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119 results about "Correction for attenuation" patented technology
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Correction for attenuation is a statistical procedure developed by Charles Spearman in 1904 that is used to "rid a correlation coefficient from the weakening effect of measurement error" (Jensen, 1998), a phenomenon known as regression dilution. In measurement and statistics, the correction is also called disattenuation. The correction assures that the correlation across data units (for example, people) between two sets of variables is estimated in a manner that accounts for error contained within the measurement of those variables.
Apparatus and methods for imaging and attenuation correction
Imaging apparatus, is provided, comprising a first device, for obtaining a first image, by a first modality, selected from the group consisting of SPECT, PET, CT, an extracorporeal gamma scan, an extracorporeal beta scan, x-rays, an intracorporeal gamma scan, an intracorporeal beta scan, an intravascular gamma scan, an intravascular beta scan, and a combination thereof, and a second device, for obtaining a second, structural image, by a second modality, selected from the group consisting of a three-dimensional ultrasound, an MRI operative by an internal magnetic field, an extracorporeal ultrasound, an extracorporeal MRI operative by an external magnetic field, an intracorporeal ultrasound, an intracorporeal MRI operative by an external magnetic field, an intravascular ultrasound, and a combination thereof, and wherein the apparatus further includes a computerized system, configured to construct an attenuation map, for the first image, based on the second, structural image. Additionally, the computerized system is configured to display an attenuation-corrected first image as well as a superposition of the attenuation-corrected first image and the second, structural image. Furthermore, the apparatus is operative to guide an in-vivo instrument based on the superposition.
Owner:SPECTRUM DYNAMICS MEDICAL LTD
Fluid Delivery System, Fluid Path Set, and Pressure Isolation Mechanism with Hemodynamic Pressure Dampening Correction
InactiveUS20070161970A1Prevent leakageReduce and eliminate flowMedical devicesCatheterHemodynamicsSurgery
The fluid delivery system includes a pressurizing device for delivering injection fluid under pressure, a low pressure fluid delivery system, and a pressure isolation mechanism. The pressure isolation mechanism includes a first lumen associated with the pressurizing device, a second lumen associated with the low pressure fluid delivery system, and a pressure isolation port. The first valve is in a normally open position permitting fluid communication between the first lumen and the second lumen and movable to a closed position when fluid pressure in the first lumen reaches a predetermined pressure level. The first valve isolates the pressure isolation port from the first lumen in the closed position. A second valve is associated with the second lumen and regulates fluid flow through the second lumen. The second valve may be a disk valve defining one or more passageways in the form of slits through the body of the disk valve.
Owner:MEDRAD INC.
Apparatus and methods for imaging and attenuation correction
InactiveUS7652259B2Ultrasonic/sonic/infrasonic diagnosticsImage enhancementDiagnostic Radiology ModalitySonification
Owner:SPECTRUM DYNAMICS MEDICAL LTD
Fluid Delivery System, Fluid Path Set, and Pressure Isolation Mechanism with Hemodynamic Pressure Dampening Correction
ActiveUS20110092828A1Reduce and eliminate flowPrevent leakageMedical devicesCatheterHemodynamicsSurgery
The fluid delivery system includes a pressurizing device for delivering injection fluid under pressure, a low pressure fluid delivery system, and a pressure isolation mechanism. The pressure isolation mechanism includes a first lumen associated with the pressurizing device, a second lumen associated with the low pressure fluid delivery system, and a pressure isolation port. The first valve is in a normally open position permitting fluid communication between the first lumen and the second lumen and movable to a closed position when fluid pressure in the first lumen reaches a predetermined pressure level. The first valve isolates the pressure isolation port from the first lumen in the closed position. A second valve is associated with the second lumen and regulates fluid flow through the second lumen. The second valve may be a disk valve defining one or more passageways in the form of slits through the body of the disk valve.
