|| List of recent Tomography-related patents
| Compensated crosswell tomography methods and systems|
A method and system to compensate for inaccuracies in crosswell tomography is presented. The method includes obtaining data from at least two receivers in response to transmissions from at least two transmitters.
| Method for estimating flow rates and pressure gradients in arterial networks from patient specific computed tomography angiogram-based contrast distribution data|
An embodiment in accordance with the present invention provides a method for non-invasively determining the functional severity of arterial stenosis in a selected portion of an arterial network. The method includes gathering patient-specific data related to concentration of a contrast agent within an arterial network using a coronary computed tomography angiography scan (ccta).
| Novel precursors of glutamate derivatives|
This invention relates to novel precursors suitable for 18f radiolabeling of glutamate derivatives, methods for preparing such compounds and its intermediates, compositions comprising such compounds, kits comprising such compounds or compositions and methods for 18f radiolabeling of glutamate derivatives wherein the obtained 18f radiolabeled glutamate derivatives are suitable for diagnostic imaging by positron emission tomography (pet) of proliferative diseases e.g. Tumor in mammals..
| Calibration and normalization systems and methods for radiopharmaceutical synthesizers|
The present invention relates to calibration and normalization systems and methods for ensuring the quality of radiopharmaceuticals during the synthesis thereof, such as radiopharmaceuticals used in positron emission tomography (pet) and single-photon emission computed tomography (spect).. .
| Methods and computer program products for quantitative three-dimensional image correction and clinical parameter computation in optical coherence tomography|
Methods and computer program products for quantitative three-dimensional (“3d”) image correction in optical coherence tomography. Using the methods and computer program products, index interface (refracting) surfaces from the raw optical coherence tomography (“oct”) dataset from an oct system can be segmented.
| Apparatus and method for capturing a vital vascular fingerprint|
A method using optical coherence tomography to capture the microvascular network of the superficial layer of the finger skin for the purpose of fingerprint authentication and liveness detection. At the dermal papilla region, the vascular pattern follows the same pattern of the fingerprint and this vascular pattern forms a live vascular fingerprint.
| Extremity imaging apparatus for cone beam computed tomography|
An apparatus for cone beam computed tomography of an extremity has a digital radiation detector and a first device to move the detector along a circular detector path extending so that the detector moves both at least partially around a first extremity of the patient and between the first extremity and a second, adjacent extremity. The detector path has radius r1 sufficient to position the extremity approximately centered in the detector path.
| Method for scattering correction for sparsely distributed stationary detectors and rotating x-ray source|
A spectral computed tomography scanner apparatus, including a rotating x-ray source, a plurality of fixed energy-discriminating detectors, a processor that generates a shadow map that indicates, for each detector/view angle, a shadow state of the detector, the shadow state indicating that one of x-rays are completely blocked by a second detector and do not reach the detector, the x-rays are partially blocked by the second detector and partially reach the detector, the x-rays are not blocked by any of the detectors and reach the detector, and the detector is not with the scan field of view at the view angle, and a controller configured to cause the scanner apparatus to perform a scan of an object over a first range of view angles to collect view data, wherein the processor is configured to perform scatter correction using the collected view data and the generated shadow map.. .
| Method of motion correction in optical coherence tomography imaging|
An image data set acquired by an optical coherence tomography (oct) system is corrected for effects due to motion of the sample. A first set of a-scans is acquired within a time short enough to avoid any significant motion of the sample.
| Mr electrical properties tomography|
The invention relates to a method of mr imaging of an object (10) placed in an examination volume of a mr device (1). It is an object of the invention to enable improved electrical properties tomography.
| Radiation tomography apparatus|
The disclosure has one object to provide a radiation tomography apparatus of a low price that facilitates a design change of a detector ring to suppress costs of development. The radiation tomography apparatus according to the disclosure includes a plurality of modules configured to receive detected data from different radiation detectors.
|Computed tomography calibration systems and methods|
According to certain embodiments of the invention, computer hardware and software can perform single or dual-energy decomposition calculations and predict ct values for either single-energy or dual energy ct from basis material decomposition estimates derived using theoretical models. Using that information, the computer hardware and software can (among other things) present one dimensional information from a ct scanner, such as representative pixel value, in two dimensions, such as a line in two dimensional basis material space..
|Near-infrared super-continuum lasers for early detection of breast and other cancers|
A system and method for using near-infrared or short-wave infrared (swir) light sources for early detection and monitoring of breast cancer, as well as other kinds of cancers may detect decreases in lipid content and increases in collagen content, possibly with a shift in the collagen peak wavelengths and changes in spectral features associated with hemoglobin and water content as well. Wavelength ranges between 1000-1400 nm and 1600-1800 nm may permit relatively high penetration depths because they fall within local minima of water absorption, scattering loss decreases with increasing wavelength, and they have characteristic signatures corresponding to overtone and combination bands from chemical bonds of interest, such as hydrocarbons.
