Tuesday, October 27, 2009

3D imaging


MIP is avolume visualization method for 3D data that projects in the visualization plane the voxels with maximum intensity that fall in the way of parallel rays traced from the viewpoint to the plane of projection. This implies that 2 MIP rendrings from opposite viewpoints are symmetrical images.

septal infarct




on the right 4 chamber view of the heart
picture on the left 2 chamber view of the heart

maximum intensity projections

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AJR Am J Roentgenol. 1999 Apr;172(4):925-31.

Pancreaticoduodenal arcades and dorsal pancreatic artery: comparison of CT angiography with three-dimensional volume rendering, maximum intensity projection, and shaded-surface display.
Hong KC, Freeny PC.

Department of Radiology, University of Washington School of Medicine, Seattle 98195, USA.

OBJECTIVE: The objective of this study was to compare the ability of CT angiography to depict the pancreaticoduodenal arcades and the dorsal pancreatic artery using the techniques of three-dimensional (3D) volume rendering, maximum intensity projection (MIP), and shaded-surface display (SSD). SUBJECTS AND METHODS: Twenty-seven patients were selected at random from a group of 42 patients undergoing arterial-phase helical CT angiography before liver transplantation. CT angiograms were constructed from identical data sets using 3D volume rendering, MIP, and SSD. RESULTS: Seventy-two vessels were evaluated in 27 patients. Three-dimensional volume rendering depicted 24 anterior and 22 posterior arcades and 26 dorsal pancreatic arteries; combined MIP and SSD depicted 14 anterior and 13 posterior arcades and 19 dorsal pancreatic arteries. Thirty vessels with diameters of between 2 and 3 mm were well seen with 3D volume rendering but were incompletely depicted with MIP and SSD. Sixteen vessels with diameters of greater than 3 mm were well seen using all three techniques. Twenty-six vessels with diameters of less than 2 mm were faintly seen with 3D volume rendering but were unidentifiable with MIP and SSD. CONCLUSION: Three-dimensional volume rendering is superior to MIP and SSD in the depiction of pancreaticoduodenal arcades and dorsal pancreatic arteries. Unlike the other rendering techniques, 3D volume rendering can also show relationships between these vessels and pancreatic parenchyma and adjacent structures.

PMID: 10587122 [PubMed - indexed for MEDLINE]


Publication Types, MeSH Terms

Thursday, October 22, 2009

Friday, October 16, 2009

Thursday, October 15, 2009

Brain Maximum Intensity Projection




This is an image, MRI coronal brain, maximum intesity projection.