title: [Evaluation of Resolution Correction in Single Photon Emission Computed Tomography Reconstruction Method Using a Body Phantom: Study of Three Different Models].
abstract: OBJECTIVE
  The aim of this study was to evaluate the resolution recovery techniques of Flash3D, Astonish, and Evolution in single photon emission computed tomography(SPECT) using a body phantom.
  
  
  METHODS
  We scanned a National Electrical Manufactures Association body phantom filled with 99mTc. The body of the phantom with radioactive sphere and background was filled with either water or radioactive solution. We investigated image quality using profile curves, recovery coefficient, and image contrast.
  
  
  RESULTS
  The profile curve at the edge of the hot sphere showed artifact due to Gibbs oscillation for all techniques, and also over estimation of recovery coefficient was seen in the hot sphere, as had been previously reported in a simulation study. These phenomena were more remarkable than Evolution in the Flash3D and Astonish techniques. For the contrast between hot sphere and background, the contrast recover was enough for the <17-mm hot spheres. These results showed that the effect of contrast correction was less as the radius of rotation diameter became large.
  
  
  CONCLUSIONS
  In the present study using the body phantom, overestimated counts and edge artifacts due to Gibbs oscillation were shown. These phenomena were different by each resolution correction algorithms. Also, there were limitation regarding image quality improvement by resolution correction depending on sphere size and length of radius of rotation.
authors.affiliation: Department of Clinical Radiology, Kagawa University Hospital.
authors.forename: Yukito
authors.initials: Y
authors.lastname: Maeda
authors.forename: Akio
authors.initials: A
authors.lastname: Nagaki
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Komi
authors.forename: Nobukazu
authors.initials: N
authors.lastname: Abe
authors.forename: Shinya
authors.initials: S
authors.lastname: Kashimura
mesh_terms: D000465:Algorithms; D016477:Artifacts; D003287:Contrast Media; D008962:Models, Theoretical; D019047:Phantoms, Imaging; D015899:Tomography, Emission-Computed, Single-Photon / Q000295:instrumentation / Q000379:methods*
chemical_list: D003287:Contrast Media