Abstract: The present invention identifies ? decay and other events included in the emission of an LaBr3 scintillator and only collects ? ray events. An LaBr3 scintillation detector is provided with an LaBr3 scintillator 10, a photomultiplier tube 12, an oscilloscope 14, and a computer 18. The computer 18 detects a peak value Vp and a total charge amount Qtotal of a voltage waveform signal and calculates an error propagation expression function for a ratio of the peak value Vp to the total charge amount Qtotal. This error propagation expression function is used as a threshold function for identifying and removing ? decay events. The ? decay events are identified from the peak value Vp and total charge amount Qtotal, which are measurement values that can be measured in real time.

Abstract: A scintillation light detecting device distinguishes between signals from scintillator elements. The device includes a scintillator array. In the scintillator array, the scintillator elements have mutually different decay time constants for emitted light generated as a result of an incident radiation event. A photomultiplier tube that receives light output from the scintillator elements and converts the light into an electrical signal. In relation to the event, an arithmetic processing device detects a peak value and an integrated charge quantity in a voltage waveform of the electrical signal from the photomultiplier tube, and identifies the scintillator element in the scintillator array to which the electrical signal, resulting from the incidence of radiation onto the scintillator element, is attributable, in accordance with a ratio between the detected peak value and integrated electric charge quantity.

Abstract: Provided are a scintillator with improved energy sensitivity dependence within the energy range of diagnostic X-rays, more specifically in the range of 40-150 kV, and a radiation dosimeter using same. Due to the scintillator comprising a photopolymer resin that contains a polymerizable monomer, a filler, and a photopolymerization initiator, energy sensitivity dependence within the range of 40-150 kV is improved. Furthermore, changes in relative sensitivity within this energy range can be reduced to 3% or less by containing an inorganic fluorescent substance such as Zn2SiO4.

Abstract: An X-ray therapy system includes a gantry, a positron emission tomography (PET) detection device in the gantry, and an irradiation unit in the gantry (and configured to radiate X-rays to a patient. The PET detection device has a pair of photon detection units and photon detection unit-moving devices configured to move the pair of photon detection units with respect to the gantry.

Abstract: A scintillation light detecting device distinguishes between signals from scintillator elements. The device includes a scintillator array. In the scintillator array, the scintillator elements have mutually different decay time constants for emitted light generated as a result of an incident radiation event. A photomultiplier tube that receives light output from the scintillator elements and converts the light into an electrical signal. In relation to the event, an arithmetic processing device detects a peak value and an integrated charge quantity in a voltage waveform of the electrical signal from the photomultiplier tube, and identifies the scintillator element in the scintillator array to which the electrical signal, resulting from the incidence of radiation onto the scintillator element, is attributable, in accordance with a ratio between the detected peak value and integrated electric charge quantity.

Abstract: The present invention identifies ? decay and other events included in the emission of an LaBr3 scintillator and only collects ? ray events. An LaBr3 scintillation detector is provided with an LaBr3 scintillator 10, a photomultiplier tube 12, an oscilloscope 14, and a computer 18. The computer 18 detects a peak value Vp and a total charge amount Qtotal of a voltage waveform signal and calculates an error propagation expression function for a ratio of the peak value Vp to the total charge amount Qtotal. This error propagation expression function is used as a threshold function for identifying and removing ? decay events. The ? decay events are identified from the peak value Vp and total charge amount Qtotal, which are measurement values that can be measured in real time.

Abstract: Provided are a scintillator with improved energy sensitivity dependence within the energy range of diagnostic X-rays, more specifically in the range of 40-150 kV, and a radiation dosimeter using same. Due to the scintillator comprising a photopolymer resin that contains a polymerizable monomer, a filler, and a photopolymerization initiator, energy sensitivity dependence within the range of 40-150 kV is improved. Furthermore, changes in relative sensitivity within this energy range can be reduced to 3% or less by containing an inorganic fluorescent substance such as Zn2SiO4.

Abstract: An organism is irradiated with therapeutic radiation from a radiation irradiation device. A pair of two-dimensional radiation detectors are arranged so as to face one another with the irradiated therapeutic radiation passing therebetween, and detect the two-dimensional positions irradiated by a pair of annihilation ? rays produced when a positron emitted from a positron-emitting radionuclide is annihilated. On the basis of a pair of positions detected by the pair of two-dimensional radiation detectors, a radionuclide position detecting unit detects the position of the positron-emitting radionuclide, and the radiation irradiation device irradiates the position of the positron-emitting radionuclide with therapeutic radiation.

