SwiftScan mode for improving SPECT quantitative accuracy and image quality:A phantom study
Objective To observe the value of Swift Scan mode for improving quantitative accuracy and image quality of SPECT.Methods A phantom model consisting 6 spheres(with diameter of 37,28,22,17,13 and 10 mm,respectively)was used,and 640 kBq/ml and 20 kBq/ml 99TcmO4-solution were perfused into the spheres and the phantom cavity,respectively.SwiftScan mode and conventional step and shoot mode SPECT images were acquired under 5,10 and 15 s/frame,respectively.The subjective imaging quality scores,and objective indexes of imaging quality,including coefficient of variation(CV),contrast-to-noise ratio(CNR),counts sphere(Csphere)and measurement quantification error percentage(Error％)were compared between different modes.Results Under 5,10 and 15 s/frame,the subjective imaging quality scores of SwiftScan mode were all higher than those of conventional step and shoot mode,and the maximum difference existed under 5 s/frame.Meanwhile,CV,CNR and Csphere of SwiftScan mode SPECT images were all better than those of conventional step and shoot mode under 5,10 and 15 s/frame(all P＜0.05).After excluding spheres with diameters of 10 mm and 13 mm,the Error％of SwiftScan mode SPECT images were better than that of conventional step and shoot mode under 5 s/frame and 10 s/frame(all P＜0.05),but no significant difference was found between 2 modes under 15 s/frame(all P＞0.05).Conclusion Under the same scanning time,especially short scanning time,the quantitative accuracy and imaging quality of SwiftScan mode SPECT were both better than those of conventional step and shoot mode SPECT images.
万方数据
维普
