Department of Physics, Bangalore University, Bangalore 560056, Karnataka, India.
Health Phys. 2011 May;100 Suppl 2:S92-9. doi: 10.1097/HP.0b013e3181f508ac.
Computerized tomography (CT) number (it is a normalized value of the x ray absorption coefficient of a pixel in a computed tomogram) and the effective atomic number (Z(eff)) of teeth [enamel outer surface (EOS), enamel middle (EM), enamel dentin junction towards enamel (EDJE), enamel dentin junction towards dentin (EDJD), dentin middle (DM), and dentin inner surface (DIS)] have been calculated for photon interactions by a direct method in the energy range of 1 keV-100 GeV using the computer program, WinXCOM. The sum of the computed values are tabulated. The estimated CT numbers are tabulated. All of the selected materials show an almost constant Z(eff) value in the energy range 500 keV to 1.5 MeV. Also, it is expected that the computed CT numbers are useful in medical diagnosis. Dosimetric implication of mass attenuation coefficient in teeth has also been discussed.
计算机断层扫描 (CT) 数（它是计算机断层图像中像素的 X 射线吸收系数的归一化值）和牙齿的有效原子数 (Z(eff)) [牙釉质外表面 (EOS)、牙釉质中部 (EM)、牙釉质牙本质交界处朝向牙釉质 (EDJE)、牙釉质牙本质交界处朝向牙本质 (EDJD)、牙本质中部 (DM) 和牙本质内表面 (DIS)] 已通过计算机程序 WinXCOM 在 1 keV-100 GeV 的能量范围内使用直接方法计算出用于光子相互作用的数值。计算出的数值总和列于表中。列出了估算的 CT 数。在所选择的所有材料中，在 500 keV 到 1.5 MeV 的能量范围内，Z(eff) 值几乎保持恒定。此外，预计计算出的 CT 数可用于医学诊断。还讨论了牙齿质量衰减系数的剂量学意义。