Abstract: In the case where X-ray tubes and X-ray detectors have fixed directions (directions of irradiation and directions of detecting planes), X-ray fluoroscopy can be carried out from various directions by providing two U-shaped tracks for the X-ray tubes and the X-ray detectors, each having two straight tracks arranged opposite each other, and a curved track connected thereto. An increased number of directions for X-ray fluoroscopy can be secured by arranging a U-shaped track rail for the X-ray tubes and a U-shaped track rail for the X-ray detectors opposite each other when seen in plane view.

Abstract: The X-ray therapy system includes a gantry (11), a positron emission tomography (PET) detection device (12) provided in the gantry (11), and an irradiation unit (15) provided in the gantry (11) and configured to radiate X-rays to a patient. The PET detection device (12) has a pair of photon detection units (13) and photon detection unit-moving devices (14) configured to move the pair of photon detection units (13) with respect to the gantry (11).

Abstract: A target tracking device for tracking a moving target, based on X-ray fluoroscopic images from a plurality of directions, the target tracking device may include a plurality of X-ray fluoroscopic devices, an image processing unit, and a position determining unit. The X-ray fluoroscopic devices obtain a plurality of images from a plurality of directions, each of the images in a given direction having a different sensitivity. The image processing unit identifies a position of a target image based on pattern matching between the plurality of images and an image of the target. The position determining unit determines a 3D position of the target based on the position of the target image in the plurality of images from the plurality of directions.

Abstract: A target tracking device for tracking a moving target, based on X-ray fluoroscopic images from a plurality of directions, the target tracking device may include a plurality of X-ray fluoroscopic devices, an image processing unit, and a position determining unit. The X-ray fluoroscopic devices obtain a plurality of images from a plurality of directions, each of the images in a given direction having a different sensitivity. The image processing unit identifies a position of a target image based on pattern matching between the plurality of images and an image of the target. The position determining unit determines a 3D position of the target based on the position of the target image in the plurality of images from the plurality of directions.

Abstract: In the case where X-ray tubes and X-ray detectors have fixed directions (directions of irradiation and directions of detecting planes), X-ray fluoroscopy can be carried out from various directions by providing two U-shaped tracks for the X-ray tubes and the X-ray detectors, each having two straight tracks arranged opposite each other, and a curved track connected thereto. An increased number of directions for X-ray fluoroscopy can be secured by arranging a U-shaped track rail for the X-ray tubes and a U-shaped track rail for the X-ray detectors opposite each other when seen in plane view.

Abstract: An X-ray fluoroscopic unit simultaneously acquires a plurality of X-ray fluoroscopic images with different sensitivities in one direction. An image processing unit detects a target on the basis of the plurality of X-ray fluoroscopic images acquired in each direction.

Abstract: An organism is irradiated with therapeutic radiation from a radiation irradiation device. A pair of two-dimensional radiation detectors are arranged so as to face one another with the irradiated therapeutic radiation passing therebetween, and detect the two-dimensional positions irradiated by a pair of annihilation ? rays produced when a positron emitted from a positron-emitting radionuclide is annihilated. On the basis of a pair of positions detected by the pair of two-dimensional radiation detectors, a radionuclide position detecting unit detects the position of the positron-emitting radionuclide, and the radiation irradiation device irradiates the position of the positron-emitting radionuclide with therapeutic radiation.

Abstract: Light emitted in correspondence to ionizing radiation incident from a scintillator is fed through an optical fiber to a photoelectron multiplier tube by which it is converted to an electrical signal. The electrical signal is amplified by a signal amplifying circuit, and any light emission events of given or higher intensity are discriminated by a discriminator and counted by a counter. The count value is fed to a computer. The computer converts the count value to a dosage on the basis of an exponential relationship lying between the light emission intensity and the number of emission events, thereby attaining detection of the dosage.

Abstract: Light emitted in correspondence to ionizing radiation incident from a scintillator is fed through an optical fiber to a photoelectron multiplier tube by which it is converted to an electrical signal. The electrical signal is amplified by a signal amplifying circuit, and any light emission events of given or higher intensity are discriminated by a discriminator and counted by a counter. The count value is fed to a computer. The computer converts the count value to a dosage on the basis of an exponential relationship lying between the light emission intensity and the number of emission events, thereby attaining detection of the dosage.