Abstract
The purpose of this study was to test the feasibility of a patient specific phantom for patient specific dosimetric verification. Using the head and neck region of an anthropomorphic phantom as a substitute for an actual patient, a soft-tissue equivalent model was constructed with the use of a 3D printer. Calculated and measured dose in the anthropomorphic phantom and the 3D printed phantom was compared for a parallel-opposed head and neck field geometry to establish tissue equivalence. A nine-field IMRT plan was constructed and dose verification measurements were performed for the 3D printed phantom as well as traditional standard phantoms. The maximum difference in calculated dose was 1.8% for the parallel-opposed configuration. Passing rates of various dosimetric parameters were compared for the IMRT plan measurements; the 3D printed phantom results showed greater disagreement at superficial depths than other methods. A custom phantom was created using a 3D printer. It was determined that the use of patient specific phantoms to perform dosimetric verification and estimate the dose in the patient is feasible. In addition, end-to-end testing on a per-patient basis was possible with the 3D printed phantom. Further refinement of the phantom construction process is needed for routine use.
Original language | English (US) |
---|---|
Article number | 5763 |
Pages (from-to) | 5763-5773 |
Number of pages | 11 |
Journal | Physics in Medicine and Biology |
Volume | 59 |
Issue number | 19 |
DOIs | |
State | Published - Oct 7 2014 |
Bibliographical note
Publisher Copyright:© 2014 Institute of Physics and Engineering in Medicine.
Keywords
- 3D printing
- IGRT QA
- IMRT QA
- dose verification
- end-to-end testing