67 2011
IMAGING & ONCOLOGY
Figure 2. ECG gating: The upper image demonstrates modulated retrospective ECG gating. The vertical blue columns (yellow arrow) indicate when the full mAs is being delivered, in this case in diastole, while the fainter light blue bars (green arrow) represent the reduced dose (20%) delivered in between the full dose periods. The lower image demonstrates prospective ECG gating in ‘step-and-shoot’ mode. An axial scan acquires a volume corresponding to the detector width in the z-axis, then the table moves to the next position and another volume is acquired in the same phase of the cardiac cycle, and so on until the entire heart has been covered. Usually three to four acquisitions are required.
Figure 3. Curved multiplanar reconstruction of the right coronary artery (RCA - left image) and left anterior descending artery (LAD – right image). Both arteries appear entirely normal. The white lines delineate the centre of rotation of these curved MPRs.
Figure 4. Curved MPR of the right coronary artery demonstrating multiple atheromatous plaques, some calcified, some not. The arrow points to a large soft plaque causing approximately 70 per cent stenosis.
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