scholarly journals Technical note: The effect of the 4-mm-collimator output factor on gamma knife dose distributions

2003 ◽  
Vol 4 (4) ◽  
pp. 386-389
Author(s):  
John P. Gibbons ◽  
Dimitris Mihailidis ◽  
Curtis Worthington ◽  
Hassaan Alkhatib ◽  
Raleigh Boulware ◽  
...  
Keyword(s):  
Gamma Knife ◽  
Technical Note ◽  
Dose Distributions ◽  
Output Factor

High Resolution Measurement of Dose Distributions in the LEKSELL Gamma Knife

1994 ◽  
Vol 4 (4) ◽  
pp. 215-219
Author(s):  
P. Kindl ◽  
B. Obenaus ◽  
Kh. Feichtinger ◽  
G. Stuecklschweiger
Keyword(s):  
High Resolution ◽  
Gamma Knife ◽  
Dose Distributions ◽  
High Resolution Measurement ◽  
Resolution Measurement

Stereotactic Device for Gamma Knife Radiosurgery in Experimental Animals: Technical Note

2006 ◽  
Vol 84 (2-3) ◽  
pp. 97-102 ◽  
Author(s):  
Yong-Seok Im ◽  
Do-Hyun Nam ◽  
Jong-Soo Kim ◽  
Sang-Gyu Ju ◽  
Do-Hoon Lim ◽  
...  
Keyword(s):  
Gamma Knife ◽  
Gamma Knife Radiosurgery ◽  
Technical Note ◽  
Experimental Animals ◽  
Stereotactic Device

SU-E-J-240: The Impact On Clinical Dose-Distributions When Using MR-Images Registered with Stereotactic CT-Images in Gamma Knife Radiosurgery

2014 ◽  
Vol 41 (6Part10) ◽  
pp. 213-213
Author(s):  
H Benmakhlouf ◽  
T Wangerid ◽  
T Kraepelien ◽  
P Forander
Keyword(s):  
Gamma Knife ◽  
Gamma Knife Radiosurgery ◽  
Ct Images ◽  
Mr Images ◽  
Dose Distributions ◽  
Clinical Dose ◽  
The Impact

A Stereotactic Device for Experimental Rat and Mouse Irradiation Using Gamma Knife Model B - Technical Note

2001 ◽  
Vol 143 (1) ◽  
pp. 83-88 ◽  
Author(s):  
T. Kamiryo ◽  
K. Han ◽  
J. Golfinos ◽  
P. Kim Nelson
Keyword(s):  
Gamma Knife ◽  
Technical Note ◽  
Mouse Irradiation ◽  
Stereotactic Device

Lateral Positioning Technique for the Treatment of Far-lateral Targets with the Leksell Gamma Knife: Technical Note

Neurosurgery ◽  
2002 ◽  
Vol 51 (6) ◽  
pp. 1512-1519 ◽  
Author(s):  
Nicolas Massager ◽  
Jean R??gis ◽  
Denis Porcheron ◽  
Daniel Devriendt ◽  
Fran??oise Desmedt ◽  
...  
Keyword(s):  
Gamma Knife ◽  
Technical Note ◽  
Far Lateral ◽  
Positioning Technique ◽  
Lateral Positioning

scholarly journals Uncertainties in the measurement of relative doses in radiotherapy

2021 ◽  
Vol 27 (1) ◽  
pp. 1-9
Author(s):  
Krzysztof Buliński ◽  
Tomasz Kuszewski ◽  
Katarzyna Wnuk ◽  
Janusz Braziewicz ◽  
Krzysztof Ślosarek
Keyword(s):  
Measurement Uncertainty ◽  
Treatment Planning ◽  
Dose Calculations ◽  
Dose Distributions ◽  
Output Factor ◽  
Depth Dose ◽  
Calculated Dose ◽  
Organ At Risk ◽  
Work Planning ◽  
Physical Quantities

Abstract Both the measurement of the dose and the measurement of its distribution, like any other measurements, are subject to measurement uncertainties. These uncertainties affect all dose calculations and dose distributions in a patient’s body during treatment planning in radiotherapy. Measurement uncertainty is not a medical physicist’s error, but an inevitable element of their work. Planning the dose distribution in a patient’s body, we often try to reduce it in the volume of critical organs (OaR - Organ at Risk) or increase the minimum dose in the PTV region by a few percent. It is believed that the measurement uncertainty should be taken into account in these calculations at the stage of treatment planning. The paper presents the method of calculating the measurement uncertainty for different physical quantities in radiotherapy as percentage depth dose, profile function and output factor, due to the fact that these quantities have a particular impact on the calculated dose distributions in a patient’s body. The uncertainties that must be taken into account in planning treatment the planned dose per fraction and real in PTV, maybe different up to 4%.

scholarly journals A robustness check procedure for hypofractionated Gamma Knife radiosurgery

2018 ◽  
Vol 129 (Suppl1) ◽  
pp. 140-146
Author(s):  
Joshua Chiu ◽  
Steve Braunstein ◽  
Jean Nakamura ◽  
Philip Theodosopoulos ◽  
Penny Sneed ◽  
...  
Keyword(s):  
Gamma Knife ◽  
Treatment Plan ◽  
Gamma Knife Radiosurgery ◽  
Target Coverage ◽  
Quality Assurance Procedure ◽  
Dose Distributions ◽  
Treatment Delivery ◽  
Maximum Tolerance ◽  
Check Procedure ◽  
Robustness Check

OBJECTIVEInterfractional residual patient shifts are often observed during the delivery of hypofractionated brain radiosurgery. In this study, the authors developed a robustness treatment planning check procedure to assess the dosimetric effects of residual target shifts on hypofractionated Gamma Knife radiosurgery (GKRS).METHODSThe residual patient shifts were determined during the simulation process immediately after patient immobilization. To mimic incorporation of residual target shifts during treatment delivery, a quality assurance procedure was developed to sample and shift individual shots according to the residual uncertainties in the prescribed treatment plan. This procedure was tested and demonstrated for 10 hypofractionated GKRS cases.RESULTSThe maximum residual target shifts were less than 1 mm for the studied cases. When incorporating such shifts, the target coverage varied by 1.9% ± 2.2% (range 0.0%–7.1%) and selectivity varied by 3.6% ± 2.5% (range 1.1%–9.3%). Furthermore, when incorporating extra random shifts on the order of 0.5 mm, the target coverage decreased by as much as 7%, and nonisocentric variation in the dose distributions was noted for the studied cases.CONCLUSIONSA pretreatment robustness check procedure was developed and demonstrated for hypofractionated GKRS. Further studies are underway to implement this procedure to assess maximum tolerance levels for individual patient cases.

scholarly journals MR venography in gamma knife radiosurgery for parasagittal meningiomas: A technical note with the rationale of venous protection and a review of literature

2021 ◽  
Vol 16 (2) ◽  
pp. 307
Author(s):  
SushantaKumar Sahoo ◽  
ChiragKamal Ahuja ◽  
Sivashanmugam Dhandapani ◽  
Renu Madan ◽  
Parsee Tomar ◽  
...  
Keyword(s):  
Gamma Knife ◽  
Gamma Knife Radiosurgery ◽  
Technical Note ◽  
Mr Venography ◽  
Review Of Literature
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