A fully commercialized intraoperative specimen radiographic system (IOSRS) based on carbon nanotube (CNT) emitter has been developed and the optimization of electron beam (E-beam) focusing characteristic of X-ray source is analyzed in this paper. The IOSRS can be used inside the operation theatre and helps reduce the surgery time during breast conserving surgery by confirming the extent of margin on specimen. For this, a highly focused X-ray source is required which depends on the focusing structure of Electron gun (E-gun). Normally, a separate focuser and grid are added in the filament X-ray tube to produce a narrow E-beam and perfectly digitalized X-ray pulses, respectively. However, in CNT based X-ray tubes, the focuser and grid can be integrated as one structure called self-focusing gate structure. The self-focusing gate structure can extract electrons and focus the E-beam producing perfect pulses of X-ray dose and simultaneously enhancing the spatial resolution quality of X-ray source. In this study, we have investigated the effect of changing the length of selffocusing gate structure on the spatial resolution capability of X-ray system and its effect on the field electron emission performance of CNT E-gun.
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