PROJECT TITLE :
Low-Bremsstrahlung X-Ray Source Using a Low-Voltage High-Current-Density Nanostructured Field Emission Cathode and a Transmission Anode for Markerless Soft Tissue Imaging
We report the planning, fabrication, and proof-of-concept characterization of an X-ray generator for improved X-ray absorption imaging that uses a nanostructured field emission cathode as the electron source and a microstructured transmission anode as the X-ray generating structure. Field emission cathodes consume less power, respond faster, and tolerate lower vacuum than the thermionic cathodes used in standard X-ray generators. The use of a transmission anode, rather than a standard reflection anode, permits filtering of the background radiation (bremsstrahlung) whereas permitting efficient generation of X-ray at lower voltages by exciting atomic shell transitions, ensuing in emission of X-ray with slender spectral linewidth for sharper imaging of biological tissue. The fabricated field emission cathode contains arrays of self-aligned and gated silicon field emitters. The field emission cathodes turn on at bias voltages as low as twenty five V, and their gates transmit virtually one hundredp.c of the electrons to the anode. The cathodes manufacture per-emitter electron currents in excess of two μA (current density >two A/cm2) at a bias voltage of 80 V. A desktop rig is made to come up with X-ray with a field emission cathode and transmission anode. Using the facility, we tend to obtained X-ray absorption pictures of several objects. The images clearly show details underneath five hundred μm in size, in addition to soft tissue and fine bone structures without using contrast agents.
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