Over one planar reconstruction (MPR multiplanar reconstruction)
An XYZ three tangential plane at any point of the object to obtain three cut, and X / Y / Z-axis can be rotated three
2 Maximum intensity projection (MIP)
The maximum intensity projection is a thickness (i.e., the layer thickness CT) CT value of the maximum voxel is projected onto the background plane, to show a high density of reinforcing all or part of the vessels and / or organs
Since this method shows a certain thickness of the image voxel highest CT value, the change in thickness of the image will have an impact, as shown in FIGS. 6 and 7.
FIG 6 (a layer thickness of 5mm)
(Thickness of 15mm) Figure 7
It is not that the MIP image slice thickness 5mm veins narrow door, and the door thickness of 15mm MIP image pulse is normal?
So thickness of choice is important, neither too thin (part of the lumen of the blood vessel thickness and may be outside), but not too thick (surrounding tissues and organs have interference), this is a very technical test radiologist and clinical experience .
This technique has a twin MIP - minimum intensity projection (minIP), and MIP contrary, reflects a certain minimum thickness of the CT image voxel value, we used to show biliary tract, airway and other organizational structure, FIG. 10.
Minimum intensity projection 10 in FIG.
3 shaded surface covering (SSD)
Shaded surface covering is assumed that the operator's eyes as the direction of the light source, the CT value is no longer projected to continue through image on the set of voxels above a threshold, only the set of three-dimensional graphics rendering all surfaces of voxels, adapted to display CT value and other structures quite different organizational structures imaging ...... (Business There, I said that the Chinese really, if that can not understand, continue to look below ......) put some ground gas, SSD image like a black and white image shaping Therefore clinically used mainly for displaying CT reconstruction of bone lesions or colon, as shown in FIGS. 11 and 12.
FIG 11 SSD image (bone) in FIG. 12 SSD images (colon)
4 VRT (VRT)
5 Surface Reconstruction (CPR)
6 virtual endoscopy (VE)