scholarly journals Acute effects on the thyroid gland after non-directed radiation therapy in children and adolescents

2013 ◽  
Vol 13 (3) ◽  
pp. 310-316 ◽  
Author(s):  
C. C. Bonato ◽  
H. B. Dias ◽  
M. da S. Alves ◽  
L. O. Duarte ◽  
T. M. Dias ◽  
...  
Keyword(s):  
Radiation Therapy ◽  
Thyroid Gland ◽  
Children And Adolescents ◽  
Thyroid Volume ◽  
Thyroid Stimulating Hormone ◽  
Planning System ◽  
Acute Injury ◽  
Follicular Epithelium ◽  
Treatment Planning System ◽  
Thyroid Peroxidase

AbstractBackgroundDuring radiation therapy, unwanted scatter to healthy tissues outside the target field may occur. Children and adolescents are more sensitive to radiation injury, and the thyroid gland is particularly susceptible to these effects.PurposeTo assess acute changes in thyroid function and volume in children and adolescents undergoing radiotherapy for a variety of non-thyroid cancers.Materials and MethodsThirty-one children and adolescents underwent radiation therapy of various body areas in which the thyroid was not included. Thyroid-stimulating hormone (TSH), thyroxine (T4), free thyroxine (fT4), triiodothyronine (T3), anti-thyroperoxidase antibodies and thyroglobulin were measured before, on the last day and at 1 and 3 months after the end of radiotherapy. Ultrasound scans were taken and 6- and 24-hour 131I uptake was measured before and after treatment. The scattered dose to the thyroid region was estimated with a treatment planning system or measured with thermoluminescent dosimeters.ResultsThe median radiation dose scattered to the thyroid was 296·6 cGy (IQR 16·7–1,709·0). Levels of TSH (p = 0·575), T4 (p = 0·950), fT4 (p = 0·510), T3 (p = 0·842), thyroglobulin (p = 0·620) and anti-thyroid peroxidase antibodies (p = 0·546) were statistically similar at all four time points. There were no differences between pre- and post-radiotherapy thyroid volume and 131I uptake (p = 0·692 and 0·92, respectively).ConclusionMore sensitive methods may be required to ascertain whether acute injury to the follicular epithelium occurs with lower radiation doses scattered to the thyroid.

Evaluating dose to thyroid gland in women with breast cancer during radiotherapy with different radiation energies at supraclavicular fossa region

2018 ◽  
Vol 17 (4) ◽  
pp. 373-376
Author(s):  
Marjaneh Mirsadraei ◽  
Mehdi Seilanian Toosi ◽  
Shokoufeh Mohebbi ◽  
Hojjat Khalili-Hezarjaribi
Keyword(s):  
Breast Cancer ◽  
Thyroid Gland ◽  
Thyroid Volume ◽  
Photon Beam ◽  
Planning System ◽  
Treatment Planning System ◽  
Radiation Absorption ◽  
Beam Radiation ◽  
Breast Cancer Radiotherapy ◽  
Supraclavicular Fossa

AbstractBackground and aimDuring the treatment of breast cancer, radiotherapy to the supraclavicular fossa region results in absorption of radiation by the thyroid gland and consequently leads to hypothyroidism in 40% of patients. The aim of this study was to compare thyroid gland radiation absorption during radiotherapy with different anterioposterior beam radiation of 6–15 and 15–15 MV photon beam energies.Materials and methodsIn total, 29 patients with breast cancer were recruited to this study. Adjuvant radiotherapy with a total dose of 50 Gy was performed for each participant. Thyroid gland dosimetric measurements were evaluated including, mean dose, minimum and maximum dose, and V20, V30, V40 and V50 (percentage of thyroid volume receiving ≥20, ≥30, ≥40 and ≥50 Gy, respectively). The irradiation delivered doses were measured using Prowess Panther treatment planning system (Version 5.5). All data were evaluated using SPSS software.ResultsIn total, 29 subjects with mean age of 53·4±9·4 were studied. According to the obtained results, at 15–15 MV energies, a significantly lower dose was absorbed by the thyroid gland, was observed in contrast to their counterparts who were treated with 6–15 MV photon beam energies.FindingsUsing 15–15 MV photon beam energies field can significantly reduce the absorbed dose to the thyroid gland and consequently can reduce the risk of developing hypothyroidism in breast cancer patients treated with radiotherapy.

scholarly journals Dosimetric Studies of Mixed Energy Intensity Modulated Radiation Therapy for Prostate Cancer Treatments

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
K. Abdul Haneefa ◽  
K. K. Shakir ◽  
A. Siddhartha ◽  
T. Siji Cyriac ◽  
M. M. Musthafa ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Radiation Therapy ◽  
Intensity Modulated Radiation Therapy ◽  
High Energy ◽  
Photon Beam ◽  
Planning System ◽  
Treatment Planning System ◽  
Intensity Modulated ◽  
Mixed Beam ◽  
Mixed Field

