In magnetic resonance imaging (MRI), the real time measurement of RF electrical field E associated with the RF magnetic field B1 is important to quantify the energy absorbed by the tissues and to assess possible safety hazards due to local heating phenomenon.
Based on optical rectiﬁcation in a ZnTe crystal, a terahertz vectorial antenna is here theoretically and experimentally demonstrated. The use of the particular orientation leads to a polarization state angle tunable THz source.
Despite technical MRI improvements, spatial resolution and achievable image quality with external coil are still limited for the examination of deep regions. It has been demonstrated that an endoluminal (internal) coil provides an important increase in local signal to noise ratio (SNR), and enables very high resolution images.
Single Shot and Vectorial Characterization of Intense Electric Field With Pigtailed Electrooptic Probe
In this paper we illustrate the ability of electro-optic sensors to perform electric (E)-field vectorial measurements. Thanks to their frequency response spreading over nine decades and to their measurement dynamics reaching 120 dB, these sensors are of high interest for some applications.
High-Power Electromagnetic (HPEM) measurements in free space, in near field or inside equipments require a wide frequency bandwidth without perturbation induced by the measurement transducer.
Pulsed power and intense electric field now apply to a large variety of domains for which the need of in situ nonperturbative measurements remains a challenge.
We have developed ultra compact and fully dielectric pigtailed optical sensors for a simultaneous 2-components electric-field measurement. Their measurement dynamic covers the V/m up to MV/m electric-field strength range.
Magnetic Resonance Imaging (MRI) is based on a spatial characterization of the nuclear magnetization. Recording the variation of the nuclear magnetization is often realized with a MRI external surface coil. However, spatial resolution and image quality achievable with external surface coils are limited.
Radio frequencies constitute a part of the electromagnetic (EM) spectrum extensively exploited for many domestic, industrial, and medical applications. Their massive use has led to new questions about the potential effects on health of this non-ionizing radiation.
In this paper, we present radio-frequency electromagnetic field characterization of an electrooptic (EO) probe. This probe is able to simultaneously measure temperature and one component of the electric field (e-field) in a continuous wave (CW) or in a pulsed regime.