XPAD3: A new photon counting chip for X-ray CT-scanner

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

The effect of focal spot size on the spatial resolution of variable resolution X-ray CT scanner

Background: A variable resolution X-ray (VRX) CT scanner provides a great increase in the spatial resolution. In VRX CT scanners, the spatial resolution of the system and its field of view (FOV) can be changed according to the object size. One of the main factors that limit the spatial resolution of VRX CT scanner is the effect of the X-ray focal spot. Materials and Methods: A theoreti...

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...

Photon-counting imaging camera for high-resolution X-ray and -ray applications

Standard X-ray imaging techniques using CCDs require the integration of thousands of X-ray photons into a single image frame. Through the addition of a scintillating layer to the CCD it is possible to greatly increase the X-ray detection efficiency at high energies. Using standard imaging techniques with the inclusion of the scintillating layer does, however, leave serious limitations on the sp...