199 results about "Detector head" patented technology

A system for medical imaging and a patient support system for medical diagnosis are provided. The system includes a gantry mounted on the base. The gantry has an annular support. A detector head is fixed to the inner surface of the annular support. The annular support rotates along an axis of the inner space, and is prevented from moving in horizontal and vertical direction and moving angularly. The patient support system has a patient bed system having a plurality of configurations. The contact surface of the patient has a couch back support, a thigh support and a leg support. A controller is provided for angular movements of the supports, and for vertical / horizontal movements of the supports.

Disclosed is a compact, microprocessor-controlled instrument for fluorometric assays in liquid samples, the instrument having a floating stage with docking bay for receiving a microfluidic cartridge and a scanning detector head with on-board embedded microprocessor operated under control of a ODAP daemon resident in the detector head for controlling source LEDs, emission signal amplification and filtering in an isolated, low noise, high-gain environment within the detector head. Multiple optical channels may be incorporated in the scanning head. In a preferred configuration, the assay is validated using dual channel optics for monitoring a first fluorophore associated with a target analyte and a second fluorophore associated with a control. Applications include molecular biological assays based on PCR amplification of target nucleic acids and fluorometric assays in general, many of which require temperature control during detection.

An infrared ear thermometer includes a detector head housing, a heat sink, a recess formed in the heat sink, a thermopile sensor mounted within the recess, a thermistor, and temperature determination circuitry. The recess defines an aperture that limits the field of view of the thermopile sensor. The thermal capacities and conductivities of the heat sink and the thermopile sensor are selected so that the output signal of the thermopile sensor stabilizes during a temperature measurement. A method of determining temperature using the ear thermometer takes successive measurements, stores the measurements in a moving time window, averages the measurements in the moving window, determines whether the average has stabilized, and outputs an average temperature. A method of calculating a subject's temperature determines the temperature of a cold junction of the thermopile, looks up a bias and slope of the thermopile based upon the temperature of the cold junction, measures the output of the thermopile, and calculates the subject's temperature based upon a linear relationship between the output and the subject's temperature. The linear relationship is defined by the bias and the slope.

Tomography by emission of positrons (pet) system dedicated to examinations of human body parts such as the breast, axilla, head, neck, liver, heart, lungs, prostate region and other body extremities which is composed of at least two detecting plates (detector heads) with dimensions that are optimized for the breast, axilla region, brain and prostrate region or other extremities; motorized mechanical means to allow the movement of the plates under manual or computer control, making it possible to collect data in several orientations as needed for tomographic image reconstruction; an electronics system composed by a front-end electronics system, located physically on the detector heads, and a trigger and data acquisition system located off-detector in an electronic crate; a data acquisition and control software; and an image reconstruction and analysis software that allows reconstructing, visualizing and analyzing the data produced during the examination.

Disclosed is a microassay testing system, including a microfluidic cartridge and a compact microprocessor-controlled instrument for fluorometric assays in liquid samples, the cartridge having integrated process controls and positive and negative assay controls. The instrument has a scanning detector head incorporating multiple optical channels. In a preferred configuration, the assay is validated using dual channel optics for monitoring a first fluorophore associated with a target analyte and a second fluorophore associated with a process control. Integrated positive and negative assay controls provide enhanced assay validation capabilities and facilitate analysis of test results. Applications include molecular biological assays based on PCR amplification of target nucleic acids and fluorometric assays in general.

An N-M tomography system comprising: a carrier for the subject of an examination procedure; a plurality of detector heads; a carrier for the detector heads; and a detector positioning arrangement operable to position the detector heads during performance of a scan without interference or collision between adjacent detector heads to establish a variable bore size and configuration for the examination. Additionally, collimated detectors providing variable spatial resolution for SPECT imaging and which can also be used for PET imaging, whereby one set of detectors can be selectably used for either modality, or for both simultaneously.

