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US 7,127,030 B2Granted
Area exposure dosimetry and area absorbed dosimetry
AssigneeCanon Kabushiki Kaisha
InventorMasahiro Tamegai
Life of this patent
Estimating the term…
Abstract
The area of an irradiation region, and at least one of the area of an object region and the area of a non-object region in a radiation image obtained by radiographing an object are calculated. The effective dose of radiation from a radiation generator is acquired. An area exposure dose, the X-ray amount radiated on the object, is calculated on the basis of the area of the irradiation region, one of the area of the object region and the area of the non-object region, and an effective dose.
Claims8
An area exposure dosimetry method comprising:
- acquiring a radiation image obtained by radiographing an object;
- detecting points in the radiation image where change in signal levels of the radiation image is higher than a predetermined threshold;
- connecting the detected points to make a contour;
- calculating at least one of an area of an object region and an area of a non-object region in the radiation image in accordance with the contour;
- acquiring an effective dose of radiation from a radiation generator;
- and
- calculating an area exposure dose as a radiation dose of the object on the basis of an area of the irradiation region in the radiation image, the calculated one of the area of the object region and the area of the non-object region, and the effective dose.
4 more elements
An area exposure dosimetry apparatus comprising:
- an acquisition unit that acquires a radiation image obtained by radiographing an object;
- a region determining unit that detects points in the radiation image where change in signal levels of the radiation image is higher than a predetermined threshold and connects the detected points to make a contour, and calculates at least one of an area of an object region and an area of a non-object region in the radiation image in accordance with the contour made by said region determining unit;
- an acquisition unit that acquires an effective dose of radiation from a radiation generator;
- and
- a dose calculating unit that calculates an area exposure dose as a radiation dose of the object on the basis of an area of the irradiation region in the radiation image, the calculated one of the area of the object region and the area of the non-object region, and the effective dose.
2 more elements
Dependencies are inferred from the claim text.