Diagnostic value of spectrum CT volume helical shuttle technology in detection of pulmonary arteriovenous malformations / 实用放射学杂志

ABSTRACT

Objective To access the diagnostic value of volume helical shuttle (VHS)technology of spectrum CT in detection of the pulmonary arteriovenous malformations (PAVM).Methods Thirteen patients with PAVM confirmed by surgery and clinical data underwent CT pulmonary artery angiography with VHS technology,which were regarded as group A.The consecutive images at four different phases were gotten Meanwhile,other thirty patients underwent conventional CT pulmonary artery angiography using bolus tracking scan,regarded as Group B.The enhancement degrees of the pulmonary trunk were measured,and the image quality was also subjectively assessed by two radiologists separately,which were compared between two groups.Results In group A,the proportion of optimal phase in each of the four phases was 15.38% (2/13),46.15% (6/13),30.77% (4/13)and 7.7% (1/13),respectively.The mean CT value in pulmonary trunk was (329.21±41.63)HU in group A and (281.74±49.83)HU in group B,exhibiting no difference (P =0.989). The percentage of enhancement degree of pulmonary trunk more than 300 HU in group A was more than that in group B (P=0.000).However, the image quality of the main pulmonary artery,lobar pulmonary artery or segmental pulmonary artery was not significantly different between two groups (P >0.05).There were no statistically differences in mean DLP between group A of (715.54±195.37)mGy/cm and group B of (558.36±186.81)mGy/cm (t=3.737,P=0.068).Conclusion Spectrum CT VHS with higher image quality and enhancement degree is superior to conventional CT scan,which can be used to reduce the influence of individual circulation difference on image quality.