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6169779 |
Data acquisition sequence for computed tomography scanners
In an improved computed tomography data acquisition sequence, fan-beam or cone-beam projection data are collected in a manner which avoids the need for interpolation during reordering to...
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6167110 |
High voltage x-ray and conventional radiography imaging apparatus and method
A detector (20) for high voltage x-rays includes a plurality of sensor elements (22) with each sensor element being aligned along a respective focal axis (25) with respect to a high voltage x-ray...
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6157696 |
X-ray CT scanner with two-dimensional X-ray detector having unequal element pitch in slice-thickness direction
A multi-slice X-ray CT scanner is provided to realize high resolution and a wide scanned region in a slice-thickness direction for an object. In the X-ray CT scanner, an X-ray beam for slice...
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6148058 |
System and method for real time measurement of detector offset in rotating-patient CT scanner
A rotating-patient computed tomography scanning system in which the detector offset is measured in real time for each scan. At least one x-ray--absorbent reference structure is disposed in the...
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6144718 |
Flexible cable connection for detector module
A flexible cable connection for a detector module is described. The flexible cable allows photodiode output signals to be coupled to the CT system without the need of attaching a pin connector to...
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6137859 |
Method for manufacturing detector system for a computed tomography apparatus
In a method for manufacturing a detector system composed of a number of detector elements respectively disposed at installation positions in a computed tomography (CT) apparatus, the detector...
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6137857 |
Scalable detector for computed tomograph system
A multislice detector array producing an alterable quantity of slices and slice resolutions. In one embodiment, the detector array includes a detector housing, a plurality of detector modules, and...
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6137858 |
Radiation tomography method and apparatus
A radiation tomography method and apparatus which can image at a time a plurality of tomographic images which differ in slice thickness is implemented. A projection image of a subject projected by...
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6134292 |
Methods and apparatus for reducing z-axis non-uniformity artifacts
Methods and apparatus of correcting image data for z-axis non-uniformity in a computed tomography (CT) system are described. In one embodiment, the CT system includes a configurable multislice...
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6118840 |
Methods and apparatus to desensitize incident angle errors on a multi-slice computed tomograph detector
Scintillators having a geometric configurations that substantially prevent x-ray beams from passing entirely through a gap between adjacent scintillators are described. More particularly, if the...
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6118839 |
Multiple slice CT scanner
A computerized tomography system wherein the X-ray source rotates about the subject and moves axially relative to the subject to provide a helical scan. A detector array includes a plurality of...
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6118841 |
Detector array geometry for helical scanning volumetric computed tomography system
In an improved method and apparatus for cone-beam reconstruction, an improved detector array is provided in an asymmetric shape with respect to the translation axis. In a first embodiment, a...
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6115448 |
Photodiode array for a scalable multislice scanning computed tomography system
A high density semiconductor array for a scalable multislice computed tomography system is described. In one embodiment, the semiconductor array includes a plurality of photodiodes arranged in rows...
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6115446 |
Fast reconstruction of fan-beam CT and SPECT
A method and apparatus for reconstructing a tomographic image using the parallel beam filtered backprojection algorithm from fan beam data, q(α, β). The method includes the steps of performing a...
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6115447 |
Multi-slice biopsy with single slice computed tomography
A method for controlling operation of a pre-patient collimator to sweep x-rays across a patient are described. Particularly, and rather than shuttling the patient back and forth to obtain scans of...
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6104776 |
Nondestructive test apparatus
A nondestructive test apparatus for testing a work is formed of a fixed radiation generating device; a rotatable work holding device situated near the radiation generating device; and a rotatable...
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6094469 |
Computed tomography system with stable beam position
A computed tomography system having a fourfold improvement in both short-and long-term beam position stability. A beam-position detector is located at a peripheral edge of the primary fan beam and...
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6091795 |
Area detector array for computer tomography scanning system
A two-dimensional area detector array for a CT scanning system includes a set of alignment grids for aligning individual scintillator crystals with corresponding photodiodes and for preventing...
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6087665 |
Multi-layered scintillators for computed tomograph systems
A multi-layer scintillator having a first and a second layer of scintillation material. In one embodiment, the scintillator first layer has fast scintillation characteristics and the second layer...
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6081576 |
Scalable data acquisition system
A scalable data acquisition system (SDAS) that may be used in connection with both single slice and multislice imaging systems is described. Generally, the SDAS in configured for use in a computed...
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6075835 |
Methods and apparatus for imaging system quality readiness check
The present invention, in one form, is an imaging system which, in one embodiment, utilizes scan data and DAS input signals to determine image quality. More specifically, and in one embodiment, by...
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6067342 |
Digital filmless X-ray projection imaging system and method
A system for and method of producing digital filmless X-ray projection images having resolution and dynamic range characteristics comparable to extant photographic film-based images includes an...
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6056437 |
Methods and apparatus for imaging system detector alignment
The present invention, in one form, is a system which, in one embodiment, determines an x-ray beam z-axis profile and properly positions a detector array. Specifically, in one embodiment, signals...
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6047040 |
Detector signal integration in volumetric CT scanner detector arrays
A multi-slice or volumetric CT system has a 2D array of detector elements arranged in columns along the slice direction and rows along the in-slice direction. Channels in a digital acquisition...
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6041097 |
Method and apparatus for acquiring volumetric image data using flat panel matrix image receptor
A gantry (10) includes a large diameter bearing having an outer race (12) and an inner race (16) which surrounds an examination region. An x-ray tube (18) and collimator (52) are mounted to the...
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6028908 |
X-ray CT scanning apparatus
There is provided an X-ray CT apparatus which can generate high density data from data acquired by virtue of a helical scan and then execute image reconstruction based on the high density data. The...
