title: Simple single-section method for measurement of left and right atrial volumes with electron-beam CT.
abstract: OBJECTIVE
  The authors estimated left and right atrial volumes by using a simple method of measurement with nonenhanced electron-beam computed tomography (CT).
  
  
  METHODS
  One hundred sixty-four contrast material-enhanced electron-beam CT studies were divided into two groups. Group 1, which included 104 studies, was used to develop the measurement method (i.e., the formulas) for measuring left and right atrial volumes from a nonenhanced study. Group 2 consisted of 60 studies on which the validity of the method was tested. Measurement of left and right atrial volumes was performed on all section levels by tracing the respective atrial borders for each section, then multiplying the area by section thickness and summing the resultant volumes.
  
  
  RESULTS
  Calculated left and right atrial volumes were derived by using the biggest atrial area and cephalic-caudal span. The span was equal to section thickness times the number of sections in which the atria were present. Linear regression analysis formulas were acquired with the biggest atrial area and cephalic-caudal span. Left and right atrial calculated volumes were obtained with these formulas and demonstrated a significant good relation (r > .95, P < .001) and a difference of less than 11% (P < .05) in absolute values between measured and calculated volumes. Intraobserver, interobserver, and interstudy reproducibility were excellent, with less than 10% difference in absolute values.
  
  
  CONCLUSIONS
  Left and right atrial volumes can be accurately estimated from a single midventricular section by using nonenhanced electron-beam CT.
authors.affiliation: Saint John's Cardiovascular Research Center, Harbor-UCLA Medical Center Research and Education Institute, CA 90502, USA.
authors.forename: M J
authors.initials: MJ
authors.lastname: Budoff
authors.forename: S
authors.initials: S
authors.lastname: Mao
authors.forename: S
authors.initials: S
authors.lastname: Wang
authors.forename: H
authors.initials: H
authors.lastname: Bakhsheshi
authors.forename: B H
authors.initials: BH
authors.lastname: Brundage
mesh_terms: D019412:Anatomy, Cross-Sectional; D000784:Aortic Dissection / Q000000981:diagnostic imaging; D001014:Aortic Aneurysm / Q000000981:diagnostic imaging; D002303:Cardiac Output, Low / Q000000981:diagnostic imaging; D003287:Contrast Media; D003327:Coronary Disease / Q000000981:diagnostic imaging; D006325:Heart Atria / Q000000981:diagnostic imaging*; D006330:Heart Defects, Congenital / Q000000981:diagnostic imaging; D006801:Humans; D006976:Hypertension, Pulmonary / Q000000981:diagnostic imaging; D007091:Image Processing, Computer-Assisted / Q000379:methods; D016014:Linear Models; D015588:Observer Variation; D011856:Radiographic Image Enhancement; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000379:methods*
chemical_list: D003287:Contrast Media