Freddy Ståhlberg
Expert
Image artifacts due to a time-varying contrast medium concentration in 3D contrast-enhanced MRA
Författare
Summary, in English
The purpose of this work was to study image effects due to time-varying contrast medium concentration in contrast-enhanced three dimensional (3D) magnetic resonance angiography (MRA) images. Two different simulation models (1D and 3D) and two different contrast medium variation schemes were used. Phantom measurements were also performed. Experiments were performed for several different bolus timings. Similar sequence and image object parameters were used in both simulations and measurements (TE/TR 2. 1/7.8 mses, flip angle 30 degrees, T1/T2 1200-80/150-40 msec, flow velocity 100 cm/sec). A small variation in bolus timing yielded large variations in the appearance of the image effects, especially if the center of k-space was sampled in the vicinity of rapid contrast medium concentration variation. For a typical bolus injection in a patient, a severe signal loss but only minor ringing and edge artifacts appeared if the bolus injection was poorly timed. Effects of pulsatile flow were minor. The 3D model proved to be a useful tool in these studies.
Avdelning/ar
- Medicinsk strålningsfysik, Malmö
- Diagnostisk radiologi, Lund
- Diagnostisk radiologi, Malmö
- Institutionen för kliniska vetenskaper, Malmö
Publiceringsår
1999
Språk
Engelska
Sidor
919-928
Publikation/Tidskrift/Serie
Journal of Magnetic Resonance Imaging
Volym
10
Issue
6
Länkar
Dokumenttyp
Artikel i tidskrift
Förlag
John Wiley & Sons Inc.
Ämne
- Radiology, Nuclear Medicine and Medical Imaging
Nyckelord
- contrast medium
- angiography
- magnetic resonance
- artifacts
- simulations
Status
Published
Forskningsgrupp
- Medical Radiation Physics, Malmö
- Radiology Diagnostics, Malmö
ISBN/ISSN/Övrigt
- ISSN: 1522-2586