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Article ; Online: Radiation protection education using virtual reality for the visualisation of scattered distributions during radiological examinations.

Fujibuchi, Toshioh

Journal of radiological protection : official journal of the Society for Radiological Protection

2021 Volume 41, Issue 4

Abstract: When working in radiology and patient assistance in medical facilities, radiation workers need to understand how to properly protect themselves and others from scattered radiation. In this study, a visualisation method is examined to facilitate the ... ...

Abstract	When working in radiology and patient assistance in medical facilities, radiation workers need to understand how to properly protect themselves and others from scattered radiation. In this study, a visualisation method is examined to facilitate the understanding of the spread of scattered radiation in radiography, computerised tomography (CT), and angiography rooms, and the application of this system for radiation protection education is proposed. X-ray radiography, x-ray CT, and angiography rooms were constructed using the particle and heavy ion transport code system, and the scattered radiation distributions that occurred when a patient was irradiated with x-rays were simulated. The three-dimensional (3D) distribution of each moment was continuously displayed to create a four-dimensional (4D) distribution. Using the obtained data, a radiation protection education seminar was conducted that included exercises to allow the students to confirm the presence of scattered radiation from any direction. The effectiveness of the scattered radiation visualisation data was evaluated using an interview. The position of the assistant for conducting standing chest radiographs that experienced the least scattered radiation was determined to be at the side and foot side of the patient. As a result of an interview that was provided to the participants following the seminar, the effectiveness of this system for providing education about radiation protection was confirmed. The visualisation method allowed the students to better understand the behaviour of radiation and the sources of scattered radiation. The visualisation of 3D and 4D scattered radiation distributions in radiological examination rooms can intuitively enhance the understanding of the spread of invisible radiation and the appropriate methods of mitigating radiation exposure.
MeSH term(s)	Humans ; Monte Carlo Method ; Radiation Protection ; Radiography ; Scattering, Radiation ; Virtual Reality
Language	English
Publishing date	2021-09-27
Publishing country	England
Document type	Journal Article
ZDB-ID	639411-5
ISSN	1361-6498 ; 0952-4746
ISSN (online)	1361-6498
ISSN	0952-4746
DOI	10.1088/1361-6498/ac16b1
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Article ; Online: Developing simulation-based learning application for radiation therapy students at pre-clinical stage.

Hasoomi, Nafise / Fujibuchi, Toshioh / Arakawa, Hiroyuki

Journal of medical imaging and radiation sciences

2024

Abstract: Introduction: Simulation-based education has been particularly valuable as a preclinical training method that adequately prepares students for clinical practice, including simulation in educational programs enhances the quality of learning outcomes. ... ...

Abstract	Introduction: Simulation-based education has been particularly valuable as a preclinical training method that adequately prepares students for clinical practice, including simulation in educational programs enhances the quality of learning outcomes. However, relevant previous research has exhibited several crucial limitations, with most of them having focused solely on the setup procedures. This study aimed to outline the development of an educational application in radiationtherapy and emphasizes the essential factors that radiation therapist technologists(RTTs) must consider in the treatment room from the perspective of experienced RTTs. Method: We connected the virtual pendants to the linear accelerator components using C# programming and Unity. Customized scripts were assigned to specific linear accelerator (LINAC) functions, and the patient and RTT avatars were developed. We also included audio feedback for the realistic gantry movement sounds. Result: This study outlines various aspects of radiotherapy procedures duringtreatment, such as the simulation of patient positioning, treatment fields, and pendantfunctions, aimed toward enabling the effective use of virtual reality technology inradiation therapy. Discussion: This study explores the potential of an avatar-based app for radiotherapy education, providing foundational data for future trials. Conclusion: Simulation learning is the most advantageous pre-clinical instrument for equipping students with the skills necessary for clinical practice. This study's resultsare expected to facilitate radiotherapy students' adoption of clinical replacement applications and improve collaborative partnerships and knowledge sharing. Notably, this application complements traditional learning methods, further enhancing the overall educational experience.
Language	English
Publishing date	2024-04-27
Publishing country	United States
Document type	Journal Article
ZDB-ID	2426513-5
ISSN	1876-7982 ; 1939-8654
ISSN (online)	1876-7982
ISSN	1939-8654
DOI	10.1016/j.jmir.2024.04.005
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Article ; Online: Directional vector visualization of scattered rays in mobile c-arm fluoroscopy.

Hizukuri, Kyoko / Fujibuchi, Toshioh / Arakawa, Hiroyuki

Radiological physics and technology

2024 Volume 17, Issue 1, Page(s) 288–296

Abstract: Previous radiation protection-measure studies for medical staff who perform X-ray fluoroscopy have employed simulations to investigate the use of protective plates and their shielding effectiveness. Incorporating directional information enables users to ... ...

