An ultrasound imaging system comprising: an ultrasound transducer configured to acquire echo signals responsive to ultrasound pulses transmitted toward a region of interest; one or more processors in communication with the ultrasound transducer and configured to: receive a plurality of image frames generated from the ultrasound echoes; determine, for each image frame of the plurality of image frames, whether a target anatomical feature is present in the image frames; and generate, for each of the image frames of the plurality of image frames, index information based on a confidence level indicating the target anatomical feature is present in the given image frame; and a user interface in communication with the one or more processors and configured to display a visual representation of the index information, characterised in that the visual representation comprises a marker (302, 402) associated with the target anatomical feature, and that the visual representation further includes a first axis representing an order of the plurality of image frames and that the marker is located on the first axis at a location representing the given image frame where the target anatomical feature is present. an ultrasound transducer configured to acquire echo signals responsive to ultrasound pulses transmitted toward a region of interest; one or more processors in communication with the ultrasound transducer and configured to: receive a plurality of image frames generated from the ultrasound echoes; determine, for each image frame of the plurality of image frames, whether a target anatomical feature is present in the image frames; and generate, for each of the image frames of the plurality of image frames, index information based on a confidence level indicating the target anatomical feature is present in the given image frame; and a user interface in communication with the one or more processors and configured to display a visual representation of the index information, characterised in that the visual representation comprises a marker (302, 402) associated with the target anatomical feature, and that the visual representation further includes a first axis representing an order of the plurality of image frames and that the marker is located on the first axis at a location representing the given image frame where the target anatomical feature is present. receive a plurality of image frames generated from the ultrasound echoes; determine, for each image frame of the plurality of image frames, whether a target anatomical feature is present in the image frames; and generate, for each of the image frames of the plurality of image frames, index information based on a confidence level indicating the target anatomical feature is present in the given image frame; and a user interface in communication with the one or more processors and configured to display a visual representation of the index information, characterised in that the visual representation comprises a marker (302, 402) associated with the target anatomical feature, and that the visual representation further includes a first axis representing an order of the plurality of image frames and that the marker is located on the first axis at a location representing the given image frame where the target anatomical feature is present.