title: 3-dimensional adaptive raw-data filter: evaluation in low dose chest multidetector-row computed tomography.
abstract: OBJECTIVE
  To evaluate a 3-dimensional adaptive raw-data filter in reducing streak artifacts in low dose chest computed tomographic (CT) images.
  
  
  METHODS
  Fourteen adult patients who underwent low dose chest CT examination (parameters: 25 or 50 mAs, 120 kV) on 64-detector CTscanner were included in this study. We prepared 2 sets of contiguous 5-mm thick images by reconstruction with and without 3-dimensional adaptive raw-data filter (filter-processed and unprocessed images). Streak artifacts and visualization of peripheral vessels in both filter-processed and unprocessed images were evaluated using a 5-point scale. Upper, middle, and lower thorax were evaluated separately.
  
  
  RESULTS
  The difference in artifact severity was statistically significant in upper and lower thorax (P = 0.002 and 0.03, respectively), whereas it was not significant in middle thorax (P = 0.13). The difference in the visibility of peripheral pulmonary vessels was not statistically significant in all anatomical regions.
  
  
  CONCLUSIONS
  The 3-dimensional adaptive raw-data filter reduced streak artifacts in low dose chest CT in upper and lower thorax.
authors.affiliation: Department of Radiology, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA. tkubo@bidmc.harvard.edu
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kubo
authors.forename: Mizuki
authors.initials: M
authors.lastname: Nishino
authors.forename: Aya
authors.initials: A
authors.lastname: Kino
authors.forename: Norihiko
authors.initials: N
authors.lastname: Yoshimura
authors.forename: Pei-Jan Paul
authors.initials: PJ
authors.lastname: Lin
authors.forename: Masaya
authors.initials: M
authors.lastname: Takahashi
authors.forename: Vassilios
authors.initials: V
authors.lastname: Raptopoulos
authors.forename: Hiroto
authors.initials: H
authors.lastname: Hatabu
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016477:Artifacts; D005260:Female; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D008875:Middle Aged; D011829:Radiation Dosage; D013902:Radiography, Thoracic / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*