Abstract: An apparatus and method for nuclear medical imaging (e.g., SPECT imaging) using cone-beam or multifocal collimators is disclosed. According to the embodiment of the invention, the detector/collimator is tilted in a fore-aft direction, with the tilt angle varying as a function of the orbital position of the detector assembly. The patient pallet may also be moved longitudinally as a function of the tilt angle (i.e., as a function of the orbital position) for optimal image quality.

Abstract: A method and system for compensating truncated transmission projection data used for attenuation correction in a SPECT apparatus. The method and system include generating an initial estimate of a transmission reconstruction without modeling source geometry or detector collimator response and refining the transmission reconstruction by using the initial estimate with a modified model of the source geometry and the collimation geometry.

Abstract: An apparatus and method for nuclear medical imaging (e.g., SPECT imaging) using cone-beam or multifocal collimators is disclosed. According to the embodiment of the invention, the detector/collimator is tilted in a fore-aft direction, with the tilt angle varying as a function of the orbital position of the detector assembly. The patient pallet may also be moved longitudinally as a function of the tilt angle (i.e., as a function of the orbital position) for optimal image quality.

Abstract: Transaxial radionuclide imaging is implemented without relative rotation between detectors and a patient by employing a collimator comprising segments sharing a common central axis, each segment having a plurality of apertures extending therethrough, wherein the segments are angularly displaced from one another about the common central axis. Embodiments include SPECT systems comprising a polygonal detector having a collimator on at least two sides thereof. Embodiments further include collimators comprising six segments, each offset by an angle of 7 to 9°.

Abstract: A method and system for compensating truncated transmission projection data used for attenuation correction in a SPECT apparatus. The method and system include generating an initial estimate of a transmission reconstruction without modeling source geometry or detector collimator response and refining the transmission reconstruction by using the initial estimate with a modified model of the source geometry and the collimation geometry.

Abstract: Transaxial radionuclide imaging is implemented without relative rotation between detectors and a patient by employing a collimator comprising segments sharing a common central axis, each segment having a plurality of apertures extending therethrough, wherein the segments are angularly displaced from one another about the common central axis. Embodiments include SPECT systems comprising a polygonal detector having a collimator on at least two sides thereof. Embodiments further include collimators comprising six segments, each offset by an angle of 7 to 9°.