Patent ID: 7672427

Claim:
An imaging system comprising: radiation generating means including at least one radiation source for generating radiations; data acquiring means including a detector matrix opposite to the radiation source for obtaining projection data by receiving radiations penetrated through an object to be inspected; transporting means for making the object to be inspected between the radiation source and the detector matrix linearly moving relative to the radiation source and the detector matrix; and controlling and image processing means for controlling the radiation generating means, the data acquiring means and the transporting means, and for reconstructing an image of the object to be inspected from the projection data; wherein the controlling and image processing means includes: a projection data conversion section for converting the projection data into projection data under quasi-parallel-beam scan; a filtration section for obtaining filtered projection data by convoluting the projection data under quasi-parallel-beam scan with a predetermined convolutional kernel; and a back-projection section for reconstructing the image by back-projecting the filtered projection data with a weighting factor; wherein the imaging system uses straight-line trajectory scan and straight-line filtered back projection, in which the filter section one-dimensionally convolutes the projection data in the direction of the line along which the object to be inspected is moving, and the back-projection section back-projects the filtered projection data in the direction of radiation projection.