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Figure 3: Selective injection in the LCA in the PA view in a 2-year-old s/p orthotopic heart transplant (a) Is taken with the radiation grid in place and the detector immediately above the chest (b) Is taken without the radiation grid using the "air gap" technique. Image quality is comparable between the two

Figure 3: Selective injection in the LCA in the PA view in a 2-year-old s/p orthotopic heart transplant (a) Is taken with the radiation grid in place and the detector immediately above the chest (b) Is taken without the radiation grid using the