Is Conventional X-Ray same as line frequency X-Ray?

Conventional X-Ray uses a high-energy beam of radiation to examine internal body structures. Line frequency X-Ray uses low-energy beams of radiation to examine internal body structures. The two types of X-Ray are not the same and will not be equivalent in every case.

Yes, conventional x-ray machines are line frequency generators, i.e 50Hz, in a half wave rectified circuit and 100Hz in a full wave rectified circuit.

There are direct 3 phase generators, and in that case the output would be 3 times the line frequency.

Out put Waveform of line frequency generators