Publications [#64062] of James T. Dobbins

Papers Published
  1. Hasegawa, B.H. and Dobbins, J.T. and Peppler, W.W. and Kudva, B.V. and Melbye, K.M. and Van Lysel, M.S. and Lee, C.S. and Naimuddin, S. and Lancaster, J.C. and Mistretta, C.A., Selective exposure radiography using digitally-formed X-ray beam attenuators, Proc. SPIE - Int. Soc. Opt. Eng. (USA), vol. 419 (1983), pp. 282 - 8 .

    Abstract:
    Compensation attenuators can provide fundamental improvements in radiographic image formation by modifying patient dose distribution, reducing scatter fractions in dark regions of the image, and easing dynamic range requirements for film and video systems. The authors have designed a software-based system which forms a heavy-metal attenuator from a digital image of the patient. At present, the attenuators are constructed manually from a pattern generated by the computer, but several techniques are being investigated which may permit fabrication and positioning during suspension of respiration. Phantom studies demonstrates that, in nonsubtractive applications, unsharp masking by the X-ray beam attenuator enhances local contrast, while in digitally subtracted images, attenuators eliminate dark regions where iodine signals otherwise are degraded by video and quantum noise