Tuning method for collimator, controller, collimator and CT machine
AssigneeSiemens Healthineers AG
InventorsJia Peng Zhu, Li Dong Zhang, Jian Zhang, Ji Feng Zhao, Feng Hai Yu
Life of this patent
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Abstract
A tuning method for a collimator of a CT machine, which, in each cycle of X-ray scan operation and stop, may include determining whether an X-ray is generated from the anode plate; calculating the Z-direction heating displacement of the slot plate during the current scan based on a detected X-ray, driving the slot plate to move by the heating displacement in the Z-direction, calculating the total Z-direction heating displacement of the slot plate at the end of the current scan, calculating the cooling displacement of the slot plate during the current stop based on the stop time of the X-ray, and driving the slot plate to move.
Claims18
A tuning method for a collimator of a CT machine having an anode plate, the collimator having a slot plate, the tuning method comprising:
- determining whether an X-ray is generated from the anode plate;
- calculating, using a controller of the collimator, a Z-direction heating displacement amount to move the slot plate during a current scan based on a determination of the X-ray being generated;
- driving, using the controller, the slot plate to move by the Z-direction heating displacement amount to compensate for displacement of the slot plate in a direction opposite to a Z-direction displacement amount as a result of thermal expansion of the anode plate;
- calculating, using the controller and based on the determination of the X-ray being generated, a total Z-direction heating displacement of the slot plate at the end of the current scan;
- calculating, via the controller and based on a stop time of the X-ray, a cooling displacement of the slot plate during a current stop stage by using a linear model that provides a linear relationship between a thermal coefficient of the anode plate and the stop time to predict the cooling displacement of the slot plate;
- and
- prior to a start of a subsequent scan, driving, using the controller and based on the calculated cooling displacement of the slot plate, the slot plate to move in a direction that is opposite to the Z-direction heating displacement amount.
A controller for a collimator of a CT machine, comprising:
- one or more processors;
- and
- memory storing instructions that, when executed by the one or more processors, configure the controller to:
- determine whether an X-ray is generated from an anode plate;
- calculate a Z-direction heating displacement amount to move a slot plate during a current scan based on a determination of the X-ray being generated;
- control a drive to drive the slot plate to move by the Z-direction heating displacement amount to compensate for displacement of the slot plate in a direction opposite to a Z-direction displacement amount as a result of thermal expansion of the anode plate;
- calculate, based on the determination of the X-ray being generated, a total Z-direction heating displacement of the slot plate at the end of the current scan;
- calculate, based on a stop time of the X-ray, a cooling displacement of the slot plate during a current stop stage by using a linear model that provides a linear relationship between a thermal coefficient of the anode plate and the stop time to predict the cooling displacement of the slot plate;
- and
- prior to a start of a subsequent scan, control the drive to drive the slot plate to move, based on the calculated cooling displacement, in a direction that is opposite to the Z-direction heating displacement amount.
Dependencies are inferred from the claim text.