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6014420 |
X-ray CT apparatus
An X-ray CT apparatus is disclosed which has a simple construction and yet is capable of correcting the sensitivity of each X-ray detecting element in response to a focal shift of an X-ray tube. A...
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6005908 |
X-ray computed tomography apparatus with radiation detector which reduces image unsharpness
An X-ray computed tomography apparatus has a radiation detector composed of X-ray converters so that the scattering of light in a scintillator or the inductive disturbance in a directly converting...
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5991357 |
Integrated radiation detecting and collimating assembly for X-ray tomography system
An integrated radiation detecting and collimating assembly for an x-ray tomography scanning system. The assembly includes a housing which mounts to a spine of the system and aligns corresponding...
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5991358 |
Data acquisition system for generating accurate projection data in a CT scanner
A data acquisition system for use in a CT scanner comprises an analog-to-digital converter for generating digital signals in response to analog signals representative of projection data taken at a...
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5987157 |
Image reconstruction method for a multi-row detector computed tomography apparatus operable in a spiral/helical scan mode
In an image reconstruction method for a multi-row detector computed tomography apparatus operable in a helical/spiral scan mode, a spiral reconstruction with arbitrary pitch and an improvement of...
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5982846 |
Methods and apparatus for dose reduction in a computed tomograph
Methods and apparatus for dose reduction in a computed tomography (CT) system are described. In one embodiment, the CT system includes a configurable multislice detector array and an adjustable...
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5974110 |
Helical reconstruction algorithm
The present invention, in one form, is a method for performing image reconstruction from projection data acquired in a multislice helical scan. More specifically, helical weighting factors are...
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5974109 |
Methods and apparatus for cell ganging in a multislice computed tomography system
A combination of double and triple cell ganging which resolves any incompatibility between the number of detector channels and the lower number of DAS channels without requiring any significant...
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5970113 |
Computed tomography scanning apparatus and method with temperature compensation for dark current offsets
A method and apparatus for performing CT scans of baggage being carried or loaded onto commercial aircraft are described. The CT baggage scanner of the invention includes numerous features which...
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5949843 |
X-ray tomography apparatus
An X-ray computer tomography apparatus equipped with an X-ray scanner for converting X-rays emitted from an X-ray source to a fan beam by a collimator, irradiating the fan beam to an object and...
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5946371 |
Method and apparatus for volumetric computed tomography scanning with offset symmetric or asymmetric detector system
A CT scanner includes support means for supporting a radiation source and a detection system in a predetermined spatial relationship and for rotation about a rotation axis, and means for providing...
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5917878 |
Measurement system for a computed tomography apparatus
The individual detector elements of an X-ray detector in a computed tomography apparatus are mounted on a formed part composed of insulator material, on whose surface interconnects are applied that...
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5912938 |
Tomography system having detectors optimized for parallel beam image reconstruction
An x-ray scanning system including an x-ray source defining a focal spot from which radiation is emitted, an x-ray detector assembly including a plurality of x-ray detectors cooperative with the...
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5889833 |
High speed computed tomography device and method
An x-ray computed tomography device and method where backprojection is performed with pixels each having their own back projection range. The range is determined using a two-dimensional...
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5867554 |
Spiral scan computed tomography apparatus having a modular surface detector for radiation
A computed tomography apparatus has a radiation detector formed by several parallel detector rows of detector elements. A flexible selection of slices is enabled with a simple construction by...
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5857007 |
DAS housing with enhanced heat transfer capability for CT imaging system
In a CT imaging system which includes a gantry having a rotatable ring member and a DAS comprising circuit boards grouped in a selected number of sets, a DAS housing is provided which is disposed...
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5848116 |
X-ray detection apparatus
An X-ray CT apparatus comprises an X-ray tube for irradiating X-ray onto a target object, a xenon gas type detector for detecting the X-ray passing through the target object and for outputting an...
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5848117 |
Apparatus and method for computed tomography scanning using halfscan reconstruction with asymmetric detector system
A method and apparatus for halfscan reconstruction in a CT scanning system using an asymmetric detector system are described. In halfscan asymmetric (HSA) reconstruction, a halfscan reconstruction...
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5847499 |
Apparatus for generating multiple X-ray images of an object from a single X-ray exposure
An x-ray image intensifier includes a photoconductive x-ray detector having an electro-optic light modulator disposed on a photoconductive detector layer. The photoconductive x-ray detector absorbs...
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5841831 |
X-ray computed tomography apparatus
In an x-ray computed tomography apparatus the source of X-rays and the detector are able to scan a volume of the examination subject in a short time. The X-ray source contains an anode that is...
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5828718 |
Method and apparatus for helical computed tomography scanning with asymmetric detector system
A system for and method of generating a reconstructed tomographic image is described using an asymmetric detector array during a helical scan. An improved helical weighting system applies a helical...
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5822392 |
Multi-resolution detection for increasing in an x-ray imaging implementation of an object
The present invention discloses a multi-resolution detector for use in an x-ray imaging implementation such as computed tomography and digital radiography. The multi-resolution detector includes a...
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5818897 |
Quadrature transverse CT detection system
The disclosed detector system includes a two dimensional array of detectors for use in generating a volumetric scan of objects moving through a scanner. The array can comprise rows and columns of...
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5815546 |
Computed tomography apparatus for conducting spiral scan with the x-ray detector tilted relative to the system axis
A computed tomography apparatus has a surface X-ray detector composed of detection elements, with all detectors being usable in a spiral scan wherein the detector and an X-ray radiator are rotated...
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