MSc Thesis: Vision Foundation Models for Medical Imaging

RaySearch develops innovative software solutions to improve cancer care. Over 1200 clinics in more than 54 countries use RaySearch software to improve treatments and quality of life for patients. RaySearch was founded in 2000 and is listed on Nasdaq Stockholm. The headquarters is located in Stockholm, with subsidiaries in the US, Europe, Asia and Australia & New Zealand. Today we are more than 485 employees with a common vision of improving cancer care with innovative software. Our great staff is crucial for our success and we offer a fantastic working environment in modern offices, flexibility and good opportunities for development. We believe in equal opportunities, value diversity and work actively to prevent discrimination. While foundation models have revolutionized natural language, computer vision—and medical imaging in particular—presents a fascinating set of open challenges. In this master thesis, you will train and benchmark vision foundation models to help advance radiotherapy in cancer care. Project Description Foundation models are trained on vast amounts of unlabeled data to learn broad, transferable representations. In this project, you will explore how self-supervised feature learning can be tailored to the complexities of medical imaging. You will train custom model variants on internal data and benchmark them against existing public models. The core focus is evaluating how effectively these unsupervised features transfer to key downstream tasks, such as image segmentation and generation. Your main tasks

• Review relevant research on vision foundation models and self-supervised learning in medical imaging.
• Set up, run, and manage multiple training iterations of custom model variants using internal and public datasets.
• Systematically benchmark the trained models against existing vision foundation models.
• Evaluate feature transferability to downstream tasks, such as image segmentation and generation.

Your profile We are looking for a curious master's student who wants to work where AI meets cancer care. You enjoy combining programming with careful experiments, and you look critically at results instead of taking them at face value. You are independent and well organized, and you can explain your findings clearly to both software engineers and medical physicists.

• Ongoing master's studies in engineering physics, medical physics, computer science, applied mathematics or a related field
• Coursework or project experience in optimization and/or machine learning
• Great programming skills in Python
• Hands-on experience with LLMs
• Fluent written and spoken English

Our Culture Culture at RaySeach is the driving force behind our organization, where everything we do is driven by a shared passion for innovation and the fight against cancer. Our dedication is reflected in our ability to deliver exceptional results, pay close attention to detail, and consistently go the extra mile. Our employees stand out as experts in their field, driven by a relentless focus on solving problems - no matter how complex. At RaySearch, we take pride in leading the way in cancer treatment, leveraging cutting-edge technology to develop innovative solutions that make a real difference in patient care. Our Offer At RaySearch, we offer a diverse and inclusive work environment, fostering openness, sincerity, and collaboration. Located in Hagastaden, Stockholm's Life Science Hub, our modern and creative workspace includes an in-house gym, yoga, and social activities like ping pong, table football, and regular after-work events. Our bistro serves a fantastic lunch buffet, and we offer morning- and afternoon-fika every day. Our rooftop terrace also provides a stunning 360-degree view of Stockholm, enhancing the work experience. Application Please apply to the position through the link below. Selection and interviews will be ongoing. We do not accept applications by e-mail. Application Link.