Figure 5a. Artifacts due to increased heart rate in a 46-year-old woman. The patient experienced alterations in heart rate in normal sinus rhythm during scanning, which was performed shortly after the sublingual administration of nitroglycerin. The patient’s average heart rate was 51 bpm, increasing to 69 bpm in the last third of the acquisition. Coronal (a) and sagittal (b) reformatted images of the heart obtained from CT data demonstrate banding artifacts (arrowheads), which were observed only in the last third.