Radiologic investigations can be confusing to clinicians and radiologists alike. Questions invariably arise as to which type of imaging study best answers the clinical question posed. Once a modality is determined, decisions must be made regarding the technical manner in which the study is performed and if intravenous contrast is required. Patient factors, risks, benefits, and other variables must also be considered. This pocket guide is written for anyone who needs to understand enough about radiology to know which study to order in a patient workup. The book addresses imaging studies by modality, body region, and type of study in bulleted outline format for easy reference. General considerations for each modality - including advantages and disadvantages - are presented, followed by patient preparation and requirements for each type of examination. The author explains how specific studies are performed and what information can be obtained, study indications, contraindications, and limitations.