The present invention relates to an ultrasound imaging system (100) comprising: an ultrasound probe (10) that comprises a single element ultrasound transducer (16) for transmitting an receiving ultrasound signals； a movement sensor (18) for sensing a displacement-over-time signal x(t) of a displacement (x) of the ultrasound probe (10) relative to an examination object (24) during signal acquisition； an image acquisition hardware (26) that is configured to reconstruct an M-mode ultrasound image from the received ultrasound signals, said reconstructed M-mode ultrasound image being a two-dimensional image I(t,y) comprising multiple one-dimensional depth signals of substantially constant depth (y) in the examination object (24) illustrated over time (t), wherein the image acquisition hardware (26) is further configured to map said M-mode ultra-sound image I(t,y) to a two-dimensional second image I(x,y) comprising the depth signals illustrated over the displacement (x) by using the displacement-over-time signal x(t) that is sensed with the movement sensor (18)； and an image analysis unit (48) that is configured to analyse said second image and to detect at least one tissue layer boundary of the examination object (24) in said second image.
