Journal: Medical Physics

Article Title: Improving x-ray fluorescence signal for benchtop polychromatic cone-beam x-ray fluorescence computed tomography by incident x-ray spectrum optimization: A Monte Carlo study

doi: 10.1118/1.4895004

Figure Lengend Snippet: Components of MC model simulating the experimental setup. The PMMA phantom with GNP-loaded insert was irradiated by a virtual cone-beam source with configurable photon spectra. The XRF and scattered x-rays (at 90° with respect to the incident beam) from the GNP-loaded insert and phantom were collimated and detected by a shielded CdTe detector. Note that the incident beam collimator and filter were modeled by a virtual photon phase-space source. Inset: detail of detector element located inside the detector housing.

Article Snippet: The detector model was based on a commercially available cadmium-telluride (CdTe) gamma and x-ray detector (XR-100T-CdTe, Amptek, Inc.), which had a beryllium window of 100 μm thickness, 1.27 mm behind which was a 3 × 3 × 1 mm 3 CdTe crystal serving as the active area of the detector.

Techniques: Irradiation

Journal: Medical Physics

Article Title: Improving x-ray fluorescence signal for benchtop polychromatic cone-beam x-ray fluorescence computed tomography by incident x-ray spectrum optimization: A Monte Carlo study

doi: 10.1118/1.4895004

Figure Lengend Snippet: X-ray spectra, experimentally measured using a CdTe detector, obtained by filtration of 105 kVp x-ray beam through (a) 1-mm Pb filter and (b) 0.9-mm Sn filter. Fluence has been normalized to aid visual comparison (see Fig. ​Fig.44 for relative fluence comparison). These spectra were used as incident spectra in the MC model to generate XRF/scatter spectra, which in turn were compared with measured spectra for validating the model (see Fig. ​Fig.33).

Article Snippet: The detector model was based on a commercially available cadmium-telluride (CdTe) gamma and x-ray detector (XR-100T-CdTe, Amptek, Inc.), which had a beryllium window of 100 μm thickness, 1.27 mm behind which was a 3 × 3 × 1 mm 3 CdTe crystal serving as the active area of the detector.

Techniques: Filtration, Comparison