990400 Rev C 2010 May 1
Radiation Environment Survey
13-11
Sensitivity Profile
A 40 µm diameter Tungsten wire was scanned using the standard
Diameter 16cm protocol with 0.2mm voxel resolution. The wire was
held vertically at the system isocenter.
The Hounsfield units of the reconstructed image of the wire was
measured at several slice positions with 0.2mm width and the
resulting profile was compared against a Gaussian curve. For each
location, the width of the wire as measured by the standard deviation
of the Gaussian curve was converted to a Full-Width Half-
Maximum (FWHM) value using the conversion factor of 2.3548 and
was plotted and determined to be a measure of the sensitivity of the
system.
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