Abstract: It is an object of one of the inventions to acquire a radiation image in which a stripe pattern originating from a scattered ray removing grid is less apt to interfere with observation. An image acquisition apparatus of one of the inventions includes a sensor for spatially sampling a radiation transmission distribution of an object to be imaged at a spatial sampling interval and acquiring an image of the object, and a scattered ray removing grid for removing scattered rays from the object, wherein an interval of elements of the scattered ray removing grid is set such that a spatial frequency of a stripe pattern, in the image, which originates from the scattered ray removing grid becomes not greater than 40% of a sampling frequency that is a reciprocal of the spatial sampling interval.

Abstract: An X-ray scatter reduction grid includes a first layer having a plurality of cell. The cells have a perimeter formed of an X-ray absorbing material. The shape of the perimeters can vary, but a polygonal shape is preferred. The grid can also include other layers, each with their own cells. The cells of the subsequent other layers are larger than and offset from the cells of the prior layer. The increased size of the cells allows a primary ray passing through the center of a first layer cell to also pass through the center of a subsequent layer cell. This allows for a maximum of primary ray passthrough and a maximum of scatter absorption.

Abstract: A method to produce a grid structure by means of an extrusion process. In order to extrude a layered structure exhibiting a high aspect ration a multiplication die is used. Such a method is also suited to manufacture X-ray scatter grids, comprising X-ray absorbing (10) and X-ray transmitting (9) regions, said X-ray scatter grid (6) to be used in an X-ray examination apparatus.

Abstract: Multiple objects having the same physical property within a subject are displayed as distinct three-dimensional images in one or more views. Projection data obtained by scanning the subject with electromagnetic radiation are used to create a spatial distribution of absorption values for the subject that is displayed as an image on an image display unit. The spatial distribution is also stored as a series of voxels representing a three-dimensional image of the subject. Particular spatial regions within the image are defined as objects, with each object comprising a set of voxels. The objects are grouped into one or more views using a set selection panel on the image display unit. A density, gradient and color for each object in a view are determined based on properties input through the a series of object property setting panels on the image display unit. Each object in a particular view is associated with one of the property setting panels.

Abstract: An anti-scatter grid for radiography includes a plurality of generally radiation absorbing elements and a plurality of generally non-radiation absorbing elements in which the generally non-radiation absorbing elements include a plurality of voids. Desirably, the non-radiation absorbing elements include an epoxy or polymeric material and a plurality of hollow microspheres. Disclosed is also an apparatus for forming an anti-scatter grid in which the apparatus includes a pivoting arm and surface for use in aligning a plurality of spaced-apart generally radiation absorbing elements relative to a radiation source.

Abstract: An X-ray tube and an X-ray detector are supported by an arm in such a manner that a distance between the X-ray tube and an image reception plane of the X-ray detector can be changed. A grid is arranged on the image reception plane of the X-ray detector. The arm is supported by an arm support apparatus in such a manner that an angle of the arm can be changed. Moire image data files obtained by the grid are stored in a storage device in association with the distance between the X-ray tube and the image reception plane of the X-ray detector and the angle of the arm. Image data outputted from the X-ray detector is corrected by the moire correction circuit based on the moire image data selectively read from the storage device in accordance with the distance and the angle.

Abstract: An injection molded anti-scatter grid is fabricated from an engineered thermoplastic to form a focused x-ray absorbent framework defining a plurality of inter-spaces. The engineered thermoplastic has higher yield strength than conventional anti-scatter grid fabrication materials, which produces a structurally rigid grid that renders conventional fiber-like inter-space material unnecessary, and further allows the grid to be flexed in one or more directions to change an effective focal length of the grid. The engineered thermoplastic is loaded with high density particles in order to be x-ray absorbent, while still maintaining desired structural properties.

Abstract: A method is provided for fabricating precision x-ray collimators including precision focusing x-ray collimators. Fabricating precision x-ray collimators includes the steps of using a substrate that is electrically conductive or coating a substrate with a layer of electrically conductive material, such as a metal. Then the substrate is coated with layer of x-ray resist. An intense radiation source, such as a synchrotron radiation source, is utilized for exposing the layer of x-ray resist with a pattern of x-ray. The pattern delineates a grid of apertures to collimate the x-rays. Exposed parts of the x-ray resist are removed. Regions of the removed x-ray resist are electroplated. Then remaining resist is optionally removed from the substrate. When exposing the layer of x-ray resist with a pattern of x-ray for non-focusing collimators, the substrate is maintained perpendicular to impinging x-rays from the synchrotron radiation source; and the substrate is scanned vertically.