Abstract	Previous radiation protection-measure studies for medical staff who perform X-ray fluoroscopy have employed simulations to investigate the use of protective plates and their shielding effectiveness. Incorporating directional information enables users to gain a clearer understanding of how to position protective plates effectively. Therefore, in this study, we propose the visualization of the directional vectors of scattered rays. X-ray fluoroscopy was performed; the particle and heavy-ion transport code system was used in Monte Carlo simulations to reproduce the behavior of scattered rays in an X-ray room by reproducing a C-arm X-ray fluoroscopy system. Using the calculated results of the scattered-ray behavior, the vectors of photons scattered from the phantom were visualized in three dimensions. A model of the physician was placed on the directional vectors and dose distribution maps to confirm the direction of the scattered rays toward the physician when the protective plate was in place. Simulation accuracy was confirmed by measuring the ambient dose equivalent and comparing the measured and calculated values (agreed within 10%). The directional vectors of the scattered rays radiated outward from the phantom, confirming a large amount of backscatter radiation. The use of a protective plate between the patient and the physician's head part increased the shielding effect, thereby enhancing radiation protection for the physicians compared to cases without the protective plate. The use of directional vectors and the surrounding dose-equivalent distribution of this method can elucidate the appropriate use of radiation protection plates.
MeSH term(s)	Humans ; Scattering, Radiation ; Radiation Protection/methods ; Computer Simulation ; X-Rays ; Fluoroscopy ; Phantoms, Imaging ; Radiation Dosage ; Occupational Exposure/prevention & control
Language	English
Publishing date	2024-02-05
Publishing country	Japan
Document type	Journal Article
ZDB-ID	2433581-2
ISSN	1865-0341 ; 1865-0333
ISSN (online)	1865-0341
ISSN	1865-0333
DOI	10.1007/s12194-024-00779-w
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Article ; Online: A novel method for developing contrast-detail curves from clinical patient images based on statistical low-contrast detectability.

Anam, Choirul / Naufal, Ariij / Sutanto, Heri / Fujibuchi, Toshioh / Dougherty, Geoff

Biomedical physics & engineering express

2024

Abstract: Purpose: This study aimed to develop a method to extract statistical low-contrast detectability (LCD) and develop contrast-detail (C-D) curves from clinical patient images. Method: The LCD measurement and C-D curve development on the patient images were ...

Abstract	Purpose: This study aimed to develop a method to extract statistical low-contrast detectability (LCD) and develop contrast-detail (C-D) curves from clinical patient images. Method: The LCD measurement and C-D curve development on the patient images were carried out in the region of air surrounding the patient as an alternative for a homogeneous region within the patient. A simple graphical user interface (GUI) was created to set the initial configuration for interest (ROI), ROI size, and minimum-detectable contrast (MDC). The process was started by segmenting with a threshold between -980 HU and -1024 HU to get an air mask. The mask was trimmed from the patient center coordinates to avoid distortion from the table scan. The mask was used to automatically place square ROIs with a predetermined size. The mean pixel values in Hounsfield units (HU) within each ROI was calculated. Next, the standard deviation (SD) from all the means was obtained. The for a particular target size was generated by multiplying SD by 3.29. A C-D curve was obtained by iterating this process for other ROI sizes. The method was applied to the homogeneous phantom to find the correlation of the parameters inside and outside of the phantom, and implemented on 30 patient images. Results: Phantom images show a very strong correlation between LCDs obtained from outside and inside the phantom, with R2 of 0.97, 0.96, 0.92, 0.93, 0.80, and 0.88 for tube currents of 80, 100, 120, 140, 160, and 200 mA, respectively. This showed that the air region can act as a surrogate for a homogenous region in the phantom to obtain the LCD and C-D curve. Conclusion: The C-D curves obtained from outside the ACR phantom show a strong linear correlation with those from inside the phantom.
Language	English
Publishing date	2024-05-14
Publishing country	England
Document type	Journal Article
ISSN	2057-1976
ISSN (online)	2057-1976
DOI	10.1088/2057-1976/ad4b20
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Article ; Online: Dose estimation for cone-beam computed tomography in image-guided radiation therapy for pelvic cancer using adult mesh-type reference computational phantoms.

Cumur, Ceyda / Fujibuchi, Toshioh / Arakawa, Hiroyuki / Hamada, Keisuke

Radiological physics and technology

2023 Volume 16, Issue 2, Page(s) 203–211

Abstract: The use of cone-beam computed tomography (CBCT) is expanding owing to its installation in linear accelerators for radiation therapy, and the imaging dose induced by this system has become the center of attention. Here, the dose to patients caused by the ... ...

