The study of dual energy spectral CT on the image quality of hand tendons / 实用放射学杂志

Objective To evaluate the image quality of hand tendons by using spectral CT,compared with conventional CT ima-ges.Methods Forty patients scanned with spectral CT were enrolled.The 65keV of optimal contrast-to-noise ratio (Optimal CNR) for viewing hand tendons was selected.The image quality of monochromatic GSI images (65 keV)and conventional CT images were compared with two different methods including subjective method and objective method by two radiologists respectively.Results In subjective method,the image quality in GSI images was superior to conventional CT images (P <0.05).And in objective method, the beam-hardening artifacts in the phalanges of fingers space were reduced markedly with hand tendons displaying more clearly in GSI images (P <0.05 ).There was no significant difference between the two radiologists in both methods with good correlation (Kappa=0.75,Kappa=0.85).Conclusion Spectral CT with the optimal 65keV monochromatic images could reduce the artifacts and increase image quality significantly in hand tendons imaging.It might be a very useful supplementary imaging method in detec-ting tendon diseases in routine work.

Research on the parameter setting on multi-slice spiral CT scan infants with congenital heart disease / 中国医学装备

Objective: To discuss the methods and experience of 64-slice spiral CT which used in infant cases with congenital heart disease, to select the appropriate scan parameters for reducing artifact and the radiation dose. Methods: Thirty-five cases with congenital heart disease were arranged CT examination by using Philips Brilliance 64-slice spiral CT scanner with Blous Tracking techniques. Results: All the images of the heart chambers, pulmonary artery, pulmonary vein, the ascending aorta and the descending aorta contrast agent filling showed good and had clear display. The density of superior vena cava is moderate. The various vascular CT value is approximate, no hardening artifacts. The atrioventricular of Cardiac and vascular of contrast agent filled fully and had clear boundary, no significant artifacts and no effect on the impact reconstruction. Conclusion: Appropriate adjustment of scanning parameters can reduce hardening artifact and the impact of artifacts. Following the principle of as low as reasonably achievable (ALARA) can obtain diagnostic images and reduce radiation damage to the infant.