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  1. Article ; Online: [About Japanese Journal of Radiological Technology!]

    Chida, Koichi

    Nihon Hoshasen Gijutsu Gakkai zasshi

    2024  Volume 80, Issue 4, Page(s) I

    MeSH term(s) Technology, Radiologic ; Japan ; Periodicals as Topic ; Societies, Scientific ; East Asian People
    Language Japanese
    Publishing date 2024-03-31
    Publishing country Japan
    Document type Editorial ; Journal Article
    ZDB-ID 2269092-X
    ISSN 1881-4883 ; 0369-4305
    ISSN (online) 1881-4883
    ISSN 0369-4305
    DOI 10.6009/jjrt.2024-2346
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: [Dr.Yuji Kaga].

    Chida, Koichi

    Nihon Hoshasen Gijutsu Gakkai zasshi

    2023  Volume 79, Issue 8, Page(s) 827–837

    Language Japanese
    Publishing date 2023-08-16
    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.2023-2235
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: What are useful methods to reduce occupational radiation exposure among radiological medical workers, especially for interventional radiology personnel?

    Chida, Koichi

    Radiological physics and technology

    2022  Volume 15, Issue 2, Page(s) 101–115

    Abstract: Protection against occupational radiation exposure in clinical settings is important. This paper clarifies the present status of medical occupational exposure protection and possible additional safety measures. Radiation injuries, such as cataracts, have ...

    Abstract Protection against occupational radiation exposure in clinical settings is important. This paper clarifies the present status of medical occupational exposure protection and possible additional safety measures. Radiation injuries, such as cataracts, have been reported in physicians and staff who perform interventional radiology (IVR), thus, it is important that they use shielding devices (e.g., lead glasses and ceiling-suspended shields). Currently, there is no single perfect radiation shield; combinations of radiation shields are required. Radiological medical workers must be appropriately educated in terms of reducing radiation exposure among both patients and staff. They also need to be aware of the various methods available for estimating/reducing patient dose and occupational exposure. When the optimizing the dose to the patient, such as eliminating a patient dose that is higher than necessary, is applied, exposure of radiological medical workers also decreases without any loss of diagnostic benefit. Thus, decreasing the patient dose also reduces occupational exposure. We propose a novel four-point policy for protecting medical staff from radiation: patient dose Optimization, Distance, Shielding, and Time (pdO-DST). Patient dose optimization means that the patient never receives a higher dose than is necessary, which also reduces the dose received by the staff. The patient dose must be optimized: shielding is critical, but it is only one component of protection from radiation used in medical procedures. Here, we review the radiation protection/reduction basics for radiological medical workers, especially for IVR staff.
    MeSH term(s) Humans ; Occupational Exposure/prevention & control ; Radiation Dosage ; Radiation Exposure/prevention & control ; Radiation Injuries/prevention & control ; Radiation Protection ; Radiology, Interventional
    Language English
    Publishing date 2022-05-24
    Publishing country Japan
    Document type Journal Article ; Review
    ZDB-ID 2433581-2
    ISSN 1865-0341 ; 1865-0333
    ISSN (online) 1865-0341
    ISSN 1865-0333
    DOI 10.1007/s12194-022-00660-8
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  4. Article: [Seven Years after the Great East Japan Earthquake: Build Back Better and Radiological Science].

    Chida, Koichi

    Nihon Hoshasen Gijutsu Gakkai zasshi

    2019  Volume 75, Issue 8, Page(s) 787–798

    MeSH term(s) Earthquakes ; Japan ; Radiography ; Radiology
    Language Japanese
    Publishing date 2019-08-21
    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_75.8.787
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: [Radiation Dose Reduction through the Optimization of Mask Images in Cerebral Angiography].

    Hachiya, Kota / Chida, Koichi / Matsuda, Yoshikazu

    Nihon Hoshasen Gijutsu Gakkai zasshi

    2024  Volume 80, Issue 4, Page(s) 365–373

    Abstract: Purpose: To verify the effectiveness of optimizing the number of mask images in DSA for radiation dose reduction during cerebral angiography.: Methods: A total of 60 angiography sessions in 2 times for 30 patients performed by the same operator were ... ...

