技术报告。使用计算机牙科放射成像技术实现高对比度图像的处理。
Technical report. Processing to achieve high-contrast images with computed dental radiography.
作者信息
Hayakawa Y, Farman A G, Scarfe W C, Kuroyanagi K
机构信息
Division of Radiology and Imaging Sciences, School of Dentistry, University of Louisville, Kentucky, USA.
出版信息
Dentomaxillofac Radiol. 1996 Sep;25(4):211-4. doi: 10.1259/dmfr.25.4.9084276.
OBJECTIVES
To determine the effects of equalization on image contrast and signal-to-noise ratio (SNR) with Computed Dental Radiography (CDR).
METHODS
Pixel value distributions were measured for various tissue thicknesses of a dental quality assurance jaw phantom and the average pixel values and SNR calculated.
RESULTS
Equalization resulted in enhanced image contrast of underexposed images by effecting pixel value adjustment with little change in SNR. Overexposed images demonstrated minimal difference in contrast or SNR when equalization was applied.
CONCLUSION
The equalize function of CDR is a convenient method to provide high-contrast images from underexposed images without detriment to the SNR. As it does not compensate for overexposure, the function will not lead to inappropriate overdosage of the patient.
目的
确定在牙科计算机放射摄影（CDR）中均衡对图像对比度和信噪比（SNR）的影响。
方法
测量牙科质量保证颌骨模型不同组织厚度的像素值分布，并计算平均像素值和SNR。
结果
均衡通过影响像素值调整，在SNR变化不大的情况下增强了曝光不足图像的图像对比度。应用均衡时，曝光过度图像在对比度或SNR方面显示出最小差异。
结论
CDR的均衡功能是一种从曝光不足图像中提供高对比度图像的便捷方法，且不会损害SNR。由于它不能补偿过度曝光，该功能不会导致对患者的不当过量照射。
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