<prompt> A dense renogram is obtained byDehydrating the patientIncreasing the dose of contrast mediaRapid Bolus injection of dyeUsing non ionic media  <response>: C i.e. Rapid Bolus injection of dye Dense nephrogram or intensified renal images are obtained iatrogenically by - - Rapidbolus injection of same contrast dose concentration preferred method2. - Increased contrast concentration is less preferred than rapid injection method. The quantity that can be used safely depends on weight hydration of patient. - Abdominal ureteric compression may be used to temporarily obstruct the upper urinary tract but is demanding. - Dehydration method used in past is not used now bo more chances of precipitation of proteins in renal tubules, obstruction, oliguria anuria. 