In the present study the urinary tract of 30 domestic pigeons was examined radiographically and with computes tomography. The main aim of this study was to find a standarized quantity of contrat media for defined regions (urinary tract). For the CT-scan the pigeons were divided into 5 groups with 5 pigeons, 1 group with 3 pigeons and 1 group with 2 pigeons. Each group received iodine CM Imagopaque® 300 as bolus injektion in a dosage of 0,1ml/100g, 0,08ml/100g, 0,05ml/100g, 0,03ml/100g and 0,01ml/100g BW intravenously. The scan interval of each group was variable. Scanning time as well as subjective and objective contrast enhancement (measured in Hounsfield Units HU) of kidneys and ureters were evaluated. Densitometry of normal kidney parenchyma was 35 to 60 HU, after CM application up to 200 HU. The ureter was not visible in plain images but showed a density of 250 to 2000 HU after CM injection. In this study the CM enhancement was visible over the entire examination period of 20 minutes. Iodine CM dosages of 0,1ml/100g, 0,08ml/100g, 0,05ml/100g BW caused satisfying enhancement of parenchymal organs in birds. In dogs usually 2 ml of contrast medium per kg BW (370 mg iodine/ml) are applicated. This study showed, that CT examination of the urinary tract by pigeons can be administered with a dose of 0,05 ml of contrat medium per 100g BW satisfactorily. The presented resultsshould act as a basic for contrast enhancement of soft tissues in birds and for tumor diagnosis.