Abstract
The development of compact low profile gamma-ray detectors has allowed the production of small field of view, hand held imaging devices for use at the patient bedside and in operating theatres. The combination of an optical and a gamma camera, in a co-aligned configuration, offers high spatial resolution multi-modal imaging giving a superimposed scintigraphic and optical image. This innovative introduction of hybrid imaging offers new possibilities for assisting surgeons in localising the site of uptake in procedures such as sentinel node detection. Recent improvements to the camera system along with results of phantom and clinical imaging are reported.
Highlights
Scintillator and generate optical photons, the number being related to the absorbed photon energy, which are subsequently detected by the CCD — allowing the position and the energy of the incident gamma photon to be recorded [2]
A low cost webcam with a precision pinhole (100 μm diameter) was used to obtain the optical image. This design was simple to implement, it had a number of disadvantages — most significantly the absorption of a portion of the gamma rays by the electronics located on the back of the camera
In the updated configuration, gamma photons from the source will pass through the mirror with minimal absorption (< 3%) and scatter, whereas the optical photons are reflected towards the optical camera
Summary
A new Monte Carlo model, independently developed in IDL, has been designed to simulate the response of a pinhole-collimated scintillator-based gamma camera to incident photons. This model was developed to allow greater flexibility in both input and output information than a. The aim of its development was to fully understand the responses of components of the CGC. A simulated image is formed based upon the detection of scintillation photons in the CCD, along with the modelled effects of noise from the CCD and associated electronics. 3.2 Modelling results The model allows for the investigation of response from individual camera components along with the device as a whole. We anticipate that the simulation will be used to guide future developments of the CGC
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