Japanese Journal of Radiological Technology

Online ISSN : 1881-4883
Print ISSN : 0369-4305
ISSN-L : 0369-4305

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Volume 56, Issue 12

Displaying 1-42 of 42 articles from this issue

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[title in Japanese]

Article type: Cover
2000 Volume 56 Issue 12 Pages Cover10-
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110906

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[title in Japanese]

Article type: Index
2000 Volume 56 Issue 12 Pages Toc7-
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110907

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[title in Japanese]

Article type: Index
2000 Volume 56 Issue 12 Pages Toc8-
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110908

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[title in Japanese]

[in Japanese]

Article type: Article
2000 Volume 56 Issue 12 Pages I-
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110909

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[title in Japanese]

Article type: Appendix
2000 Volume 56 Issue 12 Pages II-
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110910

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[title in Japanese]

Article type: Appendix
2000 Volume 56 Issue 12 Pages III-
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110911

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[title in Japanese]

Article type: Appendix
2000 Volume 56 Issue 12 Pages III-
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110912

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[title in Japanese]

Article type: Appendix
2000 Volume 56 Issue 12 Pages IV-
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110913

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[title in Japanese]

Article type: Appendix
2000 Volume 56 Issue 12 Pages IV-
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110914

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[title in Japanese]

Article type: Appendix
2000 Volume 56 Issue 12 Pages V-
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110915

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[title in Japanese]

Article type: Appendix
2000 Volume 56 Issue 12 Pages V-
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110916

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[title in Japanese]

Article type: Appendix
2000 Volume 56 Issue 12 Pages VI-
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110917

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[title in Japanese]

Article type: Appendix
2000 Volume 56 Issue 12 Pages VII-X
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110918

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[title in Japanese]

Article type: Appendix
2000 Volume 56 Issue 12 Pages XI-
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110919

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[title in Japanese]

Article type: Appendix
2000 Volume 56 Issue 12 Pages XI-
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110920

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[title in Japanese]

Article type: Appendix
2000 Volume 56 Issue 12 Pages XII-XIV
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110921

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What is Multi-slice CT?

KAZUHIRO KATADA

Article type: Article
2000 Volume 56 Issue 12 Pages i-
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110922

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At the Beginning of the Special lssue of Multi-slice CT

KOZO HANAI, [in Japanese], [in Japanese]

Article type: Article
2000 Volume 56 Issue 12 Pages ii-
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110923

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Principles of Multi-slice CT

KATSUMI TSUJIOKA

Article type: Article
2000 Volume 56 Issue 12 Pages 1391-1396
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110924

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[title in Japanese]

YASUYUKI MORISHITA

Article type: Article
2000 Volume 56 Issue 12 Pages 1397-1400
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110925

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Quantum leap in technology, GE MDCT LightSpeed

MASAYUKI KUDO

Article type: Article
2000 Volume 56 Issue 12 Pages 1401-1405
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110926

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Multi-slice CT from Simens : SOMATOM Volume Zoom

KATSUTOSHI MURATA

Article type: Article
2000 Volume 56 Issue 12 Pages 1406-1410
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110927

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Present Situation of the Multi-slice CT User

YOSHIHIRO IDA

Article type: Article
2000 Volume 56 Issue 12 Pages 1411-1415
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110928

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Present Situation of the Multi-slice CT User

MINORU ISHIFURO

Article type: Article
2000 Volume 56 Issue 12 Pages 1416-1424
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110929

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Recent Progress of Dosage by Monte Carlo Method

AKIRA ITO

Article type: Article
2000 Volume 56 Issue 12 Pages 1425-1428
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110930

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Introduction of " THE NUCLEAR MEDICINE HANDBOOK FOE ACHIEVING COMPLIANCE WITH NRC REGULATIONS" : Mainly on disposal of solid radioactive waste

MASAMICHI YANAGISAWA, [in Japanese]

Article type: Article
2000 Volume 56 Issue 12 Pages 1429-1433
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110931

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[title in Japanese]

Fumio MURAKAMI

Article type: Appendix
2000 Volume 56 Issue 12 Pages 1434-1436
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110932

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Measurements of Patient Chest Dose for Multi-slice X-ray CT Examinations Using PIN Photodiode Dosimeters

TAKAHIKO AOYAMA, SHUJI KOYAMA, NORIHIKO NARITA, SHIGEKI ITOH, MASATAKA ...

