Central venous pressure (CVP) is a good surrogate for right atrial pressure, making it useful for assessing heart-related diseases. However, CVP is commonly assessed using invasive venous catheterization, rendering it infeasible for routine monitoring. Photoplethsymographic imaging (PPGI) is a biophotonic system that has recently shown to be capable of assessing the jugular venous pulse (JVP) waveform in a non-contact, widefield manner. Here, we monitored the effect of increased venous pressure on the JVP using a non-contact PPGI system. In this case study, the participant (22 year old healthy male) was positioned in a supine, right-tilted position so that the arm was below heart level with a continuous column of blood between the basilic vein and the right atrium to estimate CVP. The neck was illuminated with 940~nm uniform illumination, and a PPGI system, coded hemodynamic imaging, extracted the jugular venous pulse through a negative correlation filter using the arterial waveform. Data were collected at 0$^\deg$ and 8$^\deg$ head down tilt to alter the CVP due to changes in gravitational forces. Initial results show good agreement between the pulsatility of the jugular venous signal from the PPGI system compared and the pulsatility of the basilic venous pulse measured by a catheter placed into a vein. The PPGI data show changes in baseline pulsatility amplitude that reflect the changes in venous pressure moving from supine to 8$^\deg$ head down tilt transition, and are consistent in magnitude with measured CVP data.
Photoplethysmographic imaging (PPGI) systems are relatively new non-contact biophotonic diffuse reflectance systems able to assess arterial pulsations through transient changes in light-tissue interaction. Many PPGI studies have focused on extracting heart rate from the face or hand. Though PPGI systems can be used for widefield imaging of any anatomical area, whole-body investigations are lacking. Here, using a novel PPGI system, coded hemodynamic imaging (CHI), we explored and analyzed the pulsatility at major arterial locations across the whole body, including the neck (carotid artery), arm/wrist (brachial, radial and ulnar arteries), and leg/feet (popliteal and tibial arteries). CHI was positioned 1.5 m from the participant, and diffuse reactance from a broadband tungsten-halogen illumination was filtered using 850{1000 nm bandpass filter for deep tissue penetration. Images were acquired over a highly varying 24-participant sample (11/13 female/male, age 28.7±12.4 years, BMI 25.5±5.2 kg/m2), and a preliminary case study was performed. B-mode ultrasound images were acquired to validate observations through planar arterial characteristics.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.