Dosimetric effect of rotational setup errors in single-isocenter volumetric-modulated arc therapy of multiple brain metastases
Conclusion: Our results indicate that correcting rotational uncertainties is critical in single-isocenter, multi-target SRS. For rotational deviations, radial distance of the target from isocenter along the respective axis has a strong influence on target coverage. For rotational setup deviation at a given radial distance larger targets tend to have lesser geometric miss compared to smaller targets. Mathematical model for spherical targets can be used to estimate V95 for given rotational errors. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - June 10, 2019 Category: Physics Authors: Kasirajan Tamil Selvan Ganesan Padma Murugesan Kesavan Revathy N Arunai Nambi Raj K Senthilnathan P Ramesh Babu Source Type: research
Investigation of internal target volumes using device and deviceless four-dimensional respiratory monitoring systems for moving targets in four-dimensional computed tomography acquisition
Conclusion: The results showed that the DL method is an effective way of image sorting in 4D acquisition for smaller target excursion. When the target motion exceeds 3 mm in A-P and L-R directions with S-I more than 10 mm, DB method is the choice due to its accuracy in reproducing the absolute target volume. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - June 10, 2019 Category: Physics Authors: Raghavendra Holla D Khanna Shubhangi Barsing Bhaskaran K Pillai Tharmarnadar Ganesh Source Type: research
Study on measurement of environmental radioactivity and assessment of radiological hazards in Kashmir Valley
Gopiraj AnnamalaiJournal of Medical Physics 2019 44(1):70-70 (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - March 10, 2019 Category: Physics Authors: Gopiraj Annamalai Source Type: research
Fabrication and characterization of a three-dimensional positive-ion detector and its applications
Kulandaivel MuthuveluJournal of Medical Physics 2019 44(1):68-69 (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - March 10, 2019 Category: Physics Authors: Kulandaivel Muthuvelu Source Type: research
Determination of optimal clinical target volume to planning target volume margins for conformal radiotherapy planning using image guidance system in rectal cancer in prone position
Conclusions: Image guidance is an effective method to evaluate patient setup errors. Good quality immobilization devices and stringent patient setup policies can help to reduce PTV margins further. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - March 10, 2019 Category: Physics Authors: Shashank Bansal Mouchumee Bhattacharyya Apurba Kumar Kalita Moirangthem Nara Singh Rubu Sunku Partha Pratim Medhi Ghritashee Bora Source Type: research
Radiation shielding for helical tomotherapy vault design
Conclusions: A typical helical tomotherapy vault design is proposed based on the calculated shielding thicknesses of protective barriers. Further, it is also concluded that tomotherapy machine can be installed in a vault designed for 6 MV conventional linear accelerator with minor modification. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - March 10, 2019 Category: Physics Authors: Amanjot Kaur PN Pawaskar G Sahani Source Type: research
Development of a method to determine electron density and effective atomic number of high atomic number solid materials using dual-energy computed tomography
Conclusions: DECT can be used as an effective tool for determining the effective atomic number and electron density of high atomic number substance. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - March 10, 2019 Category: Physics Authors: Avinav Bharati Susama Rani Mandal Arun Kumar Gupta Amlesh Seth Raju Sharma Ashu S Bhalla Chandan J Das S Chatterjee Pratik Kumar Source Type: research
Phantom-based feasibility studies on phase-contrast mammography at Indian synchrotron facility indus-2
Conclusion: It was observed in case of all the phantoms and test samples that EEI and EE/N values are relatively higher for images taken in the phase mode. The absorbed dose to air at imaging plane was found to be 75.59 mGy and 28.9 mGy for 12 and 16 keV SR energies, respectively. However, these dose values can be optimized by reducing the image acquisition time without compromising the image quality when clinical samples are imaged. This work demonstrates the feasibility of XPCI in mammography using 12 and 16 keV SR X-ray beams. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - March 10, 2019 Category: Physics Authors: Reena Sharma SD Sharma PS Sarkar B Singh AK Agrawal D Datta Source Type: research
Effective dose display system in gastric cancer X-ray screening
Conclusions: “Effective dose display system” was constructed to display effective dose immediately after gastric cancer X-ray screening. This system is on the way to be reformed by improving the regression equation on larger data. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - March 10, 2019 Category: Physics Authors: Kenyu Yamamoto Naoko Fujiwara Masahiko Kiyama Yoshihiro Takeda Tadao Kuwano Toshizo Katsuda Masami Azuma Toshinori Ito Source Type: research
Evaluation of nanoDot optically stimulated luminescence dosimeter for cone-shaped small-field dosimetry of cyberknife stereotactic radiosurgery unit: A monte carlo simulation and dosimetric verification study
Conclusion: Its low reliable readings for cones smaller than 15 mm should be considered before its in vivo applications of Cyberknife system. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - March 10, 2019 Category: Physics Authors: Fadil Akyol Neslihan Sarigul Mete Yeginer Yagiz Yedekci Haluk Utku Source Type: research
Extraction of retinal blood vessels on fundus images by kirsch & #39;s template and Fuzzy C-Means
Conclusion: The results show that this approach is a suitable alternative technique for the supervised method and it is support for similar fundus images dataset. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - March 10, 2019 Category: Physics Authors: T Jemima Jebaseeli C Anand Deva Durai J Dinesh Peter Source Type: research
Validation of three-dimensional electronic portal imaging device-based PerFRACTION & #8482; software for patient-specific quality assurance
Conclusions: PerFRACTIONTM appears reliable and valid under experimental conditions in air and with phantoms. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - March 10, 2019 Category: Physics Authors: A Aziz Sait Jason Figueredo Glenn W Jones Kai Jones Thomas McGowan Jeff Kapatoes Ramani Ramaseshan Source Type: research
Pretreatment dose verification in volumetric modulated arc therapy using liquid ionization chamber
Conclusions: The measured dose values by the two dosimeters and TPS calculated dose at a given point were found comparable suggesting that the LIC could be a good choice of dosimeter for pretreatment dose verification in VMAT. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - March 10, 2019 Category: Physics Authors: Nitin R Kakade Rajesh Kumar Sunil Dutt Sharma Vikram Mittal D Datta Source Type: research
Dosimetric comparison of four volumetric-modulated arc therapy beam arrangements utilized for hippocampal-sparing whole-brain radiation therapy
Conclusions: Overall, beam setup 3 was considered to be the best. It is worth mentioning that, apart from our results, the election of one of these beam arrangements might be dependent on the amount of patient workload at a specific institution. (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - March 10, 2019 Category: Physics Authors: Alejandro Prado Ana Isabel Milan & #233;s Eduardo Cabello Ra & #250;l D & #237;az Alejandro Ferrando Gustavo Pozo Mario Leonor Marta Manzano Source Type: research
News
Pratik KumarJournal of Medical Physics 2018 43(4):277-279 (Source: Journal of Medical Physics)
Source: Journal of Medical Physics - December 7, 2018 Category: Physics Authors: Pratik Kumar Source Type: research
