Matches 101 - 150 out of 173 < 1 2 3 4 >


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6792067 Method of correcting the extrafocal radiation of an X-ray tube in computed tomography  
A method of correcting the extrafocal radiation of an X-ray tube in image recordings with a computed tomograph, includes subjecting measured data, obtained from detector channels of at least one...
6687326 Method of and system for correcting scatter in a computed tomography scanner  
A system for correcting for scatter in a computed tomography scanner includes a tunnel having a platform disposed therein for receiving an object to be scanned, an x-ray source for directing...
6639964 Device and method for forming a computed X-ray tomogram with scatter correction  
The invention relates to a method for scatter correction while forming a computed X-ray tomogram. The distribution of the scattered radiation is determined by detector cells (7′) which, because of...
6618466 Apparatus and method for x-ray scatter reduction and correction for fan beam CT and cone beam volume CT  
In cone-beam volume computed tomography or similar imaging techniques, the effects of x-ray scatter are reduced through using a beam compensation filter (a bow tie filter), air gap technique, and...
6594338 Method for estimating scattered radiation, in particular for correcting radiography measurements  
The radiography of a subject is improved by estimating the scattered radiation it transmits to the detectors. For this, one uses scattered radiation measured effectively through a simulacrum of...
6370417 Method for positioning a catheter in a vessel, and device for implementing the method  
In a method for positioning a catheter that has been inserted into a vessel and a device for implementing the method, the road map technique is used, wherein as a mask image, a three-dimensional...
6272198 Radiation image forming method and apparatus  
A plurality of radiation image signals, which represent radiation images of an object, are obtained by irradiating radiation from different directions to the object and detecting the radiation...
6256367 Monte Carlo scatter correction method for computed tomography of general object geometries  
A method of correcting aberrations caused by target x-ray scatter in three-dimensional images generated by a volumetric computed tomographic system is disclosed. The method uses a Monte Carlo...
6175609 Methods and apparatus for scanning an object in a computed tomography system  
The present invention, in one form, is a system for reducing contribution of scatter signal to an image of an object constructed from projection data acquired during a computed tomography scan....
5953444 Method for improved correction of spectrum hardening artifacts in computed tomography images  
The method disclosed herein includes the steps of providing a computed tomography image having a base component, a first component of a first material, and a second component of a second material,...
5903008 Scatter correction methods and systems in single photon emission computed tomography  
An emission tomographic system for imaging an object of interest is described. The system, in one form, includes a gantry and a patient table. A detector including a collimator is secured to the...
5883972 Method of and apparatus for processing image outside irradiation field  
A radiation image which has been recorded using an irradiation field stop and has an irradiation field is read out and an image representing the radiation image is obtained. The irradiation field...
5845003 Detector z-axis gain correction for a CT system  
The present invention, in one form, corrects any error due to varying z-axis detector cell gains represented in data obtained by a scan in a CT system. In accordance with one form of the present...
5812629 Ultrahigh resolution interferometric x-ray imaging  
The Invention provides practical apparatus and methods for significant improvements to conventional radiography practice. It can image objects having negligible x-ray absorption contrast e.g....
5684855 X-ray CT scanner  
Only an umbra of an X-ray beam is allowed to enter a designated detecting device arrays of an X-ray detector, whereby stable and good X-ray detection signals and images are provided. Even if a...
5668851 X-ray Tomography system with stabilized detector response  
In a CT scanning system having an x-ray source, a plurality of x-ray detector modules, and a plurality of anti-scatter plate modules, signal instability and the associated introduction of...
5666391 X-ray examination system with identification of and compensation for subject-produced scattered radiation to reduce image artifacts  
An x-ray examination apparatus with a detector array having a number of detector elements includes a data correction computer in which the subject-scattered radiation can be numerically determined...
5615279 Method of and apparatus for correcting scattered X-rays for X-ray computerized tomograph  
In a scattered X-ray correction method for an X-ray computerized tomograph, the quantity of X-rays passed through a phantom is measured to be converted into logarithms. Obtained from the...
5610963 Methods and systems for determining the z-axis profile of a detector in a CT system  
Apparatus and methods for generating z-axis profiles for a CT system detector are described. In one form, the method includes the steps of directing x-ray beams having different z-axis centroids...
5602895 Partially-transparent-shield-method for scattered radiation compensation in x-ray imaging  
The disclosed methods for generating scatter-compensated radiation image are based on one irradiating shot of the object. By comparing the detected signal under a partially transparent body (ea....
5418832 Scanning radiographic device with slit, slot and grid  
A scanning radiographic system having reduced scatter and improved tube loading employs a pre-patient slit to form the x-ray beam into a fan beam and a post-patient slot to eliminate scattered...
5406479 Method for rebinning and for correcting cone beam error in a fan beam computed tomographic scanner system  
A method of reconstructing data acquired on a fan beam CT system first rebins the data to parallel beam format using limited angle weighting that fold-over redundant data by adding corner rays of...
5315506 Correction for compton scattering by analysis of spatially dependent energy spectra employing regularization  
A method of reducing the effects of Compton scattered photons detected in a gamma ray detection arrangement includes the steps of receiving data responsive to energy states of the detected photons...
5270925 Method of and device for correcting scattered-radiation effects in X-ray images  
Scattered radiation in an X-ray image causes a reduction of contrast. An estimate of the scattered radiation contribution is obtained by means of a version of the original image which is...
