Sliding window adaptive histogram equalization of intraoral radiographs: effect on image quality.
Sliding window adaptive histogram equalization of intraoral radiographs: effect on image quality.
复制标题
口腔内射线照片的滑动窗口自适应直方图均衡：对图像质量的影响。
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
A. Møystad
中科院分区：
文献类型：
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作者：
T. Sund;A. Møystad
目标
目的：探讨非交互滑动窗口自适应直方图均衡化(SWAHE)对比度增强技术是否能提高口腔临床X线片的图像质量。
方法
三名牙医阅读22张根尖周片和12张咬合储存磷(SP)X线片。对于根尖周读数，他们对检查的质量进行分级，以直观地定位根尖。对于咬合读数，他们在置信度量表上记录了所有近似龋齿的发生情况。每个读数首先在未处理的X光照片上进行(“单视图”)，然后用显示在未处理的版本(“双视图”)旁边的SWAHE处理的图像重新进行。SWAHE的处理参数对于所有图像都是相同的。
结果
对于根尖周检查，单视图质量低于最大值的病例中，双视图可提高52%的图像质量。对于咬合X光片，19%的病例改变了龋齿分类(包括阳性和阴性)，但登记的龋齿总数仅净增加3%。在这两种检查中，观察者间差异均未受影响。
结论
将非交互式SWAHE应用于牙科SP片，可产生补充的对比度增强图像，在双视读数中可改善根尖周检查的图像质量。SWAHE还影响咬合图像的龋齿诊断，有必要使用黄金标准进行进一步研究。
OBJECTIVES
To investigate whether contrast enhancement by non-interactive, sliding window adaptive histogram equalization (SWAHE) can enhance the image quality of intraoral radiographs in the dental clinic.
METHODS
Three dentists read 22 periapical and 12 bitewing storage phosphor (SP) radiographs. For the periapical readings they graded the quality of the examination with regard to visually locating the root apex. For the bitewing readings they registered all occurrences of approximal caries on a confidence scale. Each reading was first done on an unprocessed radiograph ("single-view"), and then re-done with the image processed with SWAHE displayed beside the unprocessed version ("twin-view"). The processing parameters for SWAHE were the same for all the images.
RESULTS
For the periapical examinations, twin-view was judged to raise the image quality for 52% of those cases where the single-view quality was below the maximum. For the bitewing radiographs, there was a change of caries classification (both positive and negative) with twin-view in 19% of the cases, but with only a 3% net increase in the total number of caries registrations. For both examinations interobserver variance was unaffected.
CONCLUSIONS
Non-interactive SWAHE applied to dental SP radiographs produces a supplemental contrast enhanced image which in twin-view reading improves the image quality of periapical examinations. SWAHE also affects caries diagnosis of bitewing images, and further study using a gold standard is warranted.