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系統識別號 U0026-0408201316550400
論文名稱(中文) 應用主成份分析超音波參數及類神經網路模式於預估胎兒體重
論文名稱(英文) Application of Principal Component Analysis and Artificial Neural Network on Ultrasonographic Parameters for Fetal Weight Estimation
校院名稱 成功大學
系所名稱(中) 生物醫學工程學系
系所名稱(英) Department of BioMedical Engineering
學年度 101
學期 2
出版年 102
研究生(中文) 鄭月琴
研究生(英文) Yueh-Chin Cheng
學號 p88951018
學位類別 博士
語文別 英文
論文頁數 103頁
口試委員 指導教授-鄭國順
口試委員-陳中明
口試委員-施東河
口試委員-李宗南
口試委員-孫永年
口試委員-詹寶珠
口試委員-張烱心
口試委員-張峰銘
中文關鍵字 主成份分析  類神經網路  兩階段法  超音波參數  預估胎兒體重 
英文關鍵字 Principle components analysis  Artificial Neural Network  two-step cluster analysis  Ultrasonographic Parameters  Fetal Weight Estimation 
學科別分類
中文摘要 準確的估計子宮內之胎兒大小是母胎醫學及周產期照顧領域中相當重要的發展。被預估的胎兒體重,在懷孕期,是為了評估正常及異常的胎兒成長;在產前,更是提供臨床醫師評估產婦生產的方式及時機,作為分娩前處置的重要參考依據。所以準確的估計胎兒體重,不僅降低母親及胎兒的生產風險,而且減少非必要的剖腹生產所造成醫療費用的浪費,對於提升生產品質有著實質且重要的臨床價值。在台灣,臨床上使用醫用超音波量測胎兒的生物度量參數,例如:雙頂骨間徑(BPD)、枕額徑(OFD)、頭圍(HC)、腹圍(AC)、股骨長度(FL)等,經由多項式迴歸模式來推導出胎兒體重預測值,由於待解之問題日趨複雜,對於低體重、極低體重、高體重、頭圍大腹圍小、頭圍小腹圍大、胎位不正、羊水過多及羊水過少之胎兒量測,臨床上所要求之準確性提昇,此模式已逐漸不夠使用。近年來,以高解析度的醫用超音波量測胎兒的生物度量參數,經由科學化的數值分析,再應用主成份分析及類神經網路的非線性模擬分析法可得到最理想的新生兒體重預測值。
本研究的目的為設計及發展以主成份分析為分組基礎之類神經網路預測模式,求得各組最佳預估胎兒體重輸出值。計劃之特定目標包括:(1)收集並建立胎兒超音波參數資料庫及資料統計檢定;(2)以主成份分析量化胎兒體型特徵值作為分組依據;(3)胎兒體型分組之分析;(4)建立及訓練分組基礎之倒傳遞類神經網路模式來預估胎兒體重;(5)建立超音波參數誤差補償調整模式;(6)以統計分析作為方法學之比較及進行系統可行性之評估。本研究的假說為:應用多變量統計基礎理論及現代類神經網路科技,可提供客觀量化的方法來改善應用胎兒超音波參數預估新生兒體重的準確性。
本研究方法,首先收集2,127位單胞胎新生兒其產前三天內胎兒的超音波參數值(雙頂骨間徑、枕額徑、腹圍、頭圍、股骨長度等) 及出生之新生兒真實體重,以上參數值經由(1)常態分析(Kolmogorov-Smirnov test)檢定資料分佈形態及項目分析(item analysis)篩檢出具有鑑別力的參數;(2)相關性分析(correlation analysis)及逐步迴歸法(stepwise regression)選取與胎兒體重最具貢獻度的超音波參數作為分組依據再利用K平均演算法 (K-means analysis) 進行胎兒分組之分析;(3)主成份分析(Principle components analysis)量化胎兒體型特徵值作為分組依據在利用兩階段法(two-step cluster analysis) 進行胎兒體型分組之分析;(4)建立及訓練分組倒傳遞類神經網路模式(back propagation network algorithm),並求得各組最佳預估胎兒體重輸出值;(5)以赤池信息量準則(Akaike information criterion)及最小均方誤差法(Minimum mean squared error)建立系統及參數的誤差補償模式。以胎兒體型作為網路分組之架構,將個案資料隨機分配為二組,其中1,489位作為建立及訓練倒傳遞類神經網路(比例共軛梯度演算法)學習模組,另外638位則作為驗證模組。預測準確度的評估是採用Friedman test 統計分析法。
本研究結果以胎兒體型分組為基礎之倒傳遞網路,驗證胎兒體重預估的準確度為 (n = 638,MAPE = 4.9 ± 3.5%,MAE = 149.4 ± 110.2g) 與台灣 (1) Hsieh formula 1B迴歸分析(n = 638,MAPE = 6.0 ± 4.6%,MAE = 173.2 ± 120.3g, p<0.01);(2) Hsieh formula 2B迴歸分析(n = 638,MAPE = 6.5 ± 7.2%,MAE = 175.1 ± 120.4g, p<0.01);(3)美國Hadlock 迴歸分析(n = 638,MAPE = 7.4 ± 5.3%,MAE = 224.6 ± 169.0g, p<0.01) 及 (4)以胎兒腹圍分組為基礎之倒傳遞網路(n = 638,MAPE = 5.3 ± 4.1%,MAE = 157.9 ± 119.9g, p<0.01)比較後,均有顯著的改善。
經由上述工程科技及原理的整合與應用發展一套準確預估胎兒體重的專家系統。本研究的重要性在於應用統計方法將數值範圍大、且變異性高的參數進行合理的分組,以改善各組參數的異質性。故以分組訓練類神經網路來預估胎兒體重的準確度,皆高於上述文獻方法之結果。研究貢獻在懷孕期間是監測胎兒生長發育的最重要指標,在產前是提供生產方式及處置的最安全選擇,可有效的降低嬰兒與產婦併發症及死亡率。
