An ultrasound transducer device and control system disclosed here have the capability of storing information regarding the position of the transducer at which one ultrasound image is taken during an initial scan, and using the stored information to guide an operator to return the transducer to the same position during a subsequent scan. During the first scan, skin patterns are detected by a sensor, such as an optical sensor, capacitive sensor, or ultrasound sensor, and stored. During the subsequent scan, skin patterns are detected again, and compared to the stored skin pattern. A guidance message is generated based on the comparison to guide the user to return the ultrasound transducer device to the same position of the first scan.
