Tosi G, Brambilla M G, De Crescenzo S
Servizio di Fisica Sanitaria, Ospedale Niguarda Ca' Granda, Milano.
Radiol Med. 1992 Nov;84(5):641-4.
Aim of this work is to show the results of the evaluation of the sensitometric properties of a new Du Pont anti cross-over radiographic film system called Ultra Vision, based on a new film and different YTaO4 undoped screens whose emission is centered at about 335 nm. Fog, contrast, latitude, sensitivity, noise and resolution were tested: the MTFs were obtained by exposing a standard resolution pattern and using the "zero"-frequency step as a knife edge. The image of this knife edge was scanned with a microdensitometer with a 20 microns slit. The results (at 70 kVp with 2.5 mm Al and 2.5 mm Cu total filtration), compared with those of Du Pont conventional radiographic screen-film systems Cronex 10 S/Quanta, show that the new system significantly increases contrast, sensitivity and resolution and will consequently improve, in the clinical use, radiographic image quality.
这项工作的目的是展示对一种名为“超视觉”的新型杜邦抗交叉射线照相胶片系统的感光特性评估结果，该系统基于一种新型胶片和不同的未掺杂钇钽酸盐增感屏，其发射中心波长约为335纳米。测试了灰雾度、对比度、宽容度、感光度、噪声和分辨率：调制传递函数（MTF）是通过曝光标准分辨率图案并将“零”频率步长用作刃边来获得的。用带有20微米狭缝的微密度计扫描该刃边的图像。与杜邦传统射线照相增感屏 - 胶片系统Cronex 10 S/Quanta的结果相比，结果（在70 kVp、总滤过为2.5毫米铝和2.5毫米铜的条件下）表明，新系统显著提高了对比度、感光度和分辨率，因此在临床应用中将会改善射线照相图像质量。
