The purpose of this research is to establish the technical and clinical image quality of 30cm40cm dynamic medical x-ray flat detector(FD) compared to state-of-the-art Image Intensifier Television(II/TV) technology . The detector used was a Trixell Pixium 4700 designed for vascular and RF applications such as mixed fluoroscopy and radiography examinations . An RF system has been built which comprises both the FD as well as an II/TV detector . This system enables a direct comparison of technical image quality measurements and patient images under exactly the same x-ray conditions . Comparison of clinical examinations on individual patients or groups of patients are possible. Image quality measurements performed comprise Detective Quantum Efficiency (including Modulation Transfer Function and Noise Power Spectrum ) .Disk Transfer Function and temporal artifacts. Observation tests .using Threshold Contrast Detail Detectability(TCDD) techniques, were also performed .Results show a DQE of the flat detector this is higher compared to II/TV and , above all, constant over a wide dose range. The II/TV DQE drops at higher dose range due to fixed pattern noise and CCD shot noise .Furthermore veiling glare(or fiare) is substantially smaller in the FD-based system . TCDD subjective tests show improved system performance in favor of the FD system. |