5235528 Method and apparatus for calibrating and correcting magnetic and geometrical distortions in an imaging system  
A method and apparatus to calibrate and correct magnetic and geometrical distortions in an imaging system, specifically a computer tomography (CT) system, includes a calibration object which is...
5214581 Method for object reconstruction from x-ray holograms  
Apparatus for x-ray microholography of living biological materials. A Fourier transform holographic configuration is described as being most suitable for the 3-dimensional recording of the...
5050198 Method and system for processing X-ray image in X-ray equipment  
In X-ray photography by an X-ray equipment, grid images based on only a grid are acquired by a grid image generating circuit under various photograph conditions, and are stored in image memories....
5029192 Computer tomography apparatus with detector which is rotatable separately from the x-ray source  
A computer tomography apparatus has an x-ray source which emits a fan-shaped x-ray beam which irradiates a slice of an examination subject. The x-ray source is rotatable around the examination...
5012498 X-ray tomography device  
The invention concerns an X-ray tomograph device.This device makes it possible to obtain the image (1) of a plane cutting (2) of an object (3). In particular, it comprises an X-ray source (4)...
4995107 Computer tomography apparatus with axially displaceable detector rows  
A computer tomography apparatus includes an x-ray source which irradiates an examination subject, thereby producing attenuated primary radiation, and scatter radiation. A row of detector elements...
4987581 Cam-controlled automatic dynamic focusing for computed tomography  
A dynamic focusing device is provided for an X-ray scanner, the device comprising at least one detector module located in a position to receive, be illuminated by, and respond to X-rays. A source...
4918713 System and method for correcting for scattered x-rays  
The radiation image in a radiation imaging system is improved by extracting a scatter distribution and subtracting the scatter distribution from the radiation image. The scatter distribution is...
4899283 Tomographic apparatus including means to illuminate the bounded field of view from a plurality of directions  
Tomographic imaging with the aid of a line collimator is improved by providing for the illumination of a given linear element of the selected slice from a plurality of different directions. The...
4881251 Computed tomograph apparatus  
A computed tomograph apparatus for obtaining tomograms of a subject under examination comprises a supporting table for supporting the subject, and on which a tomogram image pick-up area is...
4866744 Scattering beam eliminating device for x-ray CT apparatus  
A scattering beam eliminating member is located between an X-ray tube and an X-ray gas detector such that it is intimately bonded to the window of the X-ray detector. The scattering beam...
4837796 X-ray imaging system  
An X-ray imaging system has an X-ray source, an X-ray image detection section, an X-ray mask member, a drive unit, a memory, a calculating section, and an image output unit. An X-ray image is...
4823370 X-ray diagnostic apparatus  
An X-ray generator projects X-rays into an object under examination. An X-ray detector detects the X-ray image data transmitted through the object. The transmitted X-ray image data is digitized by...
4807267 X-ray computed tomography apparatus  
An X-ray computed tomography apparatus is disclosed which includes an X-ray source for irradiating an X-ray, a main detector section for detecting the X-ray passed through a subject and a...
4727562 Measurement of scatter in x-ray imaging  
A scatter radiation compensation method for use in a medical diagnosis x-ray imaging system employs the use of an attenuating material placed in an x-ray beam to attenuate a portion of the beam...
4718076 X-ray imaging apparatus  
An X-ray imaging apparatus comprising an X-ray generator having a cylindrical rotating target, a slit plate having a slit extending in a direction perpendicular to the direction in which an X-ray...
4691332 High energy computed tomography  
Computerized axial tomography is employed with respect to large relatively dense objects such as a solid fuel rocket engine. High energy X-rays, such as a 15 MeV source is used. To develop clean...
4677681 Method for eliminating the diffused radiation in a radiology image  
A method is disclosed for eliminating the diffused radiation in a radiology image. The method fundamentally consists in interposing a mask comprising a finite number of areas absorbent to X-rays...
4670840 Ring artifact correction for computerized tomography  
A method for the correction of ring artifacts in images obtained by rotate-rotate computerized tomography (CT) scanners includes the step of reconstructing an original image, which comprises a...
4656650 X-ray diagnostic apparatus for eliminating scattered X-ray components  
In an X-ray diagnostic apparatus, it is very desirable to mitigate the adverse effect of the scattered X-ray components. When the X-ray shield member is positioned in the X-ray projection area...
4638499 High resolution collimator system for X-ray detector  
High resolution in an X-ray computerized tomography (CT) inspection system is achieved by using a collimator/detector combination to limit the beam width of the X-ray beam incident on a detector...
4549307 X-Ray imaging system having radiation scatter compensation and method  
The image signal in a radiation imaging system is improved by establishing a scattered radiation signal and subtracting the scatter radiation signal from the detected radiation signal. The scatter...
4507733 Photon emission imaging apparatus and method  
System for imaging the distribution of radiation from a distributed radiation source including a scintillator, and photodetectors viewing the scintillator. System enhances image quality by...
4493096 Method of X-ray imaging using slit scanning with controlled target erase  
A method of x-ray imaging the internal features of an object undergoing examination in which the object is scanned with a beam of x-ray radiation. The radiation is transmitted through the object...
4481650 Installation for producing radiographic layer images  
The purpose of the invention is to create a mechanically uncomplicated installation for producing radiographic layer images, making it possible to use small radiation dosages and, however, to...
4466112 Variable detector aperture  
In a rotating fan beam tomographic scanner there is included a variable detector aperture housed within a radiation scatter shield. The scanner includes a diverging source of penetrating radiation...

Matches 101 - 150 out of 173 < 1 2 3 4 >