 All elements are essential: 1) timing, 2) reconstructions/reformats, and 3) 3-D renderings. Standard CTs with contrast also include timing issues and reconstructions/reformats. Only in CTA, however, is 3-D rendering a required element. This corresponds to the definitions that the CMS has applied to the Current Procedural Terminology codes. OR aUniversity of California Los Angeles, Los Angeles, California. bPanel Chair, Montefiore Medical Center, Bronx, New York. cPanel Vice-Chair, Uniformed Services University, Bethesda, Maryland. dOhio State University, Columbus, Ohio. eMichigan State University, East Lansing, Michigan; American College of Emergency Physicians. fOttawa Hospital Research Institute and the Department of Radiology, The University of Ottawa, Ottawa, Ontario, Canada; Canadian Association of Radiologists. gEmory University, Atlanta, Georgia. hBarrow Neurological Institute, Phoenix, Arizona; Neurosurgery expert. iMayo Clinic, Rochester, Minnesota. jUniversity of New Mexico, Albuquerque, New Mexico; American College of Physicians. kEinstein Healthcare Network, Philadelphia, Pennsylvania. lUniversity of California San Diego Medical Center, San Diego, California. mOregon Health & Science University, Portland, Oregon. nUniversity of North Carolina School of Medicine, Chapel Hill, North Carolina; American Academy of Neurology. oAlbany ENT & Allergy Services, PC, Albany, New York; American Academy of Otolaryngology-Head and Neck Surgery. pAlbert Einstein College of Medicine Montefiore Medical Center, Bronx, New York, Internal medicine physician. qColumbia University Medical Center, New York, New York. rUniversity of Cincinnati Medical Center, Cincinnati, Ohio. sSpecialty Chair, Atlanta VA Health Care System and Emory University, Atlanta, Georgia.
Cerebrovascular Diseases Aneurysm Vascular Malformation and Subarachnoid Hemorrhage PCAs.  All elements are essential: 1) timing, 2) reconstructions/reformats, and 3) 3-D renderings. Standard CTs with contrast also include timing issues and reconstructions/reformats. Only in CTA, however, is 3-D rendering a required element. This corresponds to the definitions that the CMS has applied to the Current Procedural Terminology codes. OR aUniversity of California Los Angeles, Los Angeles, California. bPanel Chair, Montefiore Medical Center, Bronx, New York. cPanel Vice-Chair, Uniformed Services University, Bethesda, Maryland. dOhio State University, Columbus, Ohio. eMichigan State University, East Lansing, Michigan; American College of Emergency Physicians. fOttawa Hospital Research Institute and the Department of Radiology, The University of Ottawa, Ottawa, Ontario, Canada; Canadian Association of Radiologists. gEmory University, Atlanta, Georgia. hBarrow Neurological Institute, Phoenix, Arizona; Neurosurgery expert. iMayo Clinic, Rochester, Minnesota. jUniversity of New Mexico, Albuquerque, New Mexico; American College of Physicians. kEinstein Healthcare Network, Philadelphia, Pennsylvania. lUniversity of California San Diego Medical Center, San Diego, California. mOregon Health & Science University, Portland, Oregon. nUniversity of North Carolina School of Medicine, Chapel Hill, North Carolina; American Academy of Neurology. oAlbany ENT & Allergy Services, PC, Albany, New York; American Academy of Otolaryngology-Head and Neck Surgery. pAlbert Einstein College of Medicine Montefiore Medical Center, Bronx, New York, Internal medicine physician. qColumbia University Medical Center, New York, New York. rUniversity of Cincinnati Medical Center, Cincinnati, Ohio. sSpecialty Chair, Atlanta VA Health Care System and Emory University, Atlanta, Georgia.