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15 results on '"Saniour, I."'

1. Endoluminal coil-sensitivity degradation with the coil-orientation effect with respect to B0 field: preliminary results

Author

Raki, Hamza, Lambert, Simon A., Tse-Ve-Koon, Kevin, Souchay, H., Robb, F., Saniour, I., Beuf, O., RMN et optique : De la mesure au biomarqueur, Centre de Recherche en Acquisition et Traitement de l'Image pour la Santé (CREATIS), Université Jean Monnet [Saint-Étienne] (UJM)-Hospices Civils de Lyon (HCL)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Jean Monnet [Saint-Étienne] (UJM)-Hospices Civils de Lyon (HCL)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM), and General Electric Healthcare (Entreprise) (GE Healthcare)

Subjects
[SDV.IB.IMA]Life Sciences [q-bio]/Bioengineering/Imaging, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2018

2. Comparison of single-loop endoluminal receiver coils based on serial or parallel active decoupling circuits using controllable MEMS switches

Author

Raki, Hamza, Saniour, I., Robb, F., Tse-Ve-Koon, Kevin, Souchay, H., Lambert, Simon A., Beuf, O., RMN et optique : De la mesure au biomarqueur, Centre de Recherche en Acquisition et Traitement de l'Image pour la Santé (CREATIS), Université Jean Monnet [Saint-Étienne] (UJM)-Hospices Civils de Lyon (HCL)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Jean Monnet [Saint-Étienne] (UJM)-Hospices Civils de Lyon (HCL)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM), and General Electric Healthcare (Entreprise) (GE Healthcare)

Subjects
[SDV.IB.IMA]Life Sciences [q-bio]/Bioengineering/Imaging, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2018

4. Characterization and comparison of RF MEMS switch for active detuning of endoluminal receiver coils

Author

Raki, Hamza, Saniour, I., Robb, F., Souchay, H., Lambert, S.A., Beuf, Olivier, RMN et optique : De la mesure au biomarqueur, Centre de Recherche en Acquisition et Traitement de l'Image pour la Santé (CREATIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Hospices Civils de Lyon (HCL)-Université Jean Monnet [Saint-Étienne] (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Hospices Civils de Lyon (HCL)-Université Jean Monnet [Saint-Étienne] (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), and General Electric Healthcare (Entreprise) (GE Healthcare)

Subjects
Condensed Matter::Quantum Gases, [SDV.IB.IMA]Life Sciences [q-bio]/Bioengineering/Imaging, Physics::Atomic Physics
Abstract

International audience; The use of receiver endoluminal coils is an attractive solution to achieve locally high spatial resolution in deep regions in the body such as colon wall1. During the radiofrequency (RF) transmit phase, the receiver-coil must be detuned from the RF transmitter-coil to avoid inhomogeneity of the RF magnetic field in proximity and the extra noise in the image due to the mutual inductance between coils2. For this purpose, several detuning methods were proposed in literature such as active detuning based on PINdiode (galvanic)3 or optical connection4. Recently, Micro-Electro-Mechanical-Systems (MEMS) switch(GE Healthcare) was introduced5 to have a fast detuning and a higher SNR6. The purpose of this work was to compare the tuning/detuning characteristics of three detuning circuits and their impacts on the coil performances.

Published
2017

5. Endoluminal coils: Active decoupling and sensitivity dependence regarding coil orientation

Author

Raki, H., Saniour, I., Robb, F., Tse Ve Koon, K., Souchay, H., Lambert, S.A., Beuf, O., RMN et optique : De la mesure au biomarqueur, Centre de Recherche en Acquisition et Traitement de l'Image pour la Santé (CREATIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Hospices Civils de Lyon (HCL)-Université Jean Monnet [Saint-Étienne] (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Hospices Civils de Lyon (HCL)-Université Jean Monnet [Saint-Étienne] (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), and General Electric Healthcare (Entreprise) (GE Healthcare)

Subjects
[SDV.IB.IMA]Life Sciences [q-bio]/Bioengineering/Imaging, [INFO.INFO-IM]Computer Science [cs]/Medical Imaging, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017

6. Comparison of endoluminal receiver coils based on PIN-diode, photodiodes and MEMS switches for active detuning circuits

