Purpose : Our hospital’s CT examination rooms now have nine types of various equipment made by four different companies. Throughout the procedure, each of four different equipment had different CTDIvol values. One that had biggest difference among those equipment was high-quality equipment that represents video feed of data in a low dose Reconfiguration technology and this equipment was used during the process of repeating IMR (Iterative Model Reconstruction) and dose reduction effect of picture quality, which was applied on a paradigm shift to recognize the “change”.
Materials and Procedure : From August 14 to September 14 2015, 1842 people of males and females visited our hospital to take CT exams. Equipment that were used during the process were made by four different companies and people were tested by 9 different Equipment: PHILIPS company of iCT, Brilliance, Ingenuity, SIEMENS Corporation Definition, Definition Flash, Sensation, GE s Discovery, Ultra, TOSHIBA s Aquilion ONE. (1) Compare the CTDIvol values that were collected by 9 different equipment within a period, by checking the patient’s chest (CT Chest Routine), the upper and lower abdomen (CT Abdomen + Pelvis, CT Liver, CT Kidney), and the heart (Heart-EKG gated). (2) Compare the data that comes out when a patient is checked by different devices. (3) Compare the each noise values collected by devices that had the lowest integrity by using these methods: FBP (Filtered Back Projection), iDOS (Hybrid Iterative Reconstruction), and IMR (Iterative Model Reconstruction).
Results : (1) According to the result, one with the highest CTDIvol value was 10.1mGy and the lowest value was 0.8mGy. Also, an equipment with the highest integrity had CTDIvol value of9.9mGy, and an equipment with the lowest integrity had value of 1.2mGy. The DLP value of the equipment with the highest integrity was 619mGy during the dose Heart (Heart-EKG gated) test. On the other hand, one with the lowest integrity had the value of 251mGy. (2) When a patient was tested by various equipment, the highest CTDIvol value was 11.9mGy, and the lowest CTDIvol value was 5.6mGy. (3) When each equipment used the different data acquisition method, the SD average came out as this result: FBP collected 23.23mGy, iDOS collected 17.43mGy, and IMR collected 6.86 mGy.
Conclusion : The nine Equipment that had the lowest dose data acquisition method of the device showed an IMR (Iterative Model Reconstruction) is implementing a high-quality image even with no noise at very low doses, improving the low contrast resolution, radiation of a standard reconfiguration technology had the amount of 70% to 80% at the same time reducing the noise to improve the performance degradation that contrast 60 to 80% decrease in measurement. Technology with high image quality with Knowledge-based Iterative Model Reconstruction (IMR) would provide less radiation environment for the cancer patients and pediatric patients of tumors, whom had to take CT frequently during their lifetime. Furthermore, this technology will improve the nation’s medical expectancy and the quality of people’s life.
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