Speaker
Description
In this study, the Detective Quantum Efficiency (DQE) was measured by calculating the DQE at zero- frequency, the modulation transfer function (MTF), and the noise power spectrum (NPS) for Timepix3 detectors equipped with 500 μm silicon (Si) sensor (biased to 200 V and threshold equal to 3 keV) and 1mm Cadmium Telluride (CdTe) sensor (bias equal to -300V and threshold set to 5 keV). By comparing these parameters, the impact of sensor material on spatial resolution and noise characteristics was assessed. The MTF, NPS and DQE parameters were calculated with datasets using two different acquisition modes; counting mode, where the particle hits are not clustered and Time of Arrival (ΤοΑ) and Time over Threshold (ΤοΤ) mode, where the particle hits are clustered and their center of mass (c.m) is calculated. It was concluded that the c.m dataset provided better MTF and NPS values leading to an improved DQE estimation. It was also possible to correct the charge sharing caused by fluorescence events in the CdTe by identifying the clusters, reconstructing the energy of the initial particle and assigning this energy to the position of the initial hit which generated the fluorescent particle. It was shown that the CdTe sensor offer an overall better detector performance than the Si sensor for high-resolution imaging applications. Systems with higher DQE can produce images with better contrast and lower noise, making them ideal for dose-sensitive applications like medical imaging.
| Workshop topics | Detector systems |
|---|
