Design of a digital beam attenuator system for chest radiography
Published
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