title: [Validation of dark band artifact reduction using artifact reduction processing methods with low-dose CT images: phantom study].
abstract: OBJECTIVE
  The purpose of this study was to validate the reduction of dark band (DB) artifact using iterative reconstruction (IR) of abdomen CT.
  
  
  METHODS
  Phantoms were arranged with and without small phantom assuming arm position at the body side (Phantom-A, -B). Image reconstruction methods were derived by the following four methods: filtered back projection (FBP), IR [adaptive iterative dose reduction using three-dimensional processing: AIDR-3D (MILD)], organ specific reconstruction (OSR), and Boost-3D (Boost). We evaluated DB artifact with CT values, standard deviation (SD) values, and profile curves using the four reconstruction methods.
  
  
  RESULTS
  CT values of artifact decreased with low tube current in Phantom-A. CT values of artifact were significantly increased (15-23 HU) in OSR and Boost compared to FBP and MILD (Phantom-A). SD values of artifact improved by IR method. However, IR method was not improved to CT values decreased by artifact (Phantom-A). CT values were not changed by the difference in image reconstruction methods in Phantom-B.
  
  
  CONCLUSIONS
  IR method has an effect to reduce statistical noise, but reduced the CT value for DB artifact. On the other hand, the OSR and Boost methods are effective for the improvement of CT value in the DB artifact.
authors.affiliation: 1. Program in Health and Welfare Graduate School of Comprehensive Scientific Research, Prefectural University of Hiroshima, 2. Department of Radiology, Kurashiki Central Hospital.
authors.forename: Masaaki
authors.initials: M
authors.lastname: Fukunaga
authors.forename: Hideo
authors.initials: H
authors.lastname: Onishi
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Yamamoto
mesh_terms: D000005:Abdomen; D016477:Artifacts; D006801:Humans; D007091:Image Processing, Computer-Assisted; D019047:Phantoms, Imaging; D011829:Radiation Dosage; D011860:Radiography, Abdominal; D059629:Signal-To-Noise Ratio; D014057:Tomography, X-Ray Computed / Q000295:instrumentation* / Q000379:methods*