Abstract: Optical imaging systems and methods are disclosed. The optical imaging system includes an electronic imaging device configured to capture an image of a site and a projector. An optical imaging system includes a projector configured to project a visible representation of the captured image onto the site during surgery. Another optical imaging system includes an optical element capable of aligning an optical axis of the electronic imaging device and the projector on a same optical axis. Also disclosed are methods for displaying an image on to a site. A method includes capturing a fluorescent image of a surgical site; and projecting a visible representation of the captured image onto the surgical site during surgery. Another method includes projecting a visible representation of a captured image of a site onto the site along a same optical axis along which the image is captured.

Abstract: A method and system for calibrating a Time of Flight Positron Emission Tomography (TOF PET) system are provided. The method includes storing acquired scan data from detector pairs. The acquired scan data includes image data and timing information. The method further includes reconstructing images using scan data. The method also includes determining a timing correction for each detector based on intensity distribution histograms of emission sources. The system includes a controller, which is configured to perform the above-mentioned method steps.

Abstract: In an X-ray tube having an anode supported for rotation and an annular target track mounted upon the anode, a cathode spaced apart from the anode projects a beam of electrons onto the target track within a focal spot. The cathode is designed to normalize the impact temperature across the focal spot, as a function of length. In accordance therewith, the cathode comprises a filament and a cathode cup, wherein the filament is disposed to project the electron beam onto the target track to generate X-rays, when a high voltage potential difference is established between the filament and the anode. The filament and the cathode cup are respectively configured to selectively form the electron beam so that the beam provides an electron distribution within the focal point which maintains each point within the focal spot at substantially the same temperature.

Abstract: 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 intensity signal M during a flood procedure and a field of view edge blocks a portion of the edge PMT. The PMT intensity profile changes due to the blocked PMT portion and contains a first point at which the intensity level is N, where N is a fraction of M.

Abstract: Gamma transmission apparatus for use with a gamma camera for reducing transmission imaging period duration, wherein a camera processor is only capable of a maximum number of calculations per second, each photon detected by the camera requires a specific number of calculations and some of the detected photons are not useful for imaging purposes, the apparatus modifying the effective length of an imaging beam to reduce transmission line length thereby eliminating photons which cannot be used for imaging and freeing processor time to process photons useable for imaging thereby increasing imaging speed.

Abstract: An apparatus and method to be used with a gamma camera for identifying and compensating for photomultiplier tube gain drift wherein a photon source is used during a customer quality control flood procedure to direct photons toward the camera and wherein the source is known to generate approximately identical numbers of photons at energies within an acquisition range of energy levels, the acquisition range having a mid-value at energy level Z, the camera is used to generate an upper image using photons having energies above level Z and within the acquisition range and to generate a lower image using photons having energies below level Z and within the acquisition range, the upper and lower images are used to identify PMTs with incorrect gain, identify gain error and then compensate for the error.

Abstract: 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 differently, a spatial coordinate set is determined for each event, each coordinate set is adjusted using a first set of predetermined correction factors calculated to eliminate distortion in events within a first of the energy ranges yielding first corrected coordinate sets corresponding to events within the first energy range and adjusted sets corresponding to events within the second energy range, adjusted sets are further adjusted using a second set of predetermined correction factors calculated to eliminate distortion in the adjusted sets yielding corrected second sets, the first and second sets are then used to generate first and second images, respectively.