Patent ID: 8487264
Filing Date: 2013-07-16
Classification: A61B,G01T

Abstract:
1. Radiation tomography apparatus comprising: a detector ring having radiation detecting elements for detecting radiation arranged in an arc shape; a coincidence device for counting a number of coincident events as a frequency where a first radiation detecting element and a second radiation detecting element coincidently detect radiation; a position specifying device for outputting positional information as a line connecting the first radiation detecting element and the second radiation detecting element; and a correlated data storing device for storing correlated data having the number of coincident events and corresponding positional information correlated therewith, the detector ring having an array portion where radiation detecting elements for detecting radiation are arranged and a fracture portion where no radiation detecting element is arranged, the apparatus further comprising: a correlated data complementation device for complementing correlated data on the fracture portion by calculating the number of coincident events and positional information corresponding thereto based on the correlated data under assumption that the first radiation detecting element is in the fracture portion for storing the number of coincident events and the positional information to the correlated data complementation device in addition; a detection efficiency acquisition device for acquiring a radiation detection efficiency in each radiation detecting element arranged in the detector ring by use of the correlated data and the correlated data through complementation; and a correction device for correcting a radiological image in accordance with the radiation detection efficiency.