Article type: Article
2000 Volume 56 Issue 12 Pages 1437-1446
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110933

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Organ and tissue doses delivered during chest CT examinations were measured as a function of scanning parameters including tube current, slice thickness, and pitch of the multi-slice CT scanner. Measurements were carried out by using a chest dosimetry phantom that incorporated lung and vertebra models, and by putting PIN photodiode dosimeters into the phantom at sites of the esophagus or stomach, lung, bone marrow, and skin. Absorbed doses at each site in the phantom measured for a constant scan area indicated that these values could be precisely calculated from the value obtained at any scanning parameter by using inverse proportionality of dose to pitch and the data of x-ray intensity as a function of tube current and slice thickness measured for the CT scanner used. Relative dose at each site was found to be constant regardless of the scanning parameters, indicating that the dose value at each site could be calculated from that measured at only one point in the phantom. Effective doses and effective dose equivalents were estimated from organ or tissue doses for chest CT examinations, and were found to be 1.5 to 3 times larger than the average values of effective dose equivalents appearing in the literature.

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Evaluation of Physical Characteristics in Multi-slice CT

SHUJI YAMAMOTO, TAKESHI JOHKOH, TAKASHI MATSUMOTO, SHOHZOH NAKANISHI, ...

Article type: Article
2000 Volume 56 Issue 12 Pages 1447-1453
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110934

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This paper describes the results of a quality-of-image evaluation in multi-slice CT equipment. Image noise, section sensitivity profile (SSP), and spatial resolution of axial plane images were determined using two types of multi-slice CT equipment (Hispeed Advantage QX/I:GE-YMS Co. Ltd.; Aquilion: Toshiba Co. Ltd.). Suggestion: Based on theoretical considerations image noise was increased for helical pitch. Spatial resolution in the axial plane has been improved in the frequency domain by quarter-quarter offset reconstruction. Although slice thickness changed with helical pitch, as compared with a single CT, the profile has been improved notably. The limits of thin stratification of beam collimation and SSP evaluation by the bead method (point spread function using a small tungsten ball)were examined experimentally.

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Basic Examination of Section Sensitivity Profile on Z-axis and Image Noise in Multi-slice CT Using Asymmetric-type Detector

TAKANORI HARA, HIDEKI KATO, CHIKARA AOKI, YOSHIYUKI MATSUBARA, YOSHIHI ...

Article type: Article
2000 Volume 56 Issue 12 Pages 1454-1460
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110935

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Our goal in this study was to analyze the relationship between the shape of the non-spiral scan sensitivity profile on the Z-axis (SSPz) and the shape of spiral scan SSPz and image noise of spiral pitch with an asymmetric-type detector in multi-slice CT. In the first experiment, we used a bead phantom of 0.1 mm in diameter with non-spiral SSPz and spiral SSPz. Measuring non-spiral SSPz, we moved the bead phantom by manual control and measured the effect of partitions on each slice collimation, the full width at half maximum (FWHM), and the full width at tenth maximum (FWTH). When we experienced spiral scan, we measured FWHM and FWTM at various pitches and collimations. In the subsequent experiments, we used a water phantom of 200 mm in diameter to image noise. We measured the standard deviation (SD) of the CT number at the center of the water phantom at various pitches and collimations. The results of non-spiral SSPz showed that partitions had an effect on the shape of SSPz. On the other hand, at the same collimation, the results of spiral SSPz showed that spiral pitches had no effect on FWHM. However, spiral pitches had a slight effect on FWTM and the base of SSPz. The results of image-noise showed that, if the same collimation was used, spiral pitches had little effect on SD because of tube current control. Thus our results were different from the those obtained with a matrix-type detector in multi-slice CT.

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Concept and Development of Measurement Method of Time Sensitivity profile (TSP) in X-ray CT : Comparison of Non-helical, Single-slice Helical, and Multi-slice Helical Scans

KATSUMI TSUJIOKA, YOSHIHIRO IDA, HIRONORI OHTSUBO, YASUKATA TAKAHASHI, ...

