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Filtered backprojection for modifying the impulse response of circular tomosynthesis
G M Stevens1, R Fahrig, N J Pelc
1Department of Radiology, Stanford University, California 94305, USA. gstevens@s-word.stanford.edu
Medical Physics
|April 25, 2001
Summary
A new filtering technique improves circular motion tomosynthesis imaging. It creates more homogeneous blurring for out-of-focus objects, reducing structured artifacts in medical images.
Area of Science:
- Medical Imaging
- Digital Signal Processing
Background:
- Circular motion tomosynthesis (CMT) is an imaging technique.
- Off-focal plane objects in CMT can appear with structured blurring.
- Alternative imaging geometries offer different blurring characteristics.
Purpose of the Study:
- To develop a filtering technique to modify the 3D impulse response of CMT.
- To enable CMT to generate images resembling other imaging geometries.
- To improve the homogeneity of blurring for out-of-plane objects.
Main Methods:
- A novel filtering process was developed.
- The technique modifies the three-dimensional impulse response of CMT.
- The impulse response was altered from a ring to a disk shape.
Main Results:
- The filtering technique successfully modified the impulse response of CMT.
- Reconstructed images exhibit more homogeneous blurring for off-focal plane objects.
- The structured appearance of blurred out-of-plane objects was reduced.
Conclusions:
- The developed filtering technique enhances CMT image quality.
- This method reduces undesirable structured artifacts from out-of-plane objects.
- The technique offers a way to achieve image appearance similar to other tomographic methods.