Statistical process control and verifying positional accuracy of a cobra motion couch using step-wedge quality assurance tool.

ABSTRACT: This study utilizes process control techniques to identify action limits for TomoTherapy couch positioning quality assurance tests. A test was introduced to monitor accuracy of the applied couch offset detection in the TomoTherapy Hi-Art treatment system using the TQA "Step-Wedge Helical" module and MVCT detector. Individual X-charts, process capability (cp), probability (P), and acceptability (cpk) indices were used to monitor a 4-year couch IEC offset data to detect systematic and random errors in the couch positional accuracy for different action levels. Process capability tests were also performed on the retrospective data to define tolerances based on user-specified levels. A second study was carried out whereby physical couch offsets were applied using the TQA module and the MVCT det

SUBMITTER: Binny D 

PROVIDER: S-EPMC5874965 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature