title: Assessment of liver fat in an obese patient population using noncontrast CT fat percent index.
abstract: OBJECTIVE
  To develop a simplified method to quantify liver fat using computed tomography (CT) fat % index (CTFPI) compared to liver spleen method (CTL/S, CTL-S).
  
  
  METHODS
  Noncontrast CT of the liver was performed in 89 patients (overweight, obese, severely obese) to quantify fat, using the following: CTFPI=[(65-patient HU)/65]×100, normal live r=65 HU.
  
  
  RESULTS
  There was a strong linear correlation between CTFPI and the standard method of assessing liver fat using CTL/S (r=-0.901), CTL-S (r=-0.911). Hepatic HU and CTFPI were significantly different in the severely obese group compared to other two groups (P<.05).
  
  
  CONCLUSIONS
  Significant correlation indicates equal diagnostic accuracy of the two methods in appropriately calibrated scanners.
authors.affiliation: Department of Radiology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
authors.forename: Ali F
authors.initials: AF
authors.lastname: Jon
authors.affiliation: Department of Radiology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
authors.forename: Ahmad R
authors.initials: AR
authors.lastname: Cheema
authors.affiliation: Department of Radiology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
authors.forename: Atif N
authors.initials: AN
authors.lastname: Khan
authors.affiliation: Department of Radiology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
authors.forename: Vassilios
authors.initials: V
authors.lastname: Raptopoulos
authors.affiliation: Department of Radiology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
authors.forename: Thomas
authors.initials: T
authors.lastname: Hauser
authors.affiliation: Department of Radiology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
authors.forename: Imad
authors.initials: I
authors.lastname: Nasser
authors.affiliation: Department of Radiology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
authors.forename: Francine K
authors.initials: FK
authors.lastname: Welty
authors.affiliation: Department of Radiology, University of Massachusetts Medical School, Worcester, MA, USA.
authors.forename: Andrew
authors.initials: A
authors.lastname: Karellas
authors.affiliation: Department of Radiology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA. Electronic address: mclouse1@bidmc.harvard.edu.
authors.forename: Melvin E
authors.initials: ME
authors.lastname: Clouse
mesh_terms: D000368:Aged; D005223:Fats / Q000032:analysis*; D005234:Fatty Liver / Q000000981:diagnostic imaging*; D005260:Female; D006801:Humans; D008099:Liver / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000000981:diagnostic imaging*; D014057:Tomography, X-Ray Computed / Q000379:methods*
chemical_list: D005223:Fats
keywords: Fat percent index; Hepatic steatosis assessment; Metabolic syndrome; NASH; Noncontrast CT; Obesity