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FIGURE 2. Retrospective ECG-gated reconstruction in patient with sinus rhythm (68 beats per minute), imaged with tube current modulation. White boxes indicate segment of R-R interval from which information will be used to reconstruct axial images. Bold white lines indicate time period of maximum tube current. In this patient, time used for image reconstruction starts at 65% of R-R interval and is well within time of tube current maximum. Tube current modulation should be used in patients with low and regular heart rates.
