LIVIVO - Das Suchportal für Lebenswissenschaften

switch to English language
Erweiterte Suche

Suchergebnis

Treffer 1 - 10 von insgesamt 75

Suchoptionen

  1. Artikel ; 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  Band 41, Heft 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-Begriff(e) Humans ; Monte Carlo Method ; Radiation Protection ; Radiography ; Scattering, Radiation ; Virtual Reality
    Sprache Englisch
    Erscheinungsdatum 2021-09-27
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 639411-5
    ISSN 1361-6498 ; 0952-4746
    ISSN (online) 1361-6498
    ISSN 0952-4746
    DOI 10.1088/1361-6498/ac16b1
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  2. Artikel ; 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.
    Sprache Englisch
    Erscheinungsdatum 2024-04-27
    Erscheinungsland United States
    Dokumenttyp 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
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  3. Artikel ; Online: Directional vector visualization of scattered rays in mobile c-arm fluoroscopy.

    Hizukuri, Kyoko / Fujibuchi, Toshioh / Arakawa, Hiroyuki

    Radiological physics and technology

    2024  Band 17, Heft 1, Seite(n) 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-Begriff(e) Humans ; Scattering, Radiation ; Radiation Protection/methods ; Computer Simulation ; X-Rays ; Fluoroscopy ; Phantoms, Imaging ; Radiation Dosage ; Occupational Exposure/prevention & control
    Sprache Englisch
    Erscheinungsdatum 2024-02-05
    Erscheinungsland Japan
    Dokumenttyp 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
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  4. Artikel ; 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  Band 10, Heft 4

    Abstract: ... ...

    Abstract Purpose
    Mesh-Begriff(e) Humans ; Tomography, X-Ray Computed/methods ; Algorithms ; Phantoms, Imaging ; Image Processing, Computer-Assisted/methods ; User-Computer Interface ; Radiographic Image Interpretation, Computer-Assisted/methods
    Sprache Englisch
    Erscheinungsdatum 2024-05-22
    Erscheinungsland England
    Dokumenttyp Journal Article
    ISSN 2057-1976
    ISSN (online) 2057-1976
    DOI 10.1088/2057-1976/ad4b20
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  5. Artikel: A Practical Method for Slice Spacing Measurement Using the American Association of Physicists in Medicine Computed Tomography Performance Phantom.

    Anam, Choirul / Naufal, Ariij / Dwihapsari, Yanurita / Fujibuchi, Toshioh / Dougherty, Geoff

    Journal of medical physics

    2024  Band 49, Heft 1, Seite(n) 103–109

    Abstract: Background: The slice spacing has a crucial role in the accuracy of computed tomography (CT) images in sagittal and coronal planes. However, there is no practical method for measuring the accuracy of the slice spacing.: Purpose: This study proposes a ...

    Abstract Background: The slice spacing has a crucial role in the accuracy of computed tomography (CT) images in sagittal and coronal planes. However, there is no practical method for measuring the accuracy of the slice spacing.
    Purpose: This study proposes a novel method to automatically measure the slice spacing using the American Association of Physicists in Medicine (AAPM) CT performance phantom.
    Methods: The AAPM CT performance phantom module 610-04 was used to measure slice spacing. The process of slice spacing measurement involves a pair of axial images of the module containing ramp aluminum objects located at adjacent slice positions. The middle aluminum plate of each image was automatically segmented. Next, the two segmented images were combined to produce one image with two stair objects. The centroid coordinates of two stair objects were automatically determined. Subsequently, the distance between these two centroids was measured to directly indicate the slice spacing. For comparison, the slice spacing was calculated by accessing the slice position attributes from the DICOM header of both images. The proposed method was tested on phantom images with variations in slice spacing and field of view (FOV).
    Results: The results showed that the automatic measurement of slice spacing was quite accurate for all variations of slice spacing and FOV, with average differences of 9.0% and 9.3%, respectively.
    Conclusion: A new automated method for measuring the slice spacing using the AAPM CT phantom was successfully demonstrated and tested for variations of slice spacing and FOV. Slice spacing measurement may be considered an additional parameter to be checked in addition to other established parameters.
    Sprache Englisch
    Erscheinungsdatum 2024-03-30
    Erscheinungsland India
    Dokumenttyp Journal Article
    ZDB-ID 1193902-3
    ISSN 1998-3913 ; 0971-6203
    ISSN (online) 1998-3913
    ISSN 0971-6203
    DOI 10.4103/jmp.jmp_155_23
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  6. Artikel ; Online: Simulating the head of a TrueBeam linear particle accelerator and calculating the photoneutron spectrum on the central axis of a 10-MV photon using particle and heavy-ion transport system code.

