Hurlburt C
Oral Surg Oral Med Oral Pathol. 1978 Nov;46(5):721-4. doi: 10.1016/0030-4220(78)90470-x.
Only two United States dental schools used rare earth screens for cephalometric radiography. Forty-five schools used calcium tungstate or barium lead sulfate screens; most schools combined medium- or high-speed screens with medium-speed films. The fastest conventional screen-film combination used was eight times as fast as the slowest. Twenty-two schools used grids with their screen-film systems.
只有两所美国牙科学校在头颅测量放射摄影中使用稀土增感屏。45所学校使用钨酸钙或硫酸铅钡增感屏；大多数学校将中速或高速增感屏与中速胶片结合使用。所使用的最快的传统增感屏-胶片组合的速度是最慢的组合的八倍。22所学校在其增感屏-胶片系统中使用了滤线栅。
