BTX BioTech X-ray, a St. Louis-based portable diagnostic imaging service with operations in Iowa, announced that it has acquired US X-ray LLC of Lenexa, Kan. The acquisition, which was effective July 1, expands BTX's service regions to the Greater Kansas City and Oklahoma City areas.  BTX has operated in Central Iowa since December 2012, when it purchased Portable X-ray Inc.of Des Moines. BTX operates a network of more than 40 mobile units to provide services to non-hospital settings in Illinois, Iowa, Kansas, Missouri and Oklahoma.