[CMU VASC Seminar]Real Time 3D Surface Imaging and Tracking for Radiation Therapy

VASC Seminar Series

Speaker: Maud Poissonnier, Vision RT

Time: Thursday, 11/9

Title: Real Time 3D Surface Imaging and Tracking for Radiation Therapy

Abstract:

Radiation Therapy involves the precise delivery of high energy X-rays to
tumour tissue in order to treat cancer. The current challenge is to ensure
that the radiation is delivered to the correct target location, thus
reducing the volume of normal tissue irradiated and potentially enabling
the escalation of dose. This may be achieved through the exploitation of a
combination of imaging technologies.

Vision RT has developed a 3D surface imaging technology which can image
the entire 3D surface of a patient quickly and accurately. This relies on
close range stereo photogrammetric techniques using pairs of stereo
cameras. Registration algorithms are employed to match surface data
acquired from the same patient in different positions. High speed tracking
techniques have also been developed to allow tracking of regions at speeds
of approximately 20 fps.

AlignRT(r) is Vision RT's patient setup and surveillance system which is
now in use at a variety of clinics. The system acquires 3D surface data
during simulation or imports reference contours from diagnostic Computed
Tomography (CT). It then images the patient prior to treatment and
computes any 3D movement required to correct the patient's position. The
system is also able to monitor any patient movement during treatment. We
will finish by presenting work-in-progress systems which allow real time
tracking of breathing motion to facilitate 4D CT reconstruction and
respiratory gated radiotherapy.

Bio:

Dr. Maud Poissonnier was educated in France until she decided to
explore Great Britain in 1995. She first graduated at Heriot-Watt
University in Edinburgh with an MSc in Reservoir Evaluation and Management
(Petroleum Engineering). She then joined the Medical Vision Lab (Robotics
Research Group) at the University of Oxford. She obtained her EPSRC-funded
DPhil in 2003 under the supervision of Sir Prof. Mike Brady in the area of
x-ray mammography image processing using physics-based modelling. After a
post-doctoral research on a multimodality, Grid enabled platform for
tele-mammography, she moved very slightly East (to London) and joined
Vision RT Ltd in April 2005 where she is presently Senior Software
Engineer.