in which SNR gains of 3.7 and 1.8 were recorded for the same comparisons. Similar SNR gains of 3.2 and 1.8 were also measured from invivo hand imaging results, confirming the advantage of HTS coils over equivalent copper coils in low field MRI. Meanwhile, the SNR gain of the HTS coil against the room temperature copper coil dropped to 1.8 when the coil-to-sample separation in the latter setup was minimized to around 1 mm.

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Design of superconducting MRI surface coil by using method of moment

Cited by 22 publications

References 10 publications

A MRI compatible optical system and its respiration adaptive estimation method for hemoglobin concentration in mice brain

A MRI compatible optical system and its respiration adaptive estimation method for hemoglobin concentration in mice brain

A Novel Receive-Only Liquid Nitrogen ($\hbox{LN}_{2}$ )-Cooled RF Coil for High-Resolution In Vivo Imaging on a 3-Tesla Whole-Body Scanner

A high temperature superconducting imaging coil for low‐field MRI

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