Ling C C, Schell M C, Yorke E D, Palos B B, Kubiatowicz D O
Med Phys. 1985 Sep-Oct;12(5):652-5. doi: 10.1118/1.595689.
Two-dimensional dose distribution has been measured for the new (model 6711) 125I seeds used in interstitial implants. Two independent methods, using a silicon diode or thermoluminescent dosimeters, yielded identical results. At any given distance r from the seed center, the dose varies with theta, the angle relative to the seed's axis. Similarly, the r dependence of the dose distribution is different at various theta values. These observations can be qualitatively understood in terms of several factors, namely, source encapsulation, geometrical relationship, and attenuation and scatter. Empirical expressions which approximate the measured results have been developed to facilitate clinical dose distribution calculations.
已对用于组织间植入的新型（6711型）125I种子进行了二维剂量分布测量。使用硅二极管或热释光剂量计的两种独立方法得出了相同的结果。在距种子中心的任何给定距离r处，剂量随相对于种子轴的角度θ而变化。同样，在不同的θ值下，剂量分布的r依赖性也不同。这些观察结果可以根据几个因素定性地理解，即源封装、几何关系以及衰减和散射。已开发出近似测量结果的经验表达式，以方便临床剂量分布计算。
