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In this paper, we will present a preliminary study based on a prototype of the MRI-compatible, ultra-high resolution SPECT system for use in a pre-existing Siemens 3.0 T MR scanner. The system uses an ultra-high special resolution energy-resolved photon-counting (ERPC) CdTe detector that we have recently developed. This detector consists of eight detector hybrids, each having a pixilated CdTe detector of 1 mm thickness, bump-bonded to a custom-designed CMOS readout ASIC. Each detector hybrid offers an imaging area of 1.1 cm Ã 2.2 cm that is divided into an array of 32 Ã 64 pixels with a pitch size of 350 Â¿m Ã 350 Â¿m. A prototype SPECT system has been designed and tailored for use inside the 3.0 T Siemens scanner for tomographic imaging. It consists of a single ERPC detector head, coupled to a collimation aperture. The system is supported by a non-magnetic gantry that allows the system to be moved in and out the Siemens scanner and to be rotated around the object to obtain a sufficient angular sampling. All shielding, supporting and cooling structures are proved to be MRI-compatible. The imaging performance of the prototype system with presence of magnetic field will be evaluated by using image of the Co57 point source and the results will be presented.