Abstract	The use of cone-beam computed tomography (CBCT) is expanding owing to its installation in linear accelerators for radiation therapy, and the imaging dose induced by this system has become the center of attention. Here, the dose to patients caused by the CBCT imager was investigated. Organ doses and effective doses for male and female mesh-type reference computational phantoms (MRCPs) and pelvis CBCT mode, routinely used for pelvic irradiation, were estimated using the Particle and Heavy Ion Transport Code System. The simulation results were confirmed based on the point-dose measurements. The estimated organ doses for male MRCPs with/without raised arms and for female MRCPs with/without raised arms were 0.00286-35.6 mGy, 0.00286-35.1 mGy, 0.00933-39.5 mGy, and 0.00931-39.0 mGy, respectively. The anticipated effective doses for male MRCPs with/without raised arms and female MRCPs with/without raised arms irradiated by pelvis CBCT mode were 4.25 mSv, 4.16 mSv, 7.66 mSv, and 7.48 mSv, respectively. The results of this study will be useful for patients who undergo image-guided radiotherapy with CBCT. However, because this study only covered one type of cancer with one type of imager, and image quality was not considered, more studies should be conducted to estimate the radiation dose from imaging devices in radiation therapy.
MeSH term(s)	Humans ; Male ; Adult ; Female ; Radiotherapy, Image-Guided/methods ; Pelvic Neoplasms/diagnostic imaging ; Pelvic Neoplasms/radiotherapy ; Radiotherapy Dosage ; Computer Simulation ; Phantoms, Imaging ; Cone-Beam Computed Tomography/methods ; Monte Carlo Method ; Radiation Dosage
Language	English
Publishing date	2023-03-06
Publishing country	Japan
Document type	Journal Article
ZDB-ID	2433581-2
ISSN	1865-0341 ; 1865-0333
ISSN (online)	1865-0341
ISSN	1865-0333
DOI	10.1007/s12194-023-00708-3
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Article: [Report of short term study abroad in 2014].

Fujibuchi, Toshioh

Nihon Hoshasen Gijutsu Gakkai zasshi

2015 Volume 71, Issue 3, Page(s) 279–283

MeSH term(s)	Austria ; International Agencies ; International Educational Exchange
Language	Japanese
Publishing date	2015-03
Publishing country	Japan
Document type	Journal Article
ZDB-ID	2269092-X
ISSN	1881-4883 ; 0369-4305
ISSN (online)	1881-4883
ISSN	0369-4305
DOI	10.6009/jjrt.2015_JSRT_71.3.279
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Article ; Online: Visualization of dose distribution and basic study of dose estimation using plastic scintillator and digital camera.

Yoshitani, Hiroshi / Fujibuchi, Toshioh / Anam, Choirul

Biomedical physics & engineering express

2022 Volume 8, Issue 5

Abstract: Radiation can be visualized using a scintillator and a digital camera. If the amount of light emitted by the scintillator increases with dose, the dose estimation can be obtained from the amount of light emitted. In this study, the basic performance of ... ...

Abstract	Radiation can be visualized using a scintillator and a digital camera. If the amount of light emitted by the scintillator increases with dose, the dose estimation can be obtained from the amount of light emitted. In this study, the basic performance of the scintillator and digital camera system was evaluated by measuring computed tomography dose index (CTDI). A circular plastic scintillator plate was sandwiched between polymethyl methacrylate (PMMA) phantoms, and x-rays were irradiated to them while rotating the x-ray tube to confirm changes in light emission. In addition, CTDI was estimated from the amount of light emitted by the scintillator during the helical scan and compared with the value measured from dosimeter. The scintillator emitted light while changing its distribution according to the movement of the x-ray tube. The measured CTDI
MeSH term(s)	Phantoms, Imaging ; Plastics ; Radiation Dosimeters ; Reproducibility of Results ; Scintillation Counting
Chemical Substances	Plastics
Language	English
Publishing date	2022-07-13
Publishing country	England
Document type	Journal Article
ISSN	2057-1976
ISSN (online)	2057-1976
DOI	10.1088/2057-1976/ac7c91
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Article ; Online: Dose estimation for cone-beam computed tomography in image-guided radiation therapy using mesh-type reference computational phantoms and assuming head and neck cancer.

Cumur, Ceyda / Fujibuchi, Toshioh / Hamada, Keisuke

Journal of radiological protection : official journal of the Society for Radiological Protection

2022 Volume 42, Issue 2

Abstract: This study aimed to estimate the additional dose the cone-beam computed tomography (CBCT) system integrated into the Varian TrueBeam linear accelerator delivers to a patient with head and neck cancer using mesh-type International Commission on ... ...

