An imaging device includes an illumination module comprising at least one emitter for emitting at least one excitation beam; a scanning and injection module comprising an image guide, a proximal end and a distal end of which are linked by a plurality of optical fibers; a scanning and injection optical system configured to alternately inject the at least one excitation beam into an optical fiber of the image guide from the proximal end of the image guide; a detection module comprising a detector for detecting a luminous flux collected at the distal end of the image guide, wherein at least one of the illumination module and the detection module is optically conjugated with the scanning and injection module using a conjugating optical fiber.