Computed Tomographic Angiography

  • M. S. van Leeuwen
  • L. J. Polman
  • J. Noordzij
  • B. Velthuis
  • P. F. G. M. van Waes
Conference paper


Computed tomographic angiography (CTA) is a vascular imaging technique based on the rapid acquisition of volumetric CT data during the bolus phase of intravenously administered contrast [1–3]. CTA is a recent diagnostic technique and is still under development. Only preliminary studies on its diagnostic value have been performed. In this chapter the technique is described and the clinical experience of various research groups with a number of specific CTA applications is discussed. The latest generation of CT scanners are equiped with slip-ring current and data transfer. This makes it possible to rotate the assembly of X-ray tube and X-ray detectors continuously. During this continuous rotation the patient can be moved at a constant speed through the plane of the X-ray tube and detectors. The simultaneous linear movement of the patient and continuous rotation of the X-ray tube creates a helical path of the X-ray beam relative to the patient’s longitudinal axis. From the continuous, helical data acquisition, axial CT slices can be reconstructed at any desired location along the longitudinal axis of the examined volume. Overlapping slices can be reconstructed with no additional radiation to the patient, improving anatomic resolution in the longitudinal direction and enabling image reconstructions to be performed in any desired plane [4, 5]. The quality of these reconstructions is markedly improved from conventional CT due to the continuous helical data acquisition. In conventional CT, data acquisition and subsequent table transport takes 6–12 s for each slice. With helical CT a full rotation usually takes 1 s and, depending on the capacity of the X-ray tube, up to 50 rotations can be acquired in one scan. Therefore, the time needed to image a large number of overlapping slices is dramatically reduced. Vascular detail is optimized because the entire volume of interest is scanned at peak vascular enhancement during a single breath-hold.


Renal Artery Compute Tomography Angiography Digital Subtraction Angiography Renal Artery Stenosis Maximum Intensity Projection 
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Copyright information

© Springer-Verlag Berlin Heidelberg 1996

Authors and Affiliations

  • M. S. van Leeuwen
    • 1
  • L. J. Polman
    • 1
  • J. Noordzij
    • 1
  • B. Velthuis
    • 1
  • P. F. G. M. van Waes
    • 1
  1. 1.Department of Radiotherapy and Nuclear MedicineUniversity Hospital UtrechtUtrechtThe Netherlands

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