Abstract	This study aimed to estimate the additional dose the cone-beam computed tomography (CBCT) system integrated into the Varian TrueBeam linear accelerator delivers to a patient with head and neck cancer using mesh-type International Commission on Radiological Protection reference computational phantoms. In the first part, for use as a benchmark for the accuracy of the Monte Carlo geometry of CBCT, Particle and Heavy Ion Transport code System (PHITS) calculations were confirmed against measured lateral and depth dose profiles using a computed tomography dose profiler. After obtaining good agreement, organ dose calculations were performed by PHITS using mesh-type reference computational phantom (MRCP) and irradiating the neck region; the effective dose was calculated utilising absorbed organ doses and tissue weighting factors for male and female MRCP. Substantially, it has been found that the effective doses for male and female MRCP are 0.81 and 1.06 mSv, respectively. As this study aimed to assess the imaging dose from the CBCT system used in image-guided radiation therapy, it is required to take into account this dose in terms of both the target organ and surrounding tissues. Although the absorbed organ dose values and effective dose values obtained for both MRCP males and females were small, attention should be paid to the additional dose resulting from CBCT. This study can create awareness on the importance of doses arising from imaging techniques, especially CBCT.
MeSH term(s)	Cone-Beam Computed Tomography/methods ; Female ; Head and Neck Neoplasms/diagnostic imaging ; Head and Neck Neoplasms/radiotherapy ; Humans ; Male ; Monte Carlo Method ; Phantoms, Imaging ; Radiation Dosage ; Radiotherapy, Image-Guided/methods ; Surgical Mesh
Language	English
Publishing date	2022-06-29
Publishing country	England
Document type	Journal Article
ZDB-ID	639411-5
ISSN	1361-6498 ; 0952-4746
ISSN (online)	1361-6498
ISSN	0952-4746
DOI	10.1088/1361-6498/ac7914
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Jg. 1995 - 2021: Lesesall (1.OG)
ab Jg. 2022: Lesesaal (EG)

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Article ; Online: Development and evaluation of the effectiveness of educational material for radiological protection that uses augmented reality and virtual reality to visualise the behaviour of scattered radiation.

Nishi, Kazuki / Fujibuchi, Toshioh / Yoshinaga, Takashi

Journal of radiological protection : official journal of the Society for Radiological Protection

2022 Volume 42, Issue 1

Abstract: Understanding the behaviour of scattered radiation is important for learning appropriate radiation protection methods, but many existing visualisation systems for radiation require special devices, making it difficult to use them in education. The ... ...

Abstract	Understanding the behaviour of scattered radiation is important for learning appropriate radiation protection methods, but many existing visualisation systems for radiation require special devices, making it difficult to use them in education. The purpose of this study was to develop teaching material for radiation protection that can help visualise the scattered radiation with augmented reality (AR) and virtual reality (VR) on a web browser, develop a method for using it in education and examine its effectiveness. The distribution of radiation during radiography was calculated using Monte Carlo simulation, and teaching material was created. The material was used in a class for department of radiological technology students and its influence on motivation was evaluated using a questionnaire based on the evaluation model for teaching materials. In addition, text mining was used to evaluate impressions objectively. Educational material was developed that can be used in AR and VR for studying the behaviour of scattered radiation. The results of the questionnaire showed that the average value of each item was more than four on a five-point scale, indicating that the teaching material attracted the interest of users. Through text mining, it could be concluded that there was improved understanding of, and confidence in, radiation protection.
MeSH term(s)	Augmented Reality ; Computer Simulation ; Humans ; Radiation Protection ; Teaching Materials ; Virtual Reality
Language	English
Publishing date	2022-01-17
Publishing country	England
Document type	Journal Article
ZDB-ID	639411-5
ISSN	1361-6498 ; 0952-4746
ISSN (online)	1361-6498
ISSN	0952-4746
DOI	10.1088/1361-6498/ac3e0a
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Zs.A 1886: Show issues

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Article: [Dispatch Report on the 11th Annual Scientific Meeting of Thai Medical Physicist Society (TMPS 2019)].

Matsubara, Kosuke / Fujibuchi, Toshioh

Nihon Hoshasen Gijutsu Gakkai zasshi

2019 Volume 75, Issue 4, Page(s) 402–403

Language	Japanese
Publishing date	2019-04-22
Publishing country	Japan
Document type	Journal Article
ZDB-ID	2269092-X
ISSN	1881-4883 ; 0369-4305
ISSN (online)	1881-4883
ISSN	0369-4305
DOI	10.6009/jjrt.2019_JSRT_75.4.402
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