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22 March 2016 Fluence-field modulated x-ray CT using multiple aperture devices
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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, Aswin Mathews, Wojciech Zbijewski, Grace Gang, Jeffrey Siewerdsen, Satomi Kawamoto, Ira Blevis, and 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);

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