Abstract: An X-ray tube and an X-ray detector are supported by an arm in such a manner that a distance between the X-ray tube and an image reception plane of the X-ray detector can be changed. A grid is arranged on the image reception plane of the X-ray detector. The arm is supported by an arm support apparatus in such a manner that an angle of the arm can be changed. Moire image data files obtained by the grid are stored in a storage device in association with the distance between the X-ray tube and the image reception plane of the X-ray detector and the angle of the arm. Image data outputted from the X-ray detector is corrected by the moire correction circuit based on the moire image data selectively read from the storage device in accordance with the distance and the angle.

Abstract: An X-ray image photographing apparatus includes an image obtaining portion for obtaining an X-ray distribution transmitted through an object, a grid detecting system having a construction for obtaining information from a grid side by the action of inserting the grid for decreasing scattered rays into the apparatus, and detecting at least one of the presence or absence of the grid, the kind of the grid and the presence or absence of the replacement of the grid by the use of the construction, an image processing system for image processing and outputting image data collected by the image obtaining portion, and a memory portion preserving therein a plurality of sets of image processing parameters for controlling the image processing system. The image processing system selects the image processing parameters preserved in the memory on the basis of at least the result of the detection by the grid detecting system and executes image processing.

Abstract: Method and apparatus and computer programs and computer medium for improving quality of a radiographic image of an object obtained by an X-ray apparatus containing an antidiffusion grid, placed between the object and a receiver of radiographic images, The grid is displaced in rectilinear translation in its plane on pickup of the image, between two positions according to a time displacement law which is a continuous curve with a time precision of approximately ±10% presenting at least five separate parts, the displacement taking place at constant speed over at least two parts and at variable speed over at least one part.

Abstract: Fourier telescopes permit observations over a very broad band of energy. They generally include synthetic spatial filtering structures, known as multilayer grids or grid pairs consisting of alternate layers of absorbing and transparent materials depending on whether neutrons or photons are being imaged. For hard x-rays and gamma rays, high (absorbing) and low (transparent) atomic number elements, termed high-Z and low-Z materials may be used. Fabrication of these multilayer grid structures is not without its difficulties. Herein the alternate layers of the high-Z material and the low-Z material are inserted in a polyhedron, transparent to photons of interest, through an open face of the polyhedron. The inserted layers are then uniformly compressed to form a multilayer grid.

Abstract: An anti-scatter grid for radiography includes a plurality of generally radiation absorbing elements and a plurality of generally non-radiation absorbing elements in which the generally non-radiation absorbing elements include a plurality of voids. Desirably, the non-radiation absorbing elements include an epoxy or polymeric material and a plurality of hollow microspheres. Disclosed is also an apparatus for forming an anti-scatter grid in which the apparatus includes a pivoting arm and surface for use in aligning a plurality of spaced-apart generally radiation absorbing elements relative to a radiation source.

Abstract: A radiation photographing apparatus has a radiation image receiving portion for receiving radiation transmitted through an object and obtaining a radiation transmission image, and a grid to be disposed on the object side of the radiation image receiving portion. The grid includes a scattered ray removing member or a radiation detector. The grid is constructed for movement also to the side opposite to the object side of the radiation image receiving portion.

Abstract: A radiographic apparatus is disclosed which controls a movement of a reciprocatingly moving grid so that the grid is not or less likely returned in the middle of exposure of an object to X rays. The probability that the object is still exposed to the X rays when the grid is moved in the vicinity of a turning point is thus substantially lowered. Therefore the probability that a resulting radiograph has no or less moire pattern due to the grid is substantially heightened.

Abstract: A shielding grid constructed of a radiation absorbing material for use with an array of discreet, non contiguous radiation sensors to protect such sensors from scattered radiation. The sensors each have a radiation sensitive area with a width and a length. In designing the grid a prototile having a prototile width and a prototile length is developed. The prototile width is equal to the radiation sensitive area width divided by an integer and the prototile length is also equal to the radiation sensitive area length divided by an integer. The prototile contains a pinwheel motif of radiation absorbing material contained solely within the prototile that forms a pattern when a plurality of prototiles sufficient to cover the array of discreet sensor are arrayed contiguously. The grid is constructed with the radiation absorbing material in this pattern.

