End-to-end testing for stereotactic radiotherapy including the development of a Multi-Modality phantom.
Z Med Phys
; 2022 Dec 18.
Article
in En
| MEDLINE
| ID: mdl-36539322
ABSTRACT
PURPOSE:
A new insert for a commercially available end-to-end test phantom was designed and in-house manufactured by 3D printing. Subsequently, the insert was tested for different stereotactic radiation therapy workflows (SRS, SBRT, FSRT, and Multimet) also in comparison to the original insert. MATERIAL ANDMETHODS:
Workflows contained imaging (MR, CT), treatment planning, positioning, and irradiation. Positioning accuracy was evaluated for non-coplanar x-ray, kV- and MV-CBCT systems, as well as surface guided radiation therapy. Dosimetric accuracy of the irradiation was measured with an ionization chamber at four different linear accelerators including dynamic tumor tracking for SBRT.RESULTS:
CT parameters of the insert were within the specification. For MR images, the new insert allowed quantitative analysis of the MR distortion. Positioning accuracy of the phantom with the new insert using the imaging systems of the different linacs was < 1â¯mm/degree also for MV-CBCT and a non-coplanar imaging system which caused > 3â¯mm deviation with the original insert. Deviation of point dose values was <3% for SRS, FSRT, and SBRT for both inserts. For the Multimet plans deviations exceeded 10% because the ionization chamber was not positioned in each metastasis, but in the center of phantom and treatment plan.CONCLUSION:
The in-house manufactured insert performed well in all steps of four stereotactic treatment end-to-end tests. Advantages over the commercially available alternative were seen for quantitative analysis of deformation correction in MR images, applicability for non-coplanar x-ray imaging, and dynamic tumor tracking.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Z Med Phys
Journal subject:
RADIOTERAPIA
Year:
2022
Document type:
Article