Considering objective acceptance angle, dichroic and emission filter transmittances, LCTF characteristics, and camera quantum efficiency, around 8000 or 600 photons/s are finally detected within 10 nm LCTF-filtering window in wide-field or confocal mode, respectively.
In this respect, in [68] it was estimated that the number of detected Cerenkov photons could be increased by up to 35% by choosing a CCD camera with quantum efficiency peaked in the NIR range.
Conversely, the system with a Short Focal Length (SFL) camera has high measuring efficiency without enough sampling density.
Although D-SPECT uses a parallel hole collimator and Anger camera parallel hole collimator efficiency does not change with distance, D-SPECT sensitivity should decrease with increased distance from the heart.
The other dataset was generated using the program InSillicoTEM (Vulovic et al., 2013) to incorporate near experimental microscopic effects including contrast transfer function and detective quantum efficiency of camera.
Since the zodiacal light is faint and widespread all over the sky, the system consists of a very sensitive CCD camera with a quantum efficiency of 90% at 500 nm and a wide angle lens with a FOV of 92°×46°.
The scatter effects are assessed by analyzing the energy spectrum of 99mTc for the scatter fraction and calculating the camera's extrinsic counting efficiency and sensitivity, for five flood source thicknesses (12, 50, 100, 150 and 200 mm ) and three source-to-detector distances (0.7, 0.9 and 1.1 m).
To overcome this hurdle, the system will have to be redesigned to maximize throughput including installation of a camera with higher quantum efficiency in the UV visible region.
For efficiency, the camera settings (e.g., gain, exposure and contrast) are optimized before image capture (EXCAM), minimizing the opportunity for post-processing artifacts.
Since pre-filtering removes camera noise and improves coding efficiency dramatically, its efficient implementation has been an important issue in video sequence coding.
