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Radiographic image data correction method and apparatus and radiography apparatus (патент US № 8121256)

Официальная публикация
патента US № 8121256

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Классы МПК:A61B6/00 Приборы для радиодиагностики, например комбинированные с оборудованием для радиотерапии
Автор(ы):Yamada, Hideyuki (Kanagawa-ken, JP)
Kuwabara, Takao (Kanagawa-ken, JP)
Патентообладатель(и):FUJIFILM Corporation (Tokyo, JP)
Приоритеты:
подача заявки
05.06.2009
публикация патента
21.02.2012

РЕФЕРАТ (Abstract)

Offset correction based on offset correction data is performed on radiographic image data that have been read out from a radiation image detector, and the offset correction data are updated. In the offset correction method, correction data for low-frequency components and correction data for high-frequency components, as the offset correction data, are generated based on offset image data that have been read out from the radiation image detector while the radiation image detector is not irradiated with radiation. Further, the correction data for low-frequency components and the correction data for high-frequency components are separately updated.

ФОРМУЛА ИЗОБРЕТЕНИЯ (CLAIMS)

What is claimed is:

1. A radiographic image data correction method comprising the steps of: performing offset correction or sensitivity correction on radiographic image data representing a radiographic image, the radiographic image data having been read out from a radiation image detector that stores the radiographic image, by using correction data for correcting offset or sensitivity; generating, based on image data for correction which have been read out from the radiation image detector, low frequency component correction data for correcting the offset or sensitivity of low frequency components included in the radiographic image data, and high frequency component correction data for correcting the offset or sensitivity of high frequency components included in the radiographic image data, as the correction data; and updating the low frequency component correction data and the high frequency component correction data.

2. A radiographic image data correction method, as defined in claim 1, wherein a time interval of updating the correction data for high-frequency components is longer than a time interval of updating the correction data for low-frequency components.

3. A radiographic image data correction method, as defined in claim 1, wherein the number of pieces of the image data for correction that are used to generate the correction data for low-frequency components is smaller than the number of pieces of the image data for correction that are used to generate the correction data for high-frequency components.

4. A radiographic image data correction method, as defined in claim 1, wherein the image data for correction are obtained for each obtainment mode, and wherein the correction data for low-frequency components and the correction data for high-frequency components for each of the obtainment modes are generated and updated based on the image data for correction obtained for each of the obtainment modes.

5. A radiographic image data correction method, as defined in claim 1, wherein the correction data for high-frequency components are generated based on a plurality of pieces of image data for correction that have been used to update the correction data for low-frequency components a plurality of times.

6. A radiographic image data correction method comprising the steps of: performing offset correction and sensitivity correction on radiographic image data representing a radiographic image, the radiographic image data having been read out from a radiation image detector that stores the radiographic image, by using offset correction data for correcting offset and sensitivity correction data for correcting sensitivity; generating, based on image data for correction which have been read out from the radiation image detector, low frequency component offset correction data for correcting the offset of low frequency components included in the radiographic image data, high frequency component offset correction data for correcting the offset of high frequency components included in the radiographic image data, low frequency component sensitivity correction data for correcting the sensitivity of low frequency components included in the radiographic image data, and high frequency component sensitivity correction data for correcting the sensitivity of high frequency components included in the radiographic image data as the correction data; and updating the low frequency component offset correction data, the high frequency component offset correction data, the low frequency component sensitivity correction data, and the high frequency component sensitivity correction data separately; wherein a time interval of updating the offset correction data for low-frequency components is shorter than a time interval of updating the sensitivity correction data for low-frequency components, and wherein a time interval of updating the offset correction data for high-frequency components is shorter than a time interval of updating the sensitivity correction data for high-frequency components.

7. A radiographic image data correction apparatus comprising: a correction unit that performs offset correction or sensitivity correction on radiographic image data representing a radiographic image, the radiographic image data having been read out from a radiation image detector that stores the radiographic image, by using correction data for correcting offset or sensitivity; a generating unit that generates, based on image data for correction which have been read out from the radiation image detector, low frequency component correction data for correcting the offset or sensitivity of low frequency components included in the radiographic image data, and high frequency component correction data for correcting the offset or sensitivity of high frequency components included in the radiographic image data, as the correction data; and a correction data update unit that updates the low frequency component correction data and the high frequency component correction data separately.

8. A radiographic image data correction apparatus, as defined in claim 7, wherein the correction data update unit updates the correction data for high-frequency components at longer time intervals than updates of the correction data for low-frequency components.

9. A radiographic image data correction apparatus, as defined in claim 7, wherein the correction data update unit generates the correction data for low-frequency components by using a smaller number of pieces of image data for correction than generation of the correction data for high-frequency components.

10. A radiographic image data correction apparatus, as defined in claim 7, wherein the correction data update unit obtains the image data for correction for each obtainment mode, and generates and updates the correction data for low-frequency components and the correction data for high-frequency components for each of the obtainment modes based on the image data for correction obtained for each of the obtainment modes.

