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Illustration of ostia detection step. Two voxels with the maxima vesselness responses, O L and O R, are detected to be the ostia of the left and right coronary trees respectively. The angular search regions for the left and right ostium are θ L ∈ [−90∘, 45∘] and θ R ∈ (45∘, 135∘] respectively. θ = 90° indicates the anterior side of the patient
