Construction of a copper stepwedge with aluminum equivalent mean gray values
AUTOR(ES)
Dündar, Nesrin, Güneri, Pelin, Önem, Erinç, Boyacioğlu, Hayal
FONTE
Journal of Applied Oral Science
DATA DE PUBLICAÇÃO
2010-08
RESUMO
OBJECTIVES: To produce a copper (Cu) stepwedge with aluminum (Al) equivalent mean gray values (MGV). MATERIAL AND METHODS: The thicknesses of Cu steps that were equivalent to those of the Al were formulated using the X-ray attenuation properties of the materials. The Al and fabricated Cu stepwedges were radiographed, but the MGVs of the Cu stepwedge were mismatching to those of the Al. Using a mathematical function to adjust the pixel MGV of Cu stepwedge to those of the Al, new Cu stepwedges were created. In vitro iterations were performed until best approximation to Al was reached. RESULTS: The MGV of the Cu stepwedges fabricated by formularization were different than those of Al (p=0.001). Iteration method led to MGV similar to those of the Al stepwedge (p=0.207). CONCLUSIONS: Construction of a Cu stepwedge according to the basic rules of radiophysic failed to result in a stepwedge with similar radiodensity values to those of Al stepwedge. Further studies may use the formularization method only for prototype Cu wedge production, but consecutive iterations shall be compassed to obtain the best approximation to Al MGV.
Documentos Relacionados
- Relationship of Mean and Variance of Genotypic Values with Heterozygosity per Individual in a Natural Population
- Doubled Haploids for Estimating Mean and Variance of Recombination Values
- Analysis of the reproducibility of the gray values and noise of a direct digital radiography system
- Synthesis, Characterization and Exchange Reactions of Layered Double Hydroxides of Copper and Aluminum, Intercalated with Sulfate
- Experimental study of the neighborhood effects on the mean wind loading over two equivalent high-rise buildings