A revolutionary ultrasound technology developed by researchers at the Institute of Physics for Medicine Paris can now visualize the entire vascular network of major organs (such as the heart, kidney, and liver) in four dimensions (4D). This breakthrough provides unprecedented anatomical and functional information about microcirculation, setting a new standard in the diagnosis of vascular diseases.
Microcirculation (blood flow in arterioles, capillaries, and venules) ensures the delivery of oxygen and nutrients to tissues and the elimination of metabolic waste. Dysfunction of this complex network can lead to severe pathologies, such as heart failure (HF), kidney failure, and chronic liver disease. However, until now, no imaging method existed that simultaneously showed the structure of the microvasculature and the dynamics of blood flow throughout the entire organ.
Technological Breakthrough
This new technique combines 3D Ultrasound Localization Microscopy (ULM) with an innovative multi-lens array probe. This design breaks the resolution limits of standard ultrasound imaging: by monitoring the localization and movement of contrast microbubbles, a spatial resolution of up to 75 micrometers has been achieved—approximately ten times higher than traditional ultrasound. This made it possible to visualize blood vessels with a diameter of less than 100 micrometers in detail over a large volume area and at a high frame rate.
Preclinical Stage
Preclinical studies on pig models have shown the high potential of the technology. Researchers were able to create a kind of map of the entire coronary network of the pig heart. Similarly, in vivo imaging of the kidney fully captured the arterial and venous systems, which was confirmed by X-ray angiography. Liver visualization proved to be more technically challenging, but it was possible to obtain large-volume 3D blood flow maps, which allows for a better assessment of chronic liver diseases.
Beyond static anatomical data, the technology captures the dynamics of blood flow and measures absolute velocities, which are in complete agreement with physiological regularities. It can differentiate arteries and veins based on flow direction and pulsatile characteristics. This provides detailed hemodynamic data at all levels of the microvascular network, significantly exceeding the capabilities of CT-angiography or 4D MRI.
It is noteworthy that this ultrasound method is non-invasive (and does not use ionizing radiation), portable, and cost-effective. It can facilitate early screening and subsequent monitoring of microvascular pathologies, as well as the optimization of interventional procedures and personalized therapeutic strategies.
While the current resolution is still unable to show capillaries with a diameter of less than 10 micrometers, the continuous optimization of technical equipment and software aspects promises significant improvement in the future. Correction of motion artifacts and refined acoustic beamforming techniques together improve the final image quality, preparing this technology for implementation in clinical practice.
Clinical trials are planned to assess the effectiveness and real clinical value of the technology. If successful, this 4D ultrasound imaging system will have a revolutionary impact on the diagnosis of vascular pathologies.
Source: nature communications
