Diagnostic value of CT target scanning combining with changing position for pulmonary nodule in special location / 实用放射学杂志

ABSTRACT

Objective To evaluate the diagnostic value of CT target scanning combining with changing position for pulmonary nodules in special location .Methods CT target scanning combining with changing position was performed in 22 patients with pulmo‐nary nodules adjacent to heart or in posterior costophrenic angle ,which were found with routine spiral CT scanning .For objective analysis , the signal‐noise‐ratio (SNR) and contrast‐noise‐ratio (CNR) of lung were calculated .In terms of subjective assessment ,the image quality was rated on a 3‐point scale (0-2) for pulmonary inflation ,gravity‐dependent pulmonary perfusion and severity of artifacts , respectively .The CT features of pulmonary nodules were compared between different scanning techniques .Moreover ,the diagnostic confidence for pulmonary nodules was evaluated .The paired t test ,Wilcoxon signed‐rank test and Kappa test were used for statisti‐cal analysis .Results In comparison with conventional spiral CT scanning ,CT target scanning combining with changing position im‐proved the subjective image quality scores (P<0 .01) ,increased the signal‐to‐noise ratio (SNR) and contrast‐to‐noise ratio (CNR) , showed more detailed CT features (P<0 .05) ,and improved the confidence of diagnosis (P<0 .01) .Conclusion CT target scanning combining with changing position technique can show detailed features ,which should be recommended as the optimal scanning tech‐nique for pulmonary nodules adjacent to heart or in posterior costophrenic angle .