The development of low profile gamma-ray detectors has encouraged the production of small field of view (SFOV) hand-held imaging devices for use at the patient bedside and in operating theatres. Early development of these SFOV cameras was focussed on a single modality-gamma ray imaging. Recently, a hybrid system-gamma plus optical imaging-has been developed. This combination of optical and gamm...

Abstract We study sky maps and light curves of gamma-ray emission from neutron stars in compact binaries, isolation. briefly review some models, reproduce a standard isolated pulsar the Separatrix Layer model. consider pulsars with several variations dipole magnetic field, including superpositions, predict their emission. Our results provide new heuristics on what can cannot be inferred about f...

Several groups have reported the development of dual modality Gamma camera/optical imagers, which are useful tools for investigating biological processes in experimental animals. While previously reported dual modality imaging instrumentation usually employed a separated gamma camera and optical imager, we designed a detector using a position sensitive photomultiplier tube (PSPMT) that is capab...

A handheld, high-resolution small field of view (SFOV) pinhole gamma camera has been characterised using a new set of protocols adapted from standards previously developed for large field of view (LFOV) systems. Parameters investigated include intrinsic and extrinsic spatial resolution, spatial linearity, uniformity, sensitivity, count rate capability and energy resolution. Camera characteristi...

pulse-width modulation records up to 28,000 Hz from an Anger camera without spatial or tern poral distortion and with less than 1 % data loss. Recording and playback may be made at any of five tape speeds: 3%, 71,4, 15, 30, 60 ips, each accommodating a different maximal count ing rate. Since only two of four recording tracks are used, the others are available for other in put. The replayed data...

Emission computed tomography (emission CT) and conventional planar gamma-camera imaging of the liver were compared in 242 patients with suspected metastatic spread to liver. Concordant data were obtained in 171 patients (71%). Single large lesions, multiple small lesions, and diffuse disease were accurately defined with this new radionuclide tomographic technique. The smallest lesion detected b...

A framework is developed for the design and analysis of single-viewpoint catadioptric cameras that use two or more mirrors. The use of multiple mirrors permits folding of the optics which leads to more compact camera designs than ones that use a single mirror. A dictionary of camera designs that use two conic mirrors is presented. We show that any folded system that uses conic mirrors has a geo...

The methods to measure the polarization of x-rays from highly charged heavy ions with a significantly higher accuracy than existing technology is needed explore relativistic and quantum electrodynamics (QED) effects including Breit interaction. We developed Electron Beam Ion Trap Compton Camera (EBIT-CC), new polarimeter pixelated multi-layer silicon cadmium telluride counters. EBIT-CC detects ...