|Interfacing systems, devices, and methods for optical imaging|
An imaging interface for diffuse optical tomography of breast includes a plurality of concentric rings. Each concentric ring can include a plurality of optical input/output apertures arranged on a radially inner surface thereof.
|Methods and systems for imaging tissue motion using optical coherence tomography|
A system and method for measuring tissue motion within a living tissue of the anterior segment and aqueous outflow system of the eye in a subject are provided. Tissue movements are extracted from a plurality of images acquired from the living tissue using an optical coherence tomography system.
|Assisted guidance and navigation method in intraoral surgery|
An assisted guidance and navigation method in intraoral surgeries is a method using computerized tomography (ct) photography and an optical positioning system to track medical appliances, the method including: first providing an optical positioning treatment instrument and an optical positioning device; then obtaining image data of the intraoral tissue receiving treatment through ct photography, precisely displaying actions of the treatment instrument in the image data, and real-time checking an image and guidance and navigation. Therefore, during the surgery, the existing use habits of the physicians are not affected and accurate and convenient auxiliary information is provided, and attention is paid to using the treatment instrument in physical environments such as a patient's tooth or dental model..
|Diagnostic method and treatment|
Methods for detecting early stage fungal infection (and especially esca or esca-like infections) in woody plants are disclosed, using x-ray tomographic imaging. In preferred embodiments, axial x-ray tomography is employed, with radiodense regions of the tomograms indicating the location of such infection.
|Methods for analyzing absorbent articles|
A method for analyzing an absorbent article may include providing a three-dimensional computed tomography data set comprising a mannequin image and an article image. The article image may be constructed from projections collected while the absorbent article is fitted to a mannequin.
|Apparatus and method for angular response calibration of photon-counting detectors in sparse spectral computed tomography imaging|
A method for detector angular response calibration in computed-tomography (ct) comprising capturing incident x-ray photons, emitted from an x-ray source, via a plurality of energy-discriminating detectors, determining photon counts of the captured incident x-ray photons in a plurality of energy windows at each energy-discriminating detector, and adjusting the photon counts based on a pre-determined detector angular response calibration look-up table for a given view for each energy-discriminating detector at each energy window.. .
|Apparatus and method for count loss calibration of photon-counting detectors in spectral computed tomography imaging|
A method for photon count-loss calibration in a computed-tomography (ct) scanner, including capturing incident x-ray photons via a plurality of energy-discriminating detectors, determining photon counts of the captured incident x-ray photons in a plurality of energy windows at each energy-discriminating detector, and adjusting the determined photon counts in each energy window for each energy-discriminating detector based on a pre-determined photon count-loss look-up table and the determined photon counts.. .
|Computed tomography imaging process and system|
A computed tomography imaging process, including: acquiring projection images of an object by detecting radiation that has passed through the object for respective different relative orientations of the object and the radiation; and processing the projection images to generate a tomogram of the object; wherein the radiation passes through the object in the form of a diverging beam, and the different acquire set of projection images for a relative orientations of the object and the beam of radiation define two or more complete trajectories of the beam along the object, the complete trajectories being mutually offset to reduce the degradation of spatial resolution in portions of the generated tomogram due to the divergence of the beam through the object.. .
|Computerized movable laser system for radiographic patient positioning|
A system for radiographic patient positioning includes at least one laser. An orientation sensor is associated with a laser and the orientation sensor produces tilt data indicative of an orientation of a laser.
|Broadband or mid-infrared fiber light sources|
An optical system for use in an imaging procedure includes one or more semiconductor diodes configured to generate an input signal beam with a wavelength shorter than 2.5 microns that is amplified and communicated through optical fiber(s) to a nonlinear element configured to broaden the spectral width to at least 50 nm through a nonlinear effect. A subsystem includes lenses or mirrors to deliver an output beam having a broadened spectrum to an optical coherence tomography apparatus with a sample and reference arm to perform imaging for characterizing the sample.
|Modelling of tof-doi detector arrays|
The invention is directed to several crystal arrangements for time-of-flight (tof) positron emission tomography (pet) with depth of interaction (doi) encoding for high spatial, energy and timing resolution. Additionally, several implementations of the tof-doi pet detector arrays are proposed with related measurements which all show that no timing degradation is visible in the used setup for first photon trigger for digital silicon photo multipliers (dsipms)..
|Supplemental transmission information for attenuation correction in positron emission tomography imaging|
Supplemental transmission information is used in pet imaging with a hybrid pet/mr system. The magnetic field of the mr portion is used to direct positrons from one or more sources outside or inside the pet field of view to within the pet field of view.