    Quoc, Soai Dang / Fujibuchi, Toshioh / Arakawa, Hiroyuki / Hamada, Keisuke

    Radiation protection dosimetry

    2024  Band 200, Heft 8, Seite(n) 779–790

    Abstract: Photon energy is higher than the (γ,n) threshold, allowing it to interact with the nuclei of materials with high z properties and liberate fast neutrons. This represents a potentially harmful source of radiation for humans and the environment. This study ...

    Abstract Photon energy is higher than the (γ,n) threshold, allowing it to interact with the nuclei of materials with high z properties and liberate fast neutrons. This represents a potentially harmful source of radiation for humans and the environment. This study validated the Monte Carlo simulation, using the particle and heavy-ion transport code system (PHITS) on a TrueBeam 10-MV linear particle accelerator's head shielding model and then used this PHITS code to simulate a photo-neutron spectrum for the transport of the beam. The results showed that, when comparing the simulated to measured PDD and crosslines, 100% of the γ-indexes were <1 (γ3%/3mm) for both simulations, for both phase-space data source and a mono energy source. Neutron spectra were recorded in all parts of the TrueBeam's head, as well as photon neutron spectra at three points on the beamline.
    Mesh-Begriff(e) Photons ; Particle Accelerators/instrumentation ; Monte Carlo Method ; Neutrons ; Humans ; Computer Simulation ; Radiation Protection/methods ; Heavy Ions ; Radiation Dosage ; Head/radiation effects ; Radiometry/methods
    Sprache Englisch
    Erscheinungsdatum 2024-05-20
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 225912-6
    ISSN 1742-3406 ; 0144-8420
    ISSN (online) 1742-3406
    ISSN 0144-8420
    DOI 10.1093/rpd/ncae124
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  7. Artikel ; 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  Band 16, Heft 2, Seite(n) 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-Begriff(e) 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
    Sprache Englisch
    Erscheinungsdatum 2023-03-06
    Erscheinungsland Japan
    Dokumenttyp 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
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  8. Artikel: [Report of short term study abroad in 2014].

    Fujibuchi, Toshioh

    Nihon Hoshasen Gijutsu Gakkai zasshi

    2015  Band 71, Heft 3, Seite(n) 279–283

    Mesh-Begriff(e) Austria ; International Agencies ; International Educational Exchange
    Sprache Japanisch
    Erscheinungsdatum 2015-03
    Erscheinungsland Japan
    Dokumenttyp 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
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  9. Artikel ; 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  Band 8, Heft 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-Begriff(e) Phantoms, Imaging ; Plastics ; Radiation Dosimeters ; Reproducibility of Results ; Scintillation Counting
    Chemische Substanzen Plastics
    Sprache Englisch
    Erscheinungsdatum 2022-07-13
    Erscheinungsland England
    Dokumenttyp Journal Article
    ISSN 2057-1976
    ISSN (online) 2057-1976
    DOI 10.1088/2057-1976/ac7c91
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

  10. Artikel ; 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  Band 42, Heft 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-Begriff(e) 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
    Sprache Englisch
    Erscheinungsdatum 2022-06-29
    Erscheinungsland England
    Dokumenttyp Journal Article
    ZDB-ID 639411-5
    ISSN 1361-6498 ; 0952-4746
    ISSN (online) 1361-6498
    ISSN 0952-4746
    DOI 10.1088/1361-6498/ac7914
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

    Zusatzmaterialien

    Kategorien

Zum Seitenanfang