X-ray data processing apparatus and method and program for the same
The X-ray data processing apparatus to estimate a true value from an X-ray count value detected by the pixel array X-ray detector of a photon counting system includes a management unit 210 to receive and manage a detection value for each detection part, an effective area ratio calculation unit 230 to calculate a ratio of a detection ability under the influence of the charge share to an original detection ability in the detection part as an effective area ratio of the detection part using data regarding the detection part and data regarding an X-ray source and a detection energy threshold value, and a correction unit 250 to correct the managed count value using the calculated effective area ratio to estimate a true value.
1. An X-ray data processing apparatus that estimates a true value from an X-ray count value detected by a pixel array X-ray detector of a photon counting system, the apparatus comprising:
a management unit to receive and manage a count value for each detection part;
an effective area ratio calculation unit to calculate a ratio of a detection ability under influence of charge share to an original detection ability in the detection part as an effective area ratio of the detection part using data regarding the detection part and data regarding an X-ray source and a detection energy threshold value; and
a correction unit to correct the managed count value using the calculated effective area ratio to estimate a true value.
2. The X-ray data processing apparatus according to claim 1 , wherein
the effective area ratio calculation unit calculates the effective area ratio for each X-ray source and each detection energy threshold value, and
the correction unit expresses the calculated effective area ratio as a coefficient of simultaneous equations and performs linear transformation of a count value for each detection energy threshold value to a correction value for each X-ray source using the simultaneous equations.
3. The X-ray data processing apparatus according to claim 1 , wherein
the data regarding the detection part is data which is preliminarily stored in accordance with the detection part and expresses a size of the detection part and a distribution of charge spread within the detection part.
4. A method of X-ray data processing for estimating a true value from an X-ray count value detected by a pixel array X-ray detector of a photon counting system, the method comprising the steps of:
receiving and managing a count value for each detection part;
calculating a ratio of a detection ability under influence of charge share to an original detection ability in the detection part as an effective area ratio of the detection part using data regarding the detection part and data regarding an X-ray source and a detection energy threshold value; and
correcting the managed count value using the calculated effective area ratio to estimate a true value.
5. A computer readable non-transitory storage medium to store a program of X-ray data processing for estimating a true value from an X-ray count value detected by a pixel array X-ray detector of a photon counting system, the program causing a computer to execute a series of processing comprising the processes of:
receiving and managing a count value for each detection part;
calculating a ratio of a detection ability under influence of charge share to an original detection ability in the detection part as an effective area ratio of the detection part using data regarding the detection part and data regarding an X-ray source and a detection energy threshold value; and
correcting the managed count value using the calculated effective area ratio to estimate a true value.