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7391027 |
3D image reconstructing method for a positron CT apparatus, and positron CT apparatus
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...
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7323689 |
Attenuation correction in nuclear medicine studies by simultaneous transmission and emission data measurement and estimation of emission-to-transmission crosstalk
Attenuation correction in SPECT studies such as cardiac function imaging is carried out using an iterative statistically-based transmission projection reconstruction algorithm that is capable of...
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7262416 |
Gamma camera with dynamic threshold
A method of locating an event with a gamma camera ( 12 ) of an emission computed tomography (ECT) scanner ( 10 ) is provided. The gamma camera ( 12 ) includes a matrix of sensors ( 22 ) situated to...
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7132663 |
Methods and apparatus for real-time error correction
Methods and apparatus for correcting for at least one of deadtime losses and random coincidences in a positron emission tomography (PET) medical imaging device having a plurality of detectors at...
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7081626 |
Apparatus and method for temperature correction and expanded count rate of inorganic scintillation detectors
The present invention includes an apparatus and corresponding method for temperature correction and count rate expansion of inorganic scintillation detectors. A temperature sensor is attached to an...
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6901337 |
Method and apparatus for measuring signal pulse energy
The energy E of a signal pulse P inputted to an energy measurement apparatus 1 for measurement, and corresponding to the total integrated intensity, is calculated in an energy calculation unit ...
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6888139 |
Electron microscope
The present invention provides an analysis of displacement by calculating the phase variance image P′ (k, l) between Fourier transformed images of paired images S 1 (n, m) and S 2 (n, m) to...
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6762412 |
Optical apparatus, exposure apparatus using the same, and gas introduction method
The optical apparatus of the present invention comprises; an optical member such as a lens; a casing containing the optical member; a gas supply device that supplies gas at a predetermined flow...
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6723993 |
Event localization and fall-off correction by distance-dependent weighting
A nuclear camera system includes a detector ( 12 ) for receiving radiation from a subject ( 14 ) in an exam region ( 16 ). The detector ( 12 ) includes a scintillation crystal ( 20 ) that converts...
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6694172 |
Fault-tolerant detector for gamma ray imaging
A nuclear imaging apparatus includes a radiation detector comprising an array ( 18 ) of solid state detector elements ( 22 ) responsive to incident gamma radiation by emitting a current spike. A...
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6693291 |
Device and system for improved imaging in nuclear medicine and mammography
A method and apparatus for detecting radiation including x-ray, gamma ray, and particle radiation for radiographic imaging, and nuclear medicine and x-ray mammography in particular, and material...
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6664542 |
Gamma camera error correction using multiple point sources
A gamma camera system and method are described which use multiple point sources to detect inaccuracies in detector translational and rotational alignment. In practice of the method of the preferred...
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6576907 |
High count rate gamma camera system
A gamma camera system that increases the count rate by counting events that time-wise appear to be pile-up events but are spatially separated.
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6570156 |
Autoadjusting electron microscope
An autoadjusting electron microscope in which an image processor derives a third image constituting an analysis image from first and second images of a specimen by Fourier-transforming the first...
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6559450 |
Gamma camera with two sequential correction maps
A method of correcting errors in imaging data in a Gamma Camera including determining a first correction map based on one or both of (1) calculated corrections and (2) a first data acquisition,...
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6525323 |
Method and apparatus for improved estimation of characteristics of pulses detected by a nuclear camera
A nuclear medicine imaging device includes a radiation camera ( 10 ) including a plurality of photo multiplier tubes ( 28 ). Each photo multiplier tube ( 28 ) is configured with an analog to...
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6472667 |
Data reduction architecture for nuclear medicine imagers
A subject ( 10 ) is disposed adjacent a detector array ( 18 ) for the purposes of nuclear imaging. The subject ( 10 ) is injected with a radioactive isotope ( 14 ) and γ-ray emissions indicative...
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6452183 |
Nuclear medical diagnosis apparatus and image reconstruction method therefor
A nuclear medical diagnosis apparatus comprises a detector configured to detect gamma rays emitted from radioisotopes administered to a target object, a mechanism configured to move the detector...
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6403961 |
Image generation method
An image generation method in a scintillation camera relates to a scintillation camera having a collimator for collimating gamma rays, a scintillation crystal for generating a light scintillation...
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6392235 |
Coded-aperture system for planar imaging of volumetric sources
A coded aperture is placed in proximity of a patient's body and a 2D coded image is acquired in conventional manner. The basic data-acquisition geometry is similar to that used in various...
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6388258 |
Solid state gamma camera
A gamma camera for imaging radiation emitted from or transmitted by an object including a gamma camera head having a front input surface which produces signals, when a photon associated with the...
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6369389 |
Real-time compton scatter correction
A method of reducing artifacts caused by generation of unwanted photons by scattering (e.g., Compton scattered photons) in which a detected event is spatially convoluted with a spatial filter...
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6339223 |
Apparatus for truncation correction of transmission CT and nuclear medical diagnostic apparatus using the same
SPECT data is collected to produce a SPECT image and transmission CT projection data is collected to produce a transmission CT image. The contours of the body of a subject under examination is...
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6294788 |
Randoms correction in positron imaging
In positron emission imaging, coincident gamma ray pairs are acquired and processed to generate an image. Random gamma ray pairs in the acquired coincidence data degrade the quality of the...
