Objective: To determine whether CT Scan can be applied in diagnosing the presence or severity of anemia.Methods:Totally 111 patients were underwent GE LightSpeed 64 layer spiral CT.The correlation between the CT value in the left ventricular(LV) cavity

right ventricular(RV) cavity

interventricular septum and arotic lumens and the blood hemoglobin level was analyzed. The relationship among aortic ring sign

interventricular septum high

intensity sign and anemia was identified.Results：Positive correlation was observed between the aortic CT attenuation values and the hemoglobin levels in the whole study population(P＜0.05).The ratio of the interventricular septum high density sign in the anemia group was much higher than that in the control group(50%vs.6%

P＜0.05). The ratio of the aortic ring sign in the anemia group was much higher than that in the control group(36.4%vs.6%

P<0.05).Conclusion:Using unenhanced thoracic CT scans to evaluate the anemia is available.The sign of decreased ventricle and aortic lumens density

aortic ring sign and interventricular septum high density are helpful in roughly judging the presence or absence of anemia and determining the hemoglobin level.