Potentialities of an Electro-Optic Crystal Fed by Nuclear Magnetic Resonant Coil for Remote and Low-Invasive Magnetic Field Characterization

Aydé, R.; Gaborit, Gwenaël; Jarrige, Pierre; Duvillaret, Lionel; Sablong, Raphaël; Perrier, Anne-Laure; Beuf, Olivier

doi:10.1109/jsen.2012.2230623

Cited by 8 publications

(11 citation statements)

References 9 publications

(8 reference statements)

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“…has been already analysed [16]. The results were in a very good agreement with the theoretical expectations.…”

supporting

confidence: 80%

“…This measurement allows to determine the minimum detectable magnetic field B min = 0.3 pT in the 30 Hz resolution bandwidth (RBW) leading to B min = 56 fT.Hz −1/2 . Furthermore, this measurement is compared to a similar setup involving a bulk LiTaO 3 crystal (4 mm thick) [16]. An increase in sensitivity is demonstrated and reaches more than 57 dB, without any additional amplification of the signal.…”

Section: The Electro-optic Resonant Coilmentioning

confidence: 97%

See 1 more Smart Citation

Unbiased Electro-Optic Waveguide as a Sensitive Nuclear Magnetic Resonance Sensor

Aydé

Gaborit

Dahdah

et al. 2014

IEEE Photon. Technol. Lett.

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International audienceA pigtailed Ti:LiNbO3 waveguide is here associated to a specific nuclear magnetic resonant coil to perform a low invasive magnetic field measurement. The developed device exploits a passive electro-optic transduction between the measured magnetic field and polarization state modulation of a laser probe beam. Because of the use of integrated optics, the coil electromotive force induces a dramatically enhanced electric field, thus leading to sensitivity improvement. A minimum detectable magnetic field lower than 60 fT. Hz-1/2 is achieved at the resonant frequency of 128 MHz. A dynamic range exceeding 100 dB is experimentally demonstrated

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“…has been already analysed [16]. The results were in a very good agreement with the theoretical expectations.…”

supporting

confidence: 80%

Section: The Electro-optic Resonant Coilmentioning

confidence: 97%

Unbiased Electro-Optic Waveguide as a Sensitive Nuclear Magnetic Resonance Sensor

Aydé

Gaborit

Dahdah

et al. 2014

IEEE Photon. Technol. Lett.

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“…With this low intensity, no elevation of the temperature was recorded using the detuning circuit. But in order to fully ensure patient safety, the developed active detuning system should be associated with an endoluminal coil with a novel optical method of NMR signal transmission (Aydé et al 2013, Aydé et al 2014. A number of optical systems for NMR signal transmission have already been built (Fandrey et al 2012, Koste et al 2005, Memis et al 2008, Possanzini et al 2011, Yuan et al 2007.…”

Section: Discussionmentioning

confidence: 99%

Active optical-based detuning circuit for receiver endoluminal coil

Saniour¹,

Aydé²,

Perrier³

et al. 2017

Biomed. Phys. Eng. Express

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In this paper we demonstrate the effectiveness of an active optical detuning circuit for magnetic resonance imaging (MRI) endoluminal receiver coil. Three endoluminal coils prototypes were built: a coil without any detuning circuit, a coil with a galvanic (classic) detuning circuit using a PIN diode, and a coil with an optical detuning circuit using two photodiodes in parallel with a PIN diode. These coils were built and characterized on a laboratory experimental bench. Then, an in vitro experiment was performed with a 3.0 T MR system to evaluate the impact of the endoluminal receiver coils in detuned phase on the image uniformity distribution measured using the body coil. Next, the endoluminal coil was used as a receiver coil to compare the signal-to-noise ratio (SNR) distribution based on iso-contour maps. On experimental bench, the results show an increase delay of the switching times (tuned-detuned or detuned-tuned) for optical-detuned coils of about 10 µs due to the electro-optical circuits, delay still compatible with requirements. When the body coil is used as a transceiver, the SNR uniformity is similar whether the galvanic or the optical detuning circuit is used. Finally, the SNR iso-contours of the different endoluminal coils prototypes are comparable.

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“…As the coaxial cable will also be inserted inside the patient's body it could burn tissues. To overcome this problem, promising preliminary studies have demonstrated the potential of optical fibers to transmit and receive RF signals to prevent burns …”

Section: Discussionmentioning

confidence: 99%

In vivo MRS for the assessment of mouse colon using a dedicated endorectal coil: initial findings

et al. 2017

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Inflammatory bowel disease is a common group of inflammation conditions that can affect the colon and the rectum. These pathologies require a careful follow-up of patients to prevent the development of colorectal cancer. Currently, conventional endoscopy is used to depict alterations of the intestinal walls, and biopsies are performed on suspicious lesions for further analysis (histology). MRS enables the in vivo analysis of biochemical content of tissues (i.e. without removing any samples). Combined with dedicated endorectal coils (ERCs), MRS provides new ways of characterizing alterations of tissues. An MRS in vivo protocol was specifically set up on healthy mice and on mice chemically treated to induce colitis. Acquisitions were performed on a 4.7 T system using a linear volume birdcage coil for the transmission of the B magnetic field, and a dedicated ERC was used for signal reception. Colon-wall complex, lumen and visceral fat were assessed on healthy and treated mice with voxel sizes ranging from 0.125 μL to 2 μL while keeping acquisition times below 3 min. The acquired spectra show various biochemical contents such as α- and β-methylene but also glycerol backbone and diacyl. Choline was detected in tumoral regions. Visceral fat regions display a high lipid content with no water, whereas colon-wall complex exhibits both high lipid and high water contents. To the best of our knowledge, this is the first time that in vivo MRS using an ERC has been performed in the assessment of colon walls and surrounding structures. It provides keys for the in vivo characterization of small local suspicious lesions and offers complementary solutions to biopsies.

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Potentialities of an Electro-Optic Crystal Fed by Nuclear Magnetic Resonant Coil for Remote and Low-Invasive Magnetic Field Characterization

Cited by 8 publications

References 9 publications

Unbiased Electro-Optic Waveguide as a Sensitive Nuclear Magnetic Resonance Sensor

Unbiased Electro-Optic Waveguide as a Sensitive Nuclear Magnetic Resonance Sensor

Active optical-based detuning circuit for receiver endoluminal coil

In vivo MRS for the assessment of mouse colon using a dedicated endorectal coil: initial findings

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