A helical tomotherapy dynamic quality assurance.
A multifaceted tomotherapy quality assurance procedure has been developed. This procedure tests most of the features inherent in the tomotherapy Hi-Art device. This includes the megavoltage imaging quality, spatial and temporal accuracy of the dynamic delivery properties, as well as more traditional beam output characteristics. This is accomplished with a specialized multichannel electrometer that measures collected charge every 100 ms and a Virtual Water cylindrical phantom that holds many ion chambers and differing density insert plugs. Both devices are offered with the Hi-Art product. These tests are presented as well as their sensitivity to beam and delivery variations.
Balog
John
J
Mohawk Valley Medical Physics, Rome, New York 13440, USA.
Holmes
Tim
T
Vaden
Richard
R
D006801:Humans; D007834:Lasers; D019047:Phantoms, Imaging; D011786:Quality Control; D011874:Radiometry / Q000379:methods; D011880:Radiotherapy Planning, Computer-Assisted / Q000379:methods*; D050397:Radiotherapy, Intensity-Modulated / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012984:Software; D013997:Time Factors; D036542:Tomography, Spiral Computed / Q000379:methods*