Japanese Journal of Radiological Technology
Online ISSN : 1881-4883
Print ISSN : 0369-4305
ISSN-L : 0369-4305
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Volume 71, Issue 6
Displaying 1-8 of 8 articles from this issue
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Opening Article
Original
  • Classifying Ontology towards an Application for Radiological Technology
    Akihisa Fukuda, Shintaro Tsuji, Ayako Yagahara, Naoki Nishimoto, Katsu ...
    2015 Volume 71 Issue 6 Pages 505-511
    Published: 2015
    Released on J-STAGE: June 20, 2015
    DOIhttps://doi.org/10.6009/jjrt.2015_JSRT_71.6.505
    JOURNAL FREE ACCESS
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    This study aims to grasp the target area of the literature on ontology and to apply it in radiological technology. We used Google scholar to search the literature containing the keyword “ontology”. Our search identified and extracted 162,381 words from 29 manuscripts and used the 8,706 nouns excluding duplicates as individual variable. Using a cluster analysis, we categorized the documents to one of the following five classifications: (1) “Systematization of vocabulary by text mining”, (2) “Hierarchy of language information”, (3) “Conceptualization of situation”, (4) “Standardization of lexical information”, and (5) “Visualization of the concepts related to the problem”. We propose that the terminologies in (2), (4), and (5) cluster can be used in radiological technology field.
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Notes
  • Development of an Optimizing Program of Scanning Parameters for Double Inversion Recovery MRI
    Norio Hayashi, Kazuma Yarita, Kozue Sakata, Shunichi Motegi, Hiroyuki ...
    2015 Volume 71 Issue 6 Pages 512-519
    Published: 2015
    Released on J-STAGE: June 20, 2015
    DOIhttps://doi.org/10.6009/jjrt.2015_JSRT_71.6.512
    JOURNAL FREE ACCESS
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    The purpose of this study was to develop an optimizing program of scanning parameters for double inversion recovery (DIR) MRI. The optimization algorithm consists of the following steps: (1) obtaining the initial parameters (TR, TE, and T1 values of the two attenuated tissues); (2) iterative calculation for minimization of errors; and (3) determination of the optimized TI1st and TI2nd. To evaluate the developed algorithm, we performed the phantom and simulation studies using the phantoms which were imitated T1 values of white and gray matters and cerebrospinal fluid. In addition, white matter attenuated inversion recovery (WAIR) and gray matter attenuated inversion recovery (GAIR) images were obtained by optimized scan parameters in one volunteer. The developed algorithm could calculate the optimized TI1st and TI2nd values at once. Results of summation of signal intensity (SI) of two attenuated tissues shows that the SI of the two tissues were well-attenuated using the theoretical values which were calculated using the developed algorithm. The correlation coefficient of the SI of the phantom of the gray matter between actual and simulation measurements was r=0.997. The SI obtained by actual measurements well correlated with the SI obtained by the simulation measurements. The WAIR and GAIR images in the volunteer were well enhanced gray or white matters. We thus conclude that it is possible to calculate the optimized parameters for the DIR-MRI using the developed algorithm.
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  • The Impact That SPECT Collection Angle and Collection Orbit Gives to an Image: Myocardial Digital Phantom Study
    Kazunori Iizuka, Noriyasu Yamaki, Yuya Hisaki, Hideki Takizawa
    2015 Volume 71 Issue 6 Pages 520-526
    Published: 2015
    Released on J-STAGE: June 20, 2015
    DOIhttps://doi.org/10.6009/jjrt.2015_JSRT_71.6.520
    JOURNAL FREE ACCESS
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    Purpose: We evaluated the effect that collection angle and collection orbit condition gave to an image quantitatively by simulating the single photon emission computed tomography (SPECT) system. Method: Using the Software Package of the Nuclear Medicine Data Processor for Research, we performed making of the myocardial digital phantom, three ways of different simulation of the collection angle and collection orbit, and making of reference of the uniform picture element level. We calculated NMSE for uniformity evaluation and calculated myocardial thickness full width at half maximum (FWHM) for a spatial resolution evaluation. Results: 360 degrees circular orbit collection had best uniformity. 180 degrees noncircular orbit collection had best spatial resolution. Conclusion: By using the digital phantom, we focused on only collection angle and collection orbit condition, and focused on two indexes of the uniformity and the spatial resolution and were able to show a quantitative index.
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Clinical Technology
  • Examination of Whole Treatment Time Required for Multiple Metastatic Brain Tumors in Cobalt-60 Stereotactic Radiosurgery Procedures
    Hisato Nakazawa, Kyoko Ito, Michiyo Hirose, Masahiro Hagiwara
    2015 Volume 71 Issue 6 Pages 527-530
    Published: 2015
    Released on J-STAGE: June 20, 2015
    DOIhttps://doi.org/10.6009/jjrt.2015_JSRT_71.6.527
    JOURNAL FREE ACCESS
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    A study was conducted to clarify the time required for each treatment procedure and whole treatment time from treatment records of 124 patients with metastatic brain tumors treated by Gamma Knife (GK) Perfexion during the period from June 2013 to November 2014. GK treatment procedure is as follows: a skull frame is attached to the patient’s head, contrast-enhanced magnetic resonance (MR) imaging is acquired for treatment planning, the skull shape is provided by manual measurement, appropriate dose and dose distribution are determined for the target, irradiation is executed according to completed treatment plan, and the frame is removed after irradiation. As the results, it took 15.1±12.4 min for frame fixation, 30.1±11.5 min for MR scan, 5.0±1.0 min for skull measurement, 72.5±42.4 min for treatment planning, 91.3±56.1 min for irradiation, 99.2±60.6 min as treatment time, and 5.6±5.1 min for frame removal. In conclusion, it was shown that GK Perfexion stereotactic radiosurgery has high treatment efficiency and less burden on patients.
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Educational Lecture-Monte Carlo Simulation for Radiological Technology
Basic Lecture-Disease of the Brain: From Diagnosis to Treatment
JIRA Topics
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