The use of MRI on an animal with a DSI implant has been and can be done successfully. There are a few considerations to keep in mind regarding MRI.

1. The implants will not work during the MRI and may turn on/off. Therefore, you should not expect to collect physiologic data during the MRI. After MRI is complete, make sure implant is turned off. 
2. We cannot fully predict the impact of the metal in the implant on the MRI results or the physical impact to the animals. DSI implantable devices have been used in MRIs in rats and larger animals such as pigs with no notable physical damage to the animals. The metal content of the implant is likely to obscure the MRI image in a significant area around the implant and produce artifacts (e.g., voids or shadows). 

See publication for more information:

Nölte, I., Gorbey, S., Boll, H., Figueiredo, G., Groden, C., Lemmer, B., & Brockmann, M. A. (2011). Maintained functionality of an implantable radiotelemetric blood pressure and heart rate sensor after magnetic resonance imaging in rats. Physiological Measurement, 32(12), 1941–1951. https://doi.org/10.1088/0967-3334/32/12/005