Abstract: A circulatory system monitor may include a sensor array having a plurality of sensor assemblies and a controller in communication with the sensor array. The sensor array may be configured to be pressed against a patient's body and the controller may identify a sensor assembly of the plurality of sensor assemblies from which a signal is to be used to determine a circulatory system parameter of the patient's body. The controller may use a signal from the identified sensor assembly to determine the circulatory system parameter. The circulatory system monitor may include an inflatable member and a pump. The configuration of the sensor array and the inflatable member may facilitate ensuring alignment of at last one sensor assembly of the sensor array with a target artery to be monitored.