11. A radiographic image data correction apparatus, as defined in claim 7, wherein the correction data update unit generates the correction data for high-frequency components based on a plurality of pieces of image data for correction that have been used to update the correction data for low-frequency components a plurality of times.

12. A radiographic image data correction apparatus comprising: a correction unit that performs offset correction and sensitivity correction on radiographic image data representing a radiographic image, the radiographic image data having been read out from a radiation image detector that stores the radiographic image, by using offset correction data for correcting offset and sensitivity correction data for correcting sensitivity; a generating unit that generates, based on image data for correction which have been read out from the radiation image detector, low frequency component offset correction data for correcting the offset of low frequency components included in the radiographic image data, high frequency component offset correction data for correcting the offset of high frequency components included in the radiographic image data, low frequency component sensitivity correction data for correcting the sensitivity of low frequency components included in the radiographic image data, and high frequency component sensitivity correction data for correcting the sensitivity of high frequency components included in the radiographic image data as the correction data; and a correction data update unit that updates the low frequency component offset correction data, the high frequency component offset correction data, the low frequency component sensitivity correction data, and the high frequency component sensitivity correction data separately; wherein a time interval of updating the offset correction data for low-frequency components is shorter than a time interval of updating the sensitivity correction data for low-frequency components, and wherein a time interval of updating the offset correction data for high-frequency components is shorter than a time interval of updating the sensitivity correction data for high-frequency components.

13. A radiography apparatus comprising: a radiation irradiation unit including a radiation source that outputs radiation toward a subject and an irradiation field size limiting mechanism that limits the irradiation field size of the radiation output from the radiation source on the subject; a radiation image detector that detects the radiation that has been output by the radiation irradiation unit and transmitted through the subject, and records a radiographic image of the subject; a radiation image data obtainment unit that obtains radiographic image data representing the radiographic image stored in the radiation image detector; a correction unit that performs offset correction or sensitivity correction on the radiographic image data obtained by the radiographic image data obtainment unit by using correction data for correcting offset or sensitivity; a generating unit that generates, based on image data for correction which have been read out from the radiation image detector, low frequency component correction data for correcting the offset or sensitivity of low frequency components included in the radiographic image data, and high frequency component correction data for correcting the offset or sensitivity of high frequency components included in the radiographic image data, as the correction data; and a correction data update unit that updates the low frequency component correction data and the high frequency component correction data separately.

14. A radiography apparatus, as defined in claim 13, wherein the correction data update unit updates the correction data for high-frequency components at longer time intervals than updates of the correction data for low-frequency components.

15. A radiography apparatus, as defined in claim 13, wherein the correction data update unit generates the correction data for low-frequency components by using a smaller number of pieces of image data for correction than generation of the correction data for high-frequency components.

16. A radiography apparatus, as defined in claim 13, wherein the correction data update unit obtains the image data for correction for each obtainment mode, and generates and updates the correction data for low-frequency components and the correction data for high-frequency components for each of the obtainment modes based on the image data for correction obtained for each of the obtainment modes.

17. A radiography apparatus, as defined in claim 13, wherein the correction data update unit generates the correction data for high-frequency components based on a plurality of pieces of image data for correction that have been used to update the correction data for low-frequency components a plurality of times.

18. A radiography apparatus comprising: a radiation irradiation unit including a radiation source that outputs radiation toward a subject and an irradiation field size limiting mechanism that limits the irradiation field size of the radiation output from the radiation source on the subject; a radiation image detector that detects radiation that has been output by the radiation irradiation unit and transmitted through the subject, and records a radiographic image of the subject; a radiation image data obtainment unit that obtains radiographic image data representing the radiographic image stored in the radiation image detector; a correction unit that performs offset correction and sensitivity correction on the radiographic image data obtained by the radiographic image data obtainment unit by using offset correction data for correcting offset and sensitivity correction data for correcting sensitivity; a generating unit that generates, based on image data for correction which have been read out from the radiation image detector, low frequency component offset correction data for correcting the offset of low frequency components included in the radiographic image data, high frequency component offset correction data for correcting the offset of high frequency components included in the radiographic image data, low frequency component sensitivity correction data for correcting the sensitivity of low frequency components included in the radiographic image data, and high frequency component sensitivity correction data for correcting the sensitivity of high frequency components included in the radiographic image data as the correction data; and a correction data update unit that updates the low frequency component offset correction data, the high frequency component offset correction data, the low frequency component sensitivity correction data, and the high frequency component sensitivity correction data separately; wherein a time interval of updating the offset correction data for low-frequency components is shorter than a time interval of updating the sensitivity correction data for low-frequency components, and wherein a time interval of updating the offset correction data for high-frequency components is shorter than a time interval of updating the sensitivity correction data for high-frequency components.


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