Each head has 96 Clear-PEM detector modules consisting of 32 LYSO Ce pixels with dimensions 2×2×20 mm3 packed in a 4×8 BaSO4 reflector matrix compressed between two Hamamatsu S8550 APD arrays in a double-readout configuration for Depth-of-Interaction (DoI) determination.
To this aim, we already demonstrated with a first prototype [30] a simple method for the DOI reconstruction in a monolithic scintillator with a double side readout.
The double side readout allows also to improve the time of flight capability of the detector due to the possibility to correct the difference in the length of the optical light path between the scintillation point and the photodetector [15].
The natural radioactivity of the LYSO has been used to calibrate the DOI response in modules composed of pixellated scintillators with double side readout [43, 44], and the same method was applied here to calibrate the DOI parameters.
Furthermore, it has been shown that with a double side readout of a pixelated scintillator array the DOI can be determined by comparing the magnitude of the signal collected at the two sides and that a resolution close to 2 mm can be reached using this method [12 14].
Simultaneous imaging of both orthogonal projections was done with a modified FLASH sequence [27] with double echo readout.
For the double-end readout MRPC, no incident position dependence is observed.
There have been many studies on Depth Of Interaction (DOI) identification for high resolution Positron Emission Tomography (PET) systems, including those on phoswich detectors, double-sided readout, light sharing methods, and wavelength discrimination.
The prototypes, together with the front end electronics (FEE) and time digitizer (TDIG) module have been tested at the E3 line of Beijing Electron Positron Collider (BEPCII) to study the difference between the single and double-end readout MRPC designs.
They are placed at the center of a reference telescope consisting of six planes of silicon detector with a double-sided strip readout.
In oma double mutants, multiple readouts of MSP signaling are defective (Detwiler et al. 2001) and oocytes grow abnormally large because they receive sustained low rates of MSP-dependent cytoplasmic flows (Detwiler et al. 2001; Govindan et al. 2009).
