Abstract: A radiation detection, localization, and identification system uses a searching algorithm to identify hypothetical solutions to Compton scatter data. Model based representations of the physical data collection yield the location of radiation sources when suppressed correlations of source location are identified in processed event data. The system's detector is an array of radiation detectors networked to act as a single detection system. This network has wide area of view and high sensitivity to radiation sources since no collimation is required.

Abstract: A radiation detection, localization, and identification system uses a searching algorithm to identify hypothetical solutions to Compton scatter data. Model based representations of the physical data collection yield the location of radiation sources when suppressed correlations of source location are identified in processed event data. The system's detector is an array of radiation detectors networked to act as a single detection system. This network has wide area of view and high sensitivity to radiation sources since no collimation is required.

Abstract: A method for improving single photon emission computed tomography by controlling acquisition parameters specific to the imaging goals and specific to the individual case under study. Data acquisition is modulated by scanning to adapt to the particular signal to noise characteristics of each object. A preliminary acquisition quickly scans the object of interest. The preliminary data is analyzed to optimize the secondary scan. The secondary scan is then acquired with optimized sampling of the object based on its own particular image characteristics. The system is able to learn, incorporating site specific data into a triaging set.

Abstract: A radiation detection, localization, and identification system uses a searching algorithm to identify geometric correlation of hypothetical solutions to Compton Imaging. Geometric correlation of correct associations of gamma ray energies with each detected event yields the identity and location of radiation sources. The system's detector is an array of radiation detectors networked to act as a single detection system. This network has wide area of view and high sensitivity to radiation sources since no collimation is required.

Abstract: A method for improving single photon emission computed tomography by controlling acquisition parameters specific to the imaging goals and specific to the individual case under study. Data acquisition is modulated by scanning to adapt to the particular signal to noise characteristics of each object. A preliminary acquisition quickly scans the object of interest. The preliminary data is analyzed to optimize the secondary scan. The secondary scan is then acquired with optimized sampling of the object based on its own particular image characteristics. The system is able to learn, incorporating site specific data into a triaging set.

Abstract: A radiation detection, localization, and identification system uses a searching algorithm to identify geometric correlation of hypothetical solutions to Compton Imaging. Geometric correlation of correct associations of gamma ray energies with each detected event yields the identity and location of radiation sources. The system's detector is an array of radiation detectors networked to act as a single detection system. This network has wide area of view and high sensitivity to radiation sources since no collimation is required.

Abstract: A radioisotope identification and localization device having at least one radiation detector with three dimensional event localization that utilizes a spatial correlation of projection vectors arising from Compton scattering of gamma ray emissions. Source identification and location is supplied by a reconstruction that searches for solutions with radioactive material of unknown type. Detection, identification and localization does not require full energy deposition. Identification and location of known or unknown radioactive material somewhere in a large active area of interrogation is achieved.

Abstract: A tomographic imaging system which images ionizing radiation such as gamma rays or x rays and which: 1) can produce tomographic images without requiring an orbiting motion of the detector(s) or collimator(s) around the object of interest, 2) produces smaller tomographic systems with enhanced system mobility, and 3) is capable of observing the object of interest from sufficiently many directions to allow multiple time-sequenced tomographic images to be produced. The system consists of a plurality of detector modules which are distributed about or around the object of interest and which fully or partially encircle it. The detector modules are positioned close to the object of interest thereby improving spatial resolution and image quality. The plurality of detectors view a portion of the patient or object of interest simultaneously from a plurality of positions.

Abstract: An articulating detector array for gamma cameras is disclosed which is adaptable to perform different imaging techniques in a single apparatus. The articulating detector array is adapted to detect incident gamma radiation from diverse directions as well as Compton scattering thereof without the need of a collimator, as so has improved gamma ray detection efficiency. The detector array includes radiation detectors in an array and movable to a plurality of positions, in which each radiation detector is responsive to gamma radiation from a target for generating detection signals for use in tomographic imaging of the source. The detector array includes articulating support structures for mounting the detectors to the base and for moving the detectors from a first position to a second position.

Abstract: The long axis of the left ventricle is automatically identified by identifying, and correlating, local minima and maxima in images of slices of the left ventricle. Initially, the left ventricle is identified within a representative transverse slice of the left ventricle. The centerline of this slice is automatically computed and used as a reorientation axis, along which another (sagittal) slice of the left ventricle is reconstructed. The centerline of this sagittal slice is automatically computed, and is the long axis of the left ventricle. The accuracy of this identification is confirmed by reconstructing oblique transverse slices of the left ventricle and verifying that their centers are coincident.

Abstract: Light emitting diodes (LEDs) at fixed locations are placed at the entrance face of the scintillator within the detector head of a scintillation camera system. By energizing the LEDs, surrogate scintillation events may be generated and processed by the scintillation camera system. Information thus acquired can be used to maintain the photodetectors in a well-tuned state, to identify baseline shifts in the preamplifier channels and to determine system deadtime.

Abstract: A multi-isotope study is carried out using a plurality of imaging agents which are imaged simultaneously. The information obtained is weighted using as many energy weighting functions as there are isotopes. The weighting reduces "crosstalk" between each of the single-isotope images which are produced as a result of the study. This produces improved results in, for example, dual-isotope (Tc-99m and Tl-201) myocardial perfusion studies.

Abstract: Upon the detection of a scintillation event at an event pixel, a plurality of associated pixels are identified. Weights are assigned to the event pixel and to all of the associated pixels in such a manner as to attribute the event over an area in a statistically accurate manner. A current sum of all weights which have been previously assigned to each pixel is stored. Unblank signals are generated, based upon this current sum, and the current sum is updated to account for the number of unblank signals so generated.