On the impact of absorbed dose specification, tissue heterogeneities and applicator heterogeneities on Monte Carlo‐based dosimetry of Ir‐192, Se‐75 and Yb‐169 in conventional and intensity modulated brachytherapy for the treatment of cervical cancer

2021 ◽  
Author(s):  
Marc Morcos ◽  
Akila N. Viswanathan ◽  
Shirin A. Enger
Keyword(s):  
Cervical Cancer ◽  
Monte Carlo ◽  
Absorbed Dose ◽  
Intensity Modulated ◽  
The Impact

scholarly journals A Monte Carlo Determination of Dose and Range Uncertainties for Preclinical Studies with a Proton Beam

Cancers ◽  
2021 ◽  
Vol 13 (8) ◽  
pp. 1889
Author(s):  
Arthur Bongrand ◽  
Charbel Koumeir ◽  
Daphnée Villoing ◽  
Arnaud Guertin ◽  
Ferid Haddad ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Proton Beam ◽  
Dose Response ◽  
Small Animal ◽  
Absorbed Dose ◽  
Normal Tissue Damage ◽  
Dose Homogeneity ◽  
And Control ◽  
The Impact

Proton therapy (PRT) is an irradiation technique that aims at limiting normal tissue damage while maintaining the tumor response. To study its specificities, the ARRONAX cyclotron is currently developing a preclinical structure compatible with biological experiments. A prerequisite is to identify and control uncertainties on the ARRONAX beamline, which can lead to significant biases in the observed biological results and dose–response relationships, as for any facility. This paper summarizes and quantifies the impact of uncertainty on proton range, absorbed dose, and dose homogeneity in a preclinical context of cell or small animal irradiation on the Bragg curve, using Monte Carlo simulations. All possible sources of uncertainty were investigated and discussed independently. Those with a significant impact were identified, and protocols were established to reduce their consequences. Overall, the uncertainties evaluated were similar to those from clinical practice and are considered compatible with the performance of radiobiological experiments, as well as the study of dose–response relationships on this proton beam. Another conclusion of this study is that Monte Carlo simulations can be used to help build preclinical lines in other setups.

The impact of daily bladder filling on small bowel dose for intensity modulated radiation therapy for cervical cancer

2019 ◽  
Vol 44 (2) ◽  
pp. 102-106 ◽  
Author(s):  
Victor E. Chen ◽  
Erin F. Gillespie ◽  
Ryan P. Manger ◽  
Lauren A. Skerritt ◽  
Josephine H. Tran ◽  
...  
Keyword(s):  
Cervical Cancer ◽  
Radiation Therapy ◽  
Small Bowel ◽  
Intensity Modulated Radiation Therapy ◽  
Bladder Filling ◽  
Intensity Modulated ◽  
The Impact

scholarly journals PROTECT: Prospective Phase-II-Trial Evaluating Adaptive Proton Therapy for Cervical Cancer to Reduce the Impact on Morbidity and the Immune System

Cancers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 5179
Author(s):  
Anouk Corbeau ◽  
Remi A. Nout ◽  
Jan Willem M. Mens ◽  
Nanda Horeweg ◽  
Jérémy Godart ◽  
...  
Keyword(s):  
Cervical Cancer ◽  
Radiation Therapy ◽  
Phase Ii ◽  
Proton Therapy ◽  
Phase Ii Trial ◽  
Locally Advanced ◽  
External Beam Radiation ◽  
Beam Radiation ◽  
Intensity Modulated ◽  
The Impact

External beam radiation therapy (EBRT) with concurrent chemotherapy followed by brachytherapy is a very effective treatment for locally advanced cervical cancer (LACC). However, treatment-related toxicity is common and reduces the patient’s quality of life (QoL) and ability to complete treatment or undergo adjuvant therapies. Intensity modulated proton therapy (IMPT) enables a significant dose reduction in organs at risk (OAR), when compared to that of standard intensity-modulated radiation therapy (IMRT) or volumetric-modulated arc therapy (VMAT). However, clinical studies evaluating whether IMPT consequently reduces side effects for LACC are lacking. The PROTECT trial is a nonrandomized prospective multicenter phase-II-trial comparing clinical outcomes after IMPT or IMRT/VMAT in LACC. Thirty women aged >18 years with a histological diagnosis of LACC will be included in either the IMPT or IMRT/VMAT group. Treatment includes EBRT (45 Gy in 25 fractions of 1.8 Gy), concurrent five weekly cisplatin (40 mg/m2), and 3D image (MRI)-guided adaptive brachytherapy. The primary endpoint is pelvic bones Dmean and mean bowel V15Gy. Secondary endpoints include dosimetric parameters, oncological outcomes, health-related QoL, immune response, safety, and tolerability. This study provides the first data on the potential of IMPT to reduce OAR dose in clinical practice and improve toxicity and QoL for patients with LACC.

Effects of density from various hip prosthesis materials on 6 MV photon beam: a Monte Carlo study

2017 ◽  
Vol 16 (2) ◽  
pp. 155-160
Author(s):  
M. Z. Abdul Aziz ◽  
F. N. Mohd Kamarulzaman ◽  
N. A. S. Mohd Termizi ◽  
N. Abdul Raof ◽  
A. A. Tajuddin
Keyword(s):  
Monte Carlo ◽  
Dose Distribution ◽  
Hip Prosthesis ◽  
Absorbed Dose ◽  
Monte Carlo Study ◽  
Ct Images ◽  
Photon Beam ◽  
Radiotherapy Planning ◽  
Depth Dose ◽  
The Impact

AbstractIn radiotherapy planning, computed tomography (CT) images are used to calculate the dose in the patient. However, a high density hip prosthesis can cause streaking artefacts in CT images, which make dose calculations for nearby organs inaccurate. This study aim to quantify the impact of a hip prosthesis on 6 MV photon beam dose distribution using the Monte Carlo (MC) simulation. To quantify the radiation dose at the hip prosthesis accurately, image processing techniques were used to generate CT images free from streak artefacts. MATLAB software was used to produce computer-generated phantoms consisting of bone, titanium, stainless steel and CoCrMo. Percentage depth dose (PDD) and beam profile were used to analyse the impact of the hip prosthesis on the dose distribution of the photon beam. PDD showed that the absorbed dose was reduced as the density of the material increased, and the dose was reduced by as much as 49% when the photon beam struck the highest density material (CoCrMo, 8·2g/cm3). However, dose was increased at the tissue-hip prosthesis interface (depths of 4 and 19cm). As the depth increased, the absorbed dose decreased due to attenuation of photons by the tissue and the metal.

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