Evaluation of CT Brain Protocols, Image Quality and Radiation Dose

Abstract CT scan is one of the most valuable tools used in the centers of modern health care and are accompanied by radiation dose greater than that of the normal radiographic and must be therefore use carefully to protect patients from radiation. The aim of this study to compare between radiation dose and image quality and to compare between CT brain protocols and radiation dose . Random samples consist of 30 patients who underwent CT brain examination. The patients data registered(age, gender, exposure factors(kv, mAs, exposure time, slice thickness, No of slices) and the DLP, CTDI. where the distribution of the patients was 13 women and 17 male, ages from 6 months to 70 years. The study group has been taken from Modern medical center, Alzaytouna specialist hospital and the Advanced diagnostic center, samples of the population from Khartoum - Sudan. Study was conducted in the period from October 2013 to February 2014 where the study showed that the radiation dose generally increase with intensity of the current, exposure time, the thickness of the slice and the number of slices, also study showed that the image quality increases with radiation dose, However the study showed there is an existence of images with good to very good in quality in less radiation dose . The artifacts generally increases as the exposure time increase and has a close association with movement of the patient. where the study showed that the radiation dose generally increase with mAs, scan time, slice thickness and the number of slices and showed that the image quality increases with radiation dose, However there is an existence of 20% of mages having acceptable, good and very good in quality when we reduce the radiation dose to the half . Also The study showed that artifacts generally increases as the exposure time increases and has a close association with movement of the patient.

List of Contents

Subject Page No.

I الآیة

Dedication II

Acknowledgment III

Abstract IV

V ملخص البحث

Abbreviations VI

List of content VIII

List of table IX

List of Figures X

Chapter one

Introduction

1.1 historical backgrounds 1

1.2 Objectives of the study 3

1.3 Problem of the study 3

Chapter two

Theoretical background

2.1 CT back ground 4

2.2 CT physical principles 18

2.3 Radiation Doses from CT Scans 55

2.4 Brain anatomy 66

2.5 CT brain protocols 84

2.6 Previous study 94

Chapter three

Material and method

3.1 Material 95

3.2Method 95

Chapter four

Results

4.1 general characteristics of the sample studied 97

4.2 cross tabulation 99

Chapter Five

Discussion and conclusion

5.1Discussion 108

5.2Conclusion 108

5.3Recommendations 109

References 110

Appendix