scholarly journals A PENCIL BEAM KERNEL MODEL FOR FLATTENING FILTER-FREE X-RAY BEAM

2017 ◽  
Author(s):  
Mehmet Ertuğrul Ertürk ◽  
Cemil Kocar ◽  
Salih Gürdall ◽  
Mehmet Tombakoğlu
Keyword(s):  
Pencil Beam ◽  
X Ray ◽  
Flattening Filter Free ◽  
Flattening Filter ◽  
Kernel Model

SU-E-T-555: Small Field Dosimetry of the Flattening Filter Free (FFF) X-Ray Photons

2011 ◽  
Vol 38 (6Part19) ◽  
pp. 3617-3617
Author(s):  
Y Wang ◽  
S Easterling ◽  
J Ting
Keyword(s):  
Small Field ◽  
X Ray ◽  
Small Field Dosimetry ◽  
Flattening Filter Free ◽  
Flattening Filter

MO-D-BRB-05: Skin Dose Study of the Flattening Filter Free (FFF) X-Ray Photons

2011 ◽  
Vol 38 (6Part25) ◽  
pp. 3710-3710
Author(s):  
Y Wang ◽  
S Easterling ◽  
J Ting
Keyword(s):  
Skin Dose ◽  
X Ray ◽  
Flattening Filter Free ◽  
Dose Study ◽  
Flattening Filter

scholarly journals Effectiveness of robust optimization in volumetric modulated arc therapy using 6 and 10 MV flattening filter-free beam therapy planning for lung stereotactic body radiation therapy with a breath-hold technique

2020 ◽  
Vol 61 (4) ◽  
pp. 575-585
Author(s):  
Hideharu Miura ◽  
Shuichi Ozawa ◽  
Yoshiko Doi ◽  
Minoru Nakao ◽  
Katsumaro Kubo ◽  
...  
Keyword(s):  
Radiation Therapy ◽  
Robust Optimization ◽  
Stereotactic Body Radiation Therapy ◽  
Volumetric Modulated Arc Therapy ◽  
Target Volume ◽  
Breath Holding ◽  
X Ray ◽  
Flattening Filter Free ◽  
Arc Therapy ◽  
Flattening Filter

Abstract We investigated the feasibility of a robust optimization with 6 MV X-ray (6X) and 10 MV X-ray (10X) flattening filter-free (FFF) beams in a volumetric modulated arc therapy (VMAT) plan for lung stereotactic body radiation therapy (SBRT) using a breath-holding technique. Ten lung cancer patients were selected. Four VMAT plans were generated for each patient; namely, an optimized plan based on the planning target volume (PTV) margin and a second plan based on a robust optimization of the internal target volume (ITV) with setup uncertainties, each for the 6X- and 10X-FFF beams. Both optimized plans were normalized by the percentage of the prescription dose covering 95% of the target volume (D95%) to the PTV (1050 cGy × 4 fractions). All optimized plans were evaluated using perturbed doses by specifying user-defined shifted values from the isocentre. The average perturbed D99% doses to the ITV, compared to the nominal plan, decreased by 369.1 (6X-FFF) and 301.0 cGy (10X-FFF) for the PTV-based optimized plan, and 346.0 (6X-FFF) and 271.6 cGy (10X-FFF) for the robust optimized plan, respectively. The standard deviation of the D99% dose to the ITV were 163.6 (6X-FFF) and 158.9 cGy (10X-FFF) for the PTV-based plan, and 138.9 (6X-FFF) and 128.5 cGy (10X-FFF) for the robust optimized plan, respectively. Robust optimized plans with 10X-FFF beams is a feasible method to achieve dose certainty for the ITV for lung SBRT using a breath-holding technique.

scholarly journals Evaluation of a 2D Diode Array Corresponding to Flattening Filter Free X-ray Beams

2018 ◽  
Vol 74 (5) ◽  
pp. 473-479
Author(s):  
Tomoko Kimura ◽  
Jun-ichi Fukunaga ◽  
Taka-aki Hirose ◽  
Ryota Hirayama
Keyword(s):  
Diode Array ◽  
X Ray ◽  
Flattening Filter Free ◽  
Flattening Filter

scholarly journals Effect of X-ray dose rates higher than 8 Gy/min on the functioning of cardiac implantable electronic devices

2020 ◽  
Vol 61 (3) ◽  
pp. 419-425 ◽  
Author(s):  
Kazuhiko Nakamura ◽  
Takahiro Aoyama ◽  
Naoki Kaneda ◽  
Masashi Otsuji ◽  
Yoshitaka Minami ◽  
...  
Keyword(s):  
Dose Rate ◽  
Treatment Plan ◽  
Electronic Devices ◽  
Normal Function ◽  
X Ray ◽  
Dose Rates ◽  
Cardiac Implantable Electronic Devices ◽  
Flattening Filter Free ◽  
Direct Irradiation ◽  
Flattening Filter

Abstract Direct irradiation may cause malfunctioning of cardiac implantable electronic devices (CIEDs). Therefore, a treatment plan that does not involve direct irradiation of CIEDs should be formulated. However, CIEDs may be directly exposed to radiation because of the sudden intrafractional movement of the patient. The probability of CIED malfunction reportedly depends on the dose rate; however, reports are only limited to dose rates ≤8 Gy/min. The purpose of this study was to investigate the effect of X-ray dose rates >8 Gy/min on CIED function. Four CIEDs were placed at the center of the radiation field and irradiated using 6 MV X-ray with flattening filter free (6 MV FFF) and 10 MV X-ray with flattening filter free (10 MV FFF). The dose rate was 4–14 Gy/min for the 6 MV FFF and 4–24 Gy/min for 10 MV FFF beams. CIED operation was evaluated with an electrocardiogram during each irradiation. Three CIEDs malfunctioned in the 6 MV FFF condition, and all four CIEDs malfunctioned in the 10 MV FFF condition, when the dose rate was >8 Gy/min. Pacing inhibition was the malfunction observed in all four CIEDs. Malfunction occurred simultaneously along with irradiation and simultaneously returned to normal function on stopping the irradiation. An X-ray dose rate >8 Gy/min caused a temporary malfunction due to interference. Therefore, clinicians should be aware of the risk of malfunction and manage patient movement when an X-ray dose rate >8 Gy/min is used for patients with CIEDs.

SU-F-J-26: Performance of 2.5MV Portal Imaging in Comparison with KV X-Ray and 6MV and Flattening-Filter-Free 6MV Portal Imaging

2016 ◽  
Vol 43 (6Part9) ◽  
pp. 3411-3411
Author(s):  
J Duan ◽  
Y Yang ◽  
A Faught ◽  
E Subashi ◽  
Q Wu ◽  
...  
Keyword(s):  
Portal Imaging ◽  
X Ray ◽  
Flattening Filter Free ◽  
Flattening Filter
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