Anger (1 ) , a number of papers describing both the physical characteristics of the instrument and its ap plications have been published (2—12) . However, the performance of the gamma camera has usually been discussed in terms of the parameters fundamental to a conventional scanner, and insufficient emphasis has been placed on characteristics that are unique to the camera. It is, of course, n...

Acquisition of 3-D anatomical structure in minimally invasive surgery is an important step towards intra-operative guidance. In this context, the rst prototype of a Time-of-Flight/RGB endoscope was engineered for simultaneous range and color data acquisition. Intrinsic and stereo camera calibration are essential to achieve an intuitive visualization of colored surfaces. Due to the early prototy...

PURPOSE Hand-held gamma-probes are used for the identification of the sentinel node location during intra-operative radio-guided surgeries. Various gamma-probes, which use different detectors, collimation and electronics, are available on the market. Spatial resolution, sensitivity and angular resolution of the probes are believed to be determinant for the success of the identification of the s...

A prototype of the MeV gamma-ray imaging camera based on the full reconstruction of the Compton process has been developed. This camera consists of a micro-TPC that is a gaseous Time Projection Chamber (TPC) and scintillation cameras. With the information of the recoil electrons and the scattered gamma-rays, this camera detects the energy and incident direction of each incident gamma-ray. We de...

The purpose of quality control (QC) is to detect changes in the performance of a gamma camera system that may adversely affect the interpretation of clinical studies. Clearly, there are a large number of factors that contribute to the final image quality, including uniformity, resolution (both intrinsic and energy), collimation and the hard copy device. In addition, for certain types of studies...