Figures & data
Figure 1. Transducers for interstitial applications: (a) Tip of a dual mode intracardiac ablation tool. The applicator consists in a 112-element imaging array surround by a coagulating ring (Courtesy of KL Gentry). (b) Multi-element cylindrical transducers for coagulation in prostate under MR guidance (Courtesy of CJ Diederich and WH Nau). (c) 64-element cylindrical array for treating oesophageal tumours. Plane waves are reconstructed and rotated electronically. (d) Intracardiac catheter producing focused coagulation around the pulmonary vein for treating atrial fibrilation (Courtesy of DA Smith, ProRhythm, Inc.).
Figure 2. (a) Temperature map acquired in vivo during an ultrasound exposure using interstitial applicator. The applicator is positioned in the oesophagus. The absolute temperature scale 42–47°C for the regions shown in blue, 48–52°C for regions in green, and above 53°C for regions in red. (b) Fluoroscopic image for positioning an endoscopic ultrasound applicator in the bile duct and treating cholangiocarcinoma. 1–Ultrasound therapeutic transducer, 2–Applicator, 3–Guide wire, 4–Endoscope.
