The electromagnetic scale plays an important role in radiology because radiation has an electromagnetic frequency. Electromagnetic radiation is an electric and magnetic disturbance traveling through space. X-rays share this spectrum with other electromagnetic energies such as radio waves, microwaves, and light waves. Each of these energies operate on different ends of the spectrum.
One thing to mention is that ultrasound waves do not live on the electromagnetic spectrum and as as such will not share similar characteristics. Ultrasound waves are acoustic waves that propagate through a medium by means of vibrations of the molecules that make up the medium, demonstrating that they are not the same type of wave that X-rays are.
X-ray X-pert 