Author

Raki, H., Saniour, I., Robb, F., Tse Ve Koon, K., Souchay, H., Lambert, S.A., Beuf, O., RMN et optique : De la mesure au biomarqueur, Centre de Recherche en Acquisition et Traitement de l'Image pour la Santé (CREATIS), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Hospices Civils de Lyon (HCL)-Université Jean Monnet [Saint-Étienne] (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Hospices Civils de Lyon (HCL)-Université Jean Monnet [Saint-Étienne] (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), and General Electric Healthcare (Entreprise) (GE Healthcare)

Subjects
[SDV.IB.IMA]Life Sciences [q-bio]/Bioengineering/Imaging, [INFO.INFO-IM]Computer Science [cs]/Medical Imaging, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2017

8. Optical for both active decoupling and conversion/transmission for a MR endoluminal coil

Author

Saniour , I., Aydé , R., Perrier , A.-L., Gaborit , G., Dorez , H., Duvillaret , L., Dahdah , J., Sablong , R., Beuf , O., 5 - RMN et optique : De la mesure aux biomarqueurs, Centre de Recherche en Acquisition et Traitement de l'Image pour la Santé ( CREATIS ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon ( INSA Lyon ), Université de Lyon-Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées ( INSA ) -Hospices Civils de Lyon ( HCL ) -Université Jean Monnet [Saint-Étienne] ( UJM ) -Institut National de la Santé et de la Recherche Médicale ( INSERM ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Institut National des Sciences Appliquées ( INSA ) -Institut National des Sciences Appliquées ( INSA ) -Hospices Civils de Lyon ( HCL ) -Université Jean Monnet [Saint-Étienne] ( UJM ) -Institut National de la Santé et de la Recherche Médicale ( INSERM ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de Microélectronique, Electromagnétisme et Photonique - Laboratoire d'Hyperfréquences et Caractérisation ( IMEP-LAHC ), Université Joseph Fourier - Grenoble 1 ( UJF ) -Institut polytechnique de Grenoble - Grenoble Institute of Technology ( Grenoble INP ) -Institut National Polytechnique de Grenoble ( INPG ) -Université Savoie Mont Blanc ( USMB [Université de Savoie] [Université de Chambéry] ) -Centre National de la Recherche Scientifique ( CNRS ) -Université Grenoble Alpes ( UGA ), Kapteos SAS, RMN et optique : De la mesure au biomarqueur, Centre de Recherche en Acquisition et Traitement de l'Image pour la Santé (CREATIS), Université Jean Monnet [Saint-Étienne] (UJM)-Hospices Civils de Lyon (HCL)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université de Lyon-Institut National des Sciences Appliquées (INSA)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Université Jean Monnet [Saint-Étienne] (UJM)-Hospices Civils de Lyon (HCL)-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de la Santé et de la Recherche Médicale (INSERM), Institut de Microélectronique, Electromagnétisme et Photonique - Laboratoire d'Hyperfréquences et Caractérisation (IMEP-LAHC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National Polytechnique de Grenoble (INPG)-Centre National de la Recherche Scientifique (CNRS), Rayet, Béatrice, Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National des Sciences Appliquées de Lyon (INSA Lyon), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Hospices Civils de Lyon (HCL)-Université Jean Monnet - Saint-Étienne (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Hospices Civils de Lyon (HCL)-Université Jean Monnet - Saint-Étienne (UJM)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS), and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National Polytechnique de Grenoble (INPG)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDV.IB.IMA] Life Sciences [q-bio]/Bioengineering/Imaging, [SDV.IB.IMA]Life Sciences [q-bio]/Bioengineering/Imaging, [SPI.TRON] Engineering Sciences [physics]/Electronics, [ SDV.IB.IMA ] Life Sciences [q-bio]/Bioengineering/Imaging, [SPI.TRON]Engineering Sciences [physics]/Electronics
Abstract

International audience; Purpose / IntroductionAn accurate and early detection of the stages of colorectal cancer increases patient survival rates. Spatial resolution of MR images can be improved by using endoluminal coils close to the region of interest [1]. Unfortunately, the clinical use of such coils, deeply introduced in the patient is compromised due to local heating and safety issues in presence of galvanic wires [2]. In the following work, adequate optical solutions both for active decoupling and conversion/transmission of MR signals is proposed and demonstrated.

Published
2015

9. Optical For Both Active Decoupling And Conversion/Transmission For A Mr Endoluminal Coil

Author

Saniour, I., Aydé, R., Perrier, A.-L., Gaborit, G., Dorez, H., Duvillaret, L., Dahdah, J., Sablong, R., and Beuf, O.

