Development of 120 kV CNT-based digital x-ray tube for fluoroscopy

In fluoroscopy, X-rays are used to obtain the real-time moving images of the human anatomy. To do so, a pulsed fluoroscopy is used so that patient and staffs are exposed to minimum radiation possible. However, in most medium priced pulsed fluoroscopy systems, X-ray tube without grid is used. The grid-less X-ray tube cannot produce perfect digital pulses due to inherent problem associated with thermionic emission of filament. Thus, the patient is exposed to unnecessary radiation using conventional Fluoroscopic system. This problem can be easily solved using carbon nanotube (CNT) based digital X-ray tubes and are much cheaper to manufacture than grid controlled filament based X-ray tubes. In this study, we have developed 120 kV CNT-based digital X-ray tubes for pulsed fluoroscopy that can be operated at very high frequency ( MHz) producing low radiation dose during X-ray imaging. The DC and pulsed performance of Xray tube is studied, and the X-ray imaging of human skull is done with relatively low X-ray dose by pulsing the X-ray tube at 25 kHz. The commercial high voltage sources, function generator and N type-MOSFET were used for high-speed switching of E-beam during X-ray emission. This paper could help the radiologists and all the medical personnel understand the advantages of CNT based X-ray technology over filament for X-ray imaging use low dose radiation.