Abstract: One embodiment of the present invention is a method for constructing a post-patient collimator for a computed tomographic (CT) imaging system, the method including steps of: edge welding collimator plates to a top rail using at least one directed energy beam welder; and edge welding the collimator plates to a bottom rail, using the at least one directed energy beam welder. The above described embodiment provides an efficient and less expensive method for manufacturing a post-patient collimator for a CT imaging system than embodiments requiring use of precision combs for accurately positioning the plates.

Abstract: In a digital x-ray imager alignment method, a low exposure x-ray image of an object is taken. The dose is sufficient to create an image of an object and alignment bars on an antiscatter grid. The relative position of the alignment bars on the image is measured. The relative angle of the detector to the x-ray source is adjusted. This adjustment brings the grid into alignment with the x-ray source. A diagnostic x-ray exposure image of the object is then taken.

Abstract: A bucky device and method including an X-ray image detector, an anti-scatter grid, a first chamber disposed to house the grid in an active position in which the grid is positioned upstream of the X-ray image detector in respect to x-ray impingement and a second chamber disposed to house the grid in a storage position in which the grid is positioned downstream of the X-ray image detector in respect to x-ray impingement.

Abstract: A scattered ray absorption grid enhancing a scattered ray absorption property without increasing costs is provided. A grid portion of the scattered ray absorption grid is constituted by use of plate members obtained in such a manner that a powder containing tungsten 50% by weight or more is hardened with a binder so that the powder has a spatial filling rate of 40% or more.

Abstract: In a digital x-ray imager alignment method, a low exposure x-ray image of an object is taken. The dose is sufficient to create an image of an object and alignment bars on an antiscatter grid. The relative position of the alignment bars on the image is measured. The relative angle of the detector to the x-ray source is adjusted. This adjustment brings the grid into alignment with the x-ray source. A diagnostic x-ray exposure image of the object is then taken.

Abstract: Image contrast grids include a body having openings and an x-ray absorbing material in the openings. The openings can be formed by various micromachining techniques and the x-ray absorbing material can be formed in the openings by various coating and deposition techniques. The image contrast grids can have contoured surfaces for improved focusing capabilities. The image contrast grids can remove Compton scattered x-rays in two, non-normal dimensions. The openings can be formed with fine structures that are not visible in most imaging modes.

Abstract: The invention concerns an illumination system for wavelengths (193 nm, particularly for EUV lithography with at least one light source, which has an illumination A in one surface; at least one device for producing secondary light sources; at least one mirror or lens device, comprising at least one mirror or one lens, which is (are) divided into raster elements; one or more optical elements, which are arranged between the mirror or lens device that comprises at least one mirror or one lens, which is (are) divided into raster elements, and the reticle plane, wherein the optical elements image the secondary light sources in the exit pupil of the illumination system.

Abstract: A method and system for providing a portal image of an object utilizing a radiotheraphy system is disclosed. The radiotherapy system includes a system for providing at least one opening over the object. The at least one opening allows radiation therethrough. The method and system comprises acquiring a plurality of images through the at least one opening while moving the at least one opening over the object. Each of the plurality of images includes regions within the opening and regions outside the opening. The method and system includes obtaining a resulting portal image from the plurality of images. Radiation scattered to regions outside the opening is minimized in the resulting portal image to improve image quality. A method and system in accordance with the present invention utilizes a virtual grid to provide a resulting portal image with more contrast. The virtual grid is provided through an opening or a slit. The slit is preferably provided by a plate/jaw system in the radiotherapy system.

Abstract: A collimator 100 for use in a radiation imaging system 10, and a method for making such collimators, are provided, wherein the collimator 100 is capable of collimating radiation in two orthogonal planes. The collimator in one embodiment includes a block 101 of radiation absorbing material having a plurality of focally aligned channels 102 extending therethrough; in a second embodiment, the collimator includes first and second collimation 204, 212 sections having a respective first plurality of focally aligned plate sets 201 and a respective second plurality of focally aligned plate sets 203 disposed orthogonally to the first plurality of plate sets. The method for making the collimator includes generating a CAD drawing, generating from the CAD drawing one or more stereo-lithographic files, and using the stereo-lithographic files to control an electro-deposition machining machine which creates the channels in the block.