Owner:BAYER HEALTHCARE LLC
Method for acquiring PET and CT images
InactiveUS7603165B2Easy to correctAccurate scatter correctionMaterial analysis using wave/particle radiationRadiation/particle handlingDiagnostic Radiology ModalityData set
A combined PET and X-Ray CT tomograph for acquiring CT and PET images sequentially in a single device, overcoming alignment problems due to internal organ movement, variations in scanner bed profile, and positioning of the patient for the scan. In order to achieve good signal-to-noise (SNR) for imaging any region of the body, an improvement to both the CT-based attenuation correction procedure and the uniformity of the noise structure in the PET emission scan is provided. The PET / CT scanner includes an X-ray CT and two arrays of PET detectors mounted on a single support within the same gantry, and rotate the support to acquire a full projection data set for both imaging modalities. The tomograph acquires functional and anatomical images which are accurately co-registered, without the use of external markers or internal landmarks.
Owner:SIEMENS MEDICAL SOLUTIONS USA INC
Multi modality imaging methods and apparatus
A method for correcting emission data from Positron Emission Tomography (PET) or SPECT includes generating a plurality of computed tomography (CT) image data, selecting a portion of the CT image data, processing the selected CT data to generate a plurality of attenuation correction (CTAC) factors at the appropriate energy of the emission data, weighting the CTAC factors to generate an emission attenuation correction map wherein the weights are determined based on the axial location and the slice thickness of the CT data and the axial location and the slice thickness of the PET or SPECT data, and utilizing the generated attenuation correction map to generate an attenuation corrected PET image.
Owner:GENERAL ELECTRIC CO
Continuous tomography bed motion data processing apparatus and method
InactiveUS6915004B2Reconstruction from projectionMaterial analysis using wave/particle radiationData synchronizationUltrasound attenuation
Apparatus and methods for three dimensional image reconstruction from data acquired in a positron emission tomograph (PET). This invention uses a parallel / pipelined architecture for processing the acquired data as it is acquired from the scanner. The asynchronously acquired data is synchronously stepped through the stages performing histogramming, normalization, transmission / attenuation, Mu image reconstruction, attenuation correction, rebinning, image reconstruction, scatter correction, and image display.
Owner:SIEMENS MEDICAL SOLUTIONS USA INC
3D image reconstructing method for a positron CT apparatus, and positron CT apparatus
InactiveUS20070018108A1Eliminate unevennessReduce image qualityMaterial analysis by optical meansX/gamma/cosmic radiation measurmentUltrasound attenuation3d image
Image quality deterioration due to a drop in resolution or lowering of S / N ratio while reducing the amount of data stored during a 3D data acquisition process, and shortening the time from the start of an examination to the end of imaging. The method and apparatus of this invention perform, in parallel with the 3D data acquisition process, addition of sinograms, reading of subsets of the sinograms having been added, and image reconstruction. Consequently, the amount of data stored is reduced, and the time from the start of an examination to the end of imaging is shortened. At the same time, since 3D iterative reconstruction is not accompanied by conversion from 3D data to 2D data, a drop in resolution due to errors occurring with the conversion from 3D data to 2D data is avoided. The 3D iterative reconstruction can directly incorporate processes such as an attenuation correction process. It is thus possible to avoid also a lowering of S / N ratio resulting from an indirect incorporation of such processes.
Owner:SHIMADZU CORP
Computer program, method, and system for hybrid CT attenuation correction
ActiveUS7378660B2Material analysis using wave/particle radiationHandling using diaphragms/collimetersUltrasound attenuationAlgorithm
Embodiments of the present invention provide a computer program, method, and system to facilitate hybrid CT attenuation correction. In one embodiment, the method generally includes acquiring data from a scanner, utilizing an ordered subset expectation maximization-bayesian algorithm to reconstruct the acquired data, and forward projecting the reconstructed data. Such a configuration minimizes the computing resources required for reconstruction and improves attenuation correction accuracy.
Owner:CARDIOVASCULAR IMAGING TECH
PET image acquiring method and system
InactiveCN105147312AReduce radiation timeImprove clinical experienceComputerised tomographsTomographyUltrasound attenuationMotion field
The invention provides a PET image acquiring method and system. The method comprises registering a first PET image and a corrected second PET image to acquire a motion field of an image space between the corrected first PET image and a second PET image; harmonizing a first CT image using the motion field to acquire a second CT image of a scanned object; carrying out attenuation correction on second PET data using the second CT image to acquire the corrected second PET iamge. According to the PET image acquiring method and system, the corrected second PET image can be acquired through carrying out attenuation correction on second PET data using the second CT image, a process for acquiring the second CT image through secondary CT scanning can be omitted, time of X-ray radiation during CT scanning can be shortened, and a better clinic experience can be achieved.
