scholarly journals DEVIATION BETWEEN THE PLANNED DOSE AND THE IN VIVO DOSIMETRY RESULTS DURING POSTOPERATIVE IRRADIATION IN PATIENTS WITH UTERINE CANCER DEPENDING ON ANTHROPOMETRIC DATA

Author(s):  
O. Sukhina ◽  
◽  
A. Simbirova ◽  
V. Sukhin ◽  
◽  
...  

Topometry is an integral part of irradiation whose task is to repeat the position of the patient set by the simulator to repeat the PTV and the spatial relationship between the radiation field and the risk organs that were identified during planning. The dose distribution formulated in the plan is only an ideal model. There is some gap between the actual and planned dose distribution, especially in overweight patients. Objective: evaluate the effect of anthropometric data on the deviation between the planned dose and the results of dosimetry in vivo in patients with uterine cancer during postoperative irradiation. Materials and Methods. The authors analyzed the results of treatment of 110 patients with stage IB–II uterine cancer who were treated at the Department of Radiation Therapy of the Institute of Medical Radiology and Oncology of the National Academy of Medical Sciences of Ukraine from 2016 to 2019. The technique of classical fractionation was used with a single focal dose of 2.0 Gy 5 times a week, the total focal dose was 42.0–50.0 Gy. To assess the effect of the patient’s anthropometric data on the difference between the actual and calculated dose, the authors performed in vivo dosimetry after the first session and in the middle of the postoperative course of external beam radiation therapy. Results. Рatients with BSA < 1.92 m2, had the median relative deviation at the first session -4.12 %, after 20.0 Gy – 3.61 %, patients with BSA > 1.92 m2: -2.06 % and -1.55 % respectively. After 20 Gy 34.8 % of patients with BSA < 1.92 m2 there was an increase in deviation from the planned dose, 65.2 % a decrease, while in 56.1 % of patients with BSA > 1.92 m2 there was an increase, and in 43.9 % – its reduction. With increasing BMI, the actual dose received on the rectal mucosa in the tenth session of irradiation is approaching the calculated one. Conclusions. When irradiated on the ROKUS-AM device, we did not find a probable dependence of the influence of the constitutional features of patients between the received and planned radiation dose. When treated with a Clinac 600 C, only body weight and body mass index at the tenth irradiation session have a likely effect on the dose difference. Therefore, issues related to the individual approach to the treatment of uterine cancer, depending on anthropometric data is an urgent problem of modern radiotherapy. Key words: anthropometric data, obesity, radiation therapy, preradiation preparation, in vivo dosimetry, uterine cancer.

10.37206/88 ◽  
2005 ◽  
Author(s):  
Ellen Yorke ◽  
Rodica Alecu ◽  
Li Ding ◽  
Doracy Fontenla ◽  
Andre Kalend ◽  
...  

2013 ◽  
Vol 31 (15_suppl) ◽  
pp. 3578-3578 ◽  
Author(s):  
Chaitali Singh Nangia ◽  
Thomas H. Taylor ◽  
Walter Tsang ◽  
Jason Wong ◽  
Joseph Carmichael ◽  
...  

3578 Background: The risk of second primary colorectal cancers among rectal cancer patients has been described, but little is known about the risk of non-colorectal malignancies that may occur in the field of radiation. We attempted to quantify the risk, using data from the large population-based California Cancer Registry (CCR). Methods: We analyzed the CCR data for surgically-treated locoregional rectal cancer cases, diagnosed during the period 1988–2009. We excluded cases with second primary tumor (SPT) diagnosed within 12 months of initial diagnosis . Radiation treatment used was external beam radiation therapy. Standardized incidence ratios (SIR) with 95% confidence intervals (CI) were calculated to evaluate risk as compared to the underlying population after matching for age, sex, ethnicity, and time. Results: Of the study cohort of 13,418 rectal cancer cases, 1572 cases of SPTs were observed . The SIR was increased for small intestine cancer among cases receiving radiation treatment (4 cases observed vs. 1.01 cases expected; SIR=3.94, 95% CI 1.07-10.10) but not among cases lacking radiation treatment (4 observed vs. 4.45 expected; SIR=0.90, 5% CI 0.24-2.30). Among females treated with radiation, the SIR was increased for uterine cancer (12 observed vs. 5.59 expected; SIR=2.15, 95% CI 1.11 to 3.75) but not among cases lacking radiation therapy (23 observed vs. 26.17 expected; SIR=0.88, 95% CI 0.56-1.32). Among males receiving radiation treatment, the SIR for prostate cancer was decreased (23 observed vs. 69.78 expected; SIR=0.33; 95% CI 0.21 to 0.49) but of borderline significance among males lacking radiation therapy (243 observed vs. 276.97 expected; SIR=0.88, 95% CI 0.77-0.99). No significant differences were observed for cancers of the vagina, cervix, ovary, kidney, bladder, penis, testes, or leukemia based on prior radiation treatment for rectal cancer. Conclusions: Patients receiving pelvic radiation for treatment of rectal cancer have a subsequently higher than expected incidence of small intestine and uterine cancer. The incidence of prostate cancer appears to fall after pelvic radiation. These unexpected findings suggest complex relationships associated with radiation treatment for rectal cancer and SPT risk.


2003 ◽  
Vol 69 (3) ◽  
pp. 285-289 ◽  
Author(s):  
Mario Ciocca ◽  
Roberto Orecchia ◽  
Cristina Garibaldi ◽  
Elena Rondi ◽  
Alberto Luini ◽  
...  

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