The large expense and running costs of traditional 1.5T scanners have meant that as demand for scans has grown supply has not been able to keep up. Novel, ultra-low field systems aim to address this problem by producing images with some resolution losses as a trade-off for reduced costs. However, access to such devices is currently restricted, limiting the possible research output. In this work we develop and test a simulation model of 6.5 mT b-SSFP acquisitions, which we compare to actual scanner acquisitions. We find that such simulations produce qualitatively and quantitatively similar images to real scans.