METHOD AND DEVICE FOR DETERMINING CT SYSTEM PARAMETER
First Claim
1. A method for determining a computed tomography (CT) system parameter, wherein a CT system comprises an X-ray source and a detector;
- and the method comprises;
controlling a mould body to move between the X-ray source and a detection surface of the detector; and
acquiring X-ray projections of the mould body during movement on the detection surface, wherein the mould body has a first plane and a second plane perpendicular to each other, and the first plane and the second plane are always perpendicular to the detection surface during the movement of the mould body;
determining a first straight line and a second straight line according to the acquired X-ray projections, wherein the first straight line is a straight line of a projection line segment of an edge of the first plane in boundary line segments of the acquired X-ray projections, the second straight line is a straight line of a projection line segment of an edge of the second plane in the boundary line segments of the acquired X-ray projections, a plane determined by the first straight line and a focus of the X-ray source is perpendicular to the detection surface, and a plane determined by the second straight line and the focus of the X-ray source is perpendicular to the detection surface; and
determining an intersection point of the first straight line and the second straight line as coordinates of a foot of a perpendicular of the focus of the X-ray source on the detection surface, wherein a CT coordinate system parameter comprises the coordinates of the foot of the perpendicular.
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Accused Products
Abstract
A method for determining a CT system parameter: controlling a mould body to move between an X-ray source and a detection surface of a detector, and acquiring X-ray projections of the mould body during movement on the detection surface, wherein the mould body has a first plane and a second plane perpendicular to each other, and the first plane and the second plane are always perpendicular to the detection surface during the movement of the mould body; determining a first straight line and a second straight line according to the acquired X-ray projections; and determining an intersection point of the first straight line and the second straight line as a pedal coordinate of a focus of the X-ray source on the detection surface, a CT coordinate system parameter including the coordinates of the foot of the perpendicular.
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Citations
26 Claims
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1. A method for determining a computed tomography (CT) system parameter, wherein a CT system comprises an X-ray source and a detector;
- and the method comprises;
controlling a mould body to move between the X-ray source and a detection surface of the detector; and
acquiring X-ray projections of the mould body during movement on the detection surface, wherein the mould body has a first plane and a second plane perpendicular to each other, and the first plane and the second plane are always perpendicular to the detection surface during the movement of the mould body;determining a first straight line and a second straight line according to the acquired X-ray projections, wherein the first straight line is a straight line of a projection line segment of an edge of the first plane in boundary line segments of the acquired X-ray projections, the second straight line is a straight line of a projection line segment of an edge of the second plane in the boundary line segments of the acquired X-ray projections, a plane determined by the first straight line and a focus of the X-ray source is perpendicular to the detection surface, and a plane determined by the second straight line and the focus of the X-ray source is perpendicular to the detection surface; and determining an intersection point of the first straight line and the second straight line as coordinates of a foot of a perpendicular of the focus of the X-ray source on the detection surface, wherein a CT coordinate system parameter comprises the coordinates of the foot of the perpendicular. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
- and the method comprises;
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10-16. -16. (canceled)
Specification