Figure 1

MRI guidewire design. A-The 0.035” guidewire has a modified loopless antenna with a tip solenoid, is 1.28 m long, and is connected to tune/match circuitry with an MMCX connector. A shielded box houses the circuitry and fiberoptic probe. B- The schematic depicts a 2.5 cm long tightly wound solenoid coil, a tapered nitinol rod, a polyimide lumen for the temperature probe, a spiral-cut nitinol hypotube for flexibility, Pebax insulation (blue) between the rod/polyimide assembly and hypotube, and a final outer layer of insulation (transparent).