title: Accuracy of computed tomography attenuation measurements for diagnosing anemia.
abstract: OBJECTIVE
  The purpose of this study was to determine which computed tomography (CT) attenuation parameter was the most appropriate to predict the presence or severity of anemia.
  
  
  METHODS
  The subjects of the study wer 500 patients who had undergone a peripheral blood examination within 24 h of an unenhanced CT scan. Regions of interest were placed in the left ventricular (LV) cavity, thoracic and abdominal aortic lumens, inferior vena cava, and interventricular septum. The CT attenuation difference between the LV cavity and interventricular septum was also calculated. The relation between these measurements and the blood hemoglobin level was analyzed. In addition, using several selected parameters, a receiver operating characteristic (ROC) analysis was also performed.
  
  
  RESULTS
  The difference in CT attenuation between the LV cavity and interventricular septum revealed the greatest correlation. ROC analyses also revealed the greatest area under the ROC curve in the differences between CT attenuation.
  
  
  CONCLUSIONS
  The best quantitative method for the diagnosis of anemia was the difference in CT attenuation between the left ventricle and interventricular septum.
authors.affiliation: Department of Radiology, Graduate School of Medical Sciences, The University of Tokushima, Tokushima, Japan.
authors.forename: Hai
authors.initials: H
authors.lastname: Lan
authors.forename: Sadamitsu
authors.initials: S
authors.lastname: Nishihara
authors.forename: Hiromu
authors.initials: H
authors.lastname: Nishitani
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000740:Anemia / Q000175:diagnosis*; D001027:Aortography / Q000379:methods; D002648:Child; D002675:Child, Preschool; D003937:Diagnosis, Differential; D005260:Female; D006352:Heart Ventricles / Q000000981:diagnostic imaging; D006454:Hemoglobins / Q000032:analysis; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000379:methods; D007223:Infant; D008297:Male; D008875:Middle Aged; D011237:Predictive Value of Tests; D012372:ROC Curve; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012720:Severity of Illness Index; D014057:Tomography, X-Ray Computed / Q000379:methods*; D014682:Vena Cava, Inferior / Q000000981:diagnostic imaging; D054088:Ventricular Septum / Q000000981:diagnostic imaging; D055815:Young Adult
chemical_list: D006454:Hemoglobins