Rask R, Jensen P K
Department of Ophthalmology, Arhus University Hospital, Nørrebrogade 55, DK-8000 Arhus C, Denmark.
Graefes Arch Clin Exp Ophthalmol. 1995 Dec;233(12):777-82. doi: 10.1007/BF00184089.
Important prognostic information may be gained from knowledge of the volume and, over time, the change in volume of intraocular tumors such as choroidal melanomas.
The precision and time consumption of three different ultrasonographic methods were evaluated. Seven choroidal melanomas were analysed after placement of a ruthenium plaque and again after tumor regression had occurred. Perpendicular ultrasound B-scans were printed and analysed by overlay grid counting or outline tracing of tumor structures to calculate the volume. These two methods, using only two perpendicular scans, were compared with a micro-computer-controlled ultrasonographic three-dimensional rotation scanning system, where each tumor was manually outlined in 20 revolving scan planes
The three-dimensional volume scanning method was the most precise, but also the most demanding in hardware and time consumption.
Increased precision and less observer-dependent estimation of shrinkage rate after radiotherapy is available at the cost of sophisticated equipment.
通过了解眼内肿瘤（如脉络膜黑色素瘤）的体积以及随时间的体积变化，可能获得重要的预后信息。
评估了三种不同超声检查方法的精度和耗时。七例脉络膜黑色素瘤在放置钌板后进行分析，肿瘤消退后再次分析。打印垂直超声B扫描图像，并通过覆盖网格计数或肿瘤结构轮廓追踪来计算体积。这两种仅使用两次垂直扫描的方法与微机控制的超声三维旋转扫描系统进行了比较，在该系统中，每个肿瘤在20个旋转扫描平面中手动勾勒轮廓。
三维体积扫描方法最精确，但对硬件和耗时要求也最高。
以复杂设备为代价，可以提高放疗后收缩率估计的精度并减少观察者依赖性。
