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Optimization and Clinical Application of Image Process Parameters of Digital Radiography

Author: HouLiXia
Tutor: XieJinDongï¼›WangPengCheng
School: Taishan Medical College
Course: Medical Imaging and Nuclear Medicine
Keywords: Image quality factor Digital X-ray photography After processing parameter optimization
CLC: TP391.41
Type: Master's thesis
Year: 2009
Downloads: 46
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Abstract


The purpose of the use of factorial design method of digital X-ray lumbar photography post-processing parameters on the quality of the image . Asked the rational allocation of processing parameters , so as to ensure the quality of the image , effectively reduce the effective dose of the patient , and optimization scheme of phantom Monte Carlo procedures and clinical validation . Materials and methods by adjusting the parameters of the post-processing of Philips DR system workstation of CDRAD2.0 phantom imaging , medical monitor evaluation of image quality . Dosimeters monitoring phantoms of Solidose surface entrance dose , analysis of the results of the study , summed up the post-processing parameter optimization program ; phantom Finally, the effect of dose optimization program optimization , Monte Carlo procedures and clinical validation . Results (1) by 25 - analysis due the tube voltage 70kVp experimental knowledge in the clinical use of , post-processing parameters affect the image quality is the DCE, UM and UMK (P lt; 0.0001). With the UM an increase the IQF corresponding increase , the UMK and the DCE to increase the lead to the IQF reduce . ( 2 ) changing the tube voltage regulation DCE, UM and UMK, found the same post-processing parameter settings , the tube voltage is increased , the image quality is lower ( t = 5.31 , P = 0.0001 ) . Moderate the DCE UM with a big the UMK joint can improve image quality . (3) changing the tube voltage, the adjustment NC, UM and UMK , UM, the UMK and NC apparent between the three-way interaction of that interaction between UM and UMK is more evident in a low level on the NC . IQF essentially unchanged ( 4 ) the use of abdominal phantom validate , optimize program of ESD decline can reach 50% ; using a Monte Carlo procedure to verify the effective dose of systemic organ decreased by 30% ; clinical validation via VGA ratings indicate that the quality of the images obtained by the use of dose optimization program with default image quality , and can effectively reduce the effective dose of the patients received no significant difference up to 20 % to 30% . Conclusion factorial experiment can be used for radiology , a result of the combined effect of a number of factors , the factorial experiment is a very useful experimental design tools . Rational use of the processing parameter optimization program can guarantee the image quality, does not affect the premise of the clinical diagnosis , and the irradiation dose of the patient is greatly reduced by increasing the tube voltage .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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