Design of a digital beam attenuator system for chest radiography


Journal Article

We have been testing a digital beam attenuator (DBA) system for fabricating patient- specific compensating filters to improve image quality in chest radiography. At present, the technique is limited by a 2 hour attenuator fabrication time and a 20 mR exposure used to acquire an initial image from which the attenutor is designed. We now are developing an improved DBA system capable of generating, in a few seconds, patient-specific compensating filters for clinical chest radiography. The initial image will be acquired at less than 1 mR of skin exposure using an intensifying screen viewed by a low light-level television camera. Image processing including scatter and beam-hardening corrections generate a 64x64 matrix of values from which the attenuator is fabricated. The attenutor will be fabricated with individual layers having a 16x16 format using a special purpose dot-matrix printer. Successive layers are shifted by a quarter of a dot width to maintain the 64x64 sampling frequency in the final attenuator. After the attenuator is positioned automatically in the x-ray beam, a final image will be acquired directly on film. © 1985 SPIE.

Full Text

Duke Authors

Cited Authors

  • Hasegawa, BH; Dobbins, JT; Naimuddin, S; Mistretta, CA; Peppier, WW; Van Lysel, MS; Cusma, JT; Lancaster, JC; Hoffman, P; Lee, CS; Molloi, S; Hangiandreou, N; Kudva, BV; Melbye, KM

Published Date

  • June 11, 1985

Published In

Volume / Issue

  • 535 /

Start / End Page

  • 332 - 339

Electronic International Standard Serial Number (EISSN)

  • 1996-756X

International Standard Serial Number (ISSN)

  • 0277-786X

Digital Object Identifier (DOI)

  • 10.1117/12.947279

Citation Source

  • Scopus