    Abstract Purpose: To verify the effectiveness of optimizing the number of mask images in DSA for radiation dose reduction during cerebral angiography.
    Methods: A total of 60 angiography sessions in 2 times for 30 patients performed by the same operator were included in this study. In order to compare the effects of optimization to change the injection delay time of DSA from 1 s to the shortest possible time, the number of mask images, the number of imaging frames, and radiation doses between sessions were compared and analyzed retrospectively.
    Results: In one DSA run, the number of mask images was decreased from 6 (5-7) to 3 (2-3) frames (p<0.01)/57.1% (median [IQR]/reduction rate), the number of imaging frames was decreased from 34 (32-36) to 32 (29-34) frames (p<0.01)/7.9%, and the radiation dose was decreased from 33 (23-47) to 30 (21-40) mGy (p<0.01)/8.3%. In magnification angiography, the reductions rate was significantly increased. In one angiography session, the number of mask images was decreased from 45 (35-72) to 19 (16-34) frames (p<0.01)/54.6%, the number of imaging frames was decreased from 242 (199-385) to 211 (181-346) frames (p<0.01)/8.3%, the radiation dose of DSA was decreased from 295 (190-341) to 242 (167-305) mGy (p<0.01)/11.6%, and the total radiation dose was decreased from 369 (259-418) to 328 (248-394) mGy (p<0.01)/7.5%.
    Conclusion: Using the shortest possible injection delay time for the number of mask image optimization was an effective radiation dose reduction method.
    MeSH term(s) Humans ; Radiation Dosage ; Cerebral Angiography/methods ; Male ; Female ; Middle Aged ; Retrospective Studies ; Aged ; Adult
    Language Japanese
    Publishing date 2024-03-19
    Publishing country Japan
    Document type English Abstract ; Journal Article
    ZDB-ID 2269092-X
    ISSN 1881-4883 ; 0369-4305
    ISSN (online) 1881-4883
    ISSN 0369-4305
    DOI 10.6009/jjrt.2024-1386
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article: [Seven Years after the Great East Japan Earthquake: Build Back Better and Radiological Science].

    Chida, Koichi

    Nihon Hoshasen Gijutsu Gakkai zasshi

    2018  Volume 74, Issue 9, Page(s) I

    MeSH term(s) Disasters ; Earthquakes ; Japan ; Radiography ; Radiology
    Language Japanese
    Publishing date 2018-09-20
    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.2018_JSRT_74.9.I
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  7. Article ; Online: Awareness of Medical Radiologic Technologists of Ionizing Radiation and Radiation Protection.

    Yashima, Sachiko / Chida, Koichi

    International journal of environmental research and public health

    2022  Volume 20, Issue 1

    Abstract: Japanese people experienced the Hiroshima and Nagasaki atomic bombings, the Japan Nuclear Fuel Conversion Co. criticality accident, it was found that many human resources are needed to respond to residents' concerns about disaster exposure in the event ... ...

    Abstract Japanese people experienced the Hiroshima and Nagasaki atomic bombings, the Japan Nuclear Fuel Conversion Co. criticality accident, it was found that many human resources are needed to respond to residents' concerns about disaster exposure in the event of a radiation disaster. Medical radiologic technologists learn about radiation from the time of their training, and are engaged in routine radiographic work, examination explanations, medical exposure counseling, and radiation protection of staff. By learning about nuclear disasters and counseling, we believe they can address residents' concerns. In order to identify items needed for training, we examined the perceptions of medical radiologic technologists in the case of different specialties, modalities and radiation doses. In 2016, 5 years after the Fukushima Daiichi nuclear power plant accident, we conducted a survey of 57 medical radiologic technologists at two medical facilities with different specialties and work contents to investigate their attitudes toward radiation. 42 participants answered questions regarding sex, age group, presence of children, health effects of radiation exposure, radiation control, generation of X rays by diagnostic X ray equipment, and radiation related units. In a comparison of 38 items other than demographic data, 14 showed no significant differences and 24 showed significant differences. This study found that perceptions of radiation were different among radiology technologists at facilities with different specialties. The survey suggested the possibility of identifying needed training items and providing effective training.
    MeSH term(s) Child ; Humans ; Radiation Protection ; Radiation Exposure ; Radiology ; Fukushima Nuclear Accident ; Radiation, Ionizing ; Japan
    Language English
    Publishing date 2022-12-28
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2175195-X
    ISSN 1660-4601 ; 1661-7827
    ISSN (online) 1660-4601
    ISSN 1661-7827
    DOI 10.3390/ijerph20010497
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  8. Article ; Online: Effective Risk Communications through Personalized Consultations with Pregnant Women and Parents by Radiologic Technologists after the 2011 Fukushima Daiichi Nuclear Disaster.

