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Circle plus partial helical scan scheme for a flat panel detector-based cone beam breast X-ray CT.
Dong Yang1, Ruola Ning, Weixing Cai
1Department of Imaging Sciences, University of Rochester Medical Center, 601 Elmwood Avenue Rochester, NY 14642, USA. dxy8692@yahoo.com
International Journal of Biomedical Imaging
|January 14, 2010
Summary
Cone beam breast CT (CBBCT) offers 3D imaging, improving on mammography for dense breasts. A new circle plus partial helical scan scheme effectively reduces common CBBCT artifacts.
Area of Science:
- Medical Imaging
- Radiology
- Cone Beam CT
Background:
- Mammography struggles with detecting small or occult cancers in dense breasts due to structure superposition.
- Flat panel detector-based cone beam breast CT (CBBCT) offers 3D isotropic spatial resolution, overcoming mammography's limitations.
- Circular scan mode in CBBCT is geometrically simple and suitable for functional imaging.
Purpose of the Study:
- To address image artifacts in CBBCT caused by large cone angles during single circular scans.
- To propose and evaluate a novel 'circle plus partial helical scan' scheme for improved CBBCT reconstruction.
- To compare the proposed scheme against a 'circle plus straight line' scan using computer simulations.
Main Methods:
- Computer simulations were performed using a numerical breast phantom.
- A 'circle plus partial helical scan' acquisition strategy was designed.
- Image reconstruction was performed, and artifacts were analyzed and compared to a 'circle plus straight line' scheme.
Main Results:
- Single circular scans in CBBCT lead to artifacts like density drop and geometric distortion, especially away from the scan plane.
- The proposed 'circle plus partial helical scan' scheme demonstrated practical feasibility.
- Simulations showed the new scheme effectively corrects artifacts to a certain degree.
Conclusions:
- The 'circle plus partial helical scan' scheme is a viable method to mitigate artifacts in CBBCT.
- This technique enhances the diagnostic quality of 3D breast imaging with CBBCT.
- Further development could improve artifact correction and clinical applicability of CBBCT.
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