Patent ID: 7342997
Filing Date: 2008-03-11
Classification: G01T

Abstract:
1. A method for measuring a dead time of a pulse type X-ray detector comprising: adopting a first condition and a second condition, each of the two conditions having a feature that the condition has plural setting states which can be changed with one another so that a state of an X-ray path from an X-ray source to the X-ray detector can be altered so as to vary an intensity of an X-ray received in the X-ray detector; adopting at least three setting states for the first condition; adopting a first setting state and a second setting state for the second condition so that: setting the first setting state for the second condition; carrying out a first observation in which the X-ray is emitted from the X-ray source and travels through the X-ray path and then is received in the X-ray detector so that an output of the X-ray detector is observed as a first observed X-ray intensity for each of the at least three setting states of the first condition; changing the first setting state to the second setting state for the second condition; carrying out a second observation in which the X-ray is emitted from the X-ray source and travels through the X-ray path and then is received in the X-ray detector so that an output of the X-ray detector is observed as a second observed X-ray intensity for each of the at least three setting states of the first condition; determining the ratio and the dead time in a manner that: storing the determined dead time in a storage device.