    Yashima, Sachiko / Chida, Koichi

    The Tohoku journal of experimental medicine

    2022  Volume 256, Issue 4, Page(s) 259–269

    Abstract: The Great East Japan Earthquake and Tsunami that occurred in March 2011 not only resulted in the loss of many human lives due to earthquakes and tsunamis, but also led to the occurrence of nuclear accidents involving the widespread diffuse release of ... ...

    Abstract The Great East Japan Earthquake and Tsunami that occurred in March 2011 not only resulted in the loss of many human lives due to earthquakes and tsunamis, but also led to the occurrence of nuclear accidents involving the widespread diffuse release of radioactive materials at the Fukushima Daiichi Nuclear Power Plant (FDNPP). The nuclear accident created great apprehension among residents of the Fukushima Prefecture, where the FDNPP is located, and residents of Northeastern Japan outside of Fukushima, such as the south region of the Miyagi Prefecture, which is adjacent to the northern part of Fukushima Prefecture. The Miyagi Prefecture is located approximately 50 to 120 km from the FDNPP. In Miyagi before the nuclear accident, nuclear disaster drills including respondent to residents' anxieties had been conducted at Onagawa Town, Ishinomaki City and prefectural office, and radiologic technologists had participated in the drills. In the face of the actual nuclear disaster, radiologic technologists carried out personalized consultation activities with the aim of eliminating anxiety among pregnant women and parents with infants at two local governments in the south region of Miyagi. After the activities, we conducted questionnaire survey on the activities, and were able to obtain evaluations and various opinions. This paper discusses regarding the efforts to personalized consultation and the results of questionnaire survey conducted by the radiologic technologists in the southern Miyagi following the FDNPP accident.
    MeSH term(s) Female ; Fukushima Nuclear Accident ; Humans ; Japan/epidemiology ; Parents ; Pregnancy ; Pregnant Women ; Referral and Consultation ; Tsunamis
    Language English
    Publishing date 2022-03-10
    Publishing country Japan
    Document type Journal Article
    ZDB-ID 123477-8
    ISSN 1349-3329 ; 0040-8727
    ISSN (online) 1349-3329
    ISSN 0040-8727
    DOI 10.1620/tjem.2022.J001
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Ua VI Zs.155: Show issues Location:
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  9. Article ; Online: Image Quality and Radiation Dose of Conventional and Wide-Field High-Resolution Cone-Beam Computed Tomography for Cerebral Angiography: A Phantom Study.

    Kawauchi, Satoru / Chida, Koichi / Hamada, Yusuke / Tsuruta, Wataro

    Tomography (Ann Arbor, Mich.)

    2023  Volume 9, Issue 5, Page(s) 1683–1693

    Abstract: There has been an increase in the use of interventional neuroradiology procedures because of their non-invasiveness compared to surgeries and the improved image quality of fluoroscopy, digital subtraction angiography, and rotational angiography. Although ...

