title: [Magnetic resonance signal features of superparamagnetic iron oxide with different particle size and concentration].
abstract: To investigate the magnetic resonance (MR) signal features of superparamagnetic iron oxide (SPIO) with different particle size and concentration.
  
  
  
  The superparamagnetic iron oxide with different concentration and particle size was scanned by magnetic resonance; T1, T2 and T2(*) values of each group were recorded to evaluate the features of MR signals.
  
  
  
  The T1 value of SPIO with different particle size had negative linear relationship with concentration. In low concentration the T2 and T2(*) values were elevated markedly with the particle size decreased; while in high concentration the T2 and T2(*)values were elevated gently with particle size decreased. lg(T2), particle size and concentration of SPIO had linear relationship.
  
  
  
  SPIO affects magnetic resonance signal mainly with effect on T1 and T2. T2 value can be regarded as the major detection index in the magnetic resonance scan of SPIO. There is a linear relationship among particle size, SPIO concentration and lg(T2) value.
authors.affiliation: Department of Radiology, The First Affiliated Hospital, College of Medicine, Zhejiang University, Hangzhou 310003, China.
authors.forename: Bing-ying
authors.initials: BY
authors.lastname: Lin
authors.forename: Jing-feng
authors.initials: JF
authors.lastname: Zhang
authors.forename: Min-ming
authors.initials: MM
authors.lastname: Zhang
mesh_terms: D003287:Contrast Media / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D052203:Ferrosoferric Oxide / Q000737:chemistry / Q000494:pharmacology*; D006801:Humans; D007089:Image Enhancement; D008279:Magnetic Resonance Imaging / Q000379:methods*; D058185:Magnetite Nanoparticles / Q000737:chemistry; D010316:Particle Size
chemical_list: D003287:Contrast Media; D058185:Magnetite Nanoparticles; D052203:Ferrosoferric Oxide