About our lab
We use classical waves for material characterization and imaging, with a focus on ultrasound. We also perform fundamental research in order to better understand wave propagation through complicated materials, which helps to advance imaging and characterization through complex media. Our work involves experiments and/or numerical simulations, and close collaborations with other groups both in New Zealand and overseas.
About the Project
Most classical wave imaging (e.g. medical ultrasound, photoacoustics, optical imaging, and imaging/monitoring of industrial materials) uses sensor arrays (a collection of many sensors which can emit and receive independently) to record a set of signals. The main challenge is how to then use this large dataset in a clever way to gather `hidden' information about the medium, and in particular, how to make accurate images. Usually, an image is calculated based on an assumption that the medium is homogeneous; however, when this hypothesis is incorrect due to layers of muscle, fat, bone, and/or skin, the image can be distorted, resulting in missed or inaccurate medical diagnoses. We develop approaches for better imaging in such complicated environments.
In ultrasound imaging, signals are sent and received by an array of acoustic sensors placed on the skin, while in photoacoustic (PA) imaging, unfocused light illuminates an area of interest, resulting in a thermoelastic expansion of the tissue which creates acoustic waves. These waves are then detected by the acoustic sensor array and used to create an image. Achieving a superior image contrast and resolution can translate to improved outcomes for cancer, microvasculature, inflammatory and cardiac disease screening; however, compensating for the effects of tissue heterogeneity remains a serious challenge for both modalities.
We have a range of possible projects to choose from, based on the interests of the applicant. Areas of research include imaging and sensing in the presence of heterogeneity (e.g. bone) and motion (e.g. blood flow, tissue motion), and the application of these concepts to challenges in materials science and non-destructive evaluation.
The candidate will be part of a small team co-supervised by Dr. Laura Cobus (Senior Lecturer, University of Canterbury) and Dr. Jami Shepherd (Research Associate, University of Auckland). For medical imaging projects, the candidate may visit the University of Auckland (Auckland) periodically to perform PA and/or ultrasound experiments.
Start date: anytime in 2025 (to be arranged with the candidate). Please note that the position may be filled as soon as a suitable candidate is found, so we encourage you to apply promptly.
Supervisors
Supervisor: Laura Cobus
Key qualifications and skills
• A Master’s degree in Physics or (possible) a related branch of Engineering
• Solid coding skills; in particular, expertise in Matlab or Python is a plus
Does the project come with funding
$32,000 NZD per year, plus thesis tuition fees, for three years
Final date for receiving applications
Ongoing
How to Apply
Please feel free to email Laura Cobus with any questions or to discuss possible projects
Keywords
Acoustics; ultrasound; waves; imaging; material science; photoacoustics; physics