|Method and device for correction of movement artifacts in a computed tomography image|
A method for correction of movement artifacts in a computed tomography image that is reconstructed from a plurality of computed tomography projection images is provided. Using all projection images of the plurality of computed tomography projection images, an average position of an examination area of an examination object in the reconstructed image volume is determined by a global optimization method.
|Method for simulating thoracic 4dct|
Four-dimensional (4d) computed tomography (ct) is simulated by first generating a surface mesh from a single thoracic ct scan. Tetrahedralization is applied to the surface mesh to obtain a first volume mesh.
|Large field of view grating interferometers for x-ray phase contrast imaging and ct at high energy|
A device and method of the present disclosure provides large field-of-view talbot-lau phase contrast ct systems up to very high x-ray energy. The device includes microperiodic gratings tilted at glancing incidence and tiled on a single substrate to provide the large field-of-view phase contrast ct system.
|Low impedance interface circuit to maximize bandwidth and provide bias control|
A multichannel application specific integrated circuit (asic) for interfacing with an array of photodetectors in a positron emission tomography (pet) imaging system includes a front end circuit configured to be coupled to the photodetectors and to receive discrete analog signals therefrom. The asic further includes a time discriminating circuit operably coupled to the front end circuit and configured to generate a hit signal based on a combination of the discrete analog signals, and an energy discriminating circuit operably coupled to the front end circuit and configured to generate a summed energy output signal based on each of the discrete analog signals and summed row and column output signals based on each of the discrete analog signals.
|Electric impedance tomography device and method|
An electric impedance tomography device with chest electrodes, a display and a control and analyzing unit to determine a time series of a global ventilation curve from the sequence of reconstructed matrices as a time series of the mean impedance change or of a measured respiration volume, to divide an inspiration or expiration phase into a number of steps of equal volume change, to determine the times corresponding to these steps, to determine the change in local impedance between these times for each image element, the ratio of this local change in impedance to the global equal volume change to form a local sequence of relative impedance changes of the image element as a function of the steps of equal volume change, to determine a scalar indicator characteristic as a function of the steps of equal volume change and to display each image element based on the respective scalar indicator.. .
|Electric impedance tomography device and method|
An eit device with a plurality of electrodes, which can be arranged about the chest of a patient, with a control and analyzing unit for feeding electrode pairs of a set of electrodes to record a voltage or current signal as a measured signal with electrode pairs acting consecutively as the feeding electrode pair to provide a matrix of image elements. A time series of the impedance change from the sequence of reconstructed matrices over at least one breath is obtained and compared to a determined time series of the mean impedance change or a time series of a measured respiration volume, by calculating for each image element a scalar value as an indicator of a deviation.
|Enhanced optical angiography using intensity contrast and phase contrast imaging methods|
The methods described herein are methods to ascertain motion contrast within optical coherence tomography data based upon intensity. The methods of the invention use logarithm operation to convert the multiplicative amplitude or intensity fluctuations (speckle) into the additive variations and recovers the motion contrasts by removing the speckle free signals (static regions) through statistical analysis..
|Optical coherence tomography probe|
A miniature intraoperative probe (30) capable of forward-imaging with optical coherence tomography. The probe includes a housing (130), an actuator (150) supported by the housing, and a single mode (146) fiber supported by the housing and configured to laterally scan light data reflected from a sample..
|Instrument depth tracking for oct-guided procedures|
Systems and methods are provided for tracking a depth of a surgical instrument in an optical coherence tomography (oct) guided surgical procedure. An oct device is configured to image a region of interest to provide oct data.
|Method for generating attenuation correction for a combined magnetic resonance-positron emission tomography device|
A method, a computer program product and a computer readable storage medium are disclosed for generating a global attenuation map used for attenuation correction of positron emission tomography image data sets in a combined magnetic resonance-positron emission tomography device. In an embodiment, during the course of detecting hardware components of the combined magnetic resonance-positron emission tomography device and determining positions of the detected hardware components relative to a patient support, the global attenuation map is generated as a function of the detected hardware components..
|Magnetic resonance imaging and positron emission tomography system|
Provided is a magnetic resonance imaging and positron emission tomography (mri-pet) system. The mri-pet system includes a pet unit and a radiofrequency (rf) coil disposed within a gradient coil assembly..
|Electric impedance tomography device and method|
An eit device with a plurality of electrodes, which can be arranged about the chest of a patient, with a control and analyzing unit for feeding electrode pairs of a set of electrodes to record a voltage or current signal as a measured signal with electrode pairs acting consecutively as the feeding electrode pair to provide a matrix of image elements. A time series of the impedance change from the sequence of reconstructed matrices over at least one inspiration and one expiration is obtained and compared to a determined time series of the mean impedance change or a time series of a measured respiration volume, by calculating for each image element a scalar value as an indicator of a deviation.