Abstract: A shielding grid constructed of a radiation absorbing material for use with an array of discreet, non contiguous radiation sensors to protect such sensors from scattered radiation. The sensors each have a radiation sensitive area with a width and a length. In designing the grid a prototile having a prototile width and a prototile length is developed. The prototile width is equal to the radiation sensitive area width divided by an integer and the prototile length is also equal to the radiation sensitive area length divided by a integer. The prototile contains a motif contained solely within the prototile that forms a pattern when a plurality of prototiles sufficient to cover the array of discreet sensor are arrayed contiguously. The grid is constructed with the radiation absorbing material in this pattern.

Abstract: A detection head and collimator for a gamma camera. The detection head includes several elementary detectors with semiconductors adjacent to each other to form a detection plane. The collimator is placed in front of the detection plane and includes a number of ducts laid out in a repetition pattern. The shape of the elementary detectors and the repetition pattern are rectangular in the detection plane.

Abstract: A grid, for use with electromagnetic energy emitting devices, includes at least metal layer, which is formed, for example, by electroplating. The metal layer includes top and bottom surfaces, and a plurality of solid integrated walls. Each of the solid integrated walls extends from the top to bottom surface and having a plurality of side surfaces. The side surfaces of the solid integrated walls are arranged to define a plurality of openings extending entirely through the layer. At least some of the walls also can include projections extending into the respective openings formed by the walls. The projections can be of various shapes and sizes, and are arranged so that a total amount of wall material intersected by a line propagating in a direction along an edge of the grid is substantially the same as another total amount of wall material intersected by another line propagating in another direction substantially parallel to the edge of the grid at any distance from the edge.

Abstract: A scattered ray absorption grid enhancing a scattered ray absorption property without increasing costs is provided. A grid portion of the scattered ray absorption grid is constituted by use of plate members obtained in such a manner that a powder containing tungsten 50% by weight or more is hardened with a binder so that the powder has a spatial filling rate of 40% or more.

Abstract: In order to increase the ruggedness and the scattered radiation attenuation quality, a grid (3) with comb elements (12) which absorb electromagnetic radiation and are intended to form a grid is constructed, in such a manner that comb lamellae (11) extend transversely of an associated comb base surface which supports the comb lamellae (11).

Abstract: The present invention relates to an arrangement for detecting X-ray radiations comprising a carrying member on one face arranged with detectors consisting of a plurality of sensors arranged on a substrate. The detectors are arranged substantially edge to edge at lease in one row on at least one side of said carrying member.

Abstract: An X-ray image photographing apparatus includes an image obtaining portion for obtaining an X-ray distribution transmitted through an object, a grid detecting system having a construction for obtaining information from a grid side by the action of inserting the grid for decreasing scattered rays into the apparatus, and detecting at least one of the presence or absence of the grid, the kind of the grid and the presence or absence of the replacement of the grid by the use of the construction, an image processing system for image processing and outputting image data collected by the image obtaining portion, and a memory portion preserving therein a plurality of sets of image processing parameters for controlling the image processing system. The image processing system selects the image processing parameters preserved in the memory on the basis of at least the result of the detection by the grid detecting system and executes image processing.

Abstract: In an X-ray image detector including an X-ray grid unit for transmitting primary X-rays and removing scattered X-rays, a fluorescent substance for emitting fluorescence through excitation by X-rays, and photoelectric conversion elements for photoelectrically converting the fluorescence, these X-ray grid unit, fluorescent substance and photoelectric conversion elements are constituted together as a single unit. The plurality of photoelectric conversion elements are arranged two-dimensionally between each adjacent two of which there is a predetermined insensitive region. The X-ray grid is composed of a plurality of X-ray absorption members for removing the scattered X-rays, and the X-ray absorption members are disposed substantially only on the predetermined insensitive regions when viewed from a direction from which X-rays are incident.

Abstract: The object of this invention is to provide an imaging apparatus capable of providing a high-quality image optimum for medical diagnosis or the like by an arrangement for preventing any degradation in image quality due to the influence of electromagnetic noise and vibration caused by grid movement. In order to achieve this object, as operation control in receiving radiation transmitted through an object by an image sensing element through a movable grid and reading the accumulated signal from the image sensing element, a control device stops moving drive of the grid after the end of radiation irradiation for the object, and after the stop of moving drive, starts reading the accumulated signal from the image sensing element.

