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Figure 2d: Image postprocessing methods used in analysis of right coronary artery. (a) Transverse images. Operators could interactively move up and down stack of transverse images, which were reconstructed with 1.0-mm section thickness and 0.5-mm increment. Shown here is origin of the right coronary artery (arrow). (b) Oblique MPR. Operators could interactively and freely manipulate position and orientation of imaging plane. Right coronary artery image section was 1.0 mm thick (arrows). (c) Oblique MIP. Operators could interactively and freely manipulate position and orientation of image, consisting of a 5-mm section, displaying attenuation for each image pixel. This form of reconstruction allows depiction of longer segments of a given coronary artery. Section position and orientation of c are identical to those of b (arrow = right coronary artery). (d, e) Curved MPR. By using transverse and coronary images as reference, the artery course was interactively traced by an independent operator. A 1-mm MPR image was rendered, the plane of which followed the outlined trace. Images d and e show the resulting display of the right coronary artery (arrow). (f, g) Curved MIP. As with d and e, the course of the right coronary artery is traced. The image is then displayed as an MIP (3 mm thick). Images f and g show the resulting display of the right coronary artery (arrow). (h) Three-dimensional reconstruction. Image data set was segmented by an independent operator and subsequently displayed as 3D surface-weighted VRT image. The images could be viewed from any desired angle to assess the course of all arteries (arrows = right coronary artery). (i) Corresponding conventional coronary angiogram (arrow = right coronary artery) of the same patient.
