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CT Angiography Contrast-Enhanced MR Imaging, Brain Contrast-Enhanced MR Imaging, IAC Total No. of patients 228 304 266 798 No. of males (%) 106 (47) 115 (38) 98 (37) 319 (40) Age (yr) (mean) (range) 56 (19–90) 55 (15–90) 54 (6–93) 55 (6–93) Emergency setting (%) 191 (84) 63 (21) 3 (1) 257 (32) Diagnostic efficacy 5 (2.2%) 4 (1.3%) 4 (1.5%) 13 (1.6%) Therapeutic efficacy 3 (1.3%) 2 (0.7%) 3 (1.1%) 8 (1.0%) Note:—IAC indicates internal auditory canal.
CT Angiography (%) Contrast-Enhanced MR Imaging, Brain (%) Contrast-Enhanced MR Imaging, IAC (%) Total (%) Otolaryngology 0 (0%) 35 (12%) 158 (59%) 193 (24%) Neurology 23 (10%) 41 (13%) 31 (12%) 95 (12%) Internal medicine/primary care specialties 13 (6%) 137 (45%) 68 (26%) 218 (27%) Emergency department 191 (84%) 63 (21%) 3 (1%) 257 (32%) Neurosurgery 1 (0.4%) 8 (3%) 3 (1%) 12 (2%) Othera 0 (0%) 20 (7%) 3 (1%) 23 (3%) Note:—IAC indicates internal auditory canal.
↵a Each ordering 3 or fewer studies: Cardiology, Cardiothoracic Surgery, Endocrinology, General Surgery, Hematology/Oncology, Obstetrics and Gynecology, Ophthalmology, Pediatrics, Physical Medicine and Rehabilitation, Pulmonology, Rheumatology, Radiation Oncology, and Urology.
