You can do it without a studio license now, at least in NX10.
Just type raster image in the command finder to locate it, then if you have help setup, you can hit F1 as to how to use it
I've brought in a logo, put some lines on it using a compination splines and sketches
Elmhirst Industries, Specializing in Prototype sheet metal stampings and assemblies
Production: NX 12.0.1 / Autoform r7 /WorkNC 2018 r2
PC: Rave Cadbeast: Intel(R) i7-4790K CPU @ 4.GHz /32gb ram /NVIDIA Quadro P2000 on Win10 Pro