비스무스를 이용한 방사선 피폭 감소 및 화질 연구
Radiation Exposure Reduction and Image Quality Study Using Bismuth
초록/요약
By applying an ergonomically developed Bismuth shield to the, endovascular treatment of cerebral aneurysm the radiation dose of the scalp and lens from the medical radiation exposure was reduced. The enrtance surface dose was analyzed by measuring the occipital parts, bilateral temporal parts, bilateral quadriceps, and nasal tip of the developed bismuth shield using a photostimulable fluorescence dosimeter before (Group A) before use (Group B). Signal to noise ratio (SNR) and contrast to noise ratio (CNR) analysis were used to evaluate the image quality when Bismuth shielding was used. The mean entrance surface dose of A group and B group was 26.92% lower than that of A group. The analysis of CNR and SNR was the same for both Roadmap and DSA. The use of Bismuth shielding is an alternative that can reduce the radiation impairment due to temporary hair loss and other stochastic effects that may occur after cerebrovascular intervention.
more목차
1. Introduction 1
2. Related Studies 5
2.1. Cerebral Angiography and Neurointerventional Radiology 5
2.1.1. Cerebral Angiography 5
2.1.2. Neurointerventional Radiology 12
2.2. Overview and Diseases of Cerebral Aneurysms 15
2.2.1. Angiography of Cerebral Aneurysms 17
2.2.2. Ruptured Cerebral Aneurysm 19
2.2.3. Unruptured Cerebral Aneurysm 22
2.3. Dose Management of Cerebrovascular Interventions 24
2.3.1. Purpose of Radiation Protection 24
2.3.2. Protection Principles of External Exposure 24
2.3.3. Effect of Radiation on the Human Body 26
2.3.4. Characteristics of Fluoroscopy Radiation Exposure 31
2.3.5. Radiation Dosimetry Method Interventional Procedures 35
2.4. SNR and CNR 39
2.4.1. Signal to Noise Ratio 39
2.4.2. Contrast to Noise Ratio 40
3. Measurement target and method 41
3.1. Measurement targets and devices 41
3.1.1. Self-developed bismuth shield 42
3.1.2. X-ray generator test conditions 45
3.1.3. Dose measurement tools and devices 47
3.2. Measurement of entrance surface dose and image analysis 49
3.2.1. Measurement of entrance surface dose 49
3.2.2. Relative organ dose Conversion 54
3.2.3. Paired t-Test Statistical Analysis 55
4. Image Analysis for Image Quality 56
4.1. Experiments on Image Analysis 56
4.1.1 CNR & SNR Measurements 58
4.1.2. π view star grayscale comparison 59
4.1.3. Paired t-Test Statistical Analysis 61
5. Results and discussion 62
5.1. Dose measurement results and statistical analysis 62
5.2. Image Analysis Results and Statistical Analysis 70
5.3. Discussion 73
6. Conclusion 78
REFERENCE
ABSTRACT (Korean)
