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Optical Engineering

Electro-optic imaging chain for a biplanar fluorscope for neurosurgery: magnetic field sensitivity and contrast measurements
Author(s): P. A. Ramos; Stephen W. Allison; J. A. Molloy; Michael A. Lawson; E. G. Quate; Rogers C. Ritter; George T. Gilles; Michael Sean Grady; Matthew A. Howard
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Paper Abstract

The effects of magnetic fields on the microchannel plate (MCP) image intensifiers to be used in a novel biplanar fluoroscope are studied along with the system's overall contrast as a function of beam energy. For a second-generation device with wrap-around power supply, B-3dB values for the gain roll-off were found to be approximately 0.08 T (axial field) and 0.06 T (transverse field). The maximum image shift resuiting from a 0.0035-T transverse field is found to be 0.065 mm, limited by centroid location error resulting from low-dose x-ray noise. The results of x-ray contrast studies suggests that the presently estimated 0.1-rad dose delivered to the patient (2-h magnetic stereotaxis procedure; 12% "fluoro-on" duty cycle) might be reduced by increasing the x-ray energy.

Paper Details

Date Published: 1 July 1993
PDF: 13 pages
Opt. Eng. 32(7) doi: 10.1117/12.138719
Published in: Optical Engineering Volume 32, Issue 7
Show Author Affiliations
P. A. Ramos, Univ. of Virginia (United States)
Stephen W. Allison, Oak Ridge National Lab. (United States)
J. A. Molloy, Univ. of Virginia (United States)
Michael A. Lawson, Univ. of Virginia (United States)
E. G. Quate, Univ. of Virginia (United States)
Rogers C. Ritter, Univ. of Virginia (United States)
George T. Gilles, Univ. of Virginia (United States)
Michael Sean Grady, Harborview Medical Ctr. (United States)
Matthew A. Howard, Harborview Medical Ctr. (United States)

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