22 March 2016 Fluence-field modulated x-ray CT using multiple aperture devices
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Abstract
We introduce a novel strategy for fluence field modulation (FFM) in x-ray CT using multiple aperture devices (MADs). MAD filters permit FFM by blocking or transmitting the x-ray beam on a fine (0.1-1 mm) scale. The filters have a number of potential advantages over other beam modulation strategies including the potential for a highly compact design, modest actuation speed and acceleration requirements, and spectrally neutral filtration due to their essentially binary action. In this work, we present the underlying MAD filtration concept including a design process to achieve a specific class of FFM patterns. A set of MAD filters is fabricated using a tungsten laser sintering process and integrated into an x-ray CT test bench. A characterization of the MAD filters is conducted and compared to traditional attenuating bowtie filters and the ability to flatten the fluence profile for a 32 cm acrylic phantom is demonstrated. MAD-filtered tomographic data was acquired on the CT test bench and reconstructed without artifacts associated with the MAD filter. These initial studies suggest that MAD-based FFM is appropriate for integration in clinical CT system to create patient-specific fluence field profile and reduce radiation exposures.
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J. Webster Stayman, J. Webster Stayman, Aswin Mathews, Aswin Mathews, Wojciech Zbijewski, Wojciech Zbijewski, Grace Gang, Grace Gang, Jeffrey Siewerdsen, Jeffrey Siewerdsen, Satomi Kawamoto, Satomi Kawamoto, Ira Blevis, Ira Blevis, Reuven Levinson, Reuven Levinson, "Fluence-field modulated x-ray CT using multiple aperture devices", Proc. SPIE 9783, Medical Imaging 2016: Physics of Medical Imaging, 97830X (22 March 2016); doi: 10.1117/12.2214358; https://doi.org/10.1117/12.2214358
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