How to choose the machine with the correct Voltage of generator KV ?

Usually the machine with 160 KV（or 155KV）is normal for most of the customers.

Big machine like the machines bigger size than 1.5m x 1.5m should use 200KV generator.

100KV, 90KV and 80KV are mainly used in the small size machine and for the customers who needs just a standard x-ray machine. Or some customers who are short in budgets.