Evans M D, Astrahan M A, Bate R
Medical Physics Unit, McGill University, Montreal, Canada.
Med Phys. 1993 May-Jun;20(3):769-75. doi: 10.1118/1.597031.
The accurate localization of ophthalmic tumors on the scleral surface is important when calculating radiation dose to the tumor and adjacent structures from episcleral I-125 plaques. This is particularly true for tumors close to the fovea or optic nerve. A fundus view diagram of the eye is often used by ophthalmologists to describe the size and shape of the tumor perimeter as well as its geographical location on the retinal surface. There is, however, an inherent inaccuracy associated with the use of a hand drawn diagram to obtain physical measurements. A computer planning program has been developed which uses CT and a digitized photographic montage of the posterior hemisphere to estimate the size and location of posteriorly located tumors. A simple phantom was constructed to test the software and a direct comparison made between planned versus measured tumor size and location in an excised eye.
在计算经巩膜 I - 125 敷贴器对肿瘤及相邻结构的辐射剂量时，准确确定眼肿瘤在巩膜表面的位置非常重要。对于靠近黄斑或视神经的肿瘤来说尤其如此。眼科医生经常使用眼底视图图来描述肿瘤周边的大小和形状及其在视网膜表面的地理位置。然而，使用手绘图表进行物理测量存在固有的不准确性。已经开发了一种计算机规划程序，该程序使用 CT 和后半球的数字化摄影蒙太奇来估计后部肿瘤的大小和位置。构建了一个简单的模型来测试该软件，并对切除眼中计划的与测量的肿瘤大小和位置进行了直接比较。