Dosimetric studies of mixed field photon beam intensity modulated radiation therapy (IMRT) for prostate cancer using pencil beam (PB) and collapsed cone convolution (CCC) algorithms using Oncentra MasterPlan treatment planning system (v. 4.3) are investigated in this study. Three different plans were generated using 6 MV, 15 MV, and mixed beam (both 6 and 15 MV). Fifteen patients with two sets of plans were generated: one by using PB and the other by using CCC for the same planning parameters and constraints except the beam energy. For each patient’s plan of high energy photons, one set of photoneutron measurements using solid state neutron track detector (SSNTD) was taken for this study. Mean percentage of V66 Gy in the rectum is 18.55±2.8, 14.58±2.1, and 16.77±4.7 for 6 MV, 15 MV, and mixed-energy plans, respectively. Mean percentage of V66 Gy in bladder is 16.54±2.1, 17.42±2.1, and 16.94±41.9 for 6 MV, 15 MV, and mixed-energy plans, respectively. Mixed fields neutron contribution at the beam entrance surface is 45.62% less than at 15 MV photon beam. Our result shows that, with negligible neutron contributions, mixed field IMRT has considerable dosimetric advantage.

Ct Image Fusion as a Tool for Measuring in 3D the Setup Errors during Conformal Radiotherapy for Prostate Cancer

2006 ◽  
Vol 92 (2) ◽  
pp. 118-123 ◽  
Author(s):  
Raffaella Cambria ◽  
Federica Cattani ◽  
Mario Ciocca ◽  
Cristina Garibaldi ◽  
Giampiero Tosi ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Radiation Therapy ◽  
Image Fusion ◽  
The Body ◽  
Planning System ◽  
Treatment Planning System ◽  
Ct Image ◽  
Fusion Technique ◽  
Setup Accuracy ◽  
Image Fusion Technique

Aims and Background The importance of optimal daily patient positioning has been stressed in order to ensure treatment reproducibility and gain in accuracy and precision. We report our data on the 3D setup uncertainty during radiation therapy for prostate cancer using the CT image fusion technique. Methods Ten consecutive patients scheduled for radiation therapy for prostate cancer underwent 5 prone position CT scans using an individualized immobilization cast. These different setups were analyzed using the image fusion module of the ERGO 3D-Line Medical System (Milan, Italy) treatment planning system. The isocenter and the body marker displacements were measured. Results The 3D isocenter dislocations were quantified: systematic error was Σ3D = 3.9 mm, whereas random error was σ3D = 1 mm. The mean of the minimum displacements was 0.2 ± 1 mm showing that the immobilization device used allows an accurate setup to be obtained. Single direction errors were also measured showing systematic errors, ΣAP = 2.6 mm, ΣLL = 0.6 mm, ΣSI = 3 mm in the anterior-posterior, latero-lateral, superior-inferior direction, respectively. Related random errors were σAP = 1 mm, σLL = 0.6 mm, σSI = 1.2 mm. In terms of accuracy, our uncertainties are similar to those reported in the literature. Conclusions By applying the CT image fusion technique, a 3D study on setup accuracy was performed. We demonstrated that the use of an individualized immobilization system for prostate treatment is adequate to obtain good setup accuracy, as long as a high-quality positioning control method, such as the stereoscopic X-ray-based positioning system, is used.

GEOMETRIC ALGORITHMS FOR STATIC LEAF SEQUENCING PROBLEMS IN RADIATION THERAPY

2004 ◽  
Vol 14 (04n05) ◽  
pp. 311-339 ◽  
Author(s):  
DANNY Z. CHEN ◽  
XIAOBO S. HU ◽  
SHUANG (SEAN) LUAN ◽  
CHAO WANG ◽  
XIAODONG WU
Keyword(s):  
Radiation Therapy ◽  
Polynomial Time ◽  
Geometric Algorithms ◽  
Planning System ◽  
Treatment Planning System ◽  
Polygonal Domain ◽  
Steiner Points ◽  
Delivery Times ◽  
Leaf Sequencing ◽  
Monotone Polygons

