MODEL RELEASED. Echocardiography. Senior patient undergoing a heart ultrasound scan. A transducer,held against his chest (emits ultrasonic waves) and detects the reflected echoes. The change in frequency is used to build images (on screen at top) of the heart structures and to assess the velocity and direction of blood flow | |
Lizenzart: | Lizenzfrei |
Credit: | Science Photo Library / Hooton, Ian |
Modell-Rechte: | vorhanden |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |