Exploring the Boundary between 3-D Conformal Radiotherapy and Stereotactic Radiosurgery

2015 ◽  
pp. 298-307
Author(s):  
Mark Phillips ◽  
Keith Stelzer ◽  
Eric Dorman
Keyword(s):  
Stereotactic Radiosurgery ◽  
Conformal Radiotherapy

Stereotactic radiotherapy for small and very small tumours (≤1 to ≤3 cc): evaluation of the influence of volumetric-modulated arc therapy in comparison to dynamic conformal arc therapy and 3D conformal radiotherapy as a function of flattened and unflattened beam models

2020 ◽  
pp. 1-7 ◽  
Author(s):  
Gopinath Mamballikalam ◽  
S. Senthilkumar ◽  
R. C. Jaon Bos ◽  
P. M. Ahamed Basith ◽  
P. M. Jayadevan
Keyword(s):  
Stereotactic Radiosurgery ◽  
Small Volume ◽  
Volumetric Modulated Arc Therapy ◽  
Conformal Radiotherapy ◽  
Conformity Index ◽  
Target Coverage ◽  
3D Conformal Radiotherapy ◽  
Dynamic Conformal Arc Therapy ◽  
Arc Therapy ◽  
Delivery Techniques

Abstract Purpose: The objective of this article is to evaluate the dosimetric efficacy of volumetric modulated arc therapy (VMAT) in comparison to dynamic conformal arc therapy (DCAT) and 3D conformal radiotherapy (3DCRT) for very small volume (≤1 cc) and small volume (≤3 cc) tumours for flattened (FF) and unflattened (FFF) 6 MV beams. Materials and methods: A total of 21 patients who were treated with single-fraction stereotactic radiosurgery, using either VMAT, DCAT or 3DCRT, were included in this study. The volume categorisation was seven patients each in <1, 1–2 and 2–3 cc volume. The treatment was planned with 6 MV FF and FFF beams using three different techniques: VMAT/Rapid Arc (RA) (RA_FF and RA_FFF), dynamic conformal arc therapy (DCA_FF and DCA_FFF) and 3DCRT (Static_FF and Static_FFF). Plans were evaluated for target coverage (V100%), conformity index, homogeneity index, dose gradient for 50% dose fall-off, total MU and MU/dose ratio [intensity-modulated radiotherapy (IMRT) factor], normal brain receiving >12 Gy dose, dose to the organ at risk (OAR), beam ON time and dose received by 12 cc of the brain. Result: The average target coverage for all plans, all tumour volumes (TVs) and delivery techniques is 96·4 ± 4·5 (range 95·7 ± 6·1–97·5 ± 2·9%). The conformity index averaged over all volume ranges <1, 2, 3 cc> varies between 0·55 ± 0·08 and 0·68 ± 0·04 with minimum and maximum being exhibited by DCA_FFF for 1 cc and Static_FFF/RA_FFF for 3 cc tumours, respectively. Mean IMRT factor averaged over all volume ranges for RA_FF, DCA_FF and Static_FF are 3·5 ± 0·8, 2·0 ± 0·2 and 2·0 ± 0·2, respectively; 50% dose fall-off gradient varies in the range of 0·33–0·42, 0·35–0·40 and 0·38–0·45 for 1, 2 and 3 cc tumours, respectively. Conclusion: This study establishes the equivalence between the FF and FFF beam models and different delivery techniques for stereotactic radiosurgery in small TVs in the range of ≤1 to ≤3 cc. Dose conformity, heterogeneity, dose fall-off characteristics and OAR doses show no or very little variation. FFF could offer only limited time advantage due to excess dose rate over an FF beam.

scholarly journals Overview of Radiosurgery for Intracranial Meningiomas

2021 ◽  
Author(s):  
Tak Lap Poon ◽  
Ka Wing See
Keyword(s):  
Stereotactic Radiosurgery ◽  
Cranial Nerves ◽  
Conformal Radiotherapy ◽  
Intracranial Tumor ◽  
Tumor Control ◽  
Intracranial Tumors ◽  
Local Pressure ◽  
Eloquent Areas ◽  
Size Number ◽  
Cns Neoplasm

Meningiomas are the second common Central Nervous System (CNS) neoplasm, and are the most common benign intracranial tumor. They approximately constitute up to 30% of all intracranial tumors. They arise from the arachnoidal coverings of brain. Presentation varies and depends on size, number and location of tumors. Symptoms include those related to increased in intracranial pressure, local irritative features including seizure and local pressure effect to eloquent areas, white matter tracts and cranial nerves. Management of meningiomsa is always challenging and multi-disciplinary approaches includes surgery, radiotherapy and possible chemotherapy and immunotherapy. Among radiation therapy treatment, stereotactic radiosurgery (SRS) or stereotactic radiosurgery (SRT) is getting the popularity compared to traditional conformal radiotherapy with comparable tumor control rate.

Medium Term Outcome of LINAC-Based Stereotactic Radiosurgery for Vestibular Schwannomas with Marginal Dose of 12.5 Gy

2012 ◽  
Vol 73 (S 02) ◽  
Author(s):  
J. Ellenbogen ◽  
A. Kinshuck ◽  
M. Jenkinson ◽  
T. Lesser ◽  
D. Husband ◽  
...  
Keyword(s):  
Stereotactic Radiosurgery ◽  
Vestibular Schwannomas ◽  
Medium Term ◽  
Term Outcome

Stereotactic Radiosurgery: The Experience of the Neurotology and Skull Base Unit at Beaumont Hospital

2012 ◽  
Vol 73 (S 02) ◽  
Author(s):  
M. Khan ◽  
M. Sadadcharam ◽  
R. Wormald ◽  
M. Javadpour ◽  
D. Rawluk ◽  
...  
Keyword(s):  
Skull Base ◽  
Stereotactic Radiosurgery ◽  
Beaumont Hospital ◽  
Base Unit

Long-Term Quality of Life Following Stereotactic Radiosurgery for Vestibular Schwannoma

2012 ◽  
Vol 73 (S 02) ◽  
Author(s):  
J. Thom ◽  
M. Carlson ◽  
J. Jacob ◽  
C. Driscoll ◽  
B. Neff ◽  
...  
Keyword(s):  
Quality Of Life ◽  
Stereotactic Radiosurgery ◽  
Vestibular Schwannoma
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