Thomas Heldt

Senior Member, IEEE. Institute for Medical Engineering and Science, and the Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139 USA.

Associated articles

TBME, Featured Articles
Model-Based Estimation of Respiratory Parameters from Capnography, with Application to Diagnosing Obstructive Lung Disease
Capnography is the noninvasive and effort-independent measurement of carbon dioxide concentration in exhaled breath, as a function of time or exhaled volume. Time-based capnography – the focus of this paper – is widely used in ambulances and hospitals. However, its quantitative... Read more
JTEHM, Articles
Adaptive Maximal Blood Flow Velocity Estimation From Transcranial Doppler Echos
Objective: Novel applications of transcranial Doppler (TCD) ultrasonography, such as the assessment of cerebral vessel narrowing/occlusion or the non-invasive estimation of intracranial pressure (ICP), require high-quality maximal flow velocity waveforms. However, due to the low signal-to-noise ratio of TCD spectrograms,... Read more
TBME, Featured Articles
Distortion of the Intracranial Pressure Waveform by Extraventricular Drainage System
The EVD-based pressure measurement occurs at the distal end of fluid filled elastic tubing that may itself act as a filter and distort the waveform. While the frequency response of arterial catheter systems has been studied extensively to understand their transfer function characteristics for detailed waveform analysis of the arterial blood pressure wavelet, the degree to which the EVD and associated drainage system distort the ICP waveform has not been investigated systematically, yet... Read more