System and method of x-ray flux management control
First Claim
Patent Images
1. A method of diagnostic imaging comprising the steps of:
- comparing a position of a subject in a scanning bay relative to a reference position;
determining a region of maximum attenuation of the subject from the comparison;
automatically adjusting an attenuation characteristic of an attenuation filter based on the determined region of maximum attenuation of the subject; and
imaging the subject.
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Abstract
A system and method of diagnostic imaging is provided that includes determining a position of a subject in a scanning bay and tailoring x-ray attenuation such that the specific position of the subject is taken into consideration. The present invention automatically selects a proper attenuation filter configuration, corrects patient centering, and corrects noise prediction errors, thereby increasing dose efficiency and tube output.
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Citations
30 Claims
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1. A method of diagnostic imaging comprising the steps of:
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comparing a position of a subject in a scanning bay relative to a reference position; determining a region of maximum attenuation of the subject from the comparison; automatically adjusting an attenuation characteristic of an attenuation filter based on the determined region of maximum attenuation of the subject; and imaging the subject. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A computer readable storage medium having stored thereon a computer program representing a set of instructions which, when executed by at least one processor, causes the at least one processor to:
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receive feedback regarding a position of maximum attenuation of a subject to be scanned; determine a value of mis-centering of the subject to be scanned from the position of maximum attenuation relative to an isocenter of an x-ray beam; adjust at least one of an attenuation filter configuration and a subject position based on the value of mis-centering; and acquire radiographic diagnostic data from the subject. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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24. A tomographic system comprising:
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a rotatable gantry having a bore centrally disposed therein; a table movable within the bore and configured to position a subject for tomographic data acquisition within the bore; a high frequency electromagnetic energy projection source positioned within the rotatable gantry and configured to project high frequency electromagnetic energy toward the subject; a detector array disposed within the rotatable gantry and configured to detect high frequency electromagnetic energy projected by the projection source and impinged by the subject; an attenuation filter positioned between the high frequency electromagnetic energy projection source and the subject; and a computer programmed to; determine a region of maximum attenuation of the subject; and adjust at least one of an attenuation characteristic of the attenuation filter and a table position such that a region of minimum attenuation of the attenuation filter is aligned with the region of maximum attenuation of the subject. - View Dependent Claims (25, 26, 27, 28, 29, 30)
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Specification