Methods and systems for generating dual-energy images from a single-energy imaging system

A system, comprising:

• one or more processors;
• and
• memory storing instructions executable by the one or more processors to:
• obtain an image at a first energy level, the image reconstructed from projection data acquired at a single peak energy level;
• identify a contrast phase of the image with a contrast phase classifier model;
• enter the image as input into an energy transformation model trained to output a transformed image at a second energy level, different than the first energy level, the energy transformation model selected from among a plurality of energy transformation models based on the contrast phase;
• and
• display a final transformed image and/or save the final transformed image in memory, wherein the final transformed image is the transformed image or is generated based on the transformed image.

A method, comprising:

• obtaining an image of a subject at a first energy level, the image reconstructed from projection data acquired with a single-energy computed tomography (CT) imaging system;
• identifying a first contrast phase and a second contrast phase in the image with a contrast phase classifier model;
• selecting a first energy transformation model for the first contrast phase and a second energy transformation model for the second contrast phase;
• entering the image as input to the first energy transformation model and the second energy transformation model, each of the first energy transformation model and the second energy transformation model trained to output a respective transformed image at a second energy level based on the image at the first energy level;
• blending each respective transformed image to form a final transformed image at the second energy level;
• and
• displaying the final transformed image on a display device and/or saving the final transformed image in memory.