1544 results about "Radiation imaging" patented technology

Radioimaging methods, devices and radiopharmaceuticals therefor.

Disclosed is an X-ray imaging apparatus in which a correction function used to correct scattered X-rays and a correction function used to correct beam hardening can be simply and precisely determined so that the correcting operations are performed in an appropriate sequence using the correction functions thus determined to enhance the precision in the correction and improve the image quality. The scattered X-rays and the beam hardening are corrected sequentially in this order, using the scattered X-ray correction function and the beam hardening correction function, both calculated using measured data for calculating the correction functions. The scattered X-ray correction function approximates as to each transmission distance, the data measured with changes in the transmission distance and with changes in the scattered X-ray amount, and associates the correction value thus obtained with transmittance data. Upon calculation of the beam hardening correction function, data measured with changes in the transmission distance is converted into projection data and is linearly approximated to obtain an ideal amount of beam hardening.

Radioimaging methods, devices and radiopharmaceuticals therefor.

A radiation imaging apparatus in which early recognition of breast cancer can be made possible by acquiring both a radiation tomographic image that accurately displays a tumor mass and a radiation planar image that accurately displays calcification. The apparatus includes an image processing unit for generating a tomographic image signal in a first imaging mode and generating a planar image signal in a second imaging mode, a computing unit for computing an imaging direction for obtaining a radiation planar image based on a location designated in a radiation tomographic image, and a control unit for controlling a rotational driving device and a radiation generating unit to obtain the radiation tomographic image in the first imaging mode, and controlling the rotational driving device according to the computed imaging direction and controlling the radiation generating unit to obtain the radiation planar image in the second imaging mode.

Radioimaging methods, devices and radiopharmaceuticals therefor.

An imaging apparatus capable of reducing a line noise artifact in a simple configuration without complicated operations includes: a plurality of pixels arranged in row and column directions and having a photoelectric conversion element and a switch element; a plurality of signal wirings connected to the plurality of switch elements in the column direction; a read out circuit connected to the plurality of signal wirings; and a power source for supplying a voltage to the photoelectric conversion element. With the configuration, the plurality of pixels are classified into a plurality of groups, and the power sources are independently provided for each of the plurality of groups.

An X-ray imaging system includes first to third absorption gratings. Initially, the third absorption grating is disposed in a Z axis orthogonal to a detection surface of a FPD, and the position of the third absorption grating is adjusted in θx and θy directions based on a dose of X-rays having passed through the third absorption grating. Then, the first absorption grating is disposed in the Z axis so as to produce a moiré pattern. The position of the first absorption grating is adjusted in the θx and θy directions so that a frequency of the moiré pattern detected by the FPD becomes uniform. Then, the position of the first absorption grating is adjusted in a Z or θz direction so that the FPD loses the detection of the moiré pattern. After that, the second absorption grating is aligned in a like manner as the first absorption grating.

A lamp emits pulse-shaped visible light when a wait period begins. If a radiation emission switch is not pressed in the wait period, X-ray radiation is not emitted from an X-ray source, and no charges are accumulated in photoelectric conversion elements of an X-ray imaging apparatus. In a non-read period, although signals are sequentially read from the photoelectric conversion elements, an output signal does not change. When the radiation emission switch is pressed in synchronization with a radiation-induced signal in a certain wait period, the X-ray source emits X-rays. After irradiation of X-rays, a photoelectric conversion period transitions to an actual read period. In the photoelectric conversion period, X-rays are emitted and transmitted X-ray information of a patient are accumulated in the photoelectric conversion elements of the X-ray imaging apparatus. In the actual read period, the accumulated information is read.

A method of imaging, comprising:(a) providing an isotope at a low dosage in a body of a patient;(b) receiving radiation generated by said isotope from said body using a radiation camera; and(c) reconstructing a 3D distribution of said isotope from said received radiation,wherein the dosage is less than ⅓ of a standard dose set forth in Table 5.

When a gain correction is performed for the radiographed object image, the acquisition of the object image having a high grade quality and no artifact is realized. For that purpose, an image storing unit is provided for storing an image for correction radiographed based on conditions set with the table in a state in which no object exists to each operation modes of the plurality of operation modes; and an image processing unit is provided for performing a gain correction processing of the radiographed object image and performs the gain correction processing of the radiographed object image obtained based on the conditions set in the table of the operation mode selected by the selecting unit in a state in which the object exists using a corresponding image for correction extracted from the image storage unit based on the operation mode selected by the selecting unit.