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Japanese Journal of Medical Physics

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https://www.readbyqxmd.com/read/28701667/series-basic-exercises-using-excel-2
#1
Takeyuki Hashimoto
No abstract text is available yet for this article.
2017: Japanese Journal of Medical Physics
https://www.readbyqxmd.com/read/28701666/current-status-of-mr-linac-system
#2
Noriyuki Kadoya
Current status of MR-Linac System was reported. First, we introduced the history of development about MR-Linac System. We discussed the advantage of MR-Linac for radiotherapy. Next, we explained the electron return effect caused by magnetic field, resulting in different dose distribution, compared to dose distribution with no magnetic field. Our explanation about MR-Linac will help for understanding this system.
2017: Japanese Journal of Medical Physics
https://www.readbyqxmd.com/read/28701665/the-clinical-applications-of-polymer-gel-dosimetry-using-mri
#3
Kaoru Ono
Polymer gel dosimeters are devices that utilize the radiation-induced polymerization reactions of vinyl monomers in a gel to store information of radiation dose. They have some advantages over other dosimeters as the visual conformation and the direct read-out of three-dimensional (3D) radiation dose information for the dosimetric verification of intensity modulated radiotherapy (IMRT), volumetric modulated arc therapy (VMAT), and stereotactic radiotherapy (SRT) with steep dose gradients. In this report, the dosimetric uncertainties and potential for clinical applications of polymer gel dosimetry by the in-house developed 3D dose verification system for IMRT and VMAT QA is outlined...
2017: Japanese Journal of Medical Physics
https://www.readbyqxmd.com/read/28701664/multidimensional-image-analysis-for-high-precision-radiation-therapy
#4
Hidetaka Arimura, Mazen Soufi, Mohammad Haekal
High precision radiation therapy (HPRT) has been improved by utilizing conventional image engineering technologies. However, different frameworks are necessary for further improvement of HPRT. This review paper attempted to define the multidimensional image and what multidimensional image analysis is, which may be feasible for increasing the accuracy of HPRT. A number of researches in radiation therapy field have been introduced to understand the multidimensional image analysis. Multidimensional image analysis could greatly assist clinical staffs in radiation therapy planning, treatment, and prediction of treatment outcomes...
2017: Japanese Journal of Medical Physics
https://www.readbyqxmd.com/read/28701663/international-collaboration-on-medical-physics-in-nirs
#5
Shigekazu Fukuda
No abstract text is available yet for this article.
2017: Japanese Journal of Medical Physics
https://www.readbyqxmd.com/read/28701662/overview-of-jsps-core-to-core-program-forming-research-and-educational-hubs-of-medical-physics
#6
Masahiko Koizumi, Masaaki Takashina
To foster medical physicists, we introduce the achievement we made since 2011 under the national research project of the Japan Society for the Promotion of Science (JSPS) Core-to-Core program; 'Forming Research and Educational Hubs of Medical Physics.' On this basis and under the JSPS program, we promoted research and educational exchange with Indiana University (IU) in USA, University of Groningen (The UG) in the Netherland and other cooperating institutions such as University of Minnesota (UM).A total of 23 students and researchers were sent...
2017: Japanese Journal of Medical Physics
https://www.readbyqxmd.com/read/28701661/impact-of-different-independent-dose-verification-software-programs-for-secondary-check
#7
Takeshi Yamazaki, Masanobu Itano, Satoru Ishibashi, Yoshihiro Higuchi, Mikiko Yamashita, Megumi Kosaka, Nozomi Kobayashi, Hidenobu Tachibana
PURPOSE: A multi-institutional study was performed to identify the impact of different independent dose verification programs on independent dose verification software program. METHODS: Data for 1,543 treatment fields were collected in three institutions. RADCALC and Simple MU Analysis (Simple MU) using the Clarkson-based algorithm were used. RADCALC needs the input of radiological path length (RPL) from radiotherapy treatment planning systems (RTPSs) (Eclipse or Pinnacle(3))...
2017: Japanese Journal of Medical Physics
https://www.readbyqxmd.com/read/28701660/precision-in-wedge-off-axis-using-independent-dose-verification
#8
Hiroyuki Shimizu, Masanobu Itano, Takeshi Yamazaki, Ryo Takahashi, Tatsuya Kamima, Mikiko Yamashita, Hiromi Baba, Satoru Ishibashi, Yoshihiro Higuchi, Toshijiro Yamamoto, Yasuharu Sugawara, Aya Sato, Shiro Nishiyama, Satoshi Miyaoka, Daisuke Kawai, Hidenobu Tachibana
It is essential for quality assurance to verify the safety of each individual patient's plan in radiation therapy. The tolerance level for independent verification of monitor unit calculations for non-IMRT clinical radiotherapy has been shown in the AAPM TG114. Thus, we investigated the precision of independent MU (dose) verification considering a wedge off-axis calculation and we conducted a study at twelve institutes for independent verification with the wedge off-axis calculation. The results obtained with the wedge off-axis calculation showed better agreement with the treatment planning system calculation results than those without the former calculation in a phantom study and in the patient retrospective study...
