Dose Course 2018_Flipping book

2D detectors [EPID]

Calibration for absolute dosimetry

1. Dose Response of the EPID 2. Lateral Scatter within the EPID 3. Scatter from the patient

EPID measurement

Ion chamber measurement

thickness

thickness

SDD fixed

Ic depth of Dmax

Apply a sensitivity matrix correction (get back the image before the flood field correction)

Small ROI near central axis

Chen et al. Med. Phys 33(3), 2006

http://radonc.ucsf.edu/research_group/jpouliot/tutorial/main.htm