Devices, systems, and methods for imaging within a body lumen

An apparatus comprising:

• a processor;
• a first transducer;
• a second transducer positioned distal to the first transducer;
• and
• a memory comprising instructions that, when executed by the processor, cause the processor to:
• position the second transducer within at least a portion of a focal region of the first transducer,
• generate a first image with the first transducer, the first image configured to include a characteristic of a wall of a body lumen, the wall of the body lumen comprising a duodenal wall,
• generate a second image with the second transducer, the second image configured to include a characteristic beyond the wall of the body lumen that comprises a duct beyond an entry point in the wall of the body lumen, the duct selected from a bile duct and a pancreatic duct,
• create a combined image comprising the characteristic of the wall of the body lumen and the characteristic beyond the wall of the body lumen based on the first image and the second image, and
• determine a trajectory visualization based on the first and second images, the trajectory visualization selected from a biliary duct trajectory visualization and a pancreatic duct trajectory visualization;
• the first transducer comprising an optical sensor, the first image comprising an optical image, the second transducer comprising an ultrasonic transducer, and the second image comprising an ultrasound image.