Six Talks at AAPM 2014 – The Latest in Imaging Physics

The I-STAR Lab presented 6 talks at the annual meeting of the American Association of Physicists in Medicine (AAPM) in Austin TX, July 20 – 25, 2014, featuring the latest in imaging physics, analysis, reconstruction, and Monte Carlo simulation.

– Wojciech Zbijewski presented an overview and update in an educational symposium on Monte Carlo simulation, including variance reduction and kernel smoothing acceleration methods. His work shows such methods to provide accurate MC simulation on timescales consistent with real applications in diagnostic imaging and image-guided procedures.

— Alejandro Sisniega presented a framework for high-quality cone-beam CT of traumatic brain injury (TBI) including high-fidelity artifact correction. Using GPU-accelerated Monte Carlo scatter correction combined with parametric models of beam-hardening, lag, and veiling glare, his work demonstrates major improvement in CBCT image quality consistent with the challenging tasks of TBI imaging.

— Qian Cao presented a model for 3D image analysis in cone-beam CT of the joints. Using an electrostatic model that envisions the joint as a capacitor, his work overcomes conventional limitations of simple joint space measures and demonstrated significant improvement in the ability to detect osteoarthritis associated with subtle changes in joint space morphology.

— Adam Wang presented a new method for high-speed statistical image reconstruction using accelerated convergence methods based on Nesterov’s method. Without loss in image quality, Adam’s work shows that methods conventionally requiring an hour or more to reconstruct can be performed in 2 minutes, bringing advanced iterative reconstruction methods to a practical timescale for image-guided surgery.

— Web Stayman presented the latest advances in 3D image reconstruction in an invited symposium, including how specification of the imaging task can be rigorously incorporated in the image acquisition and reconstruction process. His work shows how advanced imaging platforms such as a robotic C-arm can be used to carry out noncircular orbits that are optimal in image quality and dose for image-guided procedures.

— Jeff Siewerdsen presented a plenary in the President’s Symposium entitled “Innovation in the Medical Physics Enterprise.” He addressed the central role that medical physicists play in advancing the state of care through identification of pertinent clinical needs, development of innovative solutions, and translation to clinical care. Particularly in a changing, cost-sensitive landscape, the role of medical physicists in multi-disciplinary research research and innovation is greater than ever.