PhD project by Kasper Fløng Pedersen

Name: Kasper Fløng Pedersen
Project Title: Microelectronic Circuits for High Density Row-Column CMUT Arrays for 3D Imaging 
Group: Micro Electro-Mechanical Systems and Center for Fast Ultrasound Imaging
Supervisors: Erik Vilain Thomsen and Jørgen Arendt Jensen

Project Description: 
In the recent years, 3D and super-resolution ultrasound imaging (SRI) has been emerging as a non-ionizing and non-invasive technology for localization microscopy and vascular imaging. Aside from the complexity of the scanners and processing power needed to achieve SRI, the major barrier has been scaling conventional fully populated matrix addressed transducer arrays and electronics to the required number of channels and dimensions. For this reason, the emerging technology of row-column addressed (RCA) capacitive micromachined ultrasound transducers (CMUT) arrays have recently attracted some attention for 3D and SRI applications, as they offer high resolution volumetric imaging with a greatly reduced number of connections to the array. 

The aim of this project is to explore and develop new active front-end electronics that exploits the reduced number of interconnections in combination with the increased capacitance of the RCA arrays, to reduce the heat dissipation in the probes, whilst still retaining a signal to noise ratio comparable to other state-of-the-art scanners. The end-goal will be a compact and scalable unit comprised of both front-end electronics and CMUT array, which can be easily incorporated into a small ultrasonic probe.

The following image shows the electronics of the prototype probe, we are currently testing in collaboration with BK Ultrasound:



Front-end electronics for testing 192+192 channel CMUT arrays.

The reduced cost and complexity of the RCA CMUT technology offers the possibility of making volumetric and vascular imaging a routine clinical procedure, with the same availability as conventional ultrasound has today. In many cases, SRI and 3D ultrasound imaging will also be able to replace more expensive and/or ionizing imaging modalities, as well as histopathology studies.



Kasper Fløng Pedersen
PhD student
DTU Health Tech


Erik Vilain Thomsen
Head of Division, Professor
DTU Health Tech
+45 45 25 57 66


Jørgen Arendt Jensen
Head of Section, Professor, Ph.D., Dr.Techn.
DTU Health Tech
+45 45 25 39 24