Arabinogalactan compositions are provided which are useful in a wide variety of different biomedical applications. The method also includes, based on the received signal quality information and the received location information, identifying a first region of an area, the first region having a first signal quality. 5 to 13% by atom on indium and silicon totaled; and a transparent conductive thin film comprising indium oxide as the major component and tungsten and germanium, wherein tungsten is incorporated at a WIn atomic ratio of 0. Alternatively, after an OFDM modulation for at least one antenna, the time sequence of the time-dependent signal generated on the basis of the OFDM modulation is reordered. The external ultrasonic transducer preferably can include an attached handle operative to position the transducer in a predetermined orientation to the patient’s heart.