Evaluation of tilted cone-beam CT orbits in the development of a dedicated hybrid mammotomograph.
A compact dedicated 3D breast SPECT-CT (mammotomography) system is currently under development. In its initial prototype, the cone-beam CT sub-system is restricted to a fixed-tilt circular rotation around the patient's pendant breast. This study evaluated stationary-tilt angles for the CT sub-system that will enable maximal volumetric sampling and viewing of the breast and chest wall. Images of geometric/anthropomorphic phantoms were acquired using various fixed-tilt circular and 3D sinusoidal trajectories. The iteratively reconstructed images showed more distortion and attenuation coefficient inaccuracy from tilted cone-beam orbits than from the complex trajectory. Additionally, line profiles illustrated cupping artifacts in planes distal to the central plane of the tilted cone-beam, otherwise not apparent for images acquired with complex trajectories. This indicates that undersampled cone-beam data may be an additional cause of cupping artifacts. High-frequency objects could be distinguished for all trajectories, but their shapes and locations were corrupted by out-of-plane frequency information. Although more acrylic balls were visualized with a fixed-tilt and nearly flat cone-beam at the posterior of the breast, 3D complex trajectories have less distortion and more complete sampling throughout the reconstruction volume. While complex trajectories would ideally be preferred, negatively fixed-tilt source-detector configuration demonstrates minimally distorted patient images.
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Related Subject Headings
- Tomography, Emission-Computed, Single-Photon
- Systems Integration
- Subtraction Technique
- Sensitivity and Specificity
- Reproducibility of Results
- Phantoms, Imaging
- Nuclear Medicine & Medical Imaging
- Mammography
- Equipment Failure Analysis
- Equipment Design
Citation
Published In
DOI
ISSN
Publication Date
Volume
Issue
Start / End Page
Location
Related Subject Headings
- Tomography, Emission-Computed, Single-Photon
- Systems Integration
- Subtraction Technique
- Sensitivity and Specificity
- Reproducibility of Results
- Phantoms, Imaging
- Nuclear Medicine & Medical Imaging
- Mammography
- Equipment Failure Analysis
- Equipment Design