|Interactive live segmentation with automatic selection of optimal tomography slice|
An apparatus for automatic selection of optimal tomography slices by executing a number of tentative segmentations using the same interactively provided in-slice seed point on some or all available tomography slices. The appropriate segmentation boundaries are then marked and the slice with the best segmentation goodness value (figure of merit) is presented to the user via a viewer.
|X-ray computed tomography apparatus, medical image processing apparatus, and medical image processing method|
An x-ray computed tomography apparatus includes an x-ray tube, an x-ray detector, a volume data reconstruction unit, a lung field region specifying unit, a discrimination unit, an image generation unit, and a display unit. The volume data reconstruction unit reconstructs first volume data of a chest region of an object based on an output from the x-ray detector.
|Adjustable photon detection systems for multi-slice x-ray computed tomography systems|
An adjustable photon detection system (apds) for multi-slice x-ray ct systems and a multi-slice x-ray ct system using the apds are disclosed; wherein the apds can be adjusted to be aligned to different x-ray source positions; wherein the multi-slice x-ray ct system comprises one or more x-ray sources, and one or more apds; wherein the multi-slice x-ray ct system may also include a detector position calculator for calculating effective detector positions and a detector position corrector for correcting projection data using calculated effective detector positions.. .
|Detector circuits for interferometers|
A detector circuit for a multi-channel interferometer, typically as may be used in an optical coherence tomography device, comprising: a plurality of measurement channels (43) each comprising a measurement detector (31); and a balance channel (44) comprising a balance detector (30), each of the measurement detectors (31) and the balance detector (30) having a light sensitive area and an electrical output configured to output a signal indicative of the intensity of light incident on the light sensitive area, in which each measurement channel (43) is provided with a feedback circuit (40) comprising: a variable gain circuit (35) having an input for the signal from the measurement detector (31) and an output, the variable gain circuit (35) being configured to output at its output the signal received at its input with a variable level of gain; a difference circuit (38) having a first input for the output of the variable gain circuit (35), a second input for the signal from the balance detector (30) and an output, and being configured to output at its output a signal indicative of a difference of the signals at its first and second inputs; and a controller (36) for each variable gain circuit (35) configured to vary the variable level of gain dependent upon a low frequency component of the output of the difference circuit (38).. .
|Systems, method and computer-accessible medium which utilize synthetic aperture(s) for extending depth-of-focus of optical coherence tomography imaging|
An exemplary apparatus can be provided for generating at least one image of a structure. The apparatus can include at least one first arrangement that has a structural configuration with a first aperture and a second aperture.
|Optical coherence tomography control systems and methods|
In part, the invention relates to methods, devices, and systems suitable for controlling a light source. The light source is configured for use in a data collection system such as an optical coherence tomography system.
|Oct swept laser with cavity length compensation|
An optical coherence tomography system utilizes an optical swept laser that has cavity length compensator that changes an optical length of the laser cavity for different optical frequencies to increase the length of the laser cavity for lower optical frequencies. Specifically, a spectral separation between longitudinal cavity modes of the laser cavity is shortened or alternatively lengthened as a passband of a cavity tuning element sweeps through a scanband of the swept optical signal.
|Method and system for optical coherence tomography|
To facilitate a reliable and time-saving examination with straightforward handling, provision is made that a second plane of the object (1) is selected on the basis of the first image (60) that is displayed on the display device (52), wherein the second plane of the object (1) is different from the first plane of the object (1), and a second image (61) is acquired in the region of the selected second plane of the object (1) by means of the optical coherence tomography equipment.. .
|Attenuation-based optic neuropathy detection with three-dimensional optical coherence tomography|
Optical coherence tomography (oct) scan data of a subject is acquired over a region of interest which can include an optic disc or a macula of a retina. Layer boundaries of retinal layers are identified in the oct scan data to facilitate measurements.
|Automated detection of uveitis using optical coherence tomography|
Systems and methods for automatically detecting, classifying and quantifying clumps indicative of inflammation in the eye using optical coherence tomography images are described. Clump detection relies on both intensity and geometric thresholding.
|Method for using lso background radiation as a transmission source using time of flight information|
A method for using lutetium-based scintillator crystals' background beta decay emission in a positron emission tomography (pet) scanner as a transmission scan source for generating attenuation maps is disclosed.. .
|Combined reflectance confocal microscopy-optical coherence tomography system for imaging of biological tissue|
A dual-modality apparatus for imaging of biological tissue includes a reflectance confocal microscopy (rcm) imaging apparatus and an optical coherence tomography (oct) imaging apparatus. A first optical component reflects a first beam of light provided by a rcm imaging apparatus towards a sample and passes a second beam of light provided by an oct imaging apparatus towards the sample, such that the first and second beam of lights share at least a portion of an imaging path..