A radionuclide scanner in which multiple detectors are equipped with collimators such that a circular rotation of the detector around a target provides the movement needed for collimator sampling. This collimator sampling is accomplished through strategic placement of the detector heads relative to each other such that for any given projection, a complete imaging of the projection is acquired by summing the complementary contributions of the multiple detector heads at the projection under consideration.

A radiation detection camera head having a focal-plane array of pixelated detectors having constant pitch between pixels over the whole of the camera head, while using detector modules having normal production tolerances, and which can nevertheless be readily removed and replaced in the detector array by means of predetermined gaps between adjacent detector modules. The pixels on the side walls of the detector modules have reduced size to maintain constant pitch over the array in spite of production variation between modules. The reduction in sensitivity due to this reduced size is compensated for by the addition of insulated conductive bands on the side walls. The head collimator is such that the septa fall between pixels and between modules, such that head sensitivity is maintained at its optimum value.

A system and method provide for more accurate SPECT / CT image registration. CT data is utilized to establish a global spatial coordinate system of a common test phantom. The common test phantom is then used to obtain a set of point source nuclear images. Three-dimensional CT point source data is mapped to a two-dimensional image plane of corresponding point source data, to obtain a pair of intersecting projection cones that are used to obtain a set of detector head position correction parameters to correct detector head positioning in the CT coordinate system when obtaining SPECT projection images of the same object.

An image reconstruction method comprising accepting coincidence datat from either a data file or in real time from a pair of detector heads, culling event data that is outside a desired energy range, optionally saving the desired data for each detector position or for each pair of detector pixels on the two detector heads, and then reconstructing the image either by backprojection image reconstruction or by iterative image reconstruction. In the backprojection image reconstruction mode, rays are traced between centers of lines of response (LOR's), counts are then either allocated by nearest pixel interpolation or allocated by an overlap method and then corrected for geometric effects and attenuation and the data file updated. If the iterative image reconstruction option is selected, one implementation is to compute a grid Siddon retracing, and to perform maximum likelihood expectation maiximization (MLEM) computed by either: a) tracing parallel rays between subpixels on opposite detector heads; or b) tracing rays between randomized endpoint locations on opposite detector heads.

A system and method for performing quantitative lesion analysis in molecular breast imaging (MBI) using the opposing images of a slightly compressed breast that are obtained from the dual-head gamma camera. The method uses the shape of the pixel intensity profiles through each tumor to determine tumor diameter. Also, the method uses a thickness of the compressed breast and the attenuation of gamma rays in soft tissue to determine the depth of the tumor from the collimator face of the detector head. Further still, the method uses the measured tumor diameter and measurements of counts in the tumor and background breast region to determine relative radiotracer uptake or tumor-to-background ratio (T / B ratio).

Methods and systems for controlling movement of detectors having multiple detector heads are provided. One system includes a gantry, a patient support structure supporting a patient table thereon, and a plurality of detector units. At least some of the detector units are rotatable to position the detector units at different angles relative to the patient table. The imaging system further includes a detector position controller configured to control the position of the rotatable detector units, wherein at least some of the rotatable detector units positioned adjacent to each other have an angle of rotation to allow movement of the rotatable detector units a distance greater than a gap between adjacent rotatable detector units The detector position controller is configured to calculate at least one of field of view avoidance information or collision avoidance information to determine an amount of movement for one or more of the rotatable detector units.

A detection method for measuring lift guide rail perpendicularity and an apparatus for practicing the method. The detection method includes the following steps: selecting several monitoring points on a working surface of the lift under testing, measuring seriatim the position coordinates of each monitoring point in the longitudinal direction of the guide rail and the distance between two adjacent monitoring points, measuring seriatim the included angle between the line connecting the two adjacent monitoring points and the plumb line (or the horizontal line), plotting a graphic chart of the perpendicularity error data to obtain the perpendicularity curve for the lift guide rail. The apparatus includes an instrument frame, several detector heads, a displacement sensor, an inclination sensor, a microprocessor and a power supply unit installed on the instrument frame. The advantages of the present invention are: the detected data are picked up directly by the sensors and inputted into the microprocessor, and analyzed and outputted by the microprocessor, so that automation and intellectualization of lift guide rail perpendicularity detection are achieved.

