Abstract: A cardiac phantom is provided for simulating a dynamic cardiac ventricle. The phantom comprises two concentrically-disposed, fluid-tight, flexible membranes defining a closed space between the walls of the membranes. A pump is operatively connected to the inner membrane for reciprocally delivering a volume of fluid to the inner membrane to inflate and deflate both membranes in simulating systole and diastole of a heart. A medium is disposed within the closed space defined between the walls of the membranes for maintaining a uniform distance between the walls of the membranes during inflation and deflation. The phantom is provided for evaluation of medical imaging systems. A method, computer system and a computer-readable medium are also provided for controlling the phantom.

Abstract: A cardiac phantom is provided for simulating a dynamic cardiac ventricle. The phantom comprises two concentrically-disposed, fluid-tight, flexible membranes defining a closed space between the walls of the membranes. A pump is operatively connected to the inner membrane for reciprocally delivering a volume of fluid to the inner membrane to inflate and deflate both membranes in simulating systole and diastole of a heart. A medium is disposed within the closed space defined between the walls of the membranes for maintaining a uniform distance between the walls of the membranes during inflation and deflation. The phantom is provided for evaluation of medical imaging systems. A method, computer system and a computer-readable medium are also provided for controlling the phantom.

Abstract: A cardiac phantom is provided for simulating a dynamic cardiac ventricle. The phantom comprises two concentrically-disposed, fluid-tight, flexible membranes defining a closed space between the walls of the membranes. A pump is operatively connected to the inner membrane for reciprocally delivering a volume of fluid to the inner membrane to inflate and deflate both membranes in simulating systole and diastole of a heart. A medium is disposed within the closed space defined between the walls of the membranes for maintaining a uniform distance between the walls of the membranes during inflation and deflation. The phantom is provided for evaluation of medical imaging systems. A method, computer system and a computer-readable medium are also provided for controlling the phantom.

Abstract: A cardiac phantom is provided for simulating a dynamic cardiac ventricle. The phantom comprises two concentrically-disposed, fluid-tight, flexible membranes defining a closed space between the walls of the membranes. A pump is operatively connected to the inner membrane for reciprocally delivering a volume of fluid to the inner membrane to inflate and deflate both membranes in simulating systole and diastole of a heart. A medium is disposed within the closed space defined between the walls of the membranes for maintaining a uniform distance between the walls of the membranes during inflation and deflation. The phantom is provided for evaluation of medical imaging systems. A method, computer system and a computer-readable medium are also provided for controlling the phantom.

Abstract: A cardiac phantom is provided for simulating a dynamic cardiac ventricle. The phantom comprises two concentrically-disposed, fluid-tight, flexible membranes defining a closed space between the walls of the membranes. A pump is operatively connected to the inner membrane for reciprocally delivering a volume of fluid to the inner membrane to inflate and deflate both membranes in simulating systole and diastole of a heart. A medium is disposed within the closed space defined between the walls of the membranes for maintaining a uniform distance between the walls of the membranes during inflation and deflation. The phantom is provided for evaluation of medical imaging systems. A method, computer system and a computer-readable medium are also provided for controlling the phantom.

Abstract: Disclosed is a method and apparatus for single photon emission computed tomography of a test region having a plurality of projectional views utilizing a radiation source opposite said test region from a radiation detector, comprising detecting emission radiation from a first projectional view of a test region, irradiating the test region to transmit radiation through the test region, and detecting both emission and transmission radiation from the first projectional view of the test region. The emission detection, irradiation and emission and transmission steps are then repeated for a second projectional view. This emission and transmission data may then be used to produce compensated emission data for the test region.

Abstract: A phantom for testing nuclear imaging instruments, such as are used in nuclear medicine, includes a hollow, cylindrical case with a removable carrier. The carrier contains several sets of straight, parallel rods which are of uniform cross section throughout and which have equal orthogonal dimensions in a plane perpendicular to rod alignment. The rods are arranged in an array with uniform spacing therebetween in each set. Several spheres are mounted on posts which screw into the base of the case so that the spheres are oriented in a plane perpendicular to the rod alignment. A pair of capillary tubes are secured to closure caps which are threadably engageable in access openings in the top of the case. The capillary tubes are insertable into circular, laterally stabilizing wells in the bottom of the case.

Abstract: A collimator is provided for a scintillation camera system in which a detector precesses in an orbit about a patient. The collimator is designed to have high resolution and lower sensitivity with respect to radiation traveling in paths laying wholly within planes perpendicular to the cranial-caudal axis of the patient. The collimator has high sensitivity and lower resolution to radiation traveling in otherplanes. Variances in resolution and sensitivity are achieved by altering the length, spacing or thickness of the septa of the collimator.

Abstract: A scintillation camera system for use in positron imaging in which radiation scattered in an object under study is screened and Compton events, as well as primary radiation, are imaged.