英文摘要 For obstetrics, prenatal assessment of fetal weight and growth is paramount. Accurate estimated fetal weight (EFW) is the principal way to measure and monitor fetal growth in utero, and thereby assist the management of delivery. EFW is an important and reliable method for predicting fetal growth disorders which can result in serious antenatal, perinatal, and postnatal complications. Clinicians rely on EFW for determining appropriate delivery mode, timing, and suitable delivery procedure to reduce maternal-fetal risk and medical cost. Accurate estimation of fetal weight lowers the risk of the normal spontaneous delivery (NSD). On the other hand, clinicians may encourage parents to proceed with NSD when a safe outcome is foreseeable and reduce medical costs. Currently, ultrasound (US) is the major tool for EFW. EFW methods, such as multiple regression model, are commonly used in clinical Obstetrics. Combinations of US fetal growth parameters, such as biparietal diameter (BPD), abdominal circumference (AC) and femur length (FL), along with Hsieh’s reported equations, are the major methods for the estimation of fetal weight in Taiwan. Although Hsieh’s regression methods are commonly accepted, estimation errors increase when birth weight is greater than 4000g or less than 2000g. Estimation errors are a common problem in daily practice for obstetricians so there is room for improvement of fetal weight estimation accuracy. Extreme body variations among fetal US parameters, such as macrosomia or low birth weight result in increasing error of EFW via regressive analysis. With the assistance of real-time high-resolution US and principal component analysis (PCA) along with artificial neural network (ANN), a better EFW model can be achieved.
The purpose of this research project was to design and develop an automated feature-based classification method. We attempted (1) to identify fetal characteristics through ultrasound parameters (USP) sets for classifying fetuses (2) in order to develop an artificial neural network (ANN). Our hypothesis is that using PCA and ANN can improve the accuracy of EFW. This research accomplishes the following procedures: (1) collect USP data for analysis; (2) apply PCA to extract the characteristic parameters of fetal groupings; (3) apply two-step cluster analysis for the classification of fetal groupings; (4) establish a back-propagation ANN model of the classified groups for fetal weight estimation; (5) Apply Akaike information criteria (AIC) and Minimum-mean-square-error (MMSE) compensation methods to USP data; (6) compare the clinical efficacy of our proposed ANN models and other conventional regression models of EFW.
