title: Low Contrast Dose Catheter-Directed CT Angiography (CCTA).
abstract: OBJECTIVE
  Catheter-directed computed tomography angiography (CCTA) has been shown to reduce the contrast volumes required in conventional CTA, thus minimizing the risk of contrast-induced nephropathy (CIN).
  
  
  METHODS
  A retrospective analysis was performed on cases where CCTA was used to assess access vessels prior to transfemoral aortic valve implantation (TAVI, n = 53), abdominal aortic aneurysm assessment for endovascular aneurysm repair (EVAR, n = 11), and peripheral vascular disease (PVD, n = 24).
  
  
  RESULTS
  We show that CCTA can image vasculature with adequate diagnostic detail to allow assessment of lower extremity disease, anatomic suitability for EVAR, as well as potential contraindications to TAVI. Average contrast volumes for pre-TAVI, pre-EVAR, and PVD cases were 7, 11, and 28 mL, respectively.
  
  
  CONCLUSIONS
  This study validates the use of CCTA in obtaining diagnostic images of the abdominal and pelvic vessels and in imaging lower extremity vasculature.
authors.affiliation: VIR Division, Department of Medical Imaging, St. Michael's Hospital, University of Toronto, 30 Bond Street, Toronto, ON, M5B 1W8, Canada. amandaformosa@yahoo.ca.
authors.forename: Amanda
authors.initials: A
authors.lastname: Formosa
authors.affiliation: VIR Division, Department of Medical Imaging, St. Michael's Hospital, University of Toronto, 30 Bond Street, Toronto, ON, M5B 1W8, Canada. contact@denisemaysantos.com.|University of Toronto Scarborough, Department of Psychology, 1265 Military Trail, Toronto, ON, M1C 1A4, Canada. contact@denisemaysantos.com.
authors.forename: Denise May
authors.initials: DM
authors.lastname: Santos
authors.affiliation: VIR Division, Department of Medical Imaging, St. Michael's Hospital, University of Toronto, 30 Bond Street, Toronto, ON, M5B 1W8, Canada.
authors.forename: Daniel
authors.initials: D
authors.lastname: Marcuzzi
authors.affiliation: VIR Division, Department of Medical Imaging, St. Michael's Hospital, University of Toronto, 30 Bond Street, Toronto, ON, M5B 1W8, Canada.
authors.forename: Andrew A
authors.initials: AA
authors.lastname: Common
authors.affiliation: VIR Division, Department of Medical Imaging, St. Michael's Hospital, University of Toronto, 30 Bond Street, Toronto, ON, M5B 1W8, Canada.
authors.forename: Vikramaditya
authors.initials: V
authors.lastname: Prabhudesai
mesh_terms: D000005:Abdomen / Q000098:blood supply; D000368:Aged; D000369:Aged, 80 and over; D017544:Aortic Aneurysm, Abdominal / Q000000981:diagnostic imaging; D001808:Blood Vessels / Q000000981:diagnostic imaging*; D002318:Cardiovascular Diseases / Q000000981:diagnostic imaging*; D002404:Catheterization; D000072226:Computed Tomography Angiography / Q000379:methods*; D003287:Contrast Media / Q000008:administration & dosage / Q000009:adverse effects; D057510:Endovascular Procedures; D005260:Female; D006349:Heart Valve Diseases / Q000000981:diagnostic imaging; D019918:Heart Valve Prosthesis Implantation; D006801:Humans; D007674:Kidney Diseases / Q000139:chemically induced / Q000517:prevention & control; D008297:Male; D010388:Pelvis / Q000098:blood supply; D016491:Peripheral Vascular Diseases / Q000000981:diagnostic imaging; D012189:Retrospective Studies
chemical_list: D003287:Contrast Media
keywords: Abdominal aortic aneurysms (AAA); Aorta; Arterial intervention; Contrast media; EVAR; Intra-arterial; Peripheral vascular; TAVI