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- W2364830180 abstract "Purpose: To know the relative influence with CT value in CT scan; discussing the error of the CT reconstruct image with different scan parameters; to discuss the several question of quality assurance of CT value and image using by three dimension treatment planning system. Materials and Methods: Set different scan voltage and current to Siemens Somatom Plus4 helical CT- measured the different material density relative to CT value with the Gammex 467 phatom-.Measured the effect of the CT value when the phatom in different position of CT and the high density material of CT bed.Measured the CT value relative the density of the water including the different density contrast dose. Estimated the referent dose influence of the patient of Nasopharyngeal carcinoma who added the contrast dose.Scan a phatom including a air cavity- change the scanning slice thickness and pitch- checked the difference of the reconstruct CT image with the real size. Checked the image inputting and outputting of the using digital board and printers. Checked the registering and output of the information of the words and images of the system. Results: Give the relative curve of the CT value with the different scan voltage and current; Gived the result of CT bed and contrast dose influencing the CT value; the scan result of the phatom indicated that the shape of the air cavity in the CT image change because of part volume effect and ladder artifact. Other none-dose quality assurance had performed before using the treatment planning system. Conclusion: Inputting the correct density-CT value is one condition of right dose calculation; to know the error of CT image can reduce the error when drawing the outline of target.The three dimension treatment planning system before using need detail quality assurance." @default.
- W2364830180 created "2016-06-24" @default.
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- W2364830180 date "2003-01-01" @default.
- W2364830180 modified "2023-09-23" @default.
- W2364830180 title "To discuss several question of quality assurance of CT value and image using by treatment planning system" @default.
- W2364830180 hasPublicationYear "2003" @default.
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