The research was divided into five stages: (1) Collection of US measurements of fetal biometric parameters and preliminary parameters analysis; (2) Calculation of correlation analysis, stepwise regression and K-means with one parameter for fetal size classification; (3) Apply PCA and two-step cluster algorithm with multiple parameters for fetal size classification; (4) Use AIC and MMSE model to compensate for US errors; (5) Use ANN modeling on the classified groups for EFW. The dataset used in this study came from 2,127 singleton fetuses examined within 3 days prior to delivery. The cases were randomly divided into a training set with 1,489 samples and a testing set with 638 samples. The Friedman test was used for comparing the performance of the proposed ANN model with the regression-based EFW formulas.
Our experimental results showed the accuracy of EFW from our PCA-based ANN model was significantly better than the results generated by the Taiwanese conventional regression analysis equations (i.e. Hsieh’s formula 1B, or Hsieh’s formula 2B), and even better the results using the Western conventional regression equations (all p < 0.01). The mean absolute percent error (MAPE) and the mean absolute error (MAE) was 4.9 ± 3.5% and 149.4 ± 110.2 g for our proposed PCA-based ANN model, 6.0 ± 4.6% and 173.2 ± 120.3 g for the Hsieh 1B model, 6.5 ± 7.2% and 175.1 ± 120.4 g for the Hsieh 2B model, 7.4 ± 5.3% and 224.6 ± 169.0 g for the Hadlock model , and 5.3 ± 4.1% and 157.9 ± 119.9 g for our AC-based ANN model, respectively (all p <0.01).
Our study proves that statistical selection of US parameters for grouping, together with different ANN models, can improve EFW accuracy, even in fetuses with weight at range extremities. This study also shows the following are crucial to improve EFW accuracy: (1) considering and controlling the heterogeneity using statistics among the high variability and broad ranged US parameters, and (2) using extracted parameters to classify fetuses into suitable group for each ANN model. Establishment of standardized criteria for group classification is indispensable for the subsequent cluster methods. We believe our more accurate EFW models can decrease the risks of NSD and lower medical costs by contributing to better clinical decision-making, and reduce maternal-fetal morbidity and mortality.
論文目次 中文摘要 I
Abstract IV
誌謝 VIII
TABLE OF CONTENTS IX
LIST OF TABLES XII
LIST OF FIGURES XIV

Chapter 1 Introduction 1
1.1 Estimation of Fetal Weight 3
1.1.1 Fetal Ultrasound Biometry for Evaluating Fetal Weight 3
1.1.2 Regression Model 8
1.1.3 Artificial Neural Network Model 11
1.2 Principal Component Analysis 13
1.3 K-means Method 14
1.4 Back-propagation Networks 17
1.5 Motivation and Objectives 19
1.5.1 Purpose and Specific Aims 19
1.5.2 Research Hypothesis 21
1.5.3 Significance 21
Chapter 2 Materials and Methods 22
2.1 Data Collection 24
2.1.1 Ultrasonographic Measurement of Fetal Biometric Parameters 25
2.1.2 Descriptive Statistics and Item Analysis 29
2.2 Ultrasonographic Parameters (USPs) Analysis 30
2.2.1 AC-based Group Analysis 30
2.2.2 PCA-based Group Analysis 32
2.3 ANN Development for Fetal Weight Estimation 35
2.3.1 AC-based ANN Model 35
2.3.2 PCA-based ANN Model 39
2.4 Minimum Mean Squared Error Framework for Compensating USPs 43
2.4.1 AIC Database Partition and Subset Number Determination 45
2.4.2 Minimum Mean Squared Error (MMSE) Compensation 47
2.5 Accuracy Comparison and Performance Evaluation 48
Chapter 3 Results 51
3.1 Data Description 51
3.1.1 Descriptive Statistics 51
3.1.2 Strong Correlation between USP and BW 53
3.2 Results of AC-based Grouping 56
3.3 Results of Principal Component Analysis 57
3.4 Performance of AC-based ANN Model 60
3.5 Performance of PCA-based ANN Model 66
3.6 Performance of MMSE Model Combined with AIC 74
Chapter 4 Discussion 79
4.1 Characteristics of the AC-based Grouping 80
4.2 Effects on the PCA-based Transformation 81
4.3 Comparison and Efficacy Evaluation of Model-based Approaches 83
4.3.1 Effects of AC-based ANN Model for EFW 83
4.3.2 Effects on PCA-based ANN Model in EFW 84
4.3.3 Effects on MMSE Model Combined with AIC in EFW 86
Chapter 5 Conclusions and Recommendations 88
References 90
著作權聲明 103
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