Internship
High frame rate Doppler imaging: simulation, acquisition and post-processing
Context
Ultrasound is a wide used imaging modality thanks to its non-invasive behaviour and safe use. Recently, the number of image that can be acquired has gone from 30 images/second to 20000 images/seconds thanks to plane wave imaging (PWI). This huge number of acquired data makes possible motion estimation at a very high rate to estimate extremely quick motion.
In clinical context, the blood flow speed estimation is conducted using Doppler imaging. However, classical Doppler has a limited spatial range because a high repetition transmission is required to estimate the frequency shift. With the apparition of PWI, in the same time that the image of the medium, the Doppler estimation can be performed on the whole acquired image and allow complex flow jet estimation.
Objectives of the internship
The objective of this internship is to develop a complete high frame rate Doppler toolbox that can be used in clinical context. Various techniques as colour Doppler, power Doppler, vector Doppler… have to be developed. For each technique, a simulation framework will first be proposed in order to test and to validate the required processing. Once conducted, different acquisitions will be performed on the research scanner of the team and in vito / in vivo situation to validate the development. The final objective of the internship is to develop, validate and to broadcast in the team a complete library of the various Doppler technique that may be useful in future developments.
Required competences
- Programming skill (Matlab, C++)
- Mathematical modelling
- Image and signal processing
- Physics knowledge will be a plus
- Autonomy
Contact
To apply, send a CV, a cover letter and the marks of the previous years to:
François Varray: francois.varray@creatis.insa-lyon.fr
Period
6 months internship starting September 2015
Required level: M2 (M1 can be considered depending on previous expertise)
Bibliography
Bercoff et al., Ultrafast compound doppler imaging: providing full blood flow characterization, IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2011.
Dort et al., Vector flow mapping using plane wave ultrasound imaging, IEEE International Ultrasonics Symposium, 2012.