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Flat panel computed tomography for non-invasive flow measurement: initial results in in-vitro studies
Andreas H Mahnken1, Michael Grasruck, Bernhard Schmidt
1Department of Diagnostic Radiology, RWTH-Aachen University, Aachen, Germany. mahnken@rad.rwth-aachen.de
European Radiology
|December 7, 2007
Summary
Flat panel computed tomography (FPCT) can quantify flow by analyzing contrast changes. While accurate at low rates, further research is needed for higher flow rates in medical imaging.
Area of Science:
- Medical Imaging
- Biomedical Engineering
- Fluid Dynamics
Background:
- Accurate quantification of fluid flow is crucial in various medical applications.
- Traditional imaging techniques may have limitations in dynamic flow assessment.
- Flat panel computed tomography (FPCT) offers potential for volumetric imaging.
Purpose of the Study:
- To evaluate the feasibility of FPCT for quantifying fluid flow.
- To analyze contrast changes along the z-axis for flow measurement.
- To assess the accuracy of FPCT-derived flow rates compared to known injector settings.
Main Methods:
- An in-vitro phantom study using a silicone tube (3-mm diameter).
- Contrast material injected at varying flow rates (0.1-1.0 ml/s).
- FPCT scans acquired with a 3-second gantry rotation time; 41 phases reconstructed.
Main Results:
- Good agreement between calculated and injected flow rates at lower flow rates.
- Agreement decreased as flow rates increased.
- Mean deviation of 3.72% using full gantry rotation; no significant differences between reconstruction techniques (p=0.9726).
Conclusions:
- FPCT is a feasible technique for computing fluid flow.
- Preliminary results show good accuracy at low flow rates.
- Further studies are necessary to validate FPCT for higher flow rates.
