口腔CT骨密度測量方法的設計與實現
[Abstract]:With the improvement of people's living standard and the aging of population, osteoporosis has been paid more and more attention, and dental implant technology has been widely used. Bone mineral density measurement is crucial in the diagnosis of osteoporosis and dental implants. There are many kinds of bone mineral density measurement techniques. In practical application, the method of measuring bone mineral density without phantom is simple, but the influence of muscle and fat can not be excluded, which brings some errors to the measurement results, and the repeatability of the results is poor. At present, oral CT plays a more and more important role in the measurement of bone mineral density (BMD). Based on oral quantitative CT, a method of in vitro calibration is proposed in this paper. There are two kinds of phantom: liquid model and solid model. Because of the complexity and high cost of making solid model, a simple and inexpensive liquid model is developed in this paper, in order to verify the feasibility of liquid body mold. The following works have been done: (1) the liquid model is scanned by oral CT machine to verify its uniformity. Ten layers of images are taken from the scanning image, and the results are compared and analyzed. It is found that the uniformity of the liquid model is very good. (2) the linearity of the liquid model is verified by scanning the liquid model and the solid model, and the fitting degree of the liquid model is higher than that of the solid model by comparing the ten layers of images in the scanning image. 0.9997. (3) scanning solid and liquid models and quality control phantom at the same time, taking ten layers of images from the scanning image, the difference of bone mineral density is between 3 and 5, and the maximum relative change is 2.91. (4) the liquid phantom is measured many times. From the comparison of the results of the ten layers of scanning images, we can see that the reproducibility and stability of the phantom are very good and can be maintained within half a year. (5) the liquid phantom and the bone sample are scanned simultaneously, which is compared with the ashing value of the bone sample, although the error is great. But the linear correlation reached 0.9, indicating that bone mineral density can well reflect the change of bone mineral. In order to verify the accuracy of bone mineral density (BMD) measured by oral CT, the measurement results of large spiral CT developed by Neussup were compared. The measurement error between oral CT and large spiral CT was within 0.2%, which could be ignored. In order to apply this method to clinical test, according to the design flow and realization principle, a volume model bone mineral density measurement software was successfully developed on quantitative CT.
【學位授予單位】:東北大學
【學位級別】:碩士
【學位授予年份】:2013
【分類號】:R816.98
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