SU-F-T-311: Comparison of Measurements From Two Diode Array QA Devices to Deep Point Dose Measurements with Two Treatment Planning Model Settings for Brain VMAT SRT Patient-Specific QA

2016 ◽  
Vol 43 (6Part17) ◽  
pp. 3534-3534
Author(s):  
B Weethee ◽  
J Cheung ◽  
A Perez-Andujar ◽  
A Sudhyadhom ◽  
J Chen
Keyword(s):  
Treatment Planning ◽  
Patient Specific ◽  
Diode Array ◽  
Planning Model ◽  
Deep Point ◽  
Patient Specific Qa ◽  
Dose Measurements

SU-C-BRD-04: Comparison of Shallow Fluence to Deep Point Dose Measurements for Spine VMAT SBRT Patient-Specific QA

2015 ◽  
Vol 42 (6Part2) ◽  
pp. 3192-3192
Author(s):  
J Cheung ◽  
M Held ◽  
O Morin ◽  
B Weethee ◽  
C Chuang ◽  
...  
Keyword(s):  
Patient Specific ◽  
Deep Point ◽  
Patient Specific Qa ◽  
Dose Measurements

SU-F-T-270: A Technique for Modeling a Diode Array Into the TPS for Lung SBRT Patient Specific QA

2016 ◽  
Vol 43 (6Part17) ◽  
pp. 3524-3525
Author(s):  
C Curley ◽  
Z Ouhib ◽  
T Leventouri
Keyword(s):  
Patient Specific ◽  
Diode Array ◽  
Lung Sbrt ◽  
Patient Specific Qa

Evaluating small field dosimetry with the Acuros XB (AXB) and analytical anisotropic algorithm (AAA) dose calculation algorithms in the eclipse treatment planning system

2019 ◽  
Vol 18 (4) ◽  
pp. 353-364
Author(s):  
Sepideh Behinaein ◽  
Ernest Osei ◽  
Johnson Darko ◽  
Paule Charland ◽  
Dylan Bassi
Keyword(s):  
Treatment Planning ◽  
Planning System ◽  
Treatment Planning System ◽  
Patient Specific ◽  
Average Dose ◽  
Water Phantom ◽  
Acuros Xb ◽  
Small Fields ◽  
Dose Measurements ◽  
The Brain

AbstractBackground:An increasing number of external beam treatment modalities including intensity modulated radiation therapy, volumetric modulated arc therapy (VMAT) and stereotactic radiosurgery uses very small fields for treatment planning and delivery. However, there are major challenges in small photon field dosimetry, due to the partial occlusion of the direct photon beam source’s view from the measurement point, lack of lateral charged particle equilibrium, steep dose-rate gradient and volume averaging effect of the detector response and variation of the energy fluence in the lateral direction of the beam. Therefore, experimental measurements of dosimetric parameters such as percent depth doses (PDDs), beam profiles and relative output factors (ROFs) for small fields continue to be a challenge.Materials and Methods:In this study, we used a homogeneous water phantom and the heterogeneous anthropomorphic stereotactic end-to-end verification (STEEV) head phantom for all dose measurements and calculations. PDDs, lateral dose profiles and ROFs were calculated in the Eclipse Treatment Planning System version 13·6 using the Acuros XB (AXB) and the analytical anisotropic algorithms (AAAs) in a homogenous water phantom. Monte Carlo (MC) simulations and measurements using the Exradin W1 Scintillator were also accomplished for four photon energies: 6 MV, 6FFF, 10 MV and 10FFF. Two VMAT treatment plans were generated for two different targets: one located in the brain and the other in the neck (close to the trachea) in the head phantom (CIRS, Norfolk, VA, USA). A Varian Truebeam linear accelerator (Varian, Palo Alto, CA, USA) was used for all treatment deliveries. Calculated results with AXB and AAA were compared with MC simulations and measurements.Results:The average difference of PDDs between W1 Exradin Scintillator measurements and MC simulations, AAA and AXB algorithm calculations were 1·2, 2·4 and 3·2%, respectively, for all field sizes and energies. AXB and AAA showed differences in ROF of about 0·3 and 2·9%, respectively, compared with W1 Exradin Scintillator measured values. For the target located in the brain in the head phantom, the average dose difference between W1 Exradin Scintillator and the MC simulations, AAA and AXB were 0·2, 3·2 and 2·7%, respectively, for all field sizes. Similarly, for the target located in the neck, the respective dose differences were 3·8, 5·7 and 3·5%.Conclusion:In this study, we compared dosimetric parameters such as PDD, beam profile and ROFs in water phantom and isocenter point dose measurements in an anthropomorphic head phantom representing a patient. We observed that measurements using the W1 Exradin scintillator agreed well with MC simulations and can be used efficiently for dosimetric parameters such as PDDs and dose profiles and patient-specific quality assurance measurements for small fields. In both homogenous and heterogeneous media, the AXB algorithm dose prediction agrees well with MC and measurements and was found to be superior to the AAA algorithm.

Dosimetric characteristics of a 2D silicon diode array for stereotactic radiotherapy end-to-end patient-specific QA

2020 ◽  
Vol 173 ◽  
pp. 108885
Author(s):  
Long Bai ◽  
Qing Xiao ◽  
Qiang Wang ◽  
Jianling Zhao ◽  
Guangjun Li ◽  
...  
Keyword(s):  
Stereotactic Radiotherapy ◽  
Patient Specific ◽  
Diode Array ◽  
Silicon Diode ◽  
Patient Specific Qa ◽  
End To End

WE-G-BRB-09: CyberKnife Patient Specific QA Using a 4D Cylindrical Diode Array System

2012 ◽  
Vol 39 (6Part28) ◽  
pp. 3968-3968
Author(s):  
S Koren ◽  
I Veltchev ◽  
J Fan ◽  
M Lin ◽  
A Guemnie Tafo ◽  
...  
Keyword(s):  
Patient Specific ◽  
Diode Array ◽  
Patient Specific Qa
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