1. IGRT and Respiratory Gating: Can We See It and Can We Hit It? Joe L. Meadows, M.S. Medical Physicist The Lacks Cancer Center Saint Mary’s Health Care Grand Rapids, MI
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6. OPTICAL TRACKING TECHNOLOGY Over the past 20-30 years our ability to “visualize” what we are treating (beyond skin marks) has dramatically changed! IGRT- Working Definition Prostate US H&N EPID http://biomedcentral.inist kV cone beam CT (CBCT) University of Heidelberg radonc.ucsf.edu Medical Dosimetry, Vol. 32, No. 2, pp. 111-120, 2007 Calypso employs radiofrequency technology comparable to the global positioning system to continuously and precisely monitor biologically inert transponders implanted in the prostate. When prostate displacement exceeds predetermined thresholds, (i.e., 5 mm for more than 10 seconds) treatment can be halted temporarily to readjust the patient's position. Calypso® System Tracking and Target Localization during Radiotherapy for Prostate Cancer https://www.virginiamason.org Odd couple: A prototype device combines a magnetic resonance imager with a linear accelerator. The blue cylinders facing each other are the imaging magnets. The metal circle visible to the left at the back is a magnetic and radiation shield that protects the accelerator’s waveguide. Credit: University of Alberta Cross Cancer Institute Acquire five two-dimensional MRI images per second using Compressive Sensing , acquire only the most important 10 percent of the image data in the first place- FAST!
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8. IGRT- Is It Really Necessary? We are not dealing with a static image!
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