This study has investigated the relationship between linear attenuation coefficients (μ) and Hounsfield units (HUs) for six materials covering the range of values found clinically. Narrow-beam μ values were measured by performing radionuclide transmission scans using 99mTc, 123I, 131I, 201Tl and 111In. The μ values were compared to published data. The relationships between μ and HU were determined. These relationships can be used to convert computed tomography (CT) images to μ-maps for single photon emission computed tomography (SPECT) attenuation correction.
- Attenuation correction
Brown, S., Bailey, D. L., Willowson, K., & Baldock, C. (2008). Investigation of the relationship between linear attenuation coefficients and CT Hounsfield units using radionuclides for SPECT. Applied Radiation and Isotopes, 66(9), 1206-1212. https://doi.org/10.1016/j.apradiso.2008.01.002