The Research To Reduce Radiation Of Msct Urinary Tract Imaging Technology

Objective:In recent years, the urinary system imaging technology is constantly updated. MSCT urography is gradually become the most important method in the examination of urinary system diseases, due to its fast scanning speed, high image resolution, combined with powerful post-processing features. The traditional MSCT urinary imaging including four stages scanning, it can solve many clinical practical problems. However the fatal flaw is large scanning range, four or more stages. Patients who received may accept high radiation dose X-ray. The purpose of this study is to minimize the radiation dose through improve of scanning technology. This paper discusses the application of clinical disease diagnosis value.Methods:This research consists of three parts:1. The retrospective analysis of the various stages of kidney tumor lesions in scanning the diagnosis value. We collected38patients who have accept the traditional MSCT urinary examination and conformed by pathology after surgery and which including22males and18females, age15-88years, median age64years. Select three or two stages images for diagnosis and analyzed the diagnose value and compared the results with pathological results.2. The research of low dose scanning techniques in the MSCT urinary imaging. We select20patients in our hospital and group them into four groups. Each group uses different types of X-ray dose. Obtained image quality assessment, and each group were accepted by the X-ray radiation dose used for statistical comparison.3. Discusses the value of "separate bolus injection technique" for reducing the radiation dose on MSCT urinary imaging. We select10patients experience the scan of separate bolus injection technique on MSCT urinary imaging. Then we evaluated the image quality and analysis the clinical value.4. Statistical analyses were performed with free statistical software (SPSS17.0). For all statistical analyses, a value ofα=0.05was considered to indicate a significant difference.Results:1. The first part is the retrospective study. The comparative study included26cases of renal space-occupying lesions in patients with the image found that three stages images could make the results same as pathological diagnosis. So we can reduce one stage scan and reduce the X-ray radiation dose of at least25%. The second step a combination of three steps images for diagnosis, only17cases out of26cases of renal tumors can make a qualitative diagnosis, four cases of renal pelvis cancer,8cases of ureteral and bladder cancer are clear diagnosis. The third step by the two images are combined diagnosis, ureter and bladder cancer in8cases, all in compliance with the pathology, there are two cases of diagnostic error in the renal pelvis carcinoma, renal tumor only12cases of diagnosis pathology. For the cases of the disease, three period images and or two period images can make the same efficiency of qualitative diagnosis with complete phase4images. It may reduce the radiation dose with25%to50%.2. Low-dose scans the experimental part. Group one as the conventional dose group, the X-ray parameters for160Kv/120mAs image score of the five patients included in this group are five points, the patient accept CTPlvol average of11.574±0.36mGy.Group two set of images of X-ray parameters in the image of the120kv/120mAs included five patients in four cases up to4standard, only one cases score5points, the patient accept CTPlvol average of9.392±0.43mGy. Group three images argument80Kv/120mAs, the images of5patients with only two cases score4points, the other three cases are only3points standard the patients accept CTPlvol average of6.170±0.09mGy. Group four image X-ray parameters for40Kv/120mAs, including four cases of patients with an image score of3points, while one patient image score only2points, patients accept CTPlvol average of3.746±0.13mGy. Will be obtained CTPlvol data input SPSS17.0software of P=0.001, α=0.05test, that groups the difference between the number of statistically significant.3. Improved "separation Bolus. This study included10patients, respectively, renal and urinary tract system image quality score.10cases of patients with renal parenchyma image scores were more than2points, a total of nine cases of patients with urinary tract score more than2points, only one patient urinary tract system image score of1point. Two contrast agents were20ml and70ml, total dose of90ml, compared with the traditional four scans did not increase the dose of contrast agent.Conclusion:1. The first part retrospective study in traditional MSCT urinary imaging prove that there is no significant difference of the value between two stage urinary system imaging and the four stage imagines.2. The second part of low dose scanning experiments shows that reduce the scanning tube voltage value can be substantially less X-ray radiation patients receive. The results of this study a comprehensive evaluation of clinically recommended80KV tube voltage MSCT urinary tract imaging scan, the image quality of this condition has dropped somewhat, but the difference is difficult to distinguish by the naked eye, you need to rely on CT value comparison. And compared with conventional-dose X-ray radiation dose reduced about46.7%.3. The third part separate bolus injection technique can reduce scanning periods and the X-ray does on the premise of clinical application. Comprehensive information contained in, and reduces a scan, at least25%of the lower X-ray radiation.The three methods above respectively through different ways to reduce the X-ray radiation dose on the premise of clinical application.