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Item Information   Holdings       More by this author     Faessler, Shawn P.     Subjects     Tomography     Radiography, Medical -- Image quality     Gantries.     Motion     Monte Carlo method -- Computer programs.     MSE Project.     Browse Catalog     by author:      Faessler, Shawn P.       by title:      Computed tomography ...         MARC Display

Computed tomography gantry balance, motion, and image quality / by Shawn P. Faessler. by Faessler, Shawn P. Subjects Tomography   Radiography, Medical -- Image quality   Gantries.   Motion   Monte Carlo method -- Computer programs.   MSE Project. Description:  57 leaves : ill. ; 29 cm. Contents:  Advisor: Dr. Lisa Milkowski. Committee members: Dr. Kishore Acharaya, Dr. Vincent Canino. Background information -- Methods (Theoretical and Experimental) -- Results -- Discussion -- Conclusions -- References. The purpose of this project is to understand and control motion of a CT gantry to minimize degradation of the CT image throughout a product's life. This project quantifies the relationship of gantry imbalance, structural stiffness, and motion. Gantry imbalance was predicted with a Monte Carlo simulation of mass and CG differences in the replaced components. The motion due to imbalance was predicted using analyzed values of structural stiffness. The predicted motion was confirmed experimentally by varying imbalance and measuring the motion. Motion artifacts were validated by adding imbalance to a CT scanner and showing that the added motion created an image artifact. The results of this study show the relationship between imbalance, motion, and artifacts. Gantry motion is a linear function of imbalance. The type of imbalance determines the type of motion. These motions can create image artifacts. Imbalance (and motion) can be controlled by implementing a balancing process and/or controlling the component variations that cause imbalance. These results can be applied to prevent motion related artifacts.   Copy/Holding information Location Collection Call No. Status   Walter Schroeder Library Master's Theses AC805 .F335 2002 Available Add Copy to MyList Format: HTMLPlain textDelimited Subject:   Email to:

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