TU‐A‐201B‐03: Dose Reduction and Image Quality Benefits Using Model Based Iterative Reconstruction (MBIR) Technique for Computed Tomography

摘要: Purpose: To demonstrate the image‐quality benefits and potential for significant dose reduction with Model‐Based Iterative Reconstruction (MBIR) technique incorporating physical model of computed tomography(CT) systems. Method Materials: A based iterative reconstruction (MBIR), a maximum posteriori (MAP) estimate edge‐preserving prior, has been developed x‐ray CTimage reconstruction. It utilizes more accurate imaging chain accounting system‐optics, noise non‐idealities in data, hence improves image quality compared to conventional filtered backprojection (FBP) at significantly reduced levels. In this work, GE multi‐slice CT system was used acquire set multi‐dose data standard FBP For resolution assessment, Catphan600® phantom scanned three levels (40, 20, 10 mGy 120kVp spectrum), images were reconstructed using two methods: ASiR, MBIR. artifact evaluations, an anthropomorphic abdomen (Kyoto Kagaku Co., Ltd) four (120kVp spectrum 225, 112, 54, 27 mAs), comparative study between MBIR slice multi‐planar reformat (MPR) modes made. addition, few clinical case studies also compare performance actual data. Results: From study, we found that even 1/4th dose, have improved state‐of‐the‐art ASiR. Use ASIR provides up 50% equivalent image‐quality. phantom, below 1/8th outperformed corresponding both, MPR modes, demonstrating immense reduction, yet quality, CT.Conclusion: Results method demonstrated improvements CT.