Enlow R A, Hodak J A, Pullen K W, Bedworth D D, Moor W C, Reahard T M, Milligan V A
Radiology. 1980 Aug;136(2):413-7. doi: 10.1148/radiology.136.2.6773101.
Monthly utilization data for four diagnostic procedures (electroencephalography, brain scintigraphy, pneumoencephalography, and cerebral angiography) over a 10-year period were collected from a neurological institute. The computed tomographic (CT) scanner was introduced in the seventh year. Its effect on the usage of the alternative procedures was examined using three measures: (a) computing pre- and post-CT average monthly usage, (b) comparing fitted curves for the pre- and post-CT periods, and (c) projecting usage had the scanner not been available. Projected charges were compared with actual charges, and the scanner was found to be charge-saving in the second and third years of its use.
我们从一家神经学研究所收集了10年间四种诊断程序（脑电图、脑闪烁显像、气脑造影和脑血管造影）的月度使用数据。计算机断层扫描（CT）扫描仪在第7年被引入。我们使用三种方法研究了它对替代程序使用情况的影响：（a）计算CT引入前后的月平均使用量，（b）比较CT引入前后时期的拟合曲线，以及（c）预测如果没有该扫描仪时的使用情况。将预测费用与实际费用进行比较，发现该扫描仪在使用的第二年和第三年节省了费用。