Subjects
3. Good health
Abstract

Purpose / IntroductionAn accurate and early detection of the stages of colorectal cancer increases patient survival rates. Spatial resolution of MR images can be improved by using endoluminal coils close to the region of interest [1]. Unfortunately, the clinical use of such coils, deeply introduced in the patient is compromised due to local heating and safety issues in presence of galvanic wires [2]. In the following work, adequate optical solutions both for active decoupling and conversion/transmission of MR signals is proposed and demonstrated.

10. Optical for both active decoupling and conversion/transmission for a MR endoluminal coil

Author

Saniour, I., Aydé, R., Perrier, A.-L., Gaborit, G., Dorez, H., Duvillaret, L., Dahdah, J., Sablong, R., and Beuf, O.

Subjects
3. Good health
Abstract

Purpose / IntroductionAn accurate and early detection of the stages of colorectal cancer increases patient survival rates. Spatial resolution of MR images can be improved by using endoluminal coils close to the region of interest [1]. Unfortunately, the clinical use of such coils, deeply introduced in the patient is compromised due to local heating and safety issues in presence of galvanic wires [2]. In the following work, adequate optical solutions both for active decoupling and conversion/transmission of MR signals is proposed and demonstrated.

11. All polymer cryogen free cryostat for ?-MRI application at clinical field

Author

Authelet, G, Bonelli, A, Poirier, M, Ginefri, C, Saniour, I, and Baudouy, B

Abstract

To improve the detection sensitivity of Micro Magnetic Resonance Imaging (u-MRI) in humans, small animals or biological sample, it is necessary to reach higher spatial resolution. Radio Frequency (RF) YBaCuO film coils, in superconducting state, are used for that purpose, instead of copper coils. In working condition, these miniature RF coils are located in clinical MRI scanners (few Tesla) and very closed to the biological sample under investigation. A non magnetic cryostat has been designed and constructed to operate these RF coils in this particular medical environment. This cryostat is principally made of polymer materials to reduce the electromagnetic perturbations to the MRI magnet and the cryogenic scheme has been chosen to be cryogen free. In this paper, we describe the cryostat and present the experimental thermal characterizations and the first images obtained in a clinical MRI scanner.

Published
2019

12. Characterization of a Low-Profile, Flexible, and Acoustically Transparent Receive-Only MRI Coil Array for High Sensitivity MR-Guided Focused Ultrasound.

Author

Saniour I, Robb FJL, Taracila V, Mishra V, Vincent J, Voss HU, Kaplitt MG, Chazen JL, and Winkler SA

Abstract

Magnetic resonance guided focused ultrasound (MRgFUS) is a non-invasive therapeutic modality for neurodegenerative diseases that employs real-time imaging and thermometry monitoring of targeted regions. MRI is used in guidance of ultrasound treatment; however, the MR image quality in current clinical applications is poor when using the vendor built-in body coil. We present an 8-channel, ultra-thin, flexible, and acoustically transparent receive-only head coil design (FUS-Flex) to improve the signal-to-noise ratio (SNR) and thus the quality of MR images during MRgFUS procedures. Acoustic simulations/experiments exhibit transparency of the FUS-Flex coil as high as 97% at 650 kHz. Electromagnetic simulations show a SNR increase of 13× over the body coil. In vivo results show an increase of the SNR over the body coil by a factor of 7.3 with 2× acceleration (equivalent to 11× without acceleration) in the brain of a healthy volunteer, which agrees well with simulation. These preliminary results show that the use of a FUS-Flex coil in MRgFUS surgery can increase MR image quality, which could yield improved focal precision, real-time intraprocedural anatomical imaging, and real-time 3D thermometry mapping.

Published
2022
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13. Feasibility and characterization of a safe susceptibility-matched endorectal coil for MR spectroscopy.

Author

Saniour I, Verret JM, Rabrait-Lerman C, Pilleul F, and Beuf O

Subjects
Feasibility Studies, Humans, Phantoms, Imaging, Radio Waves, Signal-To-Noise Ratio, Magnetic Resonance Spectroscopy, Rectum diagnostic imaging
Abstract

