Bone densitometry using x-ray spectra
| Autor: | K. Ganezer, M. Krmar, S. Shukla |
|---|---|
| Rok vydání: | 2010 |
| Předmět: |
Materials science
Radiological and Ultrasound Technology business.industry chemistry.chemical_element Germanium Spectral line Semiconductor detector Absorptiometry Photon Optics medicine.anatomical_structure chemistry Bone Density medicine Feasibility Studies Humans Radiology Nuclear Medicine and imaging Cortical bone Area density Densitometry business Spectral method Beam (structure) Aluminum |
| Zdroj: | Physics in Medicine and Biology. 55:6105-6123 |
| ISSN: | 1361-6560 0031-9155 |
| DOI: | 10.1088/0031-9155/55/20/005 |
| Popis: | In contrast to the two distinct energy regions that are involved in dual-energy x-ray absorptiometry for bone densitometry, the complete spectrum of a beam transmitted through two layers of different materials is utilized in this study to calculate the areal density of each material. Test objects constructed from aluminum and Plexiglas were used to simulate cortical bone and soft tissue, respectively. Solid-state HPGe (high-purity germanium) detectors provided high-resolution x-ray spectra over an energy range of approximately 20-80 keV. Areal densities were obtained from spectra using two methods: a system of equations for two spectral regions and a nonlinear fit of the entire spectrum. Good agreement with the known areal densities of aluminum was obtained over a wide range of PMMA thicknesses. The spectral method presented here can be used to decrease beam hardening at a small number of bodily points selected for examination. |
| Databáze: | OpenAIRE |
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