Optimized multi-pinhole collimator for dual-purpose clinical and preclinical imaging
AssigneeUniversity of Macau
InventorSeng Peng Mok
Life of this patent
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Abstract
A multi-pinhole collimator is formed by calculating a projection size (D) for different pinhole numbers (n) for a predetermined field-of-view (FOV) (d) by arranging a plurality of projections into a pattern. A pattern is selected which utilizes a whole detector with maximized packing density, minimum truncation to provide a projection overlap below a predetermined limit. The number of pinholes is modified to calculate a collimator length, a corresponding acceptance angle and aperture size. Sensitivities for individual pinholes are added to obtain a total sensitivity for a given pinhole number, and an optimized multi-pinhole configuration is obtained by maximizing the total sensitivity for a predetermined target resolution (Rt) and field-of-view (FOV) (d).
Claims8
A method for forming a multi-pinhole collimator, the method comprising:
- calculating a projection size (D) for different pinhole numbers (n) for a predetermined field-of-view (FOV) (d) by arranging a plurality of projections into a pattern;
- configuring the pattern to utilize a whole detector with maximized packing density, minimum truncation to provide a projection overlap below a predetermined limit;
- modifying a number of pinholes to calculate a collimator length;
- calculating an acceptance angle and aperture size;
- adding sensitivities for individual pinholes to obtain a total sensitivity for a given pinhole number;
- selecting an optimized multi-pinhole configuration by maximizing the total sensitivity for a predetermined target resolution (Rt) and field-of-view (FOV) (d);
- and
- producing the multi-pinhole collimator comprising an aperture plate having a plurality of pinholes formed therein and having a pinhole configuration corresponding to the selected optimized multi-pinhole configuration.
A multi-pinhole collimator comprising:
- a plurality of pinholes, the pinholes having a calculated projection size (D) for different pinhole numbers (n) for a predetermined field-of-view (FOV) (d) with the pinholes arranged to project into a pattern;
- the pattern of the pinholes configured to utilize a whole detector with maximized packing density, minimum truncation to provide a projection overlap below a predetermined limit, and having a number of pinholes selected in accordance with a calculation of a collimator length, acceptance angle and aperture size, with sensitivities for individual pinholes added to obtain a total sensitivity for a given pinhole number;
- and
- the multi-pinhole configuration optimized by maximizing the total sensitivity for a predetermined target resolution (Rt) and field-of-view (FOV) (d).
Dependencies are inferred from the claim text.