Patent ID: 8712135

Claim:
A method for image reconstruction according to projection data obtained by an asymmetric detector, said method comprises: dividing the projection data into Region 1 , Region 2 , Region 3 , Region 4 and Region 5 , Region 1 being an asymmetric region where there are detecting channels but no detecting channels symmetrical about a central channel, Region 2 being a transition region where there are detecting channels and there are also detecting channels symmetrical about the central channel, Region 3 being a symmetric region where there are detecting channels and there are also detecting channels symmetrical about the central channel, Region 4 being a transition region where there are detecting channels and there are also detecting channels symmetrical about the central channel, and Region 5 being a truncated region where there is no detecting channel; performing a view angle weighting on projection data in each of Region 1 , Region 2 , Region 3 , Region 4 , and Region 5 , wherein for an axial scan, said performing a view angle weighting further comprises weighting the projection data in the Regions such that weights of the projection data in Region 1 are 1, weights of the projection data in Region 3 are ½, weights of the projection data in Region 5 are 0, weights of the projection data in Region 2 are 1˜½, and weights of the projection data in Region 4 are ½˜0; and reconstructing a tomographic image of an irradiated subject from the weighted projection data.