Dual energy X-ray absorptiometry (DXA) is a dominant technique for the measurement of bone mineral density (BMD). Quality control (QC) of DXA is very important for the accuracy of results and correct interpretation ma...Dual energy X-ray absorptiometry (DXA) is a dominant technique for the measurement of bone mineral density (BMD). Quality control (QC) of DXA is very important for the accuracy of results and correct interpretation made by the physician. We have performed the quality control procedures of Lunar DPX Pro bone densitometer according to the manufacturer’s recommendations and current clinical guidelines at the Institute of Nuclear Medicine & Allied Sciences (INMAS), Khulna. The objective of this study is to maximize the performance of the technologist as well as the reliability of the equipment (Linearity, X-ray tube output, Half value layer, Kerma-area product, Radiation field size, Fan angle, Spatial resolution, Room safety). The study result shows that the mean BMD reading is 1.004 g/cm2 with a standard deviation of 0.0035 and co-efficient of variation 0.34%. It also shows that the precision of the technologist is good and there is no malfunctioning in the DXA bone densitometer.展开更多
The γ-ray densitometer has been designed and fabricated in our laboratory and carried out studies on temperature dependent γ-ray attenuation and thermo physical properties of NaCl, NaBr and NaF. The linear attenuati...The γ-ray densitometer has been designed and fabricated in our laboratory and carried out studies on temperature dependent γ-ray attenuation and thermo physical properties of NaCl, NaBr and NaF. The linear attenuation coefficients (μl) for the pellets of NaCl, NaBr and NaF as a function of temperature have been determined. The coefficients of temperature dependence of density have been reported. The variation of density and thermal expansion of NaCl, NaBr and NaF in the temperature range of 300 K - 1000 K have been studied and compared with results available in the literature. The temperature dependence of density and thermal expansion has been represented by linear equations. Volume thermal expansion coefficients have been reported.展开更多
文摘Dual energy X-ray absorptiometry (DXA) is a dominant technique for the measurement of bone mineral density (BMD). Quality control (QC) of DXA is very important for the accuracy of results and correct interpretation made by the physician. We have performed the quality control procedures of Lunar DPX Pro bone densitometer according to the manufacturer’s recommendations and current clinical guidelines at the Institute of Nuclear Medicine & Allied Sciences (INMAS), Khulna. The objective of this study is to maximize the performance of the technologist as well as the reliability of the equipment (Linearity, X-ray tube output, Half value layer, Kerma-area product, Radiation field size, Fan angle, Spatial resolution, Room safety). The study result shows that the mean BMD reading is 1.004 g/cm2 with a standard deviation of 0.0035 and co-efficient of variation 0.34%. It also shows that the precision of the technologist is good and there is no malfunctioning in the DXA bone densitometer.
文摘The γ-ray densitometer has been designed and fabricated in our laboratory and carried out studies on temperature dependent γ-ray attenuation and thermo physical properties of NaCl, NaBr and NaF. The linear attenuation coefficients (μl) for the pellets of NaCl, NaBr and NaF as a function of temperature have been determined. The coefficients of temperature dependence of density have been reported. The variation of density and thermal expansion of NaCl, NaBr and NaF in the temperature range of 300 K - 1000 K have been studied and compared with results available in the literature. The temperature dependence of density and thermal expansion has been represented by linear equations. Volume thermal expansion coefficients have been reported.
