scholarly journals The use of collimator angle optimization and jaw tracking for VMAT‐based single‐isocenter multiple‐target stereotactic radiosurgery for up to six targets in the Varian Eclipse treatment planning system

2021 ◽  
Author(s):  
Lauren M. M. Pudsey ◽  
Dean Cutajar ◽  
Alex Wallace ◽  
Anastasia Saba ◽  
Laurel Schmidt ◽  
...  
Keyword(s):  
Stereotactic Radiosurgery ◽  
Treatment Planning ◽  
Planning System ◽  
Treatment Planning System ◽  
Multiple Target ◽  
Collimator Angle ◽  
Single Isocenter

scholarly journals Systematic end-to-end testing of multiple target treatments using the modular RUBY phantom

2021 ◽  
Author(s):  
Leonie Brodbek ◽  
Jana Kretschmer ◽  
Katrin Büsing ◽  
Hui Khee Looe ◽  
Bjoern Poppe ◽  
...  
Keyword(s):  
Treatment Planning ◽  
Monte Carlo Algorithm ◽  
Planning System ◽  
Treatment Planning System ◽  
Detector Response ◽  
Multiple Target ◽  
Collapsed Cone ◽  
End To End ◽  
Dose Measurements ◽  
Single Isocenter

Abstract The RUBY head phantom in combination with the System QA insert MultiMet can be used for simultaneous point dose measurements at an isocentric and two off-axis positions. This study investigates the suitability of the system for systematic integral end-to-end testing of single-isocenter multiple target stereotactic treatments. Several volumetric modulated arc therapy plans were optimized on a planning CT of the phantom positioned in a stereotactic mask on the stereotactic treatment board. The plans were created for three artificial spherical target volumes centred around the measurement positions in the MultiMet insert. Target diameters between 5 and 40 mm were investigated. Coplanar and non-coplanar plans were optimized using the collapsed cone algorithm of the Oncentra Masterplan treatment planning system and recalculated with the Monte Carlo algorithm of the Monaco treatment planning system. Measurements were performed at an Elekta Synergy linear accelerator. The head phantom was positioned according to clinical workflow comprising immobilization and CBCT imaging. Simultaneous point dose measurements at all target positions were performed with three PinPoint 3D chambers (type 31022) as well as three microDiamond (type 60019) detectors and compared to the treatment planning system calculations. Furthermore, the angular dependence of the detector response was investigated to estimate the associated impact on the measured point dose values. Considering all investigated plans, PTV diameters and positions, the point doses calculated with the Monaco treatment planning system and the microDiamond measurements differed within 3.5%, whereas the PinPoint 3D showed differences of up to 6.9%. Point dose differences determined in comparison to the Oncentra Masterplan dose calculations were larger. The RUBY system was shown to be suitable for end-to-end testing of complex treatment scenarios such as single-isocenter multiple target plans.

Treatment planning system and beam data validation for the ZAP‐X: a novel self‐shielded stereotactic radiosurgery system

2021 ◽  
Author(s):  
Shiv P. Srivastava ◽  
Shyam S. Jani ◽  
Dilini S. Pinnaduwage ◽  
Xiangsheng Yan ◽  
Leland Rogers ◽  
...  
Keyword(s):  
Stereotactic Radiosurgery ◽  
Treatment Planning ◽  
Planning System ◽  
Treatment Planning System ◽  
Data Validation

Linac-stereotactic radiosurgery (LSRS) in the management of trigeminal neuralgia

2006 ◽  
Vol 24 (18_suppl) ◽  
pp. 18603-18603
Author(s):  
S. Gurley ◽  
R. Mark ◽  
P. J. Anderson ◽  
T. Neumann ◽  
M. Nair
Keyword(s):  
Trigeminal Neuralgia ◽  
Stereotactic Radiosurgery ◽  
Treatment Planning ◽  
Gamma Knife ◽  
Root Zone ◽  
Planning System ◽  
Response To Treatment ◽  
Treatment Planning System ◽  
Facial Numbness ◽  
Mri Scans

18603 Background: Stereotactic Radiosurgery (SRS) with the Gamma Knife (GK) has been used successfully in the treatment of Trigeminal Neuralgia (TN). Results have been comparable to open surgery. There have been few reports with the use of LSRS in the management of TN. We report our updated results with LSRS in the treatment of TN. Methods: Between 2000 and 2006, 37 patients with medically refractory TN were treated with LSRS. Prior neurosurgical intervention had been performed in 28 patients. Ten patients had one procedure, 10 patients two, and 3 patients three interventions. All patients had typical TN. LSRS was given to the cranial nerve V entry root zone into the brainstem. Targeting was defined by CT and MRI Scans, and CT Cisternogram, utilizing axial, coronal, and sagittal images. Treatment planning was accomplished thru the Radionics Treatment Planning System. The dose was 87 Gy to Dm, in one fraction using the 5 mm collimator and 6 arcs with the 20% Isodose line just touching the brainstem. This dosimetry is similar to Gamma Knife. The dose rate was 400 MU/min. Average Arc length was 130 degrees. Response to treatment was defined as excellent (no pain, off analgesics), good (no pain, with analgesics), and poor (continued pain despite analgesics). Results: With a median follow-up of 40 months (range 6–72 months), 73% (27/37) of patients have reported an excellent or good result after LSRS. One patient has sustained permanent ipsilateral facial numbness. Conclusions: LSRS offers comparable results to Gamma Knife SRS, with respect to both pain relief and complications, in the management of TN. No significant financial relationships to disclose.

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