OMPI Seminar: Sara Kashi and Glenn Wells

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Thursday, December 10, 2015

Time: 3:30-5:00 pm. Refreshments start at 3:15 pm.

Location: Centre Foustanellas Auditorium, Second Floor, The University of Ottawa Heart Institute, 40 Ruskin Street.


1. 4D Monte Carlo simulations for verification of delivered dose to a moving anatomy

By Sara Kashi, The Ottawa Hospital Cancer Centre and Carleton

Abstract: One of the main concerns during radiotherapy treatment of lung cancer is the impact of respiratory motion on the dose delivered to the target. Different approaches have been used to estimate the dose delivered to a patient while accounting for such motions. In this talk, I will present a 4D Monte Carlo simulation method that uses measurements of a patient's respiratory motion pattern to calculate the dose delivered to a continuously moving anatomy during static or VMAT beam deliveries. A Monte Carlo model of the Elekta Agility linac has been used for dose calculations with this method. Validation of this method using measurements on a respiratory motion phantom will be presented as well.

2. The pros and cons of pinhole SPECT

By Glenn Wells, The University of Ottawa Heart Institute

Abstract: Single-photon emission computed tomography (SPECT) is an imaging modality that is commonly used in the management of cardiac disease. Standard SPECT cameras use parallel-hole collimators, but recently cardiac SPECT cameras with pinhole collimators (and multiple detectors) have been introduced into the clinic.  Compared to standard cameras, the multi-pinhole design offers advantages in both sensitivity and resolution which allows decreased acquisition times and reduced patient radiation exposure. The multi-pinhole camera design can also be stationary (i.e. non-rotating) which greatly increases temporal resolution and opens the door to dynamic SPECT imaging. However, a complication of the pinhole collimators is that they produce variable resolution, magnification, and sensitivity across the field of view (FOV) of the camera.  The greater complexity of the imaging geometry places a higher demand on the accuracy of the system model used for image reconstruction and methods do not presently exist to measure the camera configuration and
ensure image quality.  In this presentation, I will discuss some of the pros and cons of using pinhole collimator cameras for cardiac SPECT and some of the work we have been doing to investigate and characterize these cameras.

The event will be followed by a social outing:
Where: Pub Italia
When: Dec 10th, 5:30pm onwards
What to do: Please RSVP to me at eortonattoh [dot] on [dot] ca