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The core of the twilite system is a very compact measuring head made from two LYSO crystals enclosed by medical grade tungsten, which is fully MR compatible. The head has an opening into which the catheter templates are inserted. There are templates available for different catheter dimensions. The illustration below shows a template with a fitted human-size catheter.
The scintillations in the LYSO crystals are conveyed to the photon detection unit via two flexible high efficiency light guides. This design is without any electronics in the sensor head and thus avoids any potential problems of electromagnetic interference with other devices. Furthermore, this design is minimizing any potential risks for the use in human research experiments.