Abstract: When X-rays are projected to an X-ray sensor through a grid, a pitch of the grid has a relationship such that a length of multiplying an odd number to a half pitch of a projection image is equal to a pitch of detection pixels of the X-ray sensor. X-rays passing through a sample to be measured via the grid are detected by the X-ray sensor. Levels of the detected X-ray detection signals are inputted into an operation process portion and subjected to an equalizing process for every even number detection pixel group continuously lined up in a pitch direction of the grid, i.e. with a combination of a high value and a low value of the levels of the X-ray detection signals, as a unit. As a result, irregularities of the levels of the X-ray detection signals can be corrected, and moires generated on an output screen of an image display portion can be removed.

Abstract: A radiation image obtaining apparatus having an anti-scatter grid effectively eliminates an effect of scattered beams even in cases where the radiation image is taken using a radiation beam generated with a relatively high peak voltage. A source of the radiation beam generates the radiation beam with a peak voltage as high as 50-150 kvp, which generally induces the scattered beams of high intensities. The anti-scatter grid is an air-grid or a foamed material grid exhibiting direct beam transmittance of 70% or more for the generated radiation beam. An image signal representing a radiation image of a high S/N ratio containing only little noise due to the scattered beams can be obtained even with such a high peak voltage, as the transmittance of the radiation beam can be maintained at a high level while the effect of the scattered beam is eliminated.

Abstract: A scattered-ray grid, particularly for medical radiography systems having an X-ray source which emits an X-ray beam with a center ray is formed by a carrier with absorbent elements, namely in the form of lead elements that are realized as separated pins in spaced rows. The rows of pins are oriented such that they proceed toward the intersection of the center ray and the scattered-ray grid.

Abstract: A scattered-ray grid has a carrier with absorption elements arranged thereon in spaced rows which proceed essentially spoke-like relative to a grid center. Except for one or more rows which originate at the grid center, the individual rows of the scattered-ray grid, or of substantially identical grid sectors of the scattered-ray grid each originate from respectively different radii. The origin of each row is situated in an angle section, which is determined on the basis of at least two points lying on a circle, or an arc of circle, with a predetermined radius and which is divided in a predefined ratio for determining the position of the origin. The predetermined radius is incremented in a stepwise manner to define respective origins for all of the rows.

Abstract: Disclosed is a tomographic apparatus (100; 200; 300) wherein a camera (10) is provided with a converging collimator (120; 220; 320), and wherein a planar radiation beam makes a scanning movement to move an elongate illumination pattern (125; 225; 325) over the camera (10). In a first embodiment the collimator (120) is a fan beam collimator, and the radiation source (150) is a line-shaped radiation source which is rotatable about its longitudinal axis. In a second embodiment the collimator (220) is a fan beam collimator, and the radiation source (250) is a point-shaped radiation source which is movable along the convergence line (221) of the collimator (220). In a third embodiment the collimator (320) is a cone beam collimator, and the radiation source (350) is a point-shaped radiation source which is rotatable about an axis of rotation (357) which intersects the convergence point (321) of the collimator (320).

Abstract: It is an object of this invention to provide an image acquisition apparatus which can acquire an image which prevents a stripe pattern originating from a scattered ray removing grid from interfering with observation when X-rays are radiated by using the scattered ray removing grid. An image acquisition apparatus of the invention radiates X-rays by using a scattered ray removing grid (11) and two-dimensionally samples an X-ray transmission distribution on an object (2) to be imaged at desired sampling intervals. This apparatus includes an image acquisition means for acquiring an image by setting the intervals of elements of the scattered ray removing grid, without moving the scattered ray removing grid, such that the spatial frequency of a stripe pattern, in the image, which originates from the scattered ray removing grid becomes 40% or more of a sampling frequency that is the reciprocal of the sampling intervals.

Abstract: An apparatus and method for obtaining a high-resolution digital image of an object or objects irradiated with radiation having a wavelength in the x-ray or gamma ray spectrum generated by a radiation source, or of an object or objects emitting radiation within the x-ray or gamma ray spectrum. The apparatus comprises a detector matrix and a radiation mask. The detector matrix comprises a plurality of detector pixels, each comprising a detection surface having a respective surface area which generates a signal in response to an energy stimulus. The radiation mask has an opaque portion, and a plurality of apertures. The aperture size and position relative to the detector array determines the image resolution not the size of the detector pixels.

