The invention provides for a medical instrument (100, 300) comprising: a subject support (110) comprising a support surface (112); a camera system (118); and a signal system (148). The execution of the machine executable instructions (152) cause a processor (142) controlling the medical instrument to: receive (400) a list of selected objects (160) each with a selected coordinate (162); and signal (402) the list of selected objects. The Execution of the machine executable instructions further causes the processor to repeatedly: acquire (404) the camera data using the camera system; input (406) the camera data into a neural network to generate a list of placed objects (166); determine (408) a list of missing objects (168) by comparing the list of selected objects to the list of placed objects; indicate (410) using the signal system the list of missing objects; determine (412) a list of misplaced objects (170) by comparing the selected coordinate for each of the list of objects to the coordinates of the placed objects on the support surface; and indicate (414) using the signal system the list of misplaced objects.