The technology still has some way to go as frame rates, transducer size and resolution improve.
Participants were instrumented for collection of continuous R-R intervals with a lead II electrocardiogram (Colin Pilot 9200, Colin Medical Instruments, San Antonio, Texas) and respiratory rate by belt transducer (Pneumotrace II, ADInstruments, Colorado Springs, Colorado) secured around the thorax.
The volume spirometer was found to be more advantageous in conducting tests at remote field stations than the water spirometer and other electronic instruments which measure flow rate with a transducer element.
The objective is to maximize network lifetime while fulfilling diversified coverage constraints, i.e., different targets may require different sensing quality in terms of the number of transducers, sampling rate, sensing data rate, etc.
This model consistently explains physiological excitation, adaptation, and experimental data on transient transducer demethylation rates.
A frame rate (1 frame = each transducer has been excited) of 1.6 Hz and a helium fraction resolution of 1.5% in steam are achieved.
Briefly, cardiac function was assessed by transthoracic echocardiography (Sonos 5500, Agilent, Andover, MA) with a 15-MHz high frequency linear transducer and frame rate of 100 frames/s.
Using a voice-coil actuator and motor controller to laterally move the ultrasound transducer at a rate of 0.5 mm/s, a one-to-one, interlaced ultrasound-photoacoustic B-scan image was formed of all five test tubes.
The following cardiac parameters were monitored in unpaced hearts: coronary flow (as index of coronary arterial function) with a transonic flow probe, left-ventricular developed pressure via a fluid-filled balloon that was inserted into the left ventricle and connected to a pressure transducer, and heart rate, derived electronically from the pressure signal.
Even with dedicated transducer covers, perforation rates appear to be quite high, although there is a paucity of literature and newer materials may prove to be safer [55, 56, 57].