The static leaf sequencing (SLS) problem arises in radiation therapy for cancer treatments, aiming to accomplish the delivery of a radiation prescription to a target tumor in the minimum amount of delivery time. Geometrically, the SLS problem can be formulated as a 3-D partition problem for which the 2-D problem of partitioning a polygonal domain (possibly with holes) into a minimum set of monotone polygons is a special case. In this paper, we present new geometric algorithms for a basic case of the 3-D SLS problem (which is also of clinical value) and for the general 3-D SLS problem. Our basic 3-D SLS algorithm, based on new geometric observations, produces guaranteed optimal quality solutions using O(1) Steiner points in polynomial time; the previously best known basic 3-D SLS algorithm gives optimal outputs only for the case without considering any Steiner points, and its time bound involves a multiplicative factor of a factorial function of the input. Our general 3-D SLS algorithm is based on our basic 3-D SLS algorithm and a polynomial time algorithm for partitioning a polygonal domain (possibly with holes) into a minimum set of x-monotone polygons, and has a fast running time. Experiments of our SLS algorithms and software in clinical settings have shown substantial improvements over the current most popular commercial treatment planning system and the most well-known SLS algorithm in medical literature. The radiotherapy plans produced by our software not only take significantly shorter delivery times, but also have a much better treatment quality. This proves the feasibility of our software and has led to its clinical applications at the Department of Radiation Oncology at the University of Maryland Medical Center. Some of our techniques and geometric procedures (e.g., for partitioning a polygonal domain into a minimum set of x-monotone polygons) are interesting in their own right.

A dedicated treatment planning system for contrast-enhanced stereotactic synchrotron radiation therapy

2013 ◽  
Vol 29 ◽  
pp. e19
Author(s):  
M. Vautrin ◽  
M. Benkebil ◽  
Y. Prezado ◽  
I. Martínez-Rovirad ◽  
H. Elleaumea ◽  
...  
Keyword(s):  
Radiation Therapy ◽  
Synchrotron Radiation ◽  
Treatment Planning ◽  
Planning System ◽  
Treatment Planning System ◽  
Contrast Enhanced

scholarly journals Thyroid Functions in Bamboo-Shoots Consuming Children of Tripura, North-east India

2021 ◽  
Author(s):  
Indrajit Ray ◽  
A. K. Chandra ◽  
Saru Kumar Debbarma ◽  
Sekhar Kumar Mookerjee ◽  
Ajoy Datta ◽  
...  
Keyword(s):  
Urinary Iodine ◽  
Thyroid Volume ◽  
Thyroid Stimulating Hormone ◽  
Consumption Pattern ◽  
Thyroid Peroxidase ◽  
Free Triiodothyronine ◽  
Cross Sectional ◽  
North East ◽  
Bamboo Shoots ◽  
The Village

Abstract PurposeInformation on thyroid functions in populations consuming potent antithyroidal bamboo-shoots (BS) was found scanty. Therefore, to assess thyroid function in BS consuming children was found relevant.MethodsThis cross-sectional study included 127 children from 3 villages. Thyroid volume (TV), free thyroxine (FT4), free triiodothyronine (FT3), thyroid stimulating hormone (TSH), thyroglobulin antibody (Tg-Ab), thyroid peroxidase antibody (TPO-Ab), urinary iodine (UI), urinary thiocyanate (USCN), salt iodine (SI), water iodine (WI), and BS consumption pattern were assessed. ResultsVariable-wise overall mean±SDs/medians/interquartile ranges (IQR) were - age: 8.69±1.69/8.77/7.22-9.74 y, TVol: 0.82±0.27/0.82/0.67-0.96 ml, FT4: 19.5+5.6/20.1/16.9-22.0 pmol/L, FT3: 4.27+1.24/4.22/3.35-4.96 pmol/L, TSH: 2.44+1.39/2.33/1.60-3.15 mIU/L, Tg-Ab: 15.2+10.0/12.5/11.1-14.5 IU/ml, TPO-Ab: 5.58+12.25/3.89/2.90-5.11 IU/ml, UI: 117.4±58.5/108/73-160.5 µg/L, USCN: 0.99+0.67/0.8/0.5-1.2 mg/dl, WI: 4 .69±4.56/3.0/1.35–7µg/L, and BS consumption: 153.8±01.4/119/71.4–214.3 g/person/day respectively. Only 80.3% salt samples had ≥15 ppm iodine. Thyroid dysfunction prevalence was 6.3%. There were positive correlations between TV and FT4 (r=0.2466, p=0.005), UI and TSH (r=0.2633, p=0.003), TSH and FT4 (r=0.2135, p=0.016), TSH and FT3 (r=0.1898, p=0.033), USCN and FT4 (r=0.2477, p=0.005), Tg-Ab and TPO-Ab (r=0.3768, p=<0.001), and negative correlations between Tg-Ab and TSH (r=-0.2024, p=0.023), Tg-Ab and FT4 (r=-0.1869, p=0.035). In boys, USCN had a positive correlation with TPO-Ab (r=0.3069, p=0.018). The village having highest levels of BS consumption (p=0.037) and median UI showed higher TSH levels (p=0.037) and higher FT3 level (p=0.001) compared to the village of lowest BS consumption.ConclusionsThe BS consuming children appear at risk of developing hypothyroidism by Tg-Ab, which may partly be diminished by reducing BS consumption.

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