Owner:SHANGHAI UNITED IMAGING HEALTHCARE
Attenuation rectifying method and system
ActiveCN103054605AReduce correctionImage enhancementComputerised tomographsUltrasound attenuationComputed tomography
The invention discloses an attenuation rectifying method and system. The attenuation rectifying method includes: collecting standard polyethylene terephthalate (PET) data and a standard computed tomography (CT) image under the standard time phase and nonstandard PET data under various nonstandard time phases; performing image reconstruction on the standard PET data under the standard time phase and the nonstandard PET data under the nonstandard time phases to obtain a standard PET image and nonstandard PET images under the various nonstandard time phases; respectively obtaining the motion information of the nonstandard PET images corresponding to the standard PET image under the various nonstandard time phases; performing motion compensation on the standard CT images according to the various motion information to obtain the nonstandard CT images under the various nonstandard time phases; performing attenuation rectifying on the standard PET data through the standard CT image, and performing attenuation rectifying on the nonstandard PET data under the same time phase through the nonstandard CT images under the various nonstandard time phases so as to obtain the CT images of different phase intervals without repeated CT scanning.
Owner:SHENYANG INTELLIGENT NEUCLEAR MEDICAL TECH CO LTD
Multi modality imaging methods and apparatus
ActiveUS7348564B2Material analysis by optical meansCalibration apparatusUltrasound attenuationComputed tomography
Owner:GENERAL ELECTRIC CO
Systems and methods for correcting a positron emission tomography emission image
InactiveUS7507968B2Reconstruction from projectionMaterial analysis using wave/particle radiationUltrasound attenuationComputing tomography
A method for correcting a positron emission tomography (PET) emission image is described. The method includes obtaining a PET emission sinogram of an object, obtaining a computed tomography (CT) image for a scanned portion of the object, the object having a truncated portion outside a field of view (FOV) of a CT image, determining a correction set of CT data based on a measured set of CT data within the CT sinogram, generating modified attenuation correction factors from the measured and correction sets of CT data, and correcting the PET sinogram using the modified attenuation correction factors.
Owner:GE MEDICAL SYST GLOBAL TECH CO LLC
Method and system for acquiring PET image
ActiveCN106491151ANo need to restrict movement for long periods of timeAvoid Multiple CT RadiationsComputerised tomographsTomographyUltrasound attenuationField data
The invention discloses a method and system for acquiring a PET image. The method comprises the steps that PET scanning data and CT scanning data at a first time point are acquired, and a first PET image Img1 and a first CT image Img0 are acquired; PET scanning data at a second time point and a second PET image Img2 are acquired, wherein CT attenuation correction is not carried out to the second PET image during reconstruction; registration is conducted the second PET image Img2 and the first PET image Img1, deformation field data TF12 between the two images is acquired and acts on the first CT image Img0, an attenuation correction item U2 of the second PET image is acquired, and a scattering correction item S2 of the second PET image is acquired according to an SSS model; an attenuation correction item U2final and a scattering correction item S2final of the final second PET image are acquired; and the final second PET image is acquired.
Owner:SHANGHAI UNITED IMAGING HEALTHCARE
Gamma camera and CT system
InactiveUS6878941B2Reduce rateLow powerRadiation/particle handlingMaterial analysis by optical meansCardiac cycleData acquisition
Apparatus for producing attenuation corrected nuclear medicine images of patients, comprising:at least one gamma camera head that acquires nuclear image data suitable to produce a nuclear tomographic image at a first controllable rotation rate about an axis;at least one X-ray CT imager that acquires X-ray data suitable to produce an attenuation image for correction of the nuclear tomographic image at a second controllable rotation rate about the axis; anda controller that controls the data acquisition and first and second rotation rates to selectively provide at least one of the following modes of operation:(i) a movement gated NM imaging mode in which the second rotation rate is substantially higher than the first rotation rate and the data from each view of the X-ray acquisition is associated with one of a plurality of respiration gated time periods;(ii) a cardiac gated NM imaging mode in which the second rotation rate is substantially higher than the first rotation rate and the data from each view of the X-ray acquisition for different rotations is averaged, wherein the X-ray data is not correlated with the cardiac cycle; and(iii) a cardiac gated NM imaging mode in which the second rotation rate is higher than the first rotation rate and the X-ray data is binned in accordance with a same binning as the NM data.
