Schmidt R A, Doi K, Sekiya M, Xu X W, Giger M L, Lu C T, Mojtahedi S, MacMahon H
Kurt Rossmann Laboratories for Radiologic Image Research, Department of Radiology, University of Chicago, IL 60637.
AJR Am J Roentgenol. 1990 May;154(5):1107-10. doi: 10.2214/ajr.154.5.2108553.
The image quality of radiographs developed by a new ultrarapid processor was evaluated to determine if faster processing causes degradation in the image. The processor used was the Konica Super-Rapid SRX-501 model. Two films designed for this processor (Konica MGH-SR and MGL-SR) were processed in 45 sec and were compared with standard rapid processing in 90 sec of corresponding conventional films (Kodak TMG and OC). Rare-earth screens (Kodak Lanex Regular and Lanex Medium) used with the new and conventional films interleaved during angiographic studies or for phantom images were assessed for image quality. The basic imaging properties of the screen-film systems were examined by measuring (1) Hurter and Driffield curves, (2) modulation transfer functions by using the slit method, and (3) noise Wiener spectra. Subjective clinical assessment showed that the images obtained with ultrarapid processing were acceptable, with increased contrast and graininess. Hurter and Driffield curve measurements confirmed higher gradients. Modulation transfer function measurements were the same as for the conventional films. Noise Wiener spectrum measurements showed a 10% increase in noise for MGH-SR vs TMG film and a 30% increase for MGL-SR vs OC film. We conclude that acceptable image quality can be obtained using ultrarapid processing, with processing time approximately 60% that of conventional rapid processing. Potential applications include all areas in which rapid availability of the radiograph for interpretation is important. Although the processor studied was the first of its kind available, our evaluation indicates that the technology is available for a new class of ultrarapid processors.
对一种新型超快速洗片机冲洗出的X光片图像质量进行了评估，以确定更快的冲洗过程是否会导致图像质量下降。所使用的洗片机是柯尼卡Super-Rapid SRX-501型号。为该洗片机设计的两种胶片（柯尼卡MGH-SR和MGL-SR）在45秒内完成冲洗，并与相应传统胶片（柯达TMG和OC）在90秒内的标准快速冲洗进行比较。在血管造影研究或体模成像过程中，将与新型和传统胶片交错使用的稀土增感屏（柯达Lanex Regular和Lanex Medium）的图像质量进行了评估。通过测量（1）赫特和德里菲尔德曲线、（2）使用狭缝法测量调制传递函数、以及（3）噪声维纳频谱，来检查增感屏-胶片系统的基本成像特性。主观临床评估表明，超快速冲洗获得的图像是可以接受的，对比度和颗粒感有所增加。赫特和德里菲尔德曲线测量证实了更高的梯度。调制传递函数测量结果与传统胶片相同。噪声维纳频谱测量表明，与TMG胶片相比，MGH-SR胶片的噪声增加了10%，与OC胶片相比，MGL-SR胶片的噪声增加了30%。我们得出结论，使用超快速冲洗可以获得可接受的图像质量，冲洗时间约为传统快速冲洗的60%。潜在应用包括X光片快速可得以供解读非常重要的所有领域。尽管所研究的洗片机是同类产品中的第一款，但我们的评估表明，该技术可用于新型超快速洗片机。
