Medical injectors and injector systems for diagnostic and therapeutic procedures including injectors, injector systems, syringes and disposables for diagnostic imaging such as magnetic resonance imaging, contrast radiography and angiography, computer tomography, ultrasound procedures; contrast delivery systems for delivering contrast media to patients for radiographic, angiographic, computed tomography, ultrasound and magnetic resonance imaging procedures; anatomical conformable surface coils and probes, automatic tuning devices, anatomical positioning devices, sound systems, patient and physiological monitoring devices; devices for monitoring ECG signals, blood oxygen levels, pulse rate, respiration rate, temperature, blood pressure and/or anaesthesia agent level, for use with magnetic resonance imaging systems