title: Investigation of the relationship between linear attenuation coefficients and CT Hounsfield units using radionuclides for SPECT.
abstract: This study has investigated the relationship between linear attenuation coefficients (mu) and Hounsfield units (HUs) for six materials covering the range of values found clinically. Narrow-beam mu values were measured by performing radionuclide transmission scans using (99m)Tc, (123)I, (131)I, (201)Tl and (111)In. The mu values were compared to published data. The relationships between mu and HU were determined. These relationships can be used to convert computed tomography (CT) images to mu-maps for single photon emission computed tomography (SPECT) attenuation correction.
authors.affiliation: Institute of Medical Physics, School of Physics, University of Sydney, NSW 2006, Australia. sbrown@physics.usyd.edu.au
authors.forename: Saxby
authors.initials: S
authors.lastname: Brown
authors.forename: Dale L
authors.initials: DL
authors.lastname: Bailey
authors.forename: Kathy
authors.initials: K
authors.lastname: Willowson
authors.forename: Clive
authors.initials: C
authors.lastname: Baldock
mesh_terms: D019047:Phantoms, Imaging; D010938:Plant Oils; D019904:Polymethyl Methacrylate; D011874:Radiometry / Q000379:methods*; D019275:Radiopharmaceuticals; D015899:Tomography, Emission-Computed, Single-Photon / Q000379:methods*; D014057:Tomography, X-Ray Computed / Q000379:methods*; D014867:Water; D014934:Wood
chemical_list: D010938:Plant Oils; D019275:Radiopharmaceuticals; D014867:Water; D019904:Polymethyl Methacrylate