The Application Of Computer Digital Image Processing Technology In Pet Imaging

1. Surface shaded display for brain PET imagingObjective To develop a program for brain PET imaging using surface shaded display (SSD).Methods The original brain PET data were transferred to a personal computer by local area network, and scaled into 256 gray scale between 0 and 255. An appropriate threshold was selected with the percentage of the maximal value. The list of vertices and triangles describing the contour surface was produced with a high resolution three dimensional (3D) surface construction algorithm.Results The software of SSD for brain PET imaging with interactive user interface can produce 3D brain PET imaging which can be rotated, scaled, and saved or outputted with several image formats.Conclusion The method of SSD for brain PET imaging can directly and integrally reflect the surface of brain cortex, and be helpful to locate lesions and display the range of lesions, but can not reflect the severity of lesions, nor can display the structure under brain cortex.2. Multi-planar volume reconstruction for PET imaging.Objective To establish a method of multi-planar volume reconstruction for PET imaging, including maximum intensity projection (MIP) and average intensity projection (AIP).Methods Dynamic ¹³N-NH₃ PET imaging was performed on 7 patients, and dynamic ¹⁸F-FDG PET imaging was done on 2 patients. The volume data of ¹³N-NH₃ and ¹⁸F-FDG PET imaging were inputted to a PC computer by local area network. The primitive PET volume data were converted to 8 bit byte type, and scaled to the range of 0-255. The data coordinates were converted to normalized coordinates by three-dimensional coordinate conversion, and then the MIP and AIP were generated...