Back to Search
Start Over
A method to predict patient-specific table coordinates for quality assurance in external beam radiation therapy
- Source :
- Journal of Applied Clinical Medical Physics
- Publication Year :
- 2018
- Publisher :
- Wiley, 2018.
-
Abstract
- Purpose While external beam radiotherapy treatment planning determines nearly every mechanical and dosimetric parameter of the linear accelerator (LINAC), the table coordinates in all three dimensions are generally unknown until initial patient setup at the LINAC. Knowing these parameters in advance could help verify the direction of patient shifts and prevent wrong‐site errors. This study aims to determine the feasibility and accuracy of table coordinate prediction for indexed immobilization devices. Methods A total of 303 table coordinates were predicted for patients on Varian and Elekta linear accelerators with immobilization devices including Orfit mask with baseplate, wingboard, breastboard and BodyFix. Predictions were made for all three spatial dimensions except for Body Fix setups due to the lack of a radiographically apparent indexing‐related landmark. Coordinates were predicted by measuring baseline table coordinates in all dimensions at specified landmark positions. Results Predictions were accurate within 2 cm for 86% of coordinates (71% within 1 cm). Table coordinates were predicted most accurately for head and neck patients with a base plate and the most difficult prediction was in the lateral direction for breastboard patients. Conclusions With proper indexing, table coordinates can be predicted with reasonable accuracy. The data suggest an action of level of 2 cm with certain exceptions for specific immobilization devices and directions.
- Subjects :
- Computer science
medicine.medical_treatment
Base (geometry)
quality assurance
87.55.n
external beam radiotherapy
Linear particle accelerator
030218 nuclear medicine & medical imaging
03 medical and health sciences
0302 clinical medicine
patient safety
medicine
Radiation Oncology Physics
Humans
Radiology, Nuclear Medicine and imaging
External beam radiotherapy
Radiometry
Radiation treatment planning
Instrumentation
Radiation
Landmark
business.industry
Radiotherapy Planning, Computer-Assisted
Action (physics)
030220 oncology & carcinogenesis
Calibration
Table (database)
Particle Accelerators
business
Quality assurance
Algorithm
Subjects
Details
- ISSN :
- 15269914
- Volume :
- 19
- Database :
- OpenAIRE
- Journal :
- Journal of Applied Clinical Medical Physics
- Accession number :
- edsair.doi.dedup.....60c2c60e736c8e3ad8a9ddd34fa22504