Treatment systems with integrated imaging capability enabling a highly accurate patient set-up, compensating for any interfraction motion
“ Old Days” IMRT, SBRT,.. “ Now-A Days”
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!
CBCT is based on the same principle as conventional fan beam CT, except that an entire volumetric dataset can be obtained through a single rotation of the source and detector. This is made possible by the use of a 2-D detector, as opposed to the one-dimensional (1-D) detectors used in conventional CT.