Process for locating a positron radionuclide, applications and device for implementing same

摘要

The present disclosure relates to a method for locating a radionuclide emitting positons and having a child core emitting a photon by de-excitation, that includes detecting a radionuclide response line using a positon-emitting tomography camera. According to the disclosure, for each of the arrangements ordered by pairs of first and second interactions of the Compton type detected by a Compton telescope, the method comprises determining the angle between the direction of the incident photon of the first interaction and the geometrical axis connecting the position of the first interaction with the position of the second interaction, determining the half-aperture cones of the angle in which the geometrical surface does not include an intersection with line, selecting at least one cone in which the geometrical surface includes an intersection with line, selecting the radionuclide position from said reconstructed intersection of the response line with the geometrical surface of the selected cone.

主权项

1. A process for locating the position of a radionuclide emitting positrons emitting second and third photons having opposed direction along a response line and whereof a child core emits at least one first photon other than the response line by de-excitation, the process comprising
detecting a response line of the second and third photons by a camera with tomography by positron emission, using a Compton telescope for detecting a plurality, greater than or equal to two, of interactions of Compton type caused in cascade in a detection medium of the Compton telescope from the first photon, which is emitted by de-excitation child core of the radionuclide and is other than the response line, measuring the position of each interaction of the plurality by the Compton telescope, for each of the multiplicity of the arrangements ordered per pair of first and second interactions of Compton type among the plurality of detected interactions, determining the angle between the direction of the incident photon of the first interaction and the geometric axis which joins the position of the first interaction and the position of the second interaction by the Compton telescope and reconstructing the geometric surface of the cone having for apex the position of the first interaction and for semi-opening the angle determined around the geometric axis, wherein the geometric axis forms the axis of revolution of the cone and is oriented in the direction going from the second interaction to the first interaction, eliminating those cones where the geometric surface has no intersection with the response line, selecting at least one cone where the geometric surface is secant by a point of intersection with the response line which has been detected by the camera with tomography by positron emission and is not included in the geometric surface of the cone; and selecting the position of the radionuclide from the point of intersection of the response line secant with the geometric surface of the selected cone.