Abstract: A grid, for use with electromagnetic energy emitting devices, includes at least metal layer, which is formed by electroplating. The metal layer includes top and bottom surfaces, and a plurality of solid integrated walls. Each of the solid integrated walls extends from the top to bottom surface and having a plurality of side surfaces. The side surfaces of the solid integrated walls are arranged to define a plurality of openings extending entirely through the layer. All of the walls can extend at 90° with respect to the top and bottom surfaces, or alternatively, some of the walls can extend at an angle other than 90° with respect to the top and bottom surfaces, such that the directions in which the walls extend all converge at a point in space at a predetermined distance from the front surface of the at least one layer. At least some of the walls also can include projections extending into the respective openings formed by the walls.

Abstract: A method, computer program product, and digital radiography system (100) detect type information concerning an anti-scatter grid (107), and store the information in a header (129) of a file (127) containing a digital x-ray image. A gleaning module (101) gleans relevant information from an identifier (103) on a physical medium (105) containing the anti-scatter grid (107). A retrieval module (121) retrieves an entry (123) corresponding to information gleaned from the identifier (103) and containing information concerning the anti-scatter grid (107) from a look-up table (119) in a computer memory (115). A storage module (131) stores the information in a header (129) of a file (127) containing the digital x-ray image. Additionally, a comparison module (401) compares type information concerning the identified anti-scatter grid (107) with type information for a correct anti-scatter grid for a procedure being performed.

Abstract: A radiation source, which produces radiation, is located on one side of an object, two-dimensional image read-out device is located on the other side of the object, the two-dimensional image read-out device comprising stripe-shaped electrodes for reading latent image charges, which carry image information, and an operation for recording and reading out a radiation image of the object is performed. A grid plate is located between the object and the two-dimensional image read-out device, the grid plate guiding only the radiation, which comes from a specific direction, to the two-dimensional image read-out device. The operation for recording and reading out the radiation image of the object is performed in this state, and deterioration in image quality due to scattered radiation is prevented.

Abstract: A stereo radiograph is produced in a radiography system including an anti-scatter grid (105) and sensor material (107). At least one x-ray beam (102) is emitted towards a body to be radiographed (103). The anti-scatter grid (105) is focused so as to transmit two distinct x-ray beams (106) to the sensor material (107). The transmitted beams (106) create two alternating images on the sensor material (107). A stereo radiograph is created from the two alternating images. System geometry of the radiography system is used to determine location of an object (606) within a radiographed body (103), and to determine distance (613) between a chosen point and an object (606) within a radiographed body (103).

Abstract: A grid enclosure for an X-ray cassette has a rugged construction, and is easy to us efficient in operation, with open corners therein to achieve the desired protection of an X-ray cassette.

Abstract: An integrated, self-aligning x-ray detector assembly for a computed x-ray tomography system includes an alignment grid for aligning an array of scintillator crystals with a corresponding array of photodiodes. The grid includes extensions which engage with a plurality of anti-scatter plates so that the anti-scatter plates and the scintillator crystals are in a predetermined alignment.

Abstract: A radiation anti-scatter device comprising a grid and a grid driver connected to the grid for unidirectionaly moving the grid with a variable grid velocity along a path between a starting and an end position, and a method of providing such grid motion. The variable grid velocity may have a velocity profile V1=k1t for a first period and then V2=k2t−m for a second period, where V1 and V2 are velocity, k1 and k2 are constants, t is time, and m is an exponent having a value greater than 0. The anti-scatter device may be a component of a direct radiographic diagnostic imaging system which includes an image-producing element having an array of radiation detectors aligned in rows, and where the anti-scatter device is a grid having vanes oriented at an angle to the detector rows. Radiation emission may be synchronized with the grid motion to optimize a radiograph for a particular grid, radiation source, or examination procedure.

Abstract: A collimator 100 for use in a radiation imaging system 10, and a method for making such collimators, are provided, wherein the collimator 100 is capable of collimating radiation in two orthogonal planes. The collimator in one embodiment includes a block 101 of radiation absorbing material having a plurality of focally aligned channels 102 extending therethrough; in a second embodiment, the collimator includes first and second collimation204, 212 sections having a respective first plurality of focally aligned plate sets 201 and a respective second plurality of focally aligned plate sets 203 disposed orthogonally to the first plurality of plate sets. The method for making the collimator includes generating a CAD drawing, generating from the CAD drawing one or more stereo-lithographic files, and using the stereo-lithographic files to control an electro-deposition machining machine which creates the channels in the block.

Abstract: By providing a movable grid for eliminating the scattered component of radiation entering a radiation image pickup unit and a controller for controlling the moving speed of the movable grid corresponding to variation of the intensity of the radiation, the grid can be controlled based on a predetermined radiation irradiating time.