نتایج جستجو برای: dosimetric characteristics

تعداد نتایج: 665504  

Journal: :iranian journal of medical physics 0
sanaz hariri tabrizi ph.d. student of radiation medicine engineering, , shahid beheshti university, tehran, iran alireza kamali asl assistant professor,radiation medicine engineering., shahid beheshti university, tehran, iran zohreh azma ph.d. student of radiation medicine engineering, , shahid beheshti university, tehran, iran

introduction: brachytherapy is one of the most common treatment modalities for gynecological cancer. the gzp6 brachytherapy system is one of the devices utilized in iran. it has been considered particularly due to its low cost compared to other more complete and established systems. this system has some deficiencies including lack of a treatment planning software for non-predefined treatments, ...

2012
Ju Chao Tsair - Fwu Lee Wei - Luen Huang

The main goal in this paper is to quantify the quality of different techniques for radiation treatment plans, a back-propagation artificial neural network (ANN) combined with biomedicine theory was used to model thirteen dosimetric parameters and to calculate two dosimetric indices. The correlations between dosimetric indices and quality of life were extracted as the features and used in the AN...

2012
Maurizio Amichetti Dante Amelio Giuseppe Minniti

Stereotactic radiosurgery (SRS) is an important treatment option for intracranial lesions. Many studies have shown the effectiveness of photon-SRS for the treatment of skull base (SB) tumours; however, limited data are available for proton-SRS.Several photon-SRS techniques, including Gamma Knife, modified linear accelerators (Linac) and CyberKnife, have been developed and several studies have c...

2017
Christina Zhou Nathan Bennion Rongtao Ma Xiaoying Liang Shuo Wang Kristina Zvolanek Megan Hyun Xiaobo Li Sumin Zhou Weining Zhen Chi Lin Andrew Wahl Dandan Zheng

BACKGROUND Type-C dose algorithms provide more accurate dosimetry for lung SBRT treatment planning. However, because current dosimetric protocols were developed based on conventional algorithms, its applicability for the new generation algorithms needs to be determined. Previous studies on this issue used small sample sizes and reached discordant conclusions. Our study assessed dose calculation...

Journal: :Medical physics 2005
S Vedam A Docef M Fix M Murphy P Keall

The synchronization of dynamic multileaf collimator (DMLC) response with respiratory motion is critical to ensure the accuracy of DMLC-based four dimensional (4D) radiation delivery. In practice, however, a finite time delay (response time) between the acquisition of tumor position and multileaf collimator response necessitates predictive models of respiratory tumor motion to synchronize radiat...

Journal: :Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology 2011
Barbara Dobler Christian Groeger Marius Treutwein Judith Alvarez-Moret Thomas Goetzfried Karin Weidner Petra Haertl Oliver Koelbl

Methods and results for commissioning of the complete VMAT delivery chain are presented for the combination of Nucletron's Oncentra MasterPlan® v3.3 with Elekta's Mosaiq® v1.6 and SynergyS® linac. VMAT specific linac commissioning included determination of the size of the minimal dynamic leaf gap. Dosimetric validation of the complete treatment chain was performed using a 2D-ionization-chamber-...

2012
Mohammad Taghi Bahreyni Toossi Mahdi Ghorbani Ali Asghar Mowlavi Ali Soleimani Meigooni

BACKGROUND Dosimetric characteristics of a high dose rate (HDR) GZP6 Co-60 brachytherapy source have been evaluated following American Association of Physicists in MedicineTask Group 43U1 (AAPM TG-43U1) recommendations for their clinical applications. MATERIALS AND METHODS MCNP-4C and MCNPX Monte Carlo codes were utilized to calculate dose rate constant, two dimensional (2D) dose distribution...

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