title: A Newly Developed Shear Wave Elastography Modality: With a Unique Reliability Index.
abstract: OBJECTIVE
  The aim of this study was to prospectively assess the usefulness of the reliability index, namely the percentage of the net amount of effective shear wave velocity (VsN).
  
  
  METHODS
  One hundred and sixty-eight patients with chronic liver disease, who underwent ultrasound elastography, were consecutively enrolled. Shear wave measurement (SWM), FibroScan, virtual touch quantification, and shear wave elastography were performed for all patients, and the variations in the measurement results were compared with VsN. The absolute average value of the difference between SWM_Vs and Vs measured using other elastography devices is termed |ΔVs|. VsN was classified into three groups: ≥50, <50, and 0 (failure measurement). In these groups, there was a significant difference in abdominal circumference, body mass index, the distance between the ultrasound probe surface and the liver, and |ΔVs|. When the distance between the ultrasound probe surface and the liver was >2 cm, VsN tended to be significantly lower (p < 0.001).
  
  
  RESULTS
  When VsN was <50, |ΔVs| became high, and there was variation in the results between each device.
  
  
  CONCLUSIONS
  The results of this study show that VsN is a useful value to decide whether Vs is appropriate or not.
authors.affiliation: Department of Gastroenterology and Hepatology, Faculty of Medicine, Kinki University, Osaka-Sayama, Japan.
authors.forename: Norihisa
authors.initials: N
authors.lastname: Yada
authors.forename: Toshiharu
authors.initials: T
authors.lastname: Sakurai
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Minami
authors.forename: Tadaaki
authors.initials: T
authors.lastname: Arizumi
authors.forename: Masahiro
authors.initials: M
authors.lastname: Takita
authors.forename: Satoru
authors.initials: S
authors.lastname: Hagiwara
authors.forename: Kazuomi
authors.initials: K
authors.lastname: Ueshima
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Ida
authors.forename: Naoshi
authors.initials: N
authors.lastname: Nishida
authors.forename: Masatoshi
authors.initials: M
authors.lastname: Kudo
mesh_terms: D002908:Chronic Disease; D003430:Cross-Sectional Studies; D054459:Elasticity Imaging Techniques / Q000379:methods*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007089:Image Enhancement; D007090:Image Interpretation, Computer-Assisted / Q000379:methods; D008107:Liver Diseases / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D009367:Neoplasm Staging; D011379:Prognosis; D015203:Reproducibility of Results