Jones G A, Schuman N J, Woods M A
Department of Biologic and Diagnostic Sciences, College of Dentistry, University of Tennessee, Memphis 38163, USA.
J Clin Pediatr Dent. 1998 Winter;22(2):121-3.
An Everest 3000 Radiovisiography (RVG) Video system (Trophy USA Inc., Fredericksburg, VA 22402) was compared with conventional radiography using Ektaspeed Plus film (Eastman Kodak Co., Rochester, NY 14650). Previous studies of the RVG system with a special computer controlled x-ray timer (Trophy USA, Inc.) claimed a significant reduction in radiation. Trophy has also claimed that the RVG system can provide diagnostic quality images utilizing existing conventional x-ray generators. This study used a conventional timer and generator. Since it would be logical to assume that many practitioners would use the equipment "in place" rather than invest in new, unfamiliar equipment. Estimated Skin Exposure (air) was used as the primary criteria for comparative purposes. Exposure has been defined as "a measure of radiation quantity, the capacity of ionize air. The roentgen (R), is the traditional unit of radiation exposure measured in air"; The results indicate that the RVG system when combined with a standard conventional timer actually generated greater radiation exposure than does standard, routine radiography.
将一台珠穆朗玛峰3000型放射成像（RVG）视频系统（美国奖杯公司，弗吉尼亚州弗雷德里克斯堡，邮编22402）与使用爱克发速显增强型胶片（伊士曼柯达公司，纽约州罗切斯特，邮编14650）的传统放射摄影进行了比较。先前对配备特殊计算机控制X射线定时器的RVG系统（美国奖杯公司）的研究称辐射显著减少。奖杯公司还声称，RVG系统利用现有的传统X射线发生器就能提供诊断质量的图像。本研究使用的是传统定时器和发生器。因为可以合理地假设许多从业者会使用“现有的”设备，而不是投资购买新的、不熟悉的设备。估计皮肤暴露量（空气）被用作比较的主要标准。暴露被定义为“辐射量的一种度量，即电离空气的能力。伦琴（R）是在空气中测量的传统辐射暴露单位”；结果表明，当RVG系统与标准传统定时器结合使用时，实际产生的辐射暴露比标准的常规放射摄影更大。