2017: Japanese Journal of Medical Physics
https://www.readbyqxmd.com/read/28701659/preface-to-the-special-issue-for-110th-japanese-society-of-medical-physics-annual-meeting
#9
Toru Yamamoto
No abstract text is available yet for this article.
2017: Japanese Journal of Medical Physics
https://www.readbyqxmd.com/read/28442656/series-basic-exercises-using-excel-1
#10
REVIEW
Takeyuki Hashimoto
No abstract text is available yet for this article.
2016: Japanese Journal of Medical Physics
https://www.readbyqxmd.com/read/28442655/series-practical-evaluation-of-clinical-image-quality-4-determination-of-image-quality-in-digital-radiography-system
#11
REVIEW
Reiji Katayama
Recently, for medical imaging, digital radiography systems are widely used in clinical practices. However, a study in the past reported that a patient radiation exposure level by digital radiography is in fact not lower than that by analog radiography system. High level of attention needs to be paid for over-exposure when using the conventional analog radiography with a screen and a film, as it results in high density of the film. However, for digital radiography systems, since the automatic adjusting function of image density is equipped with them, no attention for radiation dose need to be paid...
2016: Japanese Journal of Medical Physics
https://www.readbyqxmd.com/read/28442654/utility-of-vmat-aspect-of-clinical-application
#12
REVIEW
Akihiro Haga
No abstract text is available yet for this article.
2016: Japanese Journal of Medical Physics
https://www.readbyqxmd.com/read/28442653/handling-density-conversion-in-tps
#13
REVIEW
Tomonori Isobe, Yutaro Mori, Hideyuki Takei, Eisuke Sato, Kiichi Tadano, Daisuke Kobayashi, Tetsuya Tomita, Takeji Sakae
Conversion from CT value to density is essential to a radiation treatment planning system. Generally CT value is converted to the electron density in photon therapy. In the energy range of therapeutic photon, interactions between photons and materials are dominated with Compton scattering which the cross-section depends on the electron density. The dose distribution is obtained by calculating TERMA and kernel using electron density where TERMA is the energy transferred from primary photons and kernel is a volume considering spread electrons...
2016: Japanese Journal of Medical Physics
https://www.readbyqxmd.com/read/28442652/an-introduction-to-optimization-theory
#14
REVIEW
Jun'ichi Kotoku
No abstract text is available yet for this article.
2016: Japanese Journal of Medical Physics
https://www.readbyqxmd.com/read/28442651/basics-of-monte-carlo-simulation-focusing-on-dose-to-medium-and-dose-to-water
#15
REVIEW
Kiichi Tadano, Tomonori Isobe, Eisuke Sato, Hideyuki Takei, Daisuke Kobayashi, Yutaro Mori, Tetsuya Tomita, Takeji Sakae
Treatment planning systems with highly accurate dose calculation algorithms such as Monte-Carlo method and linear Boltzmann transport equation are becoming popular thanks to a development of the computer technology. These algorithms use new concepts, dose-to-medium and dose-to-water. However, introducing these concepts can cause confusion in clinical sites. Basic knowledges about Monte-Carlo simulation and other corresponding algorithms were explained in this article such as the principles, the parameters and words of caution...
2016: Japanese Journal of Medical Physics
https://www.readbyqxmd.com/read/28442650/evolution-of-dose-calculation-algorithms-for-external-beam-treatment-planning
#16
REVIEW
Nanako Hirai, Sayaka Sato
No abstract text is available yet for this article.
2016: Japanese Journal of Medical Physics
https://www.readbyqxmd.com/read/28442649/the-handling-of-the-medical-device-program-with-pharmaceutical-and-medical-device-act
#17
Yusuke Shimizu
No abstract text is available yet for this article.
2016: Japanese Journal of Medical Physics
https://www.readbyqxmd.com/read/28442648/preface-to-the-special-issue-radiation-treatment-planning-system
#18
EDITORIAL
Teiji Nishio
No abstract text is available yet for this article.
2016: Japanese Journal of Medical Physics
https://www.readbyqxmd.com/read/28428500/mini-lecture-on-x-ray-computed-tomography-methods-for-evaluating-radiation-dose
#19
Kosuke Matsubara
No abstract text is available yet for this article.
2016: Japanese Journal of Medical Physics
https://www.readbyqxmd.com/read/28428499/series-utilization-of-differential-equations-and-methods-for-solving-them-in-medical-physics-4
#20
Kenya Murase
Partial differential equations are often used in the field of medical physics. In this (final) issue, the methods for solving the partial differential equations were introduced, which include separation of variables, integral transform (Fourier and Fourier-sine transforms), Green's function, and series expansion methods. Some examples were also introduced, in which the integral transform and Green's function methods were applied to solving Pennes' bioheat transfer equation and the Fourier series expansion method was applied to Navier-Stokes equation for analyzing the wall shear stress in blood vessels...
2016: Japanese Journal of Medical Physics
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