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Prediction of stopping‐power ratios in flattening‐filter free beams [PDF]
Medical Physics, 2010 PURPOSE: In recent years, there has been an increasing interest in flattening-filter free (FFF) beams. However, since the removal of the flattening filter will affect both the mean and the variance of the energy spectrum, current beam-quality specifiers ...
Crister Ceberg, Tommy Knöös
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Flattening Filter Free vs Flattened Beams for Breast Irradiation
International Journal of Radiation Oncology*Biology*Physics, 2013Flattening filter free (FFF) beams offer the potential for a higher dose rate, shorter treatment time, and lower peripheral dose. To investigate their role in large-field treatments, this study compared flattened and FFF beams for breast irradiation.Ten left breast clinical plans comprising 2 tangential beams and a medially located 3-field simultaneous
Spruijt, K.H. +6 more
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Absorbing filter to flatten Gaussian beams
Applied Optics, 1992An absorbing filter that flattens the Gaussian intensity profile of a laser beam has been developed. The filter was fabricated by dc magnetron sputtering a thin tantalum film, by using a combination of substrate masking and motion. A model of the filter production has been developed that successfully predicts the film profile and performance. A typical
S K, Dew, R R, Parsons
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A flattening filter for brachytherapy skin irradiation
Physics in Medicine and Biology, 2002Radioactive sources in close contact offer an alternative to superficial radiation in the treatment of skin lesions. A flattening filter was designed for a lead surface applicator to improve the skin dose distribution of a high dose rate (HDR) brachytherapy unit (Nucletron).
Tomas, Kron +3 more
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A passband-flattened acousto-optic filter
IEEE Photonics Technology Letters, 1995We have demonstrated a passband-flattened LiNbO/sub 3/ guided-wave acousto-optic tunable filter (AOTF). Passband flattening is achieved by approximating the predicted flattened-filter decaying-sine acoustic intensity drive function by two half cycles of a sine wave of successively lower intensity.
J. L. Jackel +3 more
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High dose rate and flattening filter free irradiation can be safely implemented in clinical practice [PDF]
International Journal of Radiation Biology, 2015 PURPOSE: We hypothesize that flattening filter free (FFF) high dose rate irradiation will decrease cell survival in normal and cancer cells with more pronounced effects in DNA repair deficient cells.
Ludwig Dubois +2 more
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Physica Medica, 2018
In recent years, field flattening free accelerators have been introduced in therapy practice. One of the objective of these measurements was to establish if the maze door, designed for accelerators operating with flattening filter can provide adequate shielding in field flattening free mode of operation.
Á Á, Tóth +3 more
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In recent years, field flattening free accelerators have been introduced in therapy practice. One of the objective of these measurements was to establish if the maze door, designed for accelerators operating with flattening filter can provide adequate shielding in field flattening free mode of operation.
Á Á, Tóth +3 more
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Design and characterization of flattening filter for high dose rate 192Ir and 60Co Leipzig applicators used in skin cancer brachytherapy: A Monte Carlo study [PDF]
Computers in Biology and Medicine, 2020 Purpose: This study aimed to design optimal flattening filters for high dose rate (HDR) 192Ir and 60Co Leipzig applicators which are used to treat skin cancer.
Bagher Farhood, , Mehran Mohseni
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A New Field Flattening Filter for the Clinac-4
Radiology, 1972Abstract A new field flattening filter was designed and constructed for the Varian Clinac-4 Linear Accelerator. Design considerations led to the construction of a conically shaped filter made of 94% lead and 6% antimony. The resultant beam profiles and isodose distributions are compared to those obtained with the brass filter supplied with the ...
H H, Hansen +3 more
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Beam-Flattening Filters for Cobalt-Therapy Units
Radiology, 1962This communication describes results with a removable aluminum beam flattener for both normal and wedge field isodose distributions. The work was carried out on the commercially available Model A Eldorado therapy unit. The cobalt-60 source was 2.5 cm. in diameter and measurements were made at an SSD of 80 cm.
R J, HORSLEY, L F, TUDGE
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