Khalid Gameil, Emily Heath and OMPI social

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Thursday, September 25, 2014
3:30-5 pm
Carleton University - Herzberg Building - Room HP4351

1. "Data acquisition for NRC's Ionization Chambers for Radionuclide Standards"
Khalid Gameil - Carleton University/NRC

Abstract: The Radionuclide Lab, at the National Research Council (NRC), uses ionization chambers (IC) to measure the activity of predominantly gamma-emitting isotopes. This study presents data acquired by the combinations of the two ionization chambers (Vinten or TPA) with their respected electrometers (Keithley 6517A or 6517B). This study allows for confirmation on historical data acquired with these chambers as well as give insight to the accuracy of the current process of measuring an isotope's activity. A new data acquisition (DAQ) application was created, called IC_DAQ, to communicate with the electrometers and analyze the data to output the activity in Mega-Becquerels (MBq). In addition, new methods for activity determination were incorporated into the DAQ. The DAQ was validated for multiple isotopes with known activities. Graphs of activities for each combination of isotope, ionization chamber, and electrometer were made to investigate any differences. Dose calibrators are IC's found in every Nuclear Pharmacy and Nuclear Medicine department in every hospital  in Canada. The NRC can use its IC and DAQ system to calibrate and check these dose calibrators as a service. This service has been offered in the past and is currently being relaunched. A trial of this process was done at the NRC's Radionuclide Lab.

2. "Modeling and compensating for effects of respiratory motion in lung radiotherapy"
Emily Heath - Carleton University

Abstract: Tumour motion due to respiration poses a challenge to radiation therapy that, if unaccounted for, can lead to a suboptimal treatment. A variety of planning and delivery methods have been proposed to compensate for respiratory motion during radiation therapy. One approach that is currently under development is 4D radiotherapy, where individual patient respiratory motion parameters are incorporated into the plan optimization. These "4D" plans have been shown to be more conformal than conventional planning approaches, however, the added complexity of the approach means that these plans are highly sensitive to uncertainties in the patient motion model.  This talk will discuss some methods to quantify these motion uncertainties and minimize their impact on the delivered dose.

The talks are followed by a social gathering at Georgetown Pub: 1179A Bank Street (map)
from 5:30pm onward. Hope to see you there.