100kV管電壓在256層螺旋CT冠狀動脈造影中的應用
發(fā)布時間:2024-02-07 02:40
目的 在回顧性心電門控冠狀動脈CTA檢查中,比較100kV管電壓、1000mAs管電流掃描模式與120kV管電壓、800mAs管電流掃描模式下的圖像質(zhì)量與輻射劑量的關系。 材料和方法 70例體重指數(shù)正;颊弑浑S機分為兩組,每組患者35例。第一組患者(男18例,女17例;平均年齡56.94±11.51歲)行回顧性心電門控冠狀動脈CTA檢查,采用100kV管電壓、1000mAs管電流掃描模式。第二組患者(男21例,女14例;平均年齡54.03±9.81歲)行回顧性心電門控冠狀動脈CTA檢查,采用120kV管電壓、800mAs管電流掃描模式。掃描完成后,兩名放射醫(yī)師獨立對冠狀動脈的圖像質(zhì)量進行主觀評價和客觀評價。主觀評價采用5分法?陀^評價通過信號噪聲比、對比度噪聲比進行分析。輻射劑量通過CT劑量容積指數(shù)(CTDIvol)、劑量長度乘積(DLP)、有效劑量(ED)進行評價,轉(zhuǎn)換系數(shù)為k=0.014mSv mGy-1cm-1。 結(jié)果 100kV管電壓、1000mAs管電流掃描模式的下圖像質(zhì)量的客觀評價優(yōu)于較120kV管電壓、800mAs管電流掃描模式(mean SNR,36.65±2.95vs...
【文章頁數(shù)】:51 頁
【學位級別】:碩士
【文章目錄】:
FOREWORD
Abstract
中文摘要
ABBREVATIONS AND SYMBOLS
1 Introduction
1.1. Coronary Heart Disease (CHD)
1.2. Epidemiology of CHD
1.3. Diagnosis of CHD by Coronary CTA
1.4. Disadvantages of coronary CTA
1.5. Methods for reduction of high radiation dose
2 Literature Review
3 Materials and Methods
3.1. Study population
3.2. Preparation of the patient
3.3. Image Acquisition
3.3.1. Scanner 256-slice CTCA
3.3.2. Contrast Material
3.3.3. Injection Protocol
3.3.4. Acquisition Protocol
3.3.5. Image Reconstruction
3.3.6. Post processing and Image Analysis
3.4. Effective Dose Calculation
3.5. Statistical analysis
附圖表
4 Results
4.1. Demographic Study of Patients
4.2. Image quality of coronary arteries
4.2.1 Objective Image Quality
4.2.2. Subjective Image Quality
4.3. Estimated Radiation Dose
5 Discussion
6 Limitation of study
7 Conclusion
References
SELF INTRODUCTION
ACKNOWLEDGEMENTS
本文編號:3896622
【文章頁數(shù)】:51 頁
【學位級別】:碩士
【文章目錄】:
FOREWORD
Abstract
中文摘要
ABBREVATIONS AND SYMBOLS
1 Introduction
1.1. Coronary Heart Disease (CHD)
1.2. Epidemiology of CHD
1.3. Diagnosis of CHD by Coronary CTA
1.4. Disadvantages of coronary CTA
1.5. Methods for reduction of high radiation dose
2 Literature Review
3 Materials and Methods
3.1. Study population
3.2. Preparation of the patient
3.3. Image Acquisition
3.3.1. Scanner 256-slice CTCA
3.3.2. Contrast Material
3.3.3. Injection Protocol
3.3.4. Acquisition Protocol
3.3.5. Image Reconstruction
3.3.6. Post processing and Image Analysis
3.4. Effective Dose Calculation
3.5. Statistical analysis
附圖表
4 Results
4.1. Demographic Study of Patients
4.2. Image quality of coronary arteries
4.2.1 Objective Image Quality
4.2.2. Subjective Image Quality
4.3. Estimated Radiation Dose
5 Discussion
6 Limitation of study
7 Conclusion
References
SELF INTRODUCTION
ACKNOWLEDGEMENTS
本文編號:3896622
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