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6281504 |
Diagnostic apparatus for nuclear medicine
A diagnostic apparatus for nuclear medicine capable of performing an operation of counting gamma rays for a TCT simultaneously with an operation of counting gamma rays for an SPECT has a SPECT...
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6275747 |
Microcomputer and its access speed control method
A microcomputer usable for a long period of time even when disposed in a high dose radiation-exposed environment, and its access speed control method are provided. According to the microcomputer...
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6242743 |
Non-orbiting tomographic imaging system
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...
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6239438 |
Dual acquisition imaging method and apparatus
A method and apparatus for simultaneously acquiring imaging data at two different resolutions, a high resolution data set using for forming a diagnostic image and a plurality of low resolution data...
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6175118 |
Gamma camera
According to the present invention, sub-windows using a TEW technique are centered to energies corresponding to 1/n and 1/m of maximal photon number in a standard energy spectrum without any...
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6160259 |
Channel-specific control of pulse integration in a gamma camera system in response to pulse pile-up
A method and apparatus for selectively integrating PMT channel signals in a gamma camera system are described. A trigger word is decoded to determine which of multiple PMT channels are affected by...
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6080984 |
Semiconductor gamma-ray camera and medical imaging system
A high-energy photon imaging system includes an imaging head, a signal processor, a data acquisition system and an image processing computer. The imaging head includes a detector that includes a...
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6051837 |
Gamma camera stabilizer
A method for identifying PMT drift in an edge PMT of a gamma camera, where said gamma camera includes a plurality of PMTs arranged in an array. The central point of said array generates an...
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5986279 |
Method of recording and reading a radiation image of an elongate body
A radiation image is recorded on a plurality of photostimulable phosphor screens of a size that is smaller than the size of the elongate body. The screens are exposed to a radiation image of a grid...
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5936248 |
Multiple energy scintillation camera spatial correction method and apparatus
A method for use with a scintillation camera which detects radiation events having energies within two different energy ranges and distorts spatial coordinates of detected events in the two ranges...
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5903008 |
Scatter correction methods and systems in single photon emission computed tomography
An emission tomographic system for imaging an object of interest is described. The system, in one form, includes a gantry and a patient table. A detector including a collimator is secured to the...
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5884234 |
Method for pulse shape regulation and discrimination in a nuclear spectroscopy system
The present invention is based on a digital pulse sampling and detection technique which samples a nuclear pulse train at a constant frequency asynchronously with the actual pulses, which occur at...
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5847395 |
Adaptive baseline correction for gamma camera
Signal processing circuitry for use in medical imaging includes a flash analog-to-digital converter (FADC) for digitizing signals from a sensor; a memory for storing a plurality of digitized...
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5838010 |
Spatial resolution improvement for gamma camera
A method for improving single photo emission computed tomography accuracy by determining photon impact locations within a detector field using PMT intensity signals from all PMTs in an array. The...
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5834779 |
Method and apparatus for performing correction for random coincidences in a medical imaging system
A method of correcting coincidence data for random coincidences in a nuclear medicine imaging system is provided. The system includes a pair of detectors that are rotatable about an axis, with an...
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5793045 |
Nuclear imaging using variable weighting
A camera for use in coincidence imaging includes detectors (10a, 10b) disposed about an examination region (12). Coincidence logic (14) determines whether gamma rays are detected by each of the...
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5705819 |
Emission CT apparatus
An emission CT apparatus for detecting, in positions around an examinee, radiation from radioactive nuclides introduced into the examinee and having accumulated in a site of concern, in order to...
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5689116 |
Systems and methods for calibrating a gamma camera
Methods and systems for calibrating a digital gamma camera using a hole phantom are described. In one embodiment, the method includes the steps of performing offset adjustments and gain...
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5689115 |
Advanced nuclear medicine system
A method of acquiring an analog electrical pulse signal caused by a radiation event impinging on a detector crystal and viewed by a plurality of detector units. An image is formed based on a...
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5648659 |
Method for the acquisition, in nuclear medicine, of a scatter image
To acquire both a scatter image and an emission image in nuclear medicine, it is chosen to detect the emission image by validating the radioactive events that occur in the nominal range of the...
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5646408 |
Software and event driven baseline correction
A correction system for correcting and maintaining the baseline offset signal value of a PMT channel of a scintillation detector at a predetermined value. The correction system utilizes an event...
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5633500 |
Split window scatter correction
A method of scatter correction for use with gamma cameras includes the steps of detecting and producing a first count value indicative of gamma radiation falling within a first energy range...
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5633499 |
Scatter elimination technique and apparatus in radionuclide emission and transmission imaging in a nuclear camera
Scatter errors are eliminated from a gamma camera image on a spatially dependent basis. A global scatter curve is obtained and normalized for each local area. Based on this local scatter curve and...
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5606166 |
Method for correcting the uniformity of a gamma camera
A method for the correction of uniformity of a gamma camera comprising a detector giving, for each pixel i,j having coordinates x i , y i , a number n ij representing the number of scintillations...
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5576546 |
Depth-of-interaction normalization of signals for improved positioning, and energy resolution in scintillation camera
In addition to the traditionally calculated photodetector sum signal or energy value, and X, Y position values, the second order moment of the photodetector signals is calculated from photodetector...
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5561297 |
Scatter correcting gamma-ray camera
A method of obtaining scatter-corrected images from a nuclear imaging apparatus such as a gamma-ray camera involves the use of a calibration step which measures the energy spectrum response of the...
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