Measurements of peripheral dose for multileaf collimator based linear accelerator

Raman, Balasubramanian; Sellakumar, P.; Bilimagga, Ramesh S; Supe, Sanjay S.; Sankar, B.

doi:10.1016/s1507-1367(06)71073-2

Cited by 3 publications

(3 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These reasons may cause differences especially in measurement near the eld edge. R. Balasubramanian [7] found that: PD distribution distance at 5cm -20cm from eld edge in different depth is approximately equal shows similar result with us.…”

Section: Discussionsupporting

confidence: 85%

“…These two reason mentioned above caused higher energy radiation beam have less peripheral dose than lower energy radiation beam. R. Balasubramanian et al found that: in 15MV and 6MV beam energy, for peripheral dose at 5cm distance from eld edge, the peripheral dose is 3.42% and 3.07% [7] , which have similar result with us. For measurement of peripheral dose, choice of measurement instrument is always a controversial topic.…”

Section: Discussionsupporting

confidence: 81%

See 1 more Smart Citation

Evaluation of Peripheral Dose for Varian Trilogy Linear Accelerator

Yang

Pang

Sun

et al. 2021

Preprint

View full text Add to dashboard Cite

Objective To measure and evaluate the peripheral dose(PD) for Trilogy linear accelerator in different setup condition and investigate the feasibility of the diode dosimetric system to measure the peripheral dose.Methods Peripheral dose were measured using a CC13 ionization chamber and the diode dosimetric system in a set of solid water phantom. Measurements were performed for different depths, field sizes, physical and virtual wedge, radiation beam energy and up at distance of 1cm to 31cm beyond the field edges. PD is separated into PDleakage and PDscatter by measure peripheral dose with or without scattering phantom. CRIS phantom was used for this research with the diode dosimetric system at the interest points of the breast, thyroid, and lens.Results All the measure data were normalized to isocenter. The measured PD decreases exponentially as a function of distance up to 31cm from the edge. PD shows no significant relevant to depth and it increases with the increased field size. As the physics wedge angle increase, PD increases about 1%, but enhanced dynamic wedge decreased 2-3% compared with open field. As the beam energy increase, PD decreased. All PD data difference less than 1% between CC13 ionization chamber and diode. The PD of CRIS phantom for Volume Modulated ARC Therapy (VMAT) is minimum and the mean dose for breast、thyroid and lens is 6.72 mGy、2.90 mGy and 2.37 mGy respectively.Conclusion The diode dosimetric system provides an sufficient assessment in peripheral regions of 6MV X-ray beam. PD changes because of field size、depth、beam energy etc and the assessment of PD would be helpful to evaluate the dose received by the relevant critical structures near the treatment field. Furthermore it is advantaged to use external shielding for critical organs.

show abstract

Section: Discussionsupporting

confidence: 85%

Section: Discussionsupporting

confidence: 81%

Evaluation of Peripheral Dose for Varian Trilogy Linear Accelerator

Yang

Pang

Sun

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…It has been proven before in near and distant past by many authors [1][2][3][4][5][6][7][8][9][10][11][12][13] that there exists a significant et al 2 cited BIER III report which summarizes the threshold dose values for different organs, like breast, lungs, thyroid, gonads and foetus in pregnant women. A single fraction of more than 10 cGy can induce serous foetus damage.…”

Section: Background and Aimmentioning

confidence: 99%

Estimation of peripheral dose from Co60 beam in water phantom measured in Secondary Standard Dosimetry Laboratory, Pakistan

Shahban¹,

Hussain

Mehmood

et al. 2017

Reports of Practical Oncology & Radiotherapy

View full text Add to dashboard Cite

A simple analytical model for a fast 3D assessment of peripheral photon dose during coplanar isocentric photon radiotherapy

et al. 2022

View full text Add to dashboard Cite

Considering that cancer survival rates have been growing and that nearly two-thirds of those survivors were exposed to clinical radiation during its treatment, the study of long-term radiation effects, especially secondary cancer induction, has become increasingly important. To correctly assess this risk, knowing the dose to out-of-field organs is essential. As it has been reported, commercial treatment planning systems do not accurately calculate the dose far away from the border of the field; analytical dose estimation models may help this purpose. In this work, the development and validation of a new three-dimensional (3D) analytical model to assess the photon peripheral dose during radiotherapy is presented. It needs only two treatment-specific input parameter values, plus information about the linac-specific leakage, when available. It is easy to use and generates 3D whole-body dose distributions and, particularly, the dose to out-of-field organs (as dose–volume histograms) outside the 5% isodose for any isocentric treatment using coplanar beams [including intensity modulated radiotherapy and volumetric modulated arc therapy (VMAT)]. The model was configured with the corresponding Monte Carlo simulation of the peripheral absorbed dose for a 6 MV abdomen treatment on the International Comission on Radiological Protection (ICRP) 110 computational phantom. It was then validated with experimental measurements using thermoluminescent dosimeters in the male ATOM anthropomorphic phantom irradiated with a VMAT treatment for prostate cancer. Additionally, its performance was challenged by applying it to a lung radiotherapy treatment very different from the one used for training. The model agreed well with measurements and simulated dose values. A graphical user interface was developed as a first step to making this work more approachable to a daily clinical application.

show abstract

Measurements of peripheral dose for multileaf collimator based linear accelerator

Cited by 3 publications

References 8 publications

Evaluation of Peripheral Dose for Varian Trilogy Linear Accelerator

Evaluation of Peripheral Dose for Varian Trilogy Linear Accelerator

Estimation of peripheral dose from Co60 beam in water phantom measured in Secondary Standard Dosimetry Laboratory, Pakistan

A simple analytical model for a fast 3D assessment of peripheral photon dose during coplanar isocentric photon radiotherapy

Contact Info

Product

Resources

About