4D ultrasound in rohini Best ultrasound in delhi Dr Mittal’s Diagnostic Centre, was started back in 1995 by Dr Rakesh Mittal, M.D. (Radio-Diagnosis); armed with an ample experience in Radiology and the ambition to provide quality medical diagnostic healthcare facilities in Rohini, North Delhi. Having completed over 20 successful years, it has now grown to become one of the leading ISO 9001:2000 certified diagnostic centers and pathology labs in Delhi.