3D-DOCTOR is a sophisticated software solution designed for 3D modeling, image processing, and measurement across various imaging modalities, including MRI, CT, PET, and microscopy, as well as scientific and industrial applications. It accommodates both grayscale and color images in multiple formats such as DICOM, TIFF, Interfile, GIF, JPEG, PNG, BMP, PGM, MRC, RAW, and more. This powerful software generates 3D surface models and performs volume rendering from 2D cross-sectional images in real-time on your computer. Users can export polygonal mesh models in various formats, including STL, DXF, IGES, 3DS, OBJ, VRML, PLY, and XYZ, making it suitable for applications like surgical planning, simulation, quantitative analysis, finite element analysis, and rapid prototyping. In addition, it allows for 3D volume calculations and other measurements crucial for quantitative insights. The vector-based tools enhance the ease of handling image data, facilitating measurement and analysis efficiently. Moreover, 3D CT and MRI images can be re-sliced along any chosen axis, and it is capable of registering multi-modality images to produce comprehensive image fusions, ensuring a versatile approach to imaging challenges.