The invention discloses an anti-sniper laser active detection system, which comprises an anti-sniper detector head and a portable industrial personal computer and is characterized in that the anti-sniper detector head is used for emitting infrared detection laser and glaring laser, receiving reflected laser echo signals, obtaining target images, measuring target distance and positioning the coordinates of a detected target; and the portable industrial personal computer is used for controlling the emission of the infrared detection laser and the glaring laser, carrying out the automatic identification, processing and storage on image signals fed back by the anti-sniper detector head, and supplying power for the system. The invention has simple structure and is convenient to carry. The system has large detection visual angle, automatically identifies suspicious target, and gives an alarm for prompting when finding the target by adopting an image processing method; the system can rapidlyposition and look into the position and the distance of an optical lend target, provide day and night amplified observation for an observation field for recording and shooting, and have an recognition rate far higher than the recognition rate of a working method with a unit detector; and the system further can carry out the coordinate positioning and the glaring suppression on the target. The invention provides the system and the method with powerful function and better practicability for various military necessities, such as the protection of very important person, field operations of anti-sniper army, anti-sniper operation and the like.

A method and system for automatically identifying and tracking a ROI over all planar acquisition view angles of a nuclear imaging system, such as a gamma camera used for SPECT or planar imaging. Temporal intensity variation in emission projection imaging is measured to identify a region of interest (ROI) such as the myocardium. The method automatically tracks the location of the ROI over different planar view angles and adapts detector head orbit and positioning to bring the ROI within a predefined preferred area or so-called “sweet spot” within the FOV of a collimator attached to the front of a scintillation detector surface. After initial positioning of the detector head by the user, the system automatically tracks the ROI location as the detector head(s) rotate about the patient and re-position the detector head(s) appropriately to maintain the ROI within the optimal collimation area of the detector FOV.

Systems and methods for planar imaging with detectors having moving heads are provided. One system includes a gantry having an opening therethrough, a patient table movable through the opening of the gantry along an examination axis, and a plurality of detector units mounted to the gantry and aligned in a row transverse to the examination axis. The plurality of detector units are spaced apart from each other, wherein the spacing forms gaps between adjacent detector units. The plurality of detector units are configured to acquire Single Photon Emission Computed Tomography (SPECT) data. The system further includes a controller configured to control movement of the patient table and the plurality of detector units to acquire two-dimensional (2D) SPECT data, wherein the plurality of detector units remain in a fixed relative orientation with respect to each other when acquiring the 2D SPECT data and move together to acquire the 2D SPECT data.

A glucose sensor for measurement of glucose in subcutaneous tissue, the sensor comprising: a probe for subcutaneous insertion, the probe containing an indicator system comprising a receptor for selectively binding to glucose and a fluorophore associated with said receptor, wherein the fluorophore has a fluorescence lifetime of less than 100 ns; a detector head which is optically connected to the probe and which is for location outside the body; a light source; and a detector arranged to receive fluorescent light emitted from the indicator system, wherein the light source and detector are optionally located within the detector head; wherein the sensor is arranged to measure glucose concentration in subcutaneous tissue by monitoring the fluorescence lifetime of the fluorophore.

An imaging system is provided that includes a gantry, plural radiation detector head assemblies, a cooling unit, and a manifold. The radiation detector head assemblies are disposed about a bore of the gantry. Each radiation detector head assembly includes a detector housing and a rotor assembly. The rotor assembly is configured to be rotated about an axis. The rotor assembly includes a detector unit that in turn includes an absorption member and associated processing circuitry. The cooling unit is mounted to the gantry and is configured to provide an output flow of air at a controlled temperature. The manifold is coupled to the cooling unit and the plural radiation detector head assemblies, and places the cooling unit and radiation detector head assemblies in fluid communication with each other. The output flow of air from the cooling unit is delivered to the plural radiation detector head assemblies.

