The images of HD-SAFIRE ( @ ) showed similar image noise for liver parenchyma ( @ Hounsfield unit -LSB- HU -RSB- ) , signal-to-noise ratio for liver parenchyma ( @ ) , and lesion-to-liver contrast-to-noise ratio ( @ ) , compared with the FD-FBP images ( @ HU , P = @ ; @ , P > @ ; and @ , P > @ , respectively ) .