Abstract
Comparing the single spiral CT images and multi-slice CT images, analyzing the cause of artifacts that appeared in the CT images, this study aims to contribute to the convenience of the doctor's diagnosis . Through analyzing the patient CT image artifacts, we find the artifacts are produced mainly from two aspects. One comes from equipment itself, then the other one caused by patients themselves. Using the corresponding method, the artifacts could be minimize or be avoid effectively. Especially introduced the solution of mental artifacts, which expect to make a difference in improving the image quality and doctors diagnosis .
Highlights
X-ray Computed tomography(CT) has been successfully widely used since the 1970s, its structure and properties have been perfected and improved
Spiral CT divide into single spiral CT and multislice spiral CT according to the different scanning way.Single spiral CT scanning parameters similar to ordinary CT, X-ray tube voltage is 80kV to 140kV; X-ray tube current is 50mA to 450mA; the longest scanning time can expose 100 seconds continuously;when scanning,X-ray beam width determined by the collimated width,the thickness is 1mm to 10mm, the moving speed of examining table is 1 mm/s to 20 mm/s, X-ray tube rotated 360 degrees cost for 1 second commonly.At the end of 1998, multislice CT scan technology started in the clinical application which is a new technology in the development of spiral CT
Artifacts arise because some parts of individual projection can be very noisy due to insufficient photons passing through widest part of patient.In the process of CT image preprocessing, projection noise is inversely proportional to the measured photon, the fewer photons,the more the noise.When these projects are reconstructed by standard algorithm of scanner, the noise is magnified
Summary
X-ray Computed tomography(CT) has been successfully widely used since the 1970s, its structure and properties have been perfected and improved. Many generations of CT scanners have been designed to improve their geometrical aspect and to reduce the scanning time. Spiral CT divide into single spiral CT and multislice spiral CT according to the different scanning way.Single spiral CT scanning parameters similar to ordinary CT, X-ray tube voltage is 80kV to 140kV; X-ray tube current is 50mA to 450mA; the longest scanning time can expose 100 seconds continuously;when scanning ,X-ray beam width determined by the collimated width,the thickness is 1mm to 10mm, the moving speed of examining table is 1 mm/s to 20 mm/s, X-ray tube rotated 360 degrees cost for 1 second commonly.At the end of 1998, multislice CT scan technology started in the clinical application which is a new technology in the development of spiral CT. Following the advance of computer technology, CT can be touched maximum of 64 slices scanning.Multi-slice spiral CT refers to the spiral CT equipment which installated more rows detector, X-ray tube rotating one week,can complete the multifaceted volume data acquisition and reconstruction of multiple levels of the image.X-ray tube voltage is 120kVto 140 kV; X-ray tube current is 250mA to 600 mA; the longest scanning time can expose continuously 125seconds to 135 seconds.Spiral CT provides a continuous gantry rotation and a continuous table motion as gantry rotates[1].So each view is at different table position and no interscan delay is needed.Comparing with the single spiral CT, multi-slice spiral CT has several advantages,scanning time speed faster,image of spatial resolution more enhancement, perspective of CT positioning more accurate, utilization rate of X-ray more efficient.In spite of these new technologies, artifacts still persist in spiral CT.Artifacts degrade the CT image quality enormously so that the physicians are not able to give a reliable diagnostic because the anatomies are completely distorted or hidden
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
