Effect of manual compared with reference point superimposition on image quality in digital subtraction radiography.
Effect of manual compared with reference point superimposition on image quality in digital subtraction radiography.
复制标题
数字减影射线照相中手动与参考点叠加对图像质量的影响。
DOI：
10.1259/dmfr.18.4.2701173
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
A. Wenzel
中科院分区：
文献类型：
--
作者：
A. Wenzel
本研究的目的是比较一种新的减影程序的基础上定位的参考点（RP）在两个图像与经典的手动（M）重叠的图像在记录过程中。实验在22个干燥的家猪下颌骨上进行。从皮质制备具有七个边缘的骨碎片：分别为0.26、0.30、0.36、0.42、0.49、0.55和0.72 mm厚。每个下颌骨在0度垂直角度下无骨片进行X线摄影。然后将骨片固定在舌侧板上，拍摄一系列X线片，在此期间，垂直角度以1度间隔从0度变化到10度。在完成这一系列的曝光后，汞合金填充物被放置在右侧的两个磨牙中，并获得第二系列。将X线照片数字化（512 x 512 x 8位分辨率），存储在个人计算机中，然后通过两种方法以随机顺序相减。对于所有评价的成角，RP方法上级M方法;因为图像更均匀，如灰度直方图中较小的SD所示。最好的结果是在图像上与汞齐填充牙齿。RP方法观察到的骨边缘明显更多，尤其是当存在汞合金填充物时。因此，在使用减影X线摄影的临床试验中，RP方法可能上级于M。
The aim of this study was to compare a new subtraction program based on positioning of reference points (RP) in the two images with the classic manual (M) superimposition of the images during recording. The experiments were performed on 22 dry mandibles from domestic pigs. A bone chip was prepared from the cortex with seven edges: 0.26, 0.30, 0.36, 0.42, 0.49, 0.55 and 0.72 mm thick respectively. Each mandible was radiographed at 0 degrees vertical angulation without the bone chip. The bone chip was then fixed to the lingual plate for a series of radiographs during which the vertical angulation was varied from 0 degrees to 10 degrees at 1 degree intervals. After completion of this series of exposures, amalgam fillings were placed in the two molars on the right side and a second series obtained. The radiographs were digitized (512 x 512 x 8 bit resolution), stored in a personal computer and then subtracted in a random order by the two methods. The RP method was found to be superior to the M method for all the angulations evaluated; as the images were more homogeneous as shown by the smaller SD in the grey-scale histogram. The best results were obtained on images with amalgam-filled teeth. Significantly more bone edges were seen with the RP method, especially when amalgam fillings were present. The RP method may therefore be superior to the M in clinical trials using subtraction radiography.
通过减影射线照相测量牙周治疗对牙槽骨的影响。
影响因子：
4.3
作者：
Schmidt,EF;Webber,RL;Ruttimann,UE;Loesche,WJ
通讯作者：
Loesche,WJ