Electrical impedance detection and ultrasound scanning of body tissue

An apparatus for performing electrical impedance detection and ultrasound scanning of body tissue, the apparatus comprising:

• an electrode array configured to perform electrical impedance detection, the electrode array being configured to apply a first electrical signal to the body tissue, to receive an electrical response signal characteristic of the body tissue, and to provide a first output signal representative of the electrical response signal;
• and
• an ultrasound transducer configured to perform ultrasound scanning, the ultrasound scanner being configured to apply a first ultrasound signal to the body tissue, to receive an ultrasound response signal characteristic of the body tissue, and to provide a second output signal representative of the ultrasound response signal,
• wherein the ultrasound transducer is mounted so as to be moveable, during performance of the ultrasound scanning when the ultrasound transducer is used to receive the ultrasound response signal, along a path that is fixed relative to a location of the electrode array, when the electrode array is used to receive the electrical response signal to achieve temporal and spatial correlation of the ultrasound response signal and the electrical response signal.