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Umram researchers published a new study for implant safety research under MRI. The project introduces a new in vivo testing method and system for active implantable medical devices. The computer simulations and phantom experiments poorly represent potential temperature increases and Animal experiments could be a better model but heating experiments conducted immediately after the surgery suffer from alterations of the thermoregulatory and tissue properties during acute testing conditions. In this study, a new temperature sensor implant (TSI) system was demonstrated. It resembles an active implantable medical device but it measures the most potential heating locations during MRI. The battery operated device allows low power wireless data transfer. Therefore, it can be used for subacute and acute MRI animal heating tests.