Simulation model of CT reconstruction used an X-ray source with a Gaussian distribution intensity, and the detector-to-ISO distance is 58mm, the source-to-ISO distance is 2.0mm, so the detector can be considered as an ideal point (i.e. so-called detector model) (To display more clearly, the X-ray target is enlarged disproportionately).

<p>Simulation model of CT reconstruction used an X-ray source with a Gaussian distribution intensity, and the detector-to-ISO distance is 58mm, the source-to-ISO distance is 2.0mm, so the detector can be considered as an ideal point (i.e. so-called detector model) (To display more clearly, the X-ray target is enlarged disproportionately).</p

Effect of the thickness of the target substrate on the ratio of X-ray intensity <i>I</i>_<i>T</i> / <i>I</i>_<i>S</i>.

<p>Effect of the thickness of the target substrate on the ratio of X-ray intensity <i>I</i>_<i>T</i> / <i>I</i>_<i>S</i>.</p

X-ray spectral distributions of point-like micro-targets irradiated by some different materials.

<p>(A) electron beam energy 30keV, height of point-like micro-targets is 1.0μm; (B) electron beam energy 90keV, height of point-like micro-targets is 5.0μm.</p

Model of a point-like micro-target.

<p>The left curves indicate the difference of the X-ray intensity produced by the point target and that by the substrate.</p

The relevance of the intensity of X-ray on the height h of a point-like micro-target with several materials (W, Mo, Cu).

<p>(A) electron beam energy 30keV; (B) electron beam energy 90keV.</p

Effects of different <i>I</i>_<i>T</i> / <i>I</i>_<i>S</i> on the CT image resolution.

<p>(A) <i>I</i>_<i>S</i> = 0; (B) <i>I</i>_<i>T</i> / <i>I</i>_<i>S</i> = 2, degradation of CT resolution isn’t obvious; (C)<i>I</i>_<i>T</i> / <i>I</i>_<i>S</i> = 1/2, degradation of CT resolution is tolerable; (D) <i>I</i>_<i>T</i> / <i>I</i>_<i>S</i> = 1/5, CT resolution degrades seriously. (Simulation CT image is 512×512 pixels).</p

Diagrammatic sketch of a novel microfocus tube with a point-like micro-target.

<p>Diagrammatic sketch of a novel microfocus tube with a point-like micro-target.</p

The dimension of the point-like micro-target and target substrate.

<p>The dimension of the point-like micro-target and target substrate.</p