1. A method for generating an image using an imaging system, said method comprising: accessing data of a scan of an object; delineating, via a processor, at least one item of interest in the accessed data using at least one physical characteristic, the at least one physical characteristic comprising at least one of a shape, a size, a density, a location, and a curvature of the at least one item of interest; setting a transparency value for a first set of pixels that do not represent the at least one item of interest according to a first set of rules; setting a transparency value for a second set of pixels that represent an interior portion of the at least one item of interest according to a second set of rules, the second set of rules being different than the first set of rules; setting a transparency value for a third set of pixels that represent a transition area between the first set of pixels and the second set of pixels according to a third set of rules, the third set of rules being different from the first set of rules and the second set of rules; generating an image of the object using the accessed scan data and the first, second, and third sets of rules, the image comprising a three-dimensional (3D) visualization image having transparency levels for the first set of pixels set according to the first set of rules, transparency levels for the second set of pixels set according to the second set of rules, and transparency levels for the third set of pixels set according to the third set of rules; and adjusting a transparency value for pixels representing the delineated at least one item of interest, wherein said adjusting the transparency value does not affect the transparency value for pixels in any other pixels of the image.