Pablo Irarrázaval

Pablo Villacorta-Aylagas, Manuel Rodríguez-Cayetano, Carlos Castillo-Passi et al.

We present MRSeqStudio, a new all-in-one web-based tool for MRI sequence development and simulation, with the physics-based simulator KomaMRI running at the back-end and our own sequence designer at the front-end. It combines accessibility, interactivity and technical flexibility, within an environment suitable for both education and research. Our tool provides MR sequence design and simulation as a service, with no local installation needed by the user; alternatively, the code is publicly available on GitHub, for users who wish to deploy the application on their own server.

Javier Bisbal, Julio Sotelo, Maria I Valdés et al.

Deep reinforcement learning (DRL) algorithms have shown robust results in plane reformatting tasks. In these methods, an agent sequentially adjusts the position and orientation of an initial plane towards an objective location. This process allows accurate plane reformatting, without the need for detailed landmarks, which makes it suitable for images with limited contrast and resolution, such as 4D flow MRI. However, current DRL methods require the test dataset to be in the same position and orientation as the training dataset. In this paper, we present a novel technique that utilizes a flexible coordinate system based on the current state, enabling navigation in volumes at any position or orientation. We adopted the Asynchronous Advantage Actor Critic (A3C) algorithm for reinforcement learning, outperforming Deep Q Network (DQN). Experimental results in 4D flow MRI demonstrate improved accuracy in plane reformatting angular and distance errors (6.32 +- 4.15 ° and 3.40 +- 2.75 mm), as well as statistically equivalent flow measurements determined by a plane reformatting process done by an expert (p=0.21). The method's flexibility and adaptability make it a promising candidate for other medical imaging applications beyond 4D flow MRI.