MRI safety | KAPTEOS

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measurement, mesure, champ electrique, electric field, IRM mesure de champ électrique compatibilité implant, electric field probe measurement medical implant

MRI safety

Since interference-free and ultra compact electric-field probes allow measurements without any induced artifact on the magnetic field gradient generated by MRI machines, KAPTEOS solution meets the needs of electric field measurement inside any MRI machine, regardless their brand and their nominal magnetic field (1.5T, 3T, 4.7T, ...). Such measurements are of key importance to assess the compatibility of medical implants with MRI scans, and more broadly with MRI safety.

KAPTEOS has conducted many studies and manufactured numerous systems on behalf of its clients: time-resolved dosimetric measurements inside different biological media and tissues during a MRI scan, specific absorption rate (SAR) assessment in phantoms.

Case studies

Frequency-domain pulse measurement

by L. DUVILLARET/G. GABORIT

(AN24-FDPM-09)

Measuring gated-CW pulses in the frequency domain is not straightforward especially when considering weak signals. Using a spectrum analyzer as demodulator, the envelope of the pulses can be carried out. However, the recommended setup requires a signal generator with a trigger output which is usually not a native feature. To overcome that issue, a low frequency generator is added. With a robust model of the spectrum analyzer behavior, accurate measurements of peak signal amplitude only 1 dB above noise floor is achievable.

Time-domain measurement of EM pulses in MRI

using a spectrum analyzer

by G. GABORIT

(AN22-MRI-01)

The measurement of ElectroMagnetic (EM) pulses generated by a MRI apparatus inside phantoms is of key importance for MRI safety. This latter one is related either to the local temperature increase of the phantom or to the RMS value of the local Electric (E) field, this latter physical quantity being much more easy to assess thanks to the use of appropriate E-field sensors...

Electric field probe calibration

by L. DUVILLARET

(AN21-EFPC-04)

Electric (E) field probes need to be calibrated in order to get absolute E-field strength values. Contrary to other sensors (temperature, pressure...), the sensitivity of E-field probes depend on the medium in which the probe is placed. An E-field probe calibrated in air gives a wrong result when used inside water or inside any other liquid...

Use of eoCal™ HF6

by L. DUVILLARET

(AN21-eoCal-01)

Electric (E) field probes need to be calibrated in order to get absolute E-field strength values. Their calibration in air is straightforward for frequencies up to 6 GHz thanks to adiabatic TEM cell...

They use KAPTEOS technology for their R&D

List of publications

"Exploitation of electro-optical effects for safety in MRI: applications of optical links for endoluminal RF sensors and SBP measurement probes"

Isabelle SANIOUR Ph.D. Thesis

Creatis, Lyon (FR)

2017

"Electro‐optic probe for real‐time assessments of RF electric field produced in an MRI scanner: Feasibility tests at 3 and 4.7 T"

NMR in Biomedicine

Creatis, Lyon (FR)
IMEP-LAHC, Le Bourget-du-Lac (FR)

2017

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