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Dynamic small animal lung imaging via a postacquisition respiratory gating technique using micro-cone beam computed
Jicun Hu1, Steve T Haworth, Robert C Molthen
1Department of Biomedical Engineering, Marquette University, Milwaukee, WI 53233, USA. jicunhu@lbl.gov
Academic Radiology
|September 8, 2004
Summary
A new postacquisition gating method simplifies micro computed tomography imaging of live small animal lungs. This technique reduces motion artifacts, improving visualization for pulmonary physiology studies.
Area of Science:
- Medical Imaging
- Biomedical Engineering
- Pulmonary Research
Background:
- Micro computed tomography (micro-CT) is crucial for small animal imaging.
- Imaging live animals is preferred for pulmonary physiology studies.
- Lung motion during imaging necessitates gating to reduce artifacts.
Purpose of the Study:
- To propose and implement a simple postacquisition gating method for micro-CT lung imaging.
- To overcome difficulties associated with precapture ventilation gating.
- To improve image quality for dynamic pulmonary studies.
Main Methods:
- Utilized rats for imaging, acquiring low-dose projection images at 30 fps.
- Developed an automated region of interest algorithm to track lung ventilation phase.
- Averaged projection images at specific phases and reconstructed volumes using the Feldkamp cone-beam algorithm.
Main Results:
- Achieved reconstructions with significantly reduced motion artifacts.
- Demonstrated improved bone registration, lung edge definition, and intrapulmonary structure resolution.
- Showcased the ability to reconstruct different breathing phases from a single scan.
Conclusions:
- A novel postacquisition gating method uses 2D projection data for micro-CT lung imaging.
- The method is simple, requires no extra respiratory monitoring equipment.
- Potential applications include lung tumor detection and dynamic pulmonary physiology studies.