Owner:ELGEMS
Image attenuation correction method and device
ActiveCN107638188ATroubleshooting Attenuation ArtifactsImprove image qualityComputerised tomographsTomographyData setCompanion animal
The invention discloses an image attenuation correction method and device and belongs to the technical field of medical imaging. The image attenuation correction method comprises the steps that a first mode image is reconstructed according to first image data and is converted into an attenuation correction image; a second mode image of each gating phase is reconstructed according to second image data; image registration is conducted on the attenuation correction image and the second mode image corresponding to each gating phase to obtain an attenuation correction image of each gating phase; according to the attenuation correction image of each gating phase, the second mode image of each gating phase is reconstructed. The problem is solved that in the relevant art, the matching of PET and CT images is reduced due to the movement in the examination process or the physiological process of a subject, accordingly attenuation correction malposition of the PET images is likely to produce andattenuation artifacts are produced in the PET images, and the advantages of attenuation correction of PET data and quality improvement of PET images are achieved.
Owner:JIANGSU SINOGRAM MEDICAL TECH CO LTD
System and method for the generation of attenuation correction maps from MR images
A method for generating a positron emission tomography (PET) attenuation correction map from magnetic resonance (MR) images includes segmenting a 3-dimensional (3D) magnetic resonance (MR) whole-body image of a patient into low-signal regions, fat regions, and soft tissue regions; classifying the low-signal regions as either lungs, bones, or air by identifying lungs, identifying an abdominal station, and identifying a lower body station; and generating an attenuation map from the segmentation result by replacing the segmentation labels with corresponding representative attenuation coefficients.
Owner:SIEMENS HEALTHCARE GMBH
Generating Attenuation Correction Maps for Combined Modality Imaging Studies and Improving Generated Attenuation Correction Maps Using MLAA and DCC Algorithms
ActiveUS20140056500A1Reduce noiseReduce the numberReconstruction from projectionCharacter and pattern recognitionWhole bodyCompanion animal
The DCC (Data Consistency Condition) algorithm is used in combination with MLAA (Maximum Likelihood reconstruction of Attenuation and Activity) to generate extended attenuation correction maps for nuclear medicine imaging studies. MLAA and DCC are complementary algorithms that can be used to determine the accuracy of the mu-map based on PET data. MLAA helps to estimate the mu-values based on the biodistribution of the tracer while DCC checks if the consistency conditions are met for a given mu-map. These methods are combined to get a better estimation of the mu-values. In gated MR / PET cardiac studies, the PET data is framed into multiple gates and a series of MR based mu-maps corresponding to each gate is generated. The PET data from all gates is combined. Once the extended mu-map is generated the central region is replaced with the MR based mu-map corresponding to that particular gate. On the other hand, in dynamic PET studies the uptake in the patient's arms reaches a steady state only after the tracer distributes throughout the body. Hence, for dynamic scans, the projection data of all frames is summed and used to generate the MLAA based extended mu-map for all frames.
Owner:SIEMENS MEDICAL SOLUTIONS USA INC
PET image reconstruction method, device and equipment and medium
ActiveCN109697741AImprove rebuild speedReal-time previewReconstruction from projectionNeural learning methodsBiological bodyUltrasound attenuation
The embodiment of the invention discloses a PET image reconstruction method, device and equipment and a medium. The method comprises the steps that a corresponding CT image and an unattenuated and corrected PET image are obtained based on organism scanning; and the CT image and the PET image which is not subjected to attenuation correction are input into a pre-trained neural network model to obtain an attenuation-corrected PET image. By the adoption of the technical scheme, the reconstruction speed of the PET image can be greatly increased, and therefore real-time preview of the PET image is achieved.
