tailieunhanh - Ebook Cone beam computed tomography: Part 2

(BQ) Part 2 book "Cone beam computed tomography" presents the following contents: Multidetector row CT, cone beam micro-CT for small-animal research, cardiac imaging, C-arm CT in the interventional suite - Current status and future directions,. | Applications 11 Multidetector row CT Xiangyang Tang Contents Introduction 151 Fundamentals of physics in CT imaging 152 System architecture of MDCT 153 Data acquisition in MDCT 153 Imaging performance in MDCT 154 Contrast resolution 154 Spatial resolution 154 Temporal resolution 155 Energy resolution 155 Image reconstruction in MDCT 156 Image reconstruction solutions in 4-detector row CT 156 Axial scan 156 Spiral helical scan 156 Image reconstruction solutions in 16-detector row CT 157 Axial scan 157 Spiral helical scan 157 Image reconstruction solutions in 64-slice CT and beyond 158 Axial scan 158 Spiral helical Scan 159 Recent advancements in MDCT technology 159 Up-sampling to suppress craniocaudal aliasing artifacts 159 Dual-source dual-detector to double temporal resolution for cardiovascular imaging 160 Dual peak voltage dual-kVp scan for material di erentiation with energy resolution 161 Separation between material atomic number and mass density 162 Material decomposition 163 Reduction of noise and radiation dose 164 Clinical applications of MDCT 165 Radiation dose in MDCT 165 Discussion 166 Acknowledgments 168 References 168 INTRODUCTION Since its advent in the early 1970s x-ray computed tomography CT has advanced substantially in every aspect of its capability for clinical applications with the most remarkable advancement being made in its speed of data acquisition and image generation. In the early days approximately 5 min was needed in a first-generation CT scanner to acquire a full set of data for the generation of one single image slice. Nowadays on average fewer than 5 ms is needed in state-of-the-art multidetector row CT MDCT scanners to acquire the data for generating one image slice. Note that this is a 60 000 5 X 60 5 1000 60 000 -fold increase in