    Abstract There has been an increase in the use of interventional neuroradiology procedures because of their non-invasiveness compared to surgeries and the improved image quality of fluoroscopy, digital subtraction angiography, and rotational angiography. Although cone-beam computed tomography (CBCT) images are inferior to multi-detector CT images in terms of low-contrast detectability and lower radiation doses, CBCT scans are frequently performed because of their accessibility. This study aimed to evaluate the image quality and radiation dose of two different high-resolution CBCTs (HR CBCT): conventional (C-HR CBCT) and wide-field HR CBCT (W-HR CBCT). The modulation transfer function (MTF), noise power spectrum (NPS), and contrast-to-noise ratio (CNR) were used to evaluate the image quality. On comparing the MTF of C-HR CBCT with a 256 × 256 matrix and that of W-HR CBCT with a 384 × 384 matrix, the MTF of W-HR CBCT with the 384 × 384 matrix was larger. A comparison of the NPS and CNR of C-HR CBCT with a 256 × 256 matrix and W-HR CBCT with a 384 × 384 matrix showed that both values were comparable. The reference air kerma values were equal for C-HR CBCT and W-HR CBCT; however, the value of the kerma area product was 1.44 times higher for W-HR CBCT compared to C-HR CBCT. The W-HR CBCT allowed for improved spatial resolution while maintaining the image noise and low-contrast detectability by changing the number of image matrices from 256 × 256 to 384 × 384. Our study revealed the image characteristics and radiation dose of W-HR CBCT. Given its advantages of low-contrast detectability and wide-area imaging with high spatial resolution, W-HR CBCT may be useful in interventional neuroradiology for acute ischemic stroke.
    MeSH term(s) Humans ; Cerebral Angiography ; Ischemic Stroke ; Tomography, X-Ray Computed ; Cone-Beam Computed Tomography ; Radiation Dosage
    Language English
    Publishing date 2023-09-01
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ISSN 2379-139X
    ISSN (online) 2379-139X
    DOI 10.3390/tomography9050134
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  10. Article ; Online: Usefulness of the spectral shaping dual-source computed tomography imaging technique in posterior corrective fusion for adolescent idiopathic scoliosis.

    Noto, Yoshiyuki / Endo, Yuki / Ohashi, Masayuki / Hirano, Toru / Kuramoto, Tatsuya / Chida, Koichi / Watanabe, Kei

    European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society

    2024  Volume 33, Issue 2, Page(s) 706–712

    Abstract: Purpose: Since childhood exposure to radiation has been demonstrated to increase cancer risk with increase in radiation dose, reduced radiation exposure during computed tomography (CT) evaluation is desired for adolescent idiopathic scoliosis (AIS). ... ...

    Abstract Purpose: Since childhood exposure to radiation has been demonstrated to increase cancer risk with increase in radiation dose, reduced radiation exposure during computed tomography (CT) evaluation is desired for adolescent idiopathic scoliosis (AIS). Therefore, this retrospective study aimed to investigate the radiation dose of dual-source CT using a spectral shaping technique and the accuracy of the thoracic pedicle screw (TPS) placement for posterior spinal fusion (PSF) in patients with AIS.
    Methods: Fifty-nine female patients with thoracic AIS who underwent PSF using CT-guided TPSs were included and divided into two groups comprised of 23 patients who underwent dual-source CT (DSCT) with a tin filter (DSCT group) and 36 who underwent conventional multislice CT (MSCT group). We assessed the CT radiation dose using the CT dose index (CTDI
    Results: The DSCT and MSCT groups differed significantly (p < 0.001) in the mean CTDI
    Conclusion: Spectral shaping DSCT with a tube-based tin filter allowed a 75% radiation dose reduction while achieving TPS insertion accuracy similar to procedures based on conventional CT without spectral shaping.
    MeSH term(s) Humans ; Adolescent ; Female ; Child ; Retrospective Studies ; Scoliosis/diagnostic imaging ; Scoliosis/surgery ; Tin ; Tomography, X-Ray Computed ; Dioctyl Sulfosuccinic Acid ; Phenolphthalein
    Chemical Substances Tin (7440-31-5) ; Dioctyl Sulfosuccinic Acid (10041-19-7) ; Phenolphthalein (6QK969R2IF)
    Language English
    Publishing date 2024-01-17
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1115375-1
    ISSN 1432-0932 ; 0940-6719
    ISSN (online) 1432-0932
    ISSN 0940-6719
    DOI 10.1007/s00586-023-08006-7
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 3437: Show issues Location:
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    Jg. 1995 - 2021: Lesesall (2.OG)
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