Multiplanar reformation of CT Scan Abdominal

MPR is the postprocessing technique used most commonly  and represents a simple reordering of the image voxels. A known limitation of MPR is that visualized structures must be in a same plane. Because most structures of interest are not within a single plane, a MPR cannot be created that demonstrates an entire structure (Fig. below).
image 
As structures course in and out of the MPR, pseudostenoses are created. To solve this problem, curved planar reformations (CPR) are used. CPR have a singlevoxel– thick tomogram, but it is capable of demonstrating an uninterrupted longitudinal cross-section as the display plane curves along the structure of interest
(Fig. below) .
image
CPR images can be obtained manually by drawing a line over a structure of interest or it can be produced automatically or semiautomatically by dedicated software. CPR provide the most useful luminal assessment (such as of blood vessels, airways, and bowel) and are useful in improving the visualization of vessels of small diameter or tortuous anatomy. CPR have an important limitation in that they are highly dependent on the accuracy of the curve .
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