Info on ultrasound tech?

I live in AZ and I am having a horrible time trying to figure out how to get into ultrasound. I looked up the schools that are accredited through CAAHEP, which was recomended by others online, and only found one school offering the program. Once looking further into that school I found that you must first be credentialed in Medical Radiography (ARRT), Nursing (RN), Nuclear Medicine (CNMT), Respiratory Therapist (RTT), Registered Vascular Technologist (RVT), Registered Diagnostic Cardiac Technologist (RDCS), Registered Cardiac Sonographer (RCS), Registered Vascular Specialist (RVS)!!!! I don't know if there is an easier way to go about this that won't take me a million years to get into my carreer. Any info would be greatly appreciated. Thank you