Owner:SHANGHAI UNITED IMAGING INTELLIGENT MEDICAL TECH CO LTD
Image processing apparatus and image processing method
When a user instructs photographing by operating an operating unit, an image captured by an image sensor is stored as a photographed image in a memory. When a mode for performing color fading correction is set, the CPU instructs an image processing device to extract, from the photographed image, an area which is supposed to bring about color fading. The image processing device generates a binary image by detecting edges of the area.
Owner:CASIO COMPUTER CO LTD
Methods and apparatus for analyzing ultrasound images
A method of analyzing an ultrasound image of a target volume having therein at least two types of substances is disclosed. The method comprises: dividing a region-of-interest of the image to a set of mini-segments. The method further comprises, for each mini-segment, calculating at least two representative intensity values, respectively representing the at least two types of substances. The method further comprises applying attenuation corrections to each representative intensity value of at least a subset of the set of mini-segments, so as to map the region-of-interest according to the at least two types of substances.
Owner:RAMOT AT TEL AVIV UNIV LTD
Imaging method and imaging system
The invention provides an imaging method. The imaging method comprise: CT picture is obtained by scanning with computer chromatography(CT); PET data is obtained by probing with positron emission chromatography(PET);the PET data is divided into a plurality of PTE data of expected phase position; according to the multiple PET data, unattenuated and uncorrected PED(NAC-PET) picture of corresponding expected phase position is respectively reconstructed; a NAC-PET picture in the multiple NAC-PET pictures of expected phase position, which is mostly matched with the CT picture, is confirmed and become a picture of reference expected phase position; other NAC-PET pictures of expected phase position are confirmed, the deformation field of the picture of reference expected phase position is confirmed; and at least according to the deformation field, the PET data is utilized to reconstructed PET pictures. The invention also discloses a imaging system.
Owner:SHENYANG INTELLIGENT NEUCLEAR MEDICAL TECH CO LTD
Attenuation correction in positron emission tomography using magnetic resonance imaging
In one embodiment, a method includes performing a magnetic resonance (MR) imaging sequence to acquire MR image slices or volumes of a first station representative of a portion of a patient; applying a first phase field algorithm to the first station to determine a body contour of the patient in the first station; identifying a contour of a first anatomy of interest within the body contour of the first station using the first phase field algorithm or a second phase field algorithm; segmenting the first anatomy of interest based on the identified contour of the first anatomy of interest; correlating first attenuation information to the segmented first anatomy of interest; and modifying a positron emission tomography (PET) image based at least on the first correlated attenuation information.
Owner:GENERAL ELECTRIC CO
Gamma camera and CT system
InactiveUS20050006586A1Easy to adjustSimple structureRadiation/particle handlingMaterial analysis by optical meansCardiac cycleX-ray
Apparatus for producing attenuation corrected nuclear medicine images of patients, comprising: at least one gamma camera head that acquires nuclear image data suitable to produce a nuclear tomographic image at a first controllable rotation rate about an axis; at least one X-ray CT imager that acquires X-ray data suitable to produce an attenuation image for correction of the nuclear tomographic image at a second controllable rotation rate about the axis; and a controller that controls the data acquisition and first and second rotation rates to selectively provide at least one of the following modes of operation: (i) a movement gated NM imaging mode in which the second rotation rate is substantially higher than the first rotation rate and the data from each view of the X-ray acquisition is associated with one of a plurality of respiration gated time periods; (ii) a cardiac gated NM imaging mode in which the second rotation rate is substantially higher than the first rotation rate and the data from each view of the X-ray acquisition for different rotations is averaged, wherein the X-ray data is not correlated with the cardiac cycle; and (iii) a cardiac gated NM imaging mode in which the second rotation rate is higher than the first rotation rate and the X-ray data is binned in accordance with a same binning as the NM data.
Owner:ELGEMS
Image diagnosis apparatus and image diagnosis method
InactiveUS20100158336A1Correct position offsetReconstruction from projectionCharacter and pattern recognitionUltrasound attenuationImage diagnosis
A detector detects gamma-rays emitted from inside an imaging region. An acquisition unit acquires a plurality of first projection data sets associated with a plurality of projection angles via the detector. An attenuation-correction unit attenuation-correct the plurality of first projection data sets based on a first CT image associated with the imaging region to generate a plurality of second projection data sets associated with the plurality of projection angles. An index calculation unit calculates an index based on the plurality of second projection data sets. The index is corresponding to a degree of positional offset between the imaging region at the time of acquisition of a plurality of third projection data sets associated with the first CT image and the imaging region at the time of acquisition of the plurality of first projection data sets.
