Data processing apparatus, method of obtaining characteristic of each pixel and method of data processing, and program
Provided are a data processing apparatus a method of obtaining the characteristic of each pixel and a method of data processing, and a program. A data processing apparatus 100 to correct X-ray intensity data measured by a pixel detector includes a characteristic storage unit 130 to store the characteristic of each pixel in a specific detector, a correction table generation unit 120 to apply a measurement condition input as that in measurement by a specific detector and a value expressing the characteristic of each pixel to an approximate formula expressing the count value of each pixel and to generate a correction table for the specific detector using the calculation result of the approximate formula, and a correction unit 160 to correct the X-ray intensity data measured by the specific detector using the generated correction table.
1. A data processing apparatus that corrects X-ray intensity data measured by a pixel detector, comprising:
a characteristic storage unit to store a characteristic of each pixel in a specific detector;
a correction table generation unit to apply a measurement condition input as a desired measurement condition in measurement by the specific detector, and a value expressing the characteristic of each pixel to an approximate formula expressing a count value of the each pixel and to generate a correction table for the specific detector using a calculation result of the approximate formula, the value expressing the characteristic of each pixel being obtained as a result of uniformly diffused X-ray irradiation performed under measurement conditions at a time of preliminary preparation; and
a correction unit to correct X-ray intensity data using the generated correction table, the X-ray intensity data being measured by the specific detector under the input measurement condition.
2. The data processing apparatus according to claim 1 , wherein
the correction table generation unit uses a formula obtained by adding a formula expressing a primary count amount by X-ray irradiation and a formula expressing a count amount by charge sharing, as the approximate formula expressing the count value of each pixel.
3. The data processing apparatus according to claim 2 , wherein
the correction table generation unit uses a formula obtained by adding a formula expressing a count amount by noise and a formula expressing a count amount by other than the noise, as the approximate formula expressing the primary count amount by the X-ray irradiation.
4. The data processing apparatus according to claim 1 , wherein
the correction table generation unit calculates a correction coefficient for Flat-Field correction or distortion correction for each pixel using a calculation result of the approximate formula expressing the count value of each pixel.
5. The data processing apparatus according to claim 1 , wherein
the correction table generation unit specifies a bad pixel using a calculation result of the approximate formula expressing the count value of each pixel and a threshold value of the count value, and calculates a correction coefficient for complementing the bad pixel.
6. The data processing apparatus according to claim 1 , wherein
the input measurement condition in the measurement includes temperature around a measurement apparatus.
7. The data processing apparatus according to claim 1 , wherein
the input measurement condition in the measurement includes a kind of an X-ray source used for the measurement.
8. A method of obtaining the characteristic of each pixel stored in the data processing apparatus according to claim 1 , comprising the steps of:
uniformly irradiating the specific detector with an X-ray while changing a specific measurement condition, and recording a detection value of each pixel; and
calculating a characteristic of each pixel from the recorded detection value of each pixel.
9. A method of data processing for correcting X-ray intensity data measured by a pixel detector, comprising the steps of:
applying a measurement condition input as a desired measurement condition in measurement by a specific detector and a preliminarily stored value expressing a characteristic of each pixel in the specific detector to an approximate formula expressing a count value of the each pixel and generating a correction table for the specific detector using a calculation result of the approximate formula expressing the count value of each pixel, the value expressing the characteristic of each pixel being obtained as a result of uniformly diffused X-ray irradiation performed under measurement conditions at a time of preliminary preparation; and
correcting X-ray intensity data using the generated correction table, the X-ray intensity data being measured by the specific detector under the input measurement condition.
10. A computer readable non-transitory storage medium to store a program of data processing program for correcting X-ray intensity data measured by a pixel detector, the program causing a computer to execute processing comprising:
applying a measurement condition input as a desired measurement condition in measurement by a specific detector and a preliminarily stored value expressing a characteristic of each pixel in the specific detector to an approximate formula expressing a count value of the each pixel and generating a correction table for the specific detector using a calculation result of the approximate formula expressing the count value of each pixel, the value expressing the characteristic of each pixel being obtained as a result of uniformly diffused X-ray irradiation performed under measurement conditions at a time of preliminary preparation; and
correcting X-ray intensity data using the generated correction table, the X-ray intensity data being measured by the specific detector under the input measurement condition.