scholarly journals CONTACT RADIATION THERAPY (BRACHYTHERAPY): CLINICAL CONCEPT OF DIRECT DOSIMETRY [IN VIVO] AND QUALITY ASSURANCE OF RADIATION THERAPY

2020 ◽  
Vol 66 (4) ◽  
pp. 398-403
Author(s):  
Vladimir Solodkiy ◽  
Andrey Pavlov ◽  
V. Titova ◽  
A. Tsybulsky
Keyword(s):  
Quality Assurance ◽  
Radiation Therapy ◽  
Improve Quality ◽  
Planning Systems ◽  
Calculation Data ◽  
Measurement Results ◽  
Clinical Concept ◽  
Contact Radiation

Contact radiation therapy (brachytherapy): the clinical concept of direct dosimetry [in vivo] and quality assurance of radiation therapy the issues of organizing the brachytherapy process with the possibility of confirming the calculated doses obtained on planning systems by direct dosimetry with scintillation small-size dosimeters with the technology of their placement, fixation and visualization are Considered. The coincidence of the calculation data with the measurement results helps to improve quality assurance, especially when using the fractionation mode of a single focal dose of more than 5-6 Gr.

scholarly journals CLINICAL PROBLEMS OF DIRECT DOSIMETRY (IN VIVO) IN CONTACT RADIATION THERAPY

2018 ◽  
Vol 7 (2) ◽  
pp. 19-24
Author(s):  
V. A. Titova ◽  
D. A. Kokontsev ◽  
T. S. Belle
Keyword(s):  
Radiation Therapy ◽  
Photodynamic Therapy ◽  
Fiber Optic ◽  
Absorbed Dose ◽  
Special Treatment ◽  
Effective Use ◽  
Contact Radiation ◽  
Clinical Problems ◽  
Treatment Surgery

The use of multicomponent methods of special treatment (surgery, polychemotherapy, radiation therapy, laser photodynamic therapy) in oncology requires the control of doses in the tumor and healthy organs with high accuracy. A method of direct dosimetry using fiber-optic scintillation dosimeter MCD-4 is proposed. The dosimeter is fixed on endostats and is visualized on CT/MRI. The coordinates are entered into the anatomical units and dosimetry calculations, the data are mapped, the doses are adjusted on medical grounds. The developed technique of direct dosimetry allows monitoring of the contact radiation therapy (CRT) procedure in real time and making the necessary changes and corrections during the treatment. The refinement of the absorbed dose values using calculations and direct dosimetry minimizes the risk of complications and ensures the possibility of effective use of other treatment methods, including photodynamic therapy, after CRT.

scholarly journals A method for in vivo treatment verification of IMRT and VMAT based on electronic portal imaging device

2021 ◽  
Vol 16 (1) ◽  
Author(s):  
Jun Zhang ◽  
Xiuqing Li ◽  
Miaomiao Lu ◽  
Qilin Zhang ◽  
Xile Zhang ◽  
...  
Keyword(s):  
Quality Assurance ◽  
Radiation Therapy ◽  
Measurement Data ◽  
Patient Specific ◽  
Imaging Device ◽  
Portal Imaging ◽  
Treatment Verification ◽  
Electronic Portal Imaging ◽  
In Vivo Treatment

Abstract Background Intensity-modulated radiation therapy (IMRT) and volume-modulated arc therapy (VMAT) are rather complex treatment techniques and require patient-specific quality assurance procedures. Electronic portal imaging devices (EPID) are increasingly used in the verification of radiation therapy (RT). This work aims to develop a novel model to predict the EPID transmission image (TI) with fluence maps from the RT plan. The predicted TI is compared with the measured TI for in vivo treatment verification. Methods The fluence map was extracted from the RT plan and corrections of penumbra, response, global field output, attenuation, and scatter were applied before the TI was calculated. The parameters used in the model were calculated separately for central axis and off-axis points using a series of EPID measurement data. Our model was evaluated using a CIRS thorax phantom and 20 clinical plans (10 IMRT and 10 VMAT) optimized for head and neck, breast, and rectum treatments. Results Comparisons of the predicted and measured images were carried out using a global gamma analysis of 3%/2 mm (10% threshold) to validate the accuracy of the model. The gamma pass rates for IMRT and VMAT were greater than 97.2% and 94.5% at 3%/2 mm, respectively. Conclusion We have developed an accurate and straightforward EPID-based quality assurance model that can potentially be used for in vivo treatment verification of the IMRT and VMAT delivery.

Quality assurance in contact radiation therapy: Physical, technical, and clinical aspects

1992 ◽  
Vol 26 (6) ◽  
pp. 318-318
Author(s):  
M. A. Sushchikhina ◽  
M. I. Nechushkin ◽  
G. R. Tsikhiseli ◽  
S. Yu. Morozova
Keyword(s):  
Quality Assurance ◽  
Radiation Therapy ◽  
Clinical Aspects ◽  
Contact Radiation

Diode in Vivo Dosimetry for Patients Receiving External Beam Radiation Therapy

10.37206/88 ◽  
2005 ◽  
Author(s):  
Ellen Yorke ◽  
Rodica Alecu ◽  
Li Ding ◽  
Doracy Fontenla ◽  
Andre Kalend ◽  
...  
Keyword(s):  
Radiation Therapy ◽  
External Beam Radiation Therapy ◽  
External Beam Radiation ◽  
In Vivo Dosimetry ◽  
External Beam ◽  
Beam Radiation
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