Other

Beyrard, Norbert

Norbert Beyrard

Frank Claeyssen

Ronan Le Letty

Francois Barillot

Franck Hereson

An X-ray or infrared imagery apparatus that performs a large sweep while reducing the irradiation or illumination dose. It comprises a support, an X-ray or light ray source that emits a beam through a slit of a dose limiter which is driven in translation, a detector irradiated or illuminated by the beam in order to detect an intensity attenuated along the X-ray or light ray propagation path through the body, an analog-to-digital converter to convert the detected intensities into data in order to determine an attenuation of the X-rays or light rays by the body, and a programmed computer to process the data in order to obtain an image representing the attenuation of the X-rays or light rays. The dose limiter either is driven in translation at a speed proportional to the detector or driven in translation at the same speed than the detector in front of a reflector.

X-ray or infrared imaging device comprising a dose limiter, with controlled translation speed

X-ray imaging method, in which the data (c, &#x3c1;) are processed by a programmed computer using the following formula: to calculate a value (C) of the attenuation coefficient at a point (P) of a set of points {P}, for a given pair of said angular positions &#x3b8;and &#x3b8;, in order to obtain an image representing an X-ray attenuation coefficient for said set of points {P} of the body (). According to the invention, the computer is programmed to perform the following stages:

X-ray imaging method and device with three-dimensional processing

Method and apparatus for X-ray imaging of a body, employing a support to receive a body to be examined, a source emitting a beam of X-rays, a detector irradiated by the beam, a converter for converting the detected intensities into data, a means for turning the mounted mobile support by an angle of rotation about an axis of rotation with respect to the source and the detector and a suitably programmed computer to average the data acquired for a pair of orthogonal angles of rotation to obtain n column and m line mean values for n and m elementary segments of a band of the detector, to construct an initial image (n, m) with the n column and m line mean values, to adjust the coefficient of attenuation in each n&#xd7;m elementary zone by a method of least squares taking into account the n column and m line mean values regarded as constraints, to repeat the previous stages for data acquired with different pairs of preferably orthogonal angles of rotation, and to average term by term the adjusted images so as to arrive at a synthesis image expressing coefficients of attenuation of the examined body.

Method for reducing exposure to infrared light beam, ultrasound or magnetic impulse rays in medical imaging devices

The inventive circuit breaker-contactor () comprises a fixed contact, a contact () movable () with respect to the fixed contact between open and closed positions, means () for displacing the movable contact () in the closed position thereof, means () for displacing the movable contact in the open position. According to said invention, said circuit breaker-contactor comprises means () for locking the movable contact () in the closed position thereof, a piezo-electric actuator () deformable from a rest position to an operating position for displacing the locking means () in such a way that the movable contact () is enabled to be displaced to the open position by the means () for displacing to the open position and an electronic power supply and control unit () for feeding and controlling the piezo-electric actuator () deformation in the operating position for displacing the locking means () in such a way that the movable contact () is unlocked in response to an electric current detected by the fixed contact ().

Circuit breaker-contactor with a piezo-electric controlled locking

Method and apparatus for X-ray or infrared imaging

A device for determining a refractive index (Rl) in a large number of points of a physical medium, comprising: a light laser for performing a series of p pulsed laser rays (PLRs) each proceeding from a starting point Ap and arriving in an arrival point Bp following the shortest optical path between the two points Ap and Bp; a timer to record a time Tp when each PLR reaches the arrival point Bp; and a computer programmed for finding the shortest optical path among all the optical paths starting from the starting point Ap and all reaching the arrival point Bp, and from p linear equations linking elementary optical paths (L) and the refraction indices (N) to the detected travel time Tp, for solving the matrix equation [N]*[L]=[T] relative to a vector of the refractive indices [N] and repeating until [L] and [N] converge.

Growing community of inventors

Divonne Les Bains, France

Norbert Beyrard