Flat detector technology

Flat detector technology is subject to further development and continuous improvement. Miniaturized electronics will allow for even thirmer and flghter detectors required for mobile or portable applications. Higher bit depths of 16 bits or even 18 bits wiU improve C-arm CT image quaHty, allowing it to further approach the low-contrast resolution of multi-sflce computed tomography (MSCT). 

Flat detector technology has gained in acceptance over the conventional X-ray fihn because of its higher absorption efficiency and wider dynamic range. Furthermore, flat detectors are capable of direct, several frames... 

It is amazing to observe the continuing rapid technological development in multishce CT and its new clinical applications. This volume again offers a comprehensive overview of all recent new experimental and clinical research in this field, but it also includes new chapters on dynamic volume CT with 320 detector rows and on flat detector CT. Numerous new and excellent illustrations help to push this book into an even higher scientific orbit. 

The detector setup consists of four 256 x 256 pixel amorphous silicon technology sensor flat panels with 0.75 x 0.75 mm pixel size, having an active area of 192 x 192 mm [5j. These sensors are radiation sensitive up to 25 MeV and therefor well suited for detecting the LINAC radiation. The four devices are mounted onto a steel Irame each having the distance of one active area size from the other. With two vertical and two horizontal movements of the frame it is possible to scan a total area of about 0.8 x 0.8 m with 1024 x 1024 pixel during four independent measurements. 

Eortunately, for most photon device photodetectors, the dependence on modulation frequency is fairly flat across most of the region likely to be encountered with conventional NIR analyzer technology. Provided the D is satisfactory at the required measurement wavelengths, it is one useful parameter for detector selection. 

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