When using endorectal coils, local radiofrequency (RF) heating may occur in the surrounding tissue. Furthermore, most endorectal coils create a susceptibility artifact detrimental to both anatomical magnetic resonance imaging (MRI) and spectroscopy (MRS) acquisitions. We aimed at assessing the safety and MRS performance of a susceptibility-matched endorectal coil for further rectal wall analysis. Experiments were performed on a General Electric MR750 3 T scanner. A variable number of miniaturized passive RF traps were incorporated in the reception cable. The assessment of RF heating and coil sensitivity was conducted on a 1.5% agar-agar phantom doped with NaCl. Several susceptibility-matched materials such as Ultem, perfluorocarbon and barium sulfate were then compared with an external coil. Finally, Ultem was used as a solid support for an endorectal coil and compared with a reference coil. Phantom experiments exhibited a complete suppression of both the RF heating phenomenon and the coil sensitivity artifact. Ultem was the material that produced the smallest image distortion. The full width at half maximum of MR spectra acquired using the susceptibility-matched endorectal coil showed at least 30% narrowing compared with a reference endorectal coil. A susceptibility-matched endorectal coil with RF traps incorporated was validated on phantoms. This coil appears to be a promising device for future in vivo experiments., (© 2020 John Wiley & Sons, Ltd.)

Published
2020
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14. A temperature-controlled cryogen free cryostat integrated with transceiver-mode superconducting coil for high-resolution magnetic resonance imaging.

Author

Saniour I, Authelet G, Baudouy B, Dubuisson RM, Jourdain L, Willoquet G, Darrasse L, Ginefri JC, and Poirier-Quinot M

Abstract

Small-sized High Temperature Superconducting (HTS) radiofrequency coils are used in a number of micro-magnetic resonance imaging applications and demonstrate a high detection sensitivity that improves the signal-to-noise ratio. However, the use of HTS coils could be limited by the rarity of cryostats that are suitable for the MR environment. This study presents a magnetic resonance (MR)-compatible and easily operated cryogen-free cryostat based on the pulse tube cryocooler technology for the cooling and monitoring of HTS coils below the temperature of liquid nitrogen. This cryostat features a real-time temperature control function that allows the precise frequency adjustment of the HTS coil. The influence of the temperature on the electrical properties, resonance frequency (f 0 ), and quality factor (Q) of the HTS coil was investigated. Temperature control is obtained with an accuracy of over 0.55 K from 60 K to 86 K, and the sensitivity of the system, extracted from the frequency measurement from 60 K to 75 K, is of about 2 kHz/K, allowing a fine retuning (within few Hz, compared to 10 kHz bandwidth) in good agreement with experimental requirements. We demonstrated that the cryostat, which is mainly composed of non-magnetic materials, does not perturb the electromagnetic field in any way. MR images of a 10 × 10 × 15 mm 3 liquid phantom were acquired using the HTS coil as a transceiver with a spatial resolution of 100 × 100 × 300 µm 3 in less than 20 min under experimental conditions at 1.5 T.

Published
2020
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15. Electro-optic probe for real-time assessments of RF electric field produced in an MRI scanner: Feasibility tests at 3 and 4.7 T.

Author

Saniour I, Gaborit G, Perrier AL, Gillette L, Revillod G, Sablong R, Duvillaret L, and Beuf O

Subjects
Crystallization, Feasibility Studies, Humans, Magnetic Fields, Signal-To-Noise Ratio, Electricity, Magnetic Resonance Imaging instrumentation, Optical Phenomena, Radio Waves
Abstract

During magnetic resonance imaging (MRI) examinations, the average specific absorption rate (SAR) of the whole body is calculated as an index of global energy deposition in biological tissue without taking into account the presence of metallic implants or conductive materials. However, this global SAR calculation is not sufficient to ensure patient safety and a local SAR measurement should be carried out. Several measurement techniques have already been used to evaluate the local SAR, in particular electric field (E-field) probes, but the accuracy of the measurements and the resolutions (spatial and temporal) depend strongly on the measurement method/probe. This work presents an MR-compatible, subcentimeter probe based on an electro-optic (EO) principle enabling a real-time measurement of the local E-field during MRI scans. The experiments using these probes were performed on two different MR systems (preclinical and clinical) having different static magnetic field strengths and with different volume coil geometries. The E-field was measured with unloaded (in air) and loaded volume coils in order to assess the sensing characteristics of the optical probe. The results show an excellent linearity between the measured E-field and the radiofrequency (RF) magnetic field in both experimental conditions. Moreover, the distribution of the E-field throughout the volume coil was experimentally determined and was in good agreement with numerical simulations. Finally, we demonstrate through our measurements that the E-field depends strongly on the dielectric properties of the medium., (Copyright © 2017 John Wiley & Sons, Ltd.)

Published
2018
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