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J Korean Soc Ther Radiol > Volume 15(2); 1997 > Article
Journal of the Korean Society for Therapeutic Radiology 1997;15(2): 153-158.
Comparative Analysis of Bone Mineral Contents withDual-Energy Quantitative Computed Tomography
Tae Jin Choi, Seon Min Yoon, Ok Bae Kim, Sung Moon Lee, Soo Jhi Suh
1Department of Therapeutic Radiology, School of Medicine, Keimyung University, Daegu, Korea.
2Department of Diagnositic Radiology, School of Medicine, Keimyung University, Daegu, Korea.
The Dual-Energy Quantitative Computed Tomography(DEQCT) was compared with bone equivalent K2HPO4 standard solution and ash weight of animal cadaveric trabecular bone in the measurement of bone mineral contents(BMC). METHOD AND MATERIALS: The attenuation coefficient of tissues highly depends on the radiation energy, density and effective atomic number of composition.The bone mineral content of DEQCT in this experiments was determined from empirical constants and mass attenuation coefficients of bone,fat and soft tissue equivalent solution in two photon spectra.In this experiments, the BMC of DEQCT with 80 and 120kVp X rays was compared to ash weight of animal trabecular bone.
We obtained the mass attenuation coefficient of 0.2409, 0.5608 and 0.2206 in 80kVp, and 0.2046, 0.3273 and 0.1971cm2/g in 120kVp X-ray spectra for water, bone and fat equivalent materials, respectively.The BMC with DEQCT was acomplished with empirical constants K1=0.3232, K2=0.2450 and mass attenuation coefficients has very closed to ash weight of animal trabecular bone. The BMC of empirical DEQCT and that of manufacturing DEQCT were correlated with ash weight as a correlation r=0.998 and r=0.996, respectively.
The BMC of empirical DEQCT using the experimental mass attenuation coefficients and that of manufacture have showed very close to ash weight of animal trabecular bone.
Key Words: Bone Mineral Contents, Dual-Energy Quatitative Computed Tomography
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