SU-E-T-282: Dose Measurements with An End-To-End Audit Phantom for Stereotactic Radiotherapy

2015 ◽  
Vol 42 (6Part16) ◽  
pp. 3398-3398
Author(s):  
R Jones ◽  
R Artschan ◽  
D Thwaites ◽  
J Lehmann
Keyword(s):  
Stereotactic Radiotherapy ◽  
End To End ◽  
Dose Measurements

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.

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

scholarly journals EP-1557: Position and dose ñ end-to-end test audit phantom for stereotactic radiotherapy

2015 ◽  
Vol 115 ◽  
pp. S851
Author(s):  
J. Lehmann ◽  
R. Jones ◽  
R. Artschan ◽  
D. Thwaites
Keyword(s):  
Stereotactic Radiotherapy ◽  
End To End

End-to-end test for fractionated online adaptive MR-guided radiotherapy using a deformable anthropomorphic pelvis phantom

2021 ◽  
Author(s):  
Alina Elter ◽  
Carolin Rippke ◽  
Wibke Johnen ◽  
Philipp Mann ◽  
Emily Hellwich ◽  
...  
Keyword(s):  
Treatment Plan ◽  
Clinical Importance ◽  
Polymer Gel ◽  
Cancer Treatments ◽  
Passing Rates ◽  
End To End ◽  
Pre Treatment ◽  
Prostate Cancer Treatments ◽  
Treatment Procedures ◽  
Dose Measurements

Abstract Objective: In MR-guided radiotherapy (MRgRT) for prostate cancer treatments inter-fractional anatomy changes such as bladder and rectum fillings may be corrected by an online adaption of the treatment plan. To clinically implement such complex treatment procedures, however, specific end-to-end tests are required that are able to validate the overall accuracy of all treatment steps from pre-treatment imaging to dose delivery. Approach: In this study, an end-to-end test of a fractionated and online adapted MRgRT prostate irradiation was performed using the so-called ADAM-PETer phantom. The phantom was adapted to perform 3D polymer gel (PG) dosimetry in the prostate and rectum. Furthermore, thermoluminescence detectors (TLDs) were placed at the center and on the surface of the prostate for additional dose measurements as well as for an external dose renormalization of the PG. For the end-to-end test, a total of five online adapted irradiations were applied in sequence with different bladder and rectum fillings, respectively. Main results: A good agreement of measured and planned dose was found represented by high γ-index passing rates (3 %⁄ 3 mm criterion) of the PG evaluation of 98.9 % in the prostate and 93.7 % in the rectum. TLDs used for PG renormalization at the center of the prostate showed a deviation of -2.3 %. Significance: The presented end-to-end test, which allows for 3D dose verification in the prostate and rectum, demonstrates the feasibility and accuracy of fractionated and online-adapted prostate irradiations in presence of inter-fractional anatomy changes. Such tests are of high clinical importance for the commissioning of new image-guided treatment procedures such as online adaptive MRgRT.

Surgical management of extracranial carotid artery aneurysms

VASA ◽  
2016 ◽  
Vol 45 (3) ◽  
pp. 223-228 ◽  
Author(s):  
Jan Paweł Skóra ◽  
Jacek Kurcz ◽  
Krzysztof Korta ◽  
Przemysław Szyber ◽  
Tadeusz Andrzej Dorobisz ◽  
...  
Keyword(s):  
Carotid Artery ◽  
Surgical Management ◽  
Minor Stroke ◽  
Stroke Rate ◽  
Extracranial Carotid Artery ◽  
Long Term Follow Up ◽  
End To End ◽  
Dacron Patch ◽  
Major Stroke

Abstract. Background: We present the methods and results of the surgical management of extracranial carotid artery aneurysms (ECCA). Postoperative complications including early and late neurological events were analysed. Correlation between reconstruction techniques and morphology of ECCA was assessed in this retrospective study. Patients and methods: In total, 32 reconstructions of ECCA were performed in 31 symptomatic patients with a mean age of 59.2 (range 33 - 84) years. The causes of ECCA were divided among atherosclerosis (n = 25; 78.1 %), previous carotid endarterectomy with Dacron patch (n = 4; 12.5 %), iatrogenic injury (n = 2; 6.3 %) and infection (n = 1; 3.1 %). In 23 cases, intervention consisted of carotid bypass. Aneurysmectomy with end-to-end suture was performed in 4 cases. Aneurysmal resection with patching was done in 2 cases and aneurysmorrhaphy without patching in another 2 cases. In 1 case, ligature of the internal carotid artery (ICA) was required. Results: Technical success defined as the preservation of ICA patency was achieved in 31 cases (96.9 %). There was one perioperative death due to major stroke (3.1 %). Two cases of minor stroke occurred in the 30-day observation period (6.3 %). Three patients had a transient hypoglossal nerve palsy that subsided spontaneously (9.4 %). At a mean long-term follow-up of 68 months, there were no major or minor ipsilateral strokes or surgery-related deaths reported. In all 30 surviving patients (96.9 %), long-term clinical outcomes were free from ipsilateral neurological symptoms. Conclusions: Open surgery is a relatively safe method in the therapy of ECCA. Surgical repair of ECCAs can be associated with an acceptable major stroke rate and moderate minor stroke rate. Complication-free long-term outcomes can be achieved in as many as 96.9 % of patients. Aneurysmectomy with end-to-end anastomosis or bypass surgery can be implemented during open repair of ECCA.

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