Abstract: Transmission attenuation correction device for scintigraphic cameras that contain a source of gamma rays that sweep the active surface of a detector facing it through the body of the patient in order to measure the attenuation of the photon energy through this body and therefore allow for the correction of the attenuation of the photon energy emitted by the radiated organ. The radioactive source (30) is inserted in a rod (29) located in a removable cassette (21), this rod can automatically isolate the source (30) when the cassette (21) is not in its support. Each device is contained in a box attached to the detector other than the one facing it. The rod (29) that contains the source has different realization forms that make it possible to include materials that each have their own attenuation coefficient.

Abstract: An articulation system that allows for the rotation of a TAC device of a dual detector scintigraphy camera in two successive positions, perpendicular and opposite, in order to make it possible to use the TAC device either with perpendicular detectors or with parallel detectors. This articulation system contains a joint face at a 45° angle in relation to the longitudinal axis of a support so that the TAC device can take on two positions, perpendicular and opposite, where passage from one position to the other is obtained by a 180° rotation in relation to the axis of this joint face.

Abstract: A simultaneous acquisition process of a transmission image and an emission image with a gamma camera equipped with a detector (3), the detector (3) being opposite the patient (5) who has received an injection of a first radioactive isotope emitting gamma-ray photons (&ggr;2) in a first energy range (P1), the process including the movement of a radioactive source (4) behind the patient (5), the source (4) consisting of a second isotope emitting gamma-ray photons (&ggr;1) in a second energy range (P2), and the production, during the detection of an impact of a gamma-ray photon on the detector (3) of the coordinates of the impact of the photon on the detector and information relevant to the energy of the photon during the impact, the process having the particularity that it differentiates between the photon impacts according to their energy levels and the position of the impact in relation to the position of the source (4).

Abstract: A process for processing signals delivered by a gamma camera including two detectors (23, 26, 28, 24, 27 and 29) on either side of a radioactive body (25), each of the detectors (23, 26, 28, 24, 27 and 29) producing analogue electric signals (x.sup.+, x.sup.-, y.sup.+, y.sup.- and w) consisting of pulses relevant to the impacts of gamma-ray photons (.gamma.' and .gamma.") on the detectors (23 and 24), the coordinates of the impact points being calculated from compressed signals, and the detection of the impact being performed in parallel by coincidence.

Abstract: To reduce the costs of manufacture of a nuclear medicine machine, there is provided a machine whose detector is not mobile. In order, nevertheless, to give it extensive possibilities of adaptation, an input face of the detector is made in a concave curved shape. As a variant, with a mobility that is simple to achieve, it is even possible to take account of the differences in size among patients.

Abstract: A collimator intended to be mounted in a detector of a medical imaging system and having holes defined by a given cross section, height in inclination and vergence, as well as to a medical imaging system equipped with a collimator of this type. The holes are collected in at least a first and a second region, the holes in the first region being defined by a first cross section, a first height, a first inclination and a first vergence, the holes in the second region being defined by a second cross section, a second height, a second inclination and a second vergence, and wherein the first cross section is different than the second cross section and/or the first height is different than the second height and/or the first inclination is different than the second inclination and/or the first vergence is different than the second vergence. The invention applies, in particular, to gamma cameras.

Abstract: A gamma camera equipped with at least two radiation detectors inclined in relation to each other and a patient-carrier bed including a platform which includes a window that is more transparent to radiation than the rest of the platform. The platform includes two parts defining the window therebetween and connected to each other by a lateral arch.

Abstract: A method in nuclear medicine of obtaining a truncation-corrected image of a patient's body, according to which the patient's body is placed on a bed of a nuclear medicine machine including at least one detector head equipped with a detection surface of nuclear rays; a first truncated image in projection of the patient's body is acquired; a second image in projection of the patient's body at an angular position of the first truncated image in projection is acquired. An item of information from the second image is introduced in the first image (P1) with a view to correcting it in its truncated part. The invention applies, in particular, to tomographic examinations.