Proton resonance frequency (PRF) shift is widely used for MR temperature mapping, but fails in adipose tissues. T1 measurement offers an alternative temperature mapping method in adipose tissues. Combined PRF-T1 temperature mapping has been evaluated for Cartesian MRI, but there is a lack of research for non-Cartesian techniques. In this work, we propose a new 3D stack-of-radial technique for combined PRF-T1 MR temperature mapping. Results from non-heating in vivo scans demonstrate good stability of T1 and PRF measurements. Data from ex vivo high-intensity focused ultrasound (HIFU) ablations demonstrate good agreement between both PRF and T1 mapping compared to temperature probes.