Economical, 2D Array Alternative Perform absolute and relative dosimetry using ion chambers or film, no software or expensive detector equipment is required. Easy rotational QA for evaluation of dose distribution. Machine QA Facilitates commissioning and TPS evaluation. Assess reconstruction abilities of the TPS and determine cumulative uncertainties. Evaluate the ability of the TPS to account for critical structures. Patient QA Obtain absolute dose, relative dose and point dose dosimetry QA measurements at isocenter and off-axis.