Preparations - The patient prep for an examination of the urinary system is similar to that for a barium enema examination. Since the colon and small intestines lie over the kidneys, ureters and bladder, it is important that these organs be as clear as possible. Gas and fecal matter can obscure pathology in the kidneys or other parts of the urinary system. It may be necessary to use compression or additional views to remove overlying gas shadows when attempting to demonstrate the kidneys or ureters. 14x17 LW centered at L-4 for a sthenic patient.
Exposure is made at the end of exhalation.
AP or PA radiographs are taken at timed intervals post contrast media injection. The prone position is recommended for demonstration of the ureteropelvic region and for filling of the obstructed urecter in the presence of hydronephrosis. The ureters fill better in the prone position because the curve of the ureters is reversed and gravity aids in the movemen to the contrast. Ureteral compression may be applied to delay filling of the ureters and bladder, thus allowing complete visualization of the pelvis and calyces. Do not leave a patient with compression in place unattended.