RT Book, Section A1 Gomella, Leonard G. A1 Haist, Steven A. SR Print(0) ID 2694950 T1 Chapter 15. Imaging Studies T2 Clinician's Pocket Reference: The Scut Monkey, 11e YR 2007 FD 2007 PB The McGraw-Hill Companies PP New York, NY SN 978-0-07-145428-5 LK accessmedicine.mhmedical.com/content.aspx?aid=2694950 RD 2021/01/23 AB In general, follow this principle: Obtain plain films before obtaining films that require contrast. Each hospital has its own guidelines for patient preps. Consult the radiology department before ordering any x-ray that requires a prep. Examinations that require no specific bowel preparation are routine CXR, flat and upright abdominal films, cystograms, C-spines, skull series, extremity films, CT scans of the head and chest, and many others.