Using detectability index to determine X-ray tube current
AssigneeToshiba Medical Systems Corporation
InventorsKirsten Boedeker, Satoru Nakanishi
Life of this patent
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Abstract
A computed tomography (CT) image apparatus includes an X-ray source to emit X-rays; and processing circuitry configured to receive a desired detectability index set by a user, the desired detectability index determining for a desired image quality of a CT scan of an object; determine an X-ray tube current that will result in the desired detectability index set by the user; and cause the X-ray source to perform a scan of the object using the determined tube current.
Claims6
A computed tomography (CT) apparatus, comprising:
- an X-ray source to emit X-rays;
- and
- processing circuitry configured to
- receive a desired detectability index set by a user, the desired detectability index determining a desired image quality of a CT scan of an object;
- determine an X-ray tube current that will result in the desired detectability index set by the user;
- and
- cause the X-ray source to perform a scan of the object using the determined tube current,
- wherein the desired detectability index is proportional to a module transfer function and an object function, and is inversely proportional to a noise power spectrum, and wherein the processing circuitry is further configured to calculate the module transfer function based on dimensions of the object, an input tube current, a contrast value, and scanning and reconstruction parameters.
A computed tomography (CT) imaging method for a CT apparatus that includes an X-ray source configured to emit X-rays, comprising:
- receiving a desired detectability index set by a user for a desired image quality of a CT scan of an object;
- determining an X-ray tube current that will result in the desired detectability index set by the user;
- and
- causing the X-ray source to perform a scan of the object using the determined tube current,
- wherein the desired detectability index is proportional to a module transfer function and an object function, and is inversely proportional to a noise power spectrum, and wherein determining the X-ray tube current further comprises calculating the module transfer function based on dimensions of the object, an input tube current, a contrast value, and scanning and reconstruction parameters.
A non-transitory computer-readable medium storing executable instructions, which, when executed by processing circuitry of a CT apparatus that includes an X-ray source configured to emit X-rays, cause the processing circuitry to execute a method comprising:
- receiving a desired detectability index set by a user for a desired image quality of a CT scan of an object;
- determining an X-ray tube current that will result in the desired detectability index set by the user;
- and
- causing the X-ray source to perform a scan of the object using the determined tube current,
- wherein the desired detectability index is proportional to a module transfer function and an object function, and is inversely proportional to a noise power spectrum, and wherein determining the X-ray tube current further comprises calculating the module transfer function based on dimensions of the object, an input tube current, a contrast value, and scanning and reconstruction parameters.
A computed tomography (CT) apparatus, comprising:
- an X-ray source to emit X-rays;
- and
- processing circuitry configured to
- receive a desired detectability index set by a user, the desired detectability index determining a desired image quality of a CT scan of an object;
- determine an X-ray tube current that will result in the desired detectability index set by the user;
- and
- cause the X-ray source to perform a scan of the object using the determined tube current,
- wherein the desired detectability index is proportional to a module transfer function and an object function, and is inversely proportional to a noise power spectrum, and wherein the processing circuitry is further configured to calculate the object function by determining a diameter and a contrast value from an image of the object.
A computed tomography (CT) imaging method for a CT apparatus that includes an X-ray source configured to emit X-rays, comprising:
- receiving a desired detectability index set by a user for a desired image quality of a CT scan of an object;
- determining an X-ray tube current that will result in the desired detectability index set by the user;
- and
- causing the X-ray source to perform a scan of the object using the determined tube current,
- wherein the desired detectability index is proportional to a module transfer function and an object function, and is inversely proportional to a noise power spectrum, and wherein determining the X-ray tube current further comprises calculating the object function by determining a diameter and a contrast value from an image of the object.
A non-transitory computer-readable medium storing executable instructions, which, when executed by processing circuitry of a CT apparatus that includes an X-ray source configured to emit X-rays, cause the processing circuitry to execute a method comprising:
- receiving a desired detectability index set by a user for a desired image quality of a CT scan of an object;
- determining an X-ray tube current that will result in the desired detectability index set by the user;
- and
- causing the X-ray source to perform a scan of the object using the determined tube current,
- wherein the desired detectability index is proportional to a module transfer function and an object function, and is inversely proportional to a noise power spectrum, and wherein determining the X-ray tube current further comprises calculating the object function by determining a diameter and a contrast value from an image of the object.
Dependencies are inferred from the claim text.