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Related Experiment Videos

Low-artifact intravascular devices: MR imaging evaluation.

G P Teitelbaum1, H V Ortega, S Vinitski

  • 1Huntington Medical Research Institute, Pasadena, Calif.

Radiology
|September 1, 1988
PubMed
Summary
This summary is machine-generated.

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Magnetic resonance imaging (MRI) can detect small clots in vena cava filters. Spin-echo and gradient-echo MRI techniques assess filter function and patency, even with low-artifact devices.

Area of Science:

  • Medical Imaging
  • Biomaterials Science

Background:

  • Vena caval filters are crucial for preventing pulmonary embolism.
  • Assessing filter integrity and detecting complications like thrombosis noninvasively is clinically important.
  • Traditional imaging modalities can be limited by artifacts from metallic intravascular devices.

Purpose of the Study:

  • To evaluate the efficacy of magnetic resonance (MR) imaging techniques, specifically spin-echo (SE) and gradient-echo (GRE), in visualizing vena caval filters and associated thrombi.
  • To compare the performance of SE and GRE imaging in detecting thrombi within various filter types.
  • To assess the feasibility of noninvasive MR evaluation in patients with intravascular devices.

Main Methods:

  • Flow-phantom MR imaging was performed using SE and GRE techniques at 1.5 T.

Related Experiment Videos

  • Imaging was conducted on multiple vena caval filter models (Greenfield, Amplatz, Simon nitinol) and their facsimiles made of titanium alloy (TMA wire) and MP32-N alloy.
  • MR imaging was also used to assess caval patency in two patients with previously placed Mobin-Uddin filters.

    • Main Results:

    • SE imaging detected thrombi as small as 5 x 5 mm in Greenfield, Simon nitinol, and TMA-wire facsimile filters.
    • Larger thrombi (10 x 20 mm) were needed for detection with the MP32-N Amplatz filter.
    • GRE imaging identified intraluminal filter tilting and demonstrated postfilter turbulence caused by clots, particularly with the Amplatz filter.
    • Vascular devices made of tantalum or TMA wire produced fewer "black-hole" artifacts compared to stainless-steel devices.
    • SE and GRE imaging proved useful in determining caval patency in patients with existing filters.

    Conclusions:

    • Noninvasive MR imaging, using both SE and GRE techniques, is a feasible method for evaluating vena caval filters and detecting thrombi.
    • The choice of filter material (e.g., TMA wire, nitinol) influences MR artifact severity.
    • MRI can assess filter function, detect complications, and determine vascular patency in the presence of various intravascular devices.