孕周的超声无损估计

本文讨论了孕周的超声无损估计方法，传统上，对孕周的估计是通过Ｂ型超声测量胎儿器官的有关参数，辅以经验公式而得到。但是由于经验公式无统一形式，且参数皆单独使用，估计结果离散度大，难以实用化。本文对Ｂ型超声测量所得胎儿参数应用数量化理论，建立孕周自动估计的方法。由于在实际应用中，应用数量比理论所得的相应正规方程，难以满足通常求解方法的前提条件，本文引入广义逆矩阵理论求解正规方程。另外，本文进一步讨论了

Non-invasive estimation of the gestational week using data from the medical ultrasound

Several methods of non-invasive estimation of the gestational week using data from the medical ultrasound are discussed in this paper. Generally, the gestational week is estimated by an empirical formula using the related parameters of fetal organs measured by B-mode medical ultrasound. Due to the disunity of the empirical formulas and separate usage of parameters, the results of estimation are highly dispersed and cannot be used in practice. The quantification theory is used in this paper to quantify the measured fetal parameters, and to design an automatic estimation method for the gestational week. In practical application, the corresponding regular equations obtained from the quantification theory are difficult to meet the requirement of the premise of the common solution method, so a generalized inverse matrix theory is proposed in this paper. In addition, the selection of items and the segmentation of categories in the application of the quantification theory are thoroughly discussed, while results of various segmentation methods of items and categories are compared. The non-invasive estimation method of the gestational week established through the present work seems to have shorter computation time, higher estimation resolution, and be more practical in the clinic application.