The Application Of The Best Single Energy Imaging Of Dual-energy CT In The Head And Neck CTA

Objective:To discuss the application value and radiation dose in the best single energy imaging of dual-energy CT in the head and neck CTA inspection.Materials and Methods:This study adopts the method of retrospective analysis, collecting the imaging information of30patients with head and neck CTA in the dual-energy CT in the General hospital of Tianjin Medical University, using the GSI viewer software to measure the CT value and SD of the middle cerebral artery and its surrounding parenchymal without blood vessels. By using the spectrum software to measure the keV of the best image contrast to noise ratio (CNR) automatically, to compare the imaging of this keV with the imaging of30patient who used the traditional64series line row helical CT in head and neck CTA, and then to compare the radiation dose of the two check. The imaging of all the patients obtained cross-sectional images, and to rebuild VR and MPR images. Quantitative and qualitative analysis of image were performed, and radiation dose was recorded. The parameters of quanlitative analysis included intraluminal attenuation of artery (CT value), signal-to-noise ration (SNR) and contrast-to-noise rate (CNR).The quanlitative analysis of image quality used4-point grade for cross-section images (1, poor;2, satisfied;3, good;4, excellent) and3-point grade for VR and MPR images (1, poor;2, satisfied;3, excellent).Radiation dose included CT dose index-volume (CTDIVOl), dose length product (DLP) and effective dose (ED). The methods of statistics analysis adopt double sample t test, and P<0.05represented the significant difference.Results:The range of the best single energy of the dual-energy CTA is61-72keV, with an average of65.5±3.0keV. at this point the image best CNR is14.2-34.17, with an average of22.12+5.52. Compared with the imaging of the traditional64row spiral CTA, the result of the intraluminal attenuation of artery (CT value), SNR and CNR has no significant statistical difference (P>0.05).The quality of the cross-sectional, VR and MPR images has no significant statistical difference (P>0.05). The radiation dose of the patients accepted, including volumetric CT dose index (CTDI vol), the product of dose length (DLP) and the effective dose (ED) have significant statistical significance (P<0.05).Conclusions:The best single energy imaging of dual-energy CT can be used for head and neck CTA examination, and its image can satisfy the requirements of clinical diagnosis, also can reduce the patient radiation dose at the same time.