Archer B R, Almond P R, Wagner L K
Med Phys. 1985 Sep-Oct;12(5):630-3. doi: 10.1118/1.595684.
A Laplace transform pair model, previously shown to accurately reconstruct x-ray spectra at diagnostic energies, has been applied to megavoltage energy beams. The inverse Laplace transforms of 2-, 6-, and 25-MV attenuation curves were evaluated to determine the energy spectra of these beams. The 2-MV data indicate that the model can reliably reconstruct spectra in the low megavoltage range. Experimental limitations in acquiring the 6-MV transmission data demonstrate the sensitivity of the model to systematic experimental error. The 25-MV data result in a physically realistic approximation of the present spectrum.
一种先前已被证明能在诊断能量下准确重建X射线光谱的拉普拉斯变换对模型，已被应用于兆伏能量束。对2兆伏、6兆伏和25兆伏衰减曲线的拉普拉斯逆变换进行了评估，以确定这些束流的能谱。2兆伏的数据表明，该模型能够可靠地重建低兆伏范围内的能谱。获取6兆伏传输数据时的实验局限性表明了该模型对系统实验误差的敏感性。25兆伏的数据得出了当前能谱的符合物理实际的近似结果。
