| Popis: |
The purpose of this study was to evaluate of resolution parameter and reconstitution filter in the 256 multi detector computed tomography(MDCT) by using the head phantom. We used 256 MDCT, and head phantom of philips system. We evaluated to image quality by using Extended Brilliance Workspace. The protocol were axial scan method with 120 kVp, 0.5 sec of rotation time, 5 mm of slice thickness and increment, 250 mm of field of view(FOV), of matrix size, 1.0 of pitch, mm of collimations. The resolution parameter was applied for `Standard`, `High` and `Ultrahigh`. The reconstitution filters were changed to seven type of `A`, `B`, `C`, `D`, `UA`, `UB`, `UC`. The assesment factors of image quality were the uniformity, the noise, the linearity and 50% and 10% of the modulation transfer function(MTF). Finally The good image quality in `High` resolution parameter showed at the uniformity, the linearity and 50% and 10% of MTF. The `UA`, `UB` reconstitution filter showed at the good image quality of the uniformity and the noise and `C` reconstitution filter showed at the same result of the linearity and 50% and 10% of MTF. |