Article type: Article
2000 Volume 56 Issue 12 Pages 1461-1469
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110936

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We focused on the time element contained in a single CT image, and devised the concept of a time-sensitivity profile (TSP) describing how the time element is translated into an image. We calculated the data collection time range when the helical pitch is changed in non helical scans, single slice helical scans, and multi slice helical scans. We then calculated the time sensitivity profile (TSP) from the weighting applied when the data collection time range is translated into an image. TSP was also measured for each scanning method using our self-made moving phantom. TSPs obtained from the calculation and the experiments were very close. TSP showed interesting characteristics with each scanning method, especially in the case of multi slice helical scanning, in which TSP became shorter as helical pitch increased. We referred to the TSP's FWHM as the effective scanning time. When we conducted multi slice helical scanning at helical pitch 3, the effective scanning time increased to about 24% longer than that of a non helical scan. When we conducted multi slice helical scanning at helical pitch 5 or 6, the effective scanning time was about half that of a non helical scan. The time sensitivity profile (TSP) is a totally new concept that we consider an important element in discussing the time resolution of a CT scanner. The results of this review will provide significant data in determining the scanning parameters when scanning a moving object.

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Construction of a Multi-slice CT Image Storage Transmission System with Real-time Three-dimensional Imaging

SHUJI YAMAMOTO, HIDEAKI YOSHIMURA, TAKASHI MATSUMOTO, SHOHZOH NAKANISH ...

Article type: Article
2000 Volume 56 Issue 12 Pages 1470-1475
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110937

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A CT image storage transmission system for two main multi-slice CT units (Aquilion: Toshiba Co. Ltd.; Hispeed Advantage QX/I: GE-YMS Co. Ltd.) was built and it tried to add further a real-time three-dimensional imaging and its image analysis, and a processing system of a network. One image storage server is installed in one multi-slice CT unit, with on-line management between each server, and it carried backup and DICOM network print function at the time of computer error. Moreover, measurement of the volume of the three-dimensional image adapting a share and the Intranet of an on-line PC system etc., added on the network the research support system for three-dimensional, and practical use of CT image databases, such as RJS-PACS, also performed it filrther. The employment of this system of real-time three-dimensional imaging in Osaka University has been useful not only for image storage but also for research and educational support.

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The Comparison of 4 Detector-row (4DCT) and Standard 1 Detector-row (SDCT) Scanners : CT Bronchoscopy Image Quality and Detectability of Bronchus

MINORU ISHIFURO, YUJI AKIYAMA, TOSHIO KUSHIMA, MASAYUKI KUDO

Article type: Article
2000 Volume 56 Issue 12 Pages 1476-1484
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110938

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With the spread of helical CT, three-dimensional CT (3DCT) has been employed in routine clinical settings for examination of the respiratory system. Virtual bronchoscopy (VB) is used in the simulation of bronchoscopy to observe protruded lesions. It is also utilized for the purpose of obtaining informed consent from patients. However, the currently used single detector CT (SDCT) creates a limited-range three-dimensional model of the airways owing to difficulty in breath holding. For this reason, VB that derives from insufficient volume data is sometimes incapable of demonstrating the airways. However, the advent of multi-detector CT (MDCT) has made it possible to visualize a wider extent of the airway by using thin slices. This study was thus undertaken to assess the ability of VB to visualize the tracheobronchial tree under an imaging condition that allowed a single breath-holding period (within 30 seconds) in SDCT and MDCT.

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[title in Japanese]

Article type: Appendix
2000 Volume 56 Issue 12 Pages 1485-1487
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110939

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[title in Japanese]

Article type: Appendix
2000 Volume 56 Issue 12 Pages 1488-
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110940

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[title in Japanese]

Article type: Appendix
2000 Volume 56 Issue 12 Pages 1489-1490
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110941

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[title in Japanese]

Article type: Appendix
2000 Volume 56 Issue 12 Pages 1491-1492
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110942

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[title in Japanese]

Article type: Appendix
2000 Volume 56 Issue 12 Pages 1493-1498
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110943

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Article type: Appendix
2000 Volume 56 Issue 12 Pages 1499-1500
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110944

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[title in Japanese]

Article type: Index
2000 Volume 56 Issue 12 Pages 1501-1513
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110945

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[title in Japanese]

Article type: Appendix
2000 Volume 56 Issue 12 Pages 1514-1515
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110946

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[title in Japanese]

Article type: Cover
2000 Volume 56 Issue 12 Pages Cover11-
Published: December 20, 2000
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003110947

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