Physics Department Seminar
Dr. Aaron Fenster
Professor, Robarts Scientist
University of Western Ontario
Tuesday, October 17, 2017

3D Ultrasound-Guided Interventions


The last three decades have witnessed unprecedented developments of new imaging systems making use of 3D visualization.  These new technologies have revolutionized diagnostic radiology, as they provide the clinician with information about the interior of the human body never before available. Ultrasound imaging is an important cost-effective technique used routinely in the management of a number of diseases.  However, guiding interventions using conventional 2D ultrasound limits our ability to visualize the anatomy, the target of the intervention and sensitive structures that must be avoided, because multiple 2D images must be integrated mentally.  This practice is inefficient, and may to variability and incorrect treatment.  Also, since the 2D ultrasound image represents a thin plane at an arbitrary angle in the body, reproduction of this plane at a later time is difficult for monitoring of any possible recurrence.

Over the past 2 decades, investigators have addressed these limitations by developing 3D ultrasound techniques. We will describe developments of 3D ultrasound imaging instrumentation and techniques for use in image-guided interventions.  As ultrasound imaging is an interactive imaging modality, providing the physician with real-time visualization of anatomy and function, the development of image analysis and guidance tools is challenging.  Typically, these tools require segmentation, classification, tracking and visualization of pathology and instruments to be executed in real-time, accurately, reproducibly and robustly.  As an illustration of these needs, we will present some image-guided intervention applications that would benefit from these developments. Specific examples cover prostate biopsy and therapy, gynaecologic and breast brachytherapy and liver tumour focal ablation.