TY - JOUR
T1 - Collision prediction for intracranial stereotactic radiosurgery planning
T2 - An easy-to-implement analytical solution
AU - Felefly, T.
AU - Achkar, S.
AU - Khater, N.
AU - Sayah, R.
AU - Fares, G.
AU - Farah, N.
AU - El Barouky, J.
AU - Azoury, F.
AU - El Khoury, C.
AU - Roukoz, C.
AU - Nehme Nasr, D.
AU - Nasr, E.
N1 - Publisher Copyright:
© 2020 Société française de radiothérapie oncologique (SFRO)
PY - 2020/7/1
Y1 - 2020/7/1
N2 - Purpose: Gantry collision is a concern in linac-based stereotactic radiosurgery (SRS). Without collision screening, the planner may compromise optimal planning, unnecessary re-planning delays can occur, and incomplete treatments may be delivered. To address these concerns, we developed a software for collision prediction based on simple machine measurements. Materials and methods: Three types of collision were identified; gantry-couch mount, gantry-couch and gantry-patient. Trigonometric formulas to calculate the distance from each potential point of collision to the gantry rotation axis were generated. For each point, collision occurs when that distance is greater than the gantry head to gantry rotational axis distance. The colliding arc for each point is calculated. A computer code incorporating these formulas was generated. The inputs required are the couch coordinates relative to the isocenter, the patient dimensions, and the presence or absence of a circular SRS collimator. The software outputs the collision-free gantry angles, and for each point, the shortest distance to the gantry or the colliding sector when collision is identified. The software was tested for accuracy on a TrueBEAM® machine equipped with BrainLab® accessories for 80 virtual isocenter-couch angle configurations with and without a circular collimator and a parallelepiped phantom. Results: The software predicted the absence of collision for 19 configurations. The mean absolute error between the measured and predicted gantry angle of collision for the remaining 61 cases was 0.86 (0.01–2.49). Conclusion: This tool accurately predicted collisions for linac-based intracranial SRS and is easy to implement in any radiotherapy facility.
AB - Purpose: Gantry collision is a concern in linac-based stereotactic radiosurgery (SRS). Without collision screening, the planner may compromise optimal planning, unnecessary re-planning delays can occur, and incomplete treatments may be delivered. To address these concerns, we developed a software for collision prediction based on simple machine measurements. Materials and methods: Three types of collision were identified; gantry-couch mount, gantry-couch and gantry-patient. Trigonometric formulas to calculate the distance from each potential point of collision to the gantry rotation axis were generated. For each point, collision occurs when that distance is greater than the gantry head to gantry rotational axis distance. The colliding arc for each point is calculated. A computer code incorporating these formulas was generated. The inputs required are the couch coordinates relative to the isocenter, the patient dimensions, and the presence or absence of a circular SRS collimator. The software outputs the collision-free gantry angles, and for each point, the shortest distance to the gantry or the colliding sector when collision is identified. The software was tested for accuracy on a TrueBEAM® machine equipped with BrainLab® accessories for 80 virtual isocenter-couch angle configurations with and without a circular collimator and a parallelepiped phantom. Results: The software predicted the absence of collision for 19 configurations. The mean absolute error between the measured and predicted gantry angle of collision for the remaining 61 cases was 0.86 (0.01–2.49). Conclusion: This tool accurately predicted collisions for linac-based intracranial SRS and is easy to implement in any radiotherapy facility.
KW - Collision
KW - Intracranial
KW - Planning
KW - Radiosurgery
UR - http://www.scopus.com/inward/record.url?scp=85085278561&partnerID=8YFLogxK
U2 - 10.1016/j.canrad.2020.01.003
DO - 10.1016/j.canrad.2020.01.003
M3 - Article
C2 - 32467083
AN - SCOPUS:85085278561
SN - 1278-3218
VL - 24
SP - 316
EP - 322
JO - Cancer/Radiotherapie
JF - Cancer/Radiotherapie
IS - 4
ER -