Owner:KK TOSHIBA +1
Laser beam scanning apparatus, image forming apparatus, and laser beam scanning method
A laser beam scanning apparatus includes: a laser oscillating unit that outputs a laser beam; a laser beam scanning unit that scans and irradiates the laser beam in a main scanning direction on a photosensitive member; an error signal generating unit that monitors intensity of a laser beam and generates an error signal between output intensity of the laser oscillating unit and a reference value; a correction signal generating unit that generates a correction signal for correcting intensity of a laser beam along the main scanning direction to be constant; a correction signal converting unit that converts a correction signal into an adapted correction signal by attenuating the correction signal; and a laser control signal generating unit that holds, during the image formation period, a reference signal generated on the basis of the error signal and applies the adapted correction signal to the reference signal to generate a laser control signal for determining intensity of a laser beam outputted from the laser oscillating unit.
Owner:KK TOSHIBA +1
Medical image processing method, system and device and computer readable medium
The invention provides a medical image processing method, system and device and a computer readable storage medium. The method comprises the steps that first modal image data of a target object is acquired; based on the first modal image data of the target object, a first image reconstruction algorithm is used for generating an initial attenuation image of the target object; a machine learning model is used for processing the initial attenuation image of the target object to obtain an optimized attenuation image of the target object; according to the optimized attenuation image of the target object, attenuation correction is carried out on the first modal image data of the target object to obtain a first modal image after attenuation correction, or according to the optimized attenuation image of the target object, a second modal image of the target object is determined. The medical image processing method, system and device and the computer readable medium can be used for obtaining themore accurate attenuation image under the situation that a patient is free of additional scanning.
Owner:SHANGHAI UNITED IMAGING HEALTHCARE
Multiple modality cardiac imaging
InactiveCN103458790AEasy diagnosisReduce inspection costsReconstruction from projectionComputerised tomographsFlat panel detectorUltrasound attenuation
A multiple modality imaging system 10 for cardiac imaging includes x-ray scanners 24,30 which acquires contrast enhanced CT projection data of coronary arteries with a laterally offset flat panel detector and SPECT imaging scanners 40a,40b, which share the same examination region and gantry as the x-ray scanners, acquires nuclear projection data of the coronary arteries. A CT reconstruction processor 34 generates a 3D coronary artery image representation, at least one planar coronary artery angiogram, and a 3D attenuation correction map from the acquired CT projection data. A SPECT reconstruction processor 44 corrects the acquired nuclear projection data based on the generated attenuation correction map and generates a SPECT image representation of the coronary arteries from the corrected nuclear projection data. A fusion processor 54 combines the nuclear image representation, the 3D vessel image representation, and the at least one planar vessel angiogram into a composite image.
Owner:KONINKLJIJKE PHILIPS NV
Apparatus and methods for generating a planar image
InactiveUS20110110570A1Reconstruction from projectionCharacter and pattern recognitionUltrasound attenuationLines of response
Owner:GENERAL ELECTRIC CO
Coincidence SPECT tumor imaging quantitative analysis technology and application in tumor assessment
The invention relates to a tumor imaging quantitative detection technology, in particular to a method for quantitatively measuring a tumor standard uptake value, a thin body standard uptake value, a metabolic volume and total glucolysis through Coincidence SPECT or SPECT / CT and application of the method in tumor assessment. The implementation steps of the method comprise an image acquisition step, a scatter correction step, a nuclide physical decay correction step, a movement correction step, a tissue attenuation correction step, an image spatial resolution recovery step, a noise removal step, a standard uptake value calculation step and a tumor therapeutic effect assessment step. By means of the technological means of the Coincidence SPECT tumor imaging quantitative analysis technology and the application in tumor assessment, the clinical problem of quantitatively measuring the tumor standard uptake value, the thin body standard uptake value, the metabolic volume and the total glucolysis is solved through the Coincidence SPECT and the SPECT / CT, and the technology can be used in the clinical assessment of tumor.
Owner:刘丽 +1
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