Radiation Does Reduced 3-D X-Ray Imager for Radiology
1Radiology, LensFree ltd, Israel
2Faculty of Engineering, Bar-Ilan University, Israel
PURPOSE: Developing novel imaging-like concept for computerized tomography (CT) yielding 3-D images with significantly reduced x-ray dose irradiated at patients without damaging the image quality.
METHODS AND MATERIALS: The imaging-like concept includes x-ray source beam-shaping module irradiating the patient without using collimators array. Then, time-changing array of pinholes is positioned in front of the x-ray detector to perform high-resolution 3-D imaging of the inspected patient. The reconstruction includes applying a modified mathematical Radon transformation and proper data decoding done in the spatial Fourier domain. The reduction in the required radiation dose is expressed in (1) usage of the scattered and not only transmitted x-ray radiation, (2) performing not a projection but rather an imaging with proper minification factor concentrating the collected energy to smaller area and (3) performing 3-D reconstruction from smaller number of projections (even a single projection gives partial 3-D information).
RESULTS: The proposed imaging-based CT system was physically modeled and simulated via Geant4 software where a reduction in the radiation dose of more than one order of magnitude was demonstrated. In addition to that, an experimental prototype was constructed and demonstrated the feasibility and the operability of the approach.
CONCLUSION: A novel concept to do radiation reduced CT scans is presented. The concept includes x-ray source beam-shaping and using time changing array of holes. The proposed concept was validated numerically and experimentally and has demonstrated the capability of reducing the radiation efficiency by an order of magnitude, being highly significant in radiology and for CT scans.
Keywords: Computerized tomography, x-ray imaging, radiation reduction