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European Radiology

, Volume 17, Issue 6, pp 1394–1402 | Cite as

Effects of injection rate and dose on image quality in time-resolved magnetic resonance angiography (MRA) by using 1.0M contrast agents

  • Harald KramerEmail author
  • Henrik J. Michaely
  • Martin Requardt
  • Martin Rohrer
  • Scott Reeder
  • Maximilian F. Reiser
  • Stefan O. Schoenberg
Magnetic Resonance

Abstract

In time-resolved MRA (TR MRA), injection parameters and contrast agent (CA) dose are important factors influencing image quality. In this study, three different injection schemes with different CA volumes were evaluated in 12 healthy volunteers. Injection rates between 0.2 and 0.8 ml/s were evaluated with CA volumes of 10 and 20 ml. To measure circulatory parameters, cine cardiac MRI was performed before each exam. Spatial resolution could be reduced to 2×1.4×2 mm3, temporal resolution was 2.25 s/frame. To exclude signal saturation at high CA concentrations, a phantom with fixed CA concentrations was placed in the field of view. SNR was measured, and the area under the curve of the arterial signal of the different injection schemes was calculated. Results showed the largest diagnostic window at a relatively slow injection rate of 0.4 ml/s and a CA volume of 10 ml. Circulatory parameters have an important impact on CA arrival, so delay times have to be set depending on these parameters.

Keywords

MRA Time-resolved contrast-enhanced MRA Injection rate 

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Harald Kramer
    • 1
    • 5
    Email author
  • Henrik J. Michaely
    • 1
  • Martin Requardt
    • 2
  • Martin Rohrer
    • 3
  • Scott Reeder
    • 4
  • Maximilian F. Reiser
    • 1
  • Stefan O. Schoenberg
    • 1
  1. 1.Institute of Clinical RadiologyUniversity Hospital of Munich, Ludwig Maximilian University of MunichMunichGermany
  2. 2.Siemens Medical SolutionsErlangenGermany
  3. 3.Schering AGBerlinGermany
  4. 4.Department of RadiologyUniversity of WisconsinMadisonUSA
  5. 5.University Hospital of Munich, Campus GrosshadernLudwig Maximilian UniversityMunichGermany

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