X-Ray CT of Highly-Attenuating Objects: 9- or 15- MV Spectra?

Stone, G ; Trebes, J ; Perry, R ; Schneberk, D ; Logan, C

Lawrence Livermore National Laboratory

关键词: Lawrence Livermore National Laboratory;    Dimensions;    Filtration;    Beam Dumps;    Air;   

DOI  :  10.2172/883611
RP-ID  :  UCRL-TR-215180
RP-ID  :  W-7405-ENG-48
RP-ID  :  883611

美国|英语

来源: UNT Digital Library

【 摘 要 】

We imaged-highly attenuating test objects in three dimensions with 9-MV (at LLNL) and 15-MV (at Hill Air Force Base) x-ray spectra. While we used the same detector and motion control, there were differences that we could not control in the two radiography bays and in the sources. The results show better spatial resolution for the 9-MV spectrum and better contrast for the 15-MV spectrum. The 15-MV data contains a noise pattern that obfuscates the data. It is our judgment that if sufficient attention were given to design of the bay, beam dump, collimation, filtration and linac spot size; a 15-MV imaging system using a flat panel could be developed with spatial resolution of 5 lp/mm and contrastive performance better than we have demonstrated using a 9-MV spectrum.