A system and method are provided for providing freehand render start line drawing tools and automatic render preset selections. The method includes receiving a render start line drawn freehand via a user input device on a 2D image of a profile of a structure of interest. The method includes analyzing pixel intensity values within an area of the render start line. The method includes automatically selecting one of a plurality of sets of render mode presets based on pixel intensity values within an area of the render start line. Each of the plurality of sets of render mode presets is associated with a different rendering mode. Each of the rendering modes is associated with a different range of pixel intensity values. The method includes generating a volume rendering according to an automatically selected set of render mode presets. The method includes presenting a volume rendering in a display system.
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