In an imaging method, mark positions are defined for one or more detector heads (10, 12) at one or more marked angular orientations (θA, θB). The mark positions for at least one marked angular orientation (θB) include a tangential offset of at least one detector head. Imaging data are acquired using the one or more detector heads following a conformal trajectory passing through the defined mark positions. The acquired imaging data are reconstructed into a reconstructed image.

A system and method for molecular breast imaging (MBI) provides enhanced tumor analysis and, optionally, a real-time biopsy guidance. The system includes a detector head including a gamma ray detector and a multisegment collimator in a collimator frame. The collimator contains multiple collimation sections that have respectively different collimating characteristic and that are individually repositionable with respect to the detector. An image of the tissue acquired with the system may include spatially separate image portions containing image information about the same portion of the imaged tissue. A system of mounting the multisegment collimator in the detector head includes a collimator tray that is laterally moveable within the frame and / or slidable in and out of the frame.

A system and method for molecular breast imaging (MBI) provides enhanced tumor analysis and, optionally, a real-time biopsy guidance. The system includes a detector head including a gamma ray detector and a collimator. The collimator include multiple collimation sections having respectively different spatially-oriented structures. In addition or alternatively, the multiple collimating section have respectively different collimation characteristics. An image of the tissue acquired with the system may include spatially separate image portions containing image information about the same portion of the imaged tissue. A system is optionally configured to acquire updatable images to provide real-time feedback about the biopsy procedure.

Disclosed is a displacement measuring apparatus that includes a composite scale having a magnetic pattern and a diffraction grating each aligned in a direction of measuring axis, and a detector head moving in a direction of measuring axis relative to the composite scale. The detector head has a magnetic detection unit detecting a magnetic field exerted by the magnetic pattern to generate first reproduced signals, a light source irradiating the diffraction grating with light, and an optical detection unit detecting the light diffracted by the diffraction grating to generate second reproduced signals. In composite scale, the magnetic pattern and the diffraction grating are arranged such that a pitch of the first reproduced signals is larger than that of the second reproduced signals.

Workpiece rotators are constructed for decoration registration control in spaced apart decoration stations for bottles rotatably supported by carriers of an endless chain conveyor. A screen drive at each decorating station linearly reciprocates a decorating screen to decorate the bottle. A squeegee is positioned to maintain line contact between the decorating screen and a bottle for applying decoration during each screening cycle. The workpiece rotator is coupled by a drive controller to the screen drive to rotate a bottle synchronously with linear travel of the decorating screen. The drive controller uncouples the workpiece rotator from the screen drive at times other than the application of decoration to a bottle. In one embodiment electronic gearing is formed by a servo motor controlled by a scale moved by a screen drive along a detector head which provides an electrical signal used in a control system to maintain proper position of the servo motor during decoration, to re-home the rotator after decoration and to establish a predetermined power start-up position for the rotator. The vertical position of the rotator is adjusted for coaxial alignment between the rotational axes of the rotator and the workpiece. The drive for the rotator may include a one-way clutch or an electric clutch and brake driven by a pinion controlled by a rack in response to reciprocation of the screen drive.

Methods and apparatus for imaging with detectors having moving heads are provided. One apparatus includes a gantry and a plurality of detector units mounted to the gantry. At least some of the plurality of detector units are movable relative to the gantry to position one or more of the detector units with respect to a subject. The detector units are movable along parallel axes with respect to each other.

An imaging system is provided including a gantry, a detector unit mounted to the gantry, at least one processing unit, and a controller. The at least one processing unit is configured to obtain object information corresponding to an object, and to automatically determine at least one first portion of the object and at least one second portion of the object. The controller is configured to control a rotational movement of the detector unit. The detector unit is rotatable at a sweep rate over a range of view of the object to be imaged, and the controller is configured to rotate the detector unit at an uneven sweep rate. The uneven sweep rate varies during the rotation from the, wherein a larger amount of scanning information is obtained for the at least one first portion than for the at least one second portion.