SNR in MI Catheter Receivers for MRI

Kardoulaki, Evdokia M.; Syms, R.R.A.; Young, I. R.; Rea, Marc

doi:10.1109/jsen.2015.2500226

Cited by 8 publications

(9 citation statements)

References 27 publications

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“…Figure 2(a) shows the circuit layout, which is based on a self-terminating MI waveguide [26,29]. The main section is a regular array of L-C resonators, magnetically coupled to their nearest neighbours.…”

Section: Electrical Designmentioning

confidence: 99%

“…Considerable efforts have also been made to develop endoscopes based on parallel wire media; however, demonstrated systems are still extremely bulky [23][24][25]. The closest analogue to conventional clinical tools is still the magneto-inductive (MI) catheter receiver [26][27][28][29]. This structure is based on a thin-film MI cable [30,31], a flexible form of a MI waveguide [32,33].…”

Section: Introductionmentioning

confidence: 99%

“…Its sensitivity reduces with radial distance r as 1/r 2 , and although its reception pattern is also segmented, it can obtain an image along its whole length (2 m) even when bent [26]. Comparison with external array coils has shown a SNR advantage up to several times the catheter diameter [29]. It may therefore have applications in high-resolution endolumenal imaging.…”

Section: Introductionmentioning

confidence: 99%

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Magneto-Inductive Magnetic Resonance Imaging Duodenoscope

Syms¹,

Kardoulaki²,

Rea³

et al. 2017

PIER

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Abstract-A magnetic resonance imaging (MRI) duodenoscope is demonstrated, by combining nonmagnetic endoscope components with a thin-film receiver based on a magneto-inductive waveguide. The waveguide elements consist of figure-of-eight shaped inductors formed on either side of a flexible substrate and parallel plate capacitors that use the substrate as a dielectric. Operation is simulated using equivalent circuit models and by computation of two-and three-dimensional sensitivity patterns. Circuits are fabricated for operation at 127.7 MHz by double-sided patterning of copper-clad Kapton and assembled onto non-magnetic flexible endoscope insertion tubes. Operation is verified by bench testing and by 1 H MRI at 3T using phantoms. The receiver can form a segmented coaxial image along the length of the endoscope, even when bent, and shows a signal-to-noise-ratio advantage over a surface array coil up to three times the tube diameter at the tip. Initial immersion imaging experiments have been carried out and confirm an encouraging lack of sensitivity to RF heating.

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Section: Electrical Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magneto-Inductive Magnetic Resonance Imaging Duodenoscope

Syms¹,

Kardoulaki²,

Rea³

et al. 2017

PIER

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“…Interstitial micro-coils have received considerable attention from the MRI and spectroscopy communities due to the local SNR gain they offer compared to surface array coils [168].…”

Section: General Limitations: Snr and Spatio-temporal Resolutionmentioning

confidence: 99%

MRI for Noninvasive Thermometry

Kardoulaki

Syms

Young

2016

eMagRes

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“…Thus, a GMI sensor has the advantages of higher sensitivity, lower power consumption, and simple sensor head structure for metal detection applications, despite its relatively higher internal noise level. GMI sensors use a magneto-inductive effect at low frequency ranging from 1 to 10 kHz [11], skin effect at high frequency ranging from 10 kHz to 1 GHz [12], and a ferromagnetic resonance effect at ultrahigh frequency that is >1 GHz [13]. Among these, the GMI sensor that uses a skin effect has the advantage of low power consumption and high resolution.…”

Section: Introductionmentioning

confidence: 99%

Metal Detection Sensor Utilizing Magneto-Impedance Magnetometer

Choi

2018

Journal of Sensors

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A magnetometer with a longitudinal sensing line using the MI effect was examined experimentally to find an application to replace conventional metal sensors based on an LVDT. A sampling to the second peak signal from the pickup coil on the sensing head with a long, thin soft magnetic ribbon and driven with an ultrashort pulse train with a pulse width of 5~7 ns formed the front end of the metal sensor. Unmatched degaussing and geomagnetic field compensation methods were effective not only to minimize the remnant magnetic field but also to prevent the saturation of the magnetic ribbon and expand the dynamic range. The active noise reduction process reduced the inherent noise to the 1/3 level with a minimum influence on the detection signal. The proposed metal sensor with unmatched degaussing, geomagnetic field compensation, and active noise reduction techniques demonstrated the detection of a 0.2 mm diameter magnetized ferrous ball.

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SNR in MI Catheter Receivers for MRI

Cited by 8 publications

References 27 publications

Magneto-Inductive Magnetic Resonance Imaging Duodenoscope

Magneto-Inductive Magnetic Resonance Imaging Duodenoscope

MRI for Noninvasive Thermometry

Metal Detection Sensor Utilizing Magneto-Impedance Magnetometer

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