Photon Counting Energy Dispersive Detector Arrays for X-ray Imaging

Photon-Counting Arrays for Time-Resolved Imaging

The paper presents a camera comprising 512 × 128 pixels capable of single-photon detection and gating with a maximum frame rate of 156 kfps. The photon capture is performed through a gated single-photon avalanche diode that generates a digital pulse upon photon detection and through a digital one-bit counter. Gray levels are obtained through multiple counting and accumulation, while time-resolv...

X-ray Imaging Using a Hybrid Photon Counting GaAs Pixel Detector

The performance of hybrid GaAs pixel detectors as X-ray imaging sensors were investigated at room temperature. These hybrids consist of 300 μm thick GaAs pixel detectors, flip-chip bonded to a CMOS Single Photon Counting Chip (PCC). This chip consists of a matrix of 64 x 64 identical square pixels (170 μm x 170 μm) and covers a total area of 1.2 cm. The electronics in each cell comprises a prea...

Single Photon Counting X-Ray Imaging Through Gigabit Ethernet Transmission

High-performance computing capability enabled the development of a multi-energy X-ray imaging system which includes a data-acquisition, preprocessing and transmission module, followed by image reconstruction module. The data acquisition, pre-processing and transmission module are located at the pixel sensor side, and the image reconstruction is completed by using a GPU on a host PC. Thus, it re...

Single Photon Counting X-Ray Micro-Imaging of Biological Samples

X-ray Photon Counting and Two-Color X-ray Imaging Using Indirect Detection

In this paper, we report on the design and performance of a 1 cm², 90 × 92-pixel image sensor. It is made X-ray sensitive by the use of a scintillator. Its pixels have a charge packet counting circuit topology with two channels, each realizing a different charge packet size threshold and analog domain event counting. Here, the sensor's performance was measured in setups representative of a medi...