Japanese Journal of Radiological Technology

[title in Japanese]

Article type: Cover
1996 Volume 52 Issue 4 Pages Cover19-
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354260

JOURNAL FREE ACCESS

Download PDF (3578K)
[title in Japanese]

Article type: Cover
1996 Volume 52 Issue 4 Pages Cover20-
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354261

JOURNAL FREE ACCESS

Download PDF (3578K)
[title in Japanese]

Article type: Index
1996 Volume 52 Issue 4 Pages Toc13-
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354262

JOURNAL FREE ACCESS

Download PDF (60K)
[title in Japanese]

Article type: Index
1996 Volume 52 Issue 4 Pages Toc14-
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354264

JOURNAL FREE ACCESS

Download PDF (55K)
[title in Japanese]

[in Japanese]

Article type: Article
1996 Volume 52 Issue 4 Pages I-
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354265

JOURNAL FREE ACCESS

Download PDF (176K)
[title in Japanese]

Article type: Appendix
1996 Volume 52 Issue 4 Pages II-IV
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354266

JOURNAL FREE ACCESS

Download PDF (197K)
[title in Japanese]

Article type: Appendix
1996 Volume 52 Issue 4 Pages V-
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354267

JOURNAL FREE ACCESS

Download PDF (69K)
[title in Japanese]

Article type: Appendix
1996 Volume 52 Issue 4 Pages VI-
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354268

JOURNAL FREE ACCESS

Download PDF (44K)
[title in Japanese]

Article type: Appendix
1996 Volume 52 Issue 4 Pages VII-
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354269

JOURNAL FREE ACCESS

Download PDF (35K)
[title in Japanese]

Article type: Appendix
1996 Volume 52 Issue 4 Pages VII-
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354270

JOURNAL FREE ACCESS

Download PDF (35K)
A Study of Relative Fluorescences and Relative Speeds of Radiographic Screens

HIROOMI SUMIDA, AKIYOSHI OHTSUKA, KENICHI YOSHIDA, YOSHIHARU HIGASHIDA ...

Article type: Article
1996 Volume 52 Issue 4 Pages 505-510
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354271

JOURNAL FREE ACCESS

Show abstractHide abstract

At present, about fifty kinds of screens are prepared in Japan. However, there are no any good speed indices for these screens, and measurements of relative speeds are difficult. We studied relationship of relative fluorescence and relative speeds of screens. There is a close relationship between fluorescence and screen speeds except for the screens with different fluorescent material. Results show that relative fluorescence can be used as speed indices of screens and structure of screens can be analyzed by measuring fluorescence and x-ray attenuation rates of screens.

View full abstract

Download PDF (820K)
The Examination of Pulmonary CT Image that the Breathed Air Volume Influence over the CT Values

TSUKASA DOI, YOSHIMASA MIZUNO

Article type: Article
1996 Volume 52 Issue 4 Pages 511-517
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354272

JOURNAL FREE ACCESS

Show abstractHide abstract

When the chest CT examination is preformed, an observation is made that the posterior side of the lung often appears higher density than the anterior side. Various explanations, from disease, physiological phenomenon, etc. are hypothesized, and examinations are conducted to determine the cause. In a normal lung, the breathed air is gradually filled from the top (relative to gravity) to the bottom, and physiologically, there is a noticeable difference in the CT values. When a deep breath is taken, air fills the whole pulmonary field, and CT values for the top and the bottom of the lung become equal. However, if a patiant has inflammation or other disease which restricts the breathed air volume to below normal, a CT value difference is observed. Therefore, the conclusion is reached that the posterior side of the normal pulmonary field having high density is caused by the subject breathing a below normal amount of air, and the pulmonary alveolar wall appearing high density.

View full abstract

Download PDF (2132K)
The Relationship between the Contrast Ratio and Low Frequency Drop of the Image Intensifier

KEIICHI SAITO, FUMIYASU TAMAGAWA

Article type: Article
1996 Volume 52 Issue 4 Pages 518-523
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354273

JOURNAL FREE ACCESS

Show abstractHide abstract

The relationship between the drop at low frequency of the MTF and contrast ratio of the x-ray image intensifier is evaluated. The three samples have the different contrast ratios. It is shown as the function of Pb disc diameter. That relationship is called the disc transfer function (DTF). The DTF can be expressed by two exponential parts. By this it is shown that the flare of the part of the small Pb disc diameter corresponds to the LFD, and the short range effects is especially related to the LFD. Therefore, it is able to be expressed by the simple equation of the relationship between the contrast ratio and the LFD of the XRII. The LFD evaluation which is the difficult measurement can take place the contrast ratio evaluation by several Pb disc diameter which is a simple measurement.

View full abstract

Download PDF (750K)
Physical Imaging Properties of A New Screen-film System for Chest Radiography

YOSHIHARU HIGASHIDA, AKIRA YOSHIDA, NOBORU KATSUDA, NOBUYUKI MORIBE, Y ...

Article type: Article
1996 Volume 52 Issue 4 Pages 524-529
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354274

JOURNAL FREE ACCESS

Show abstractHide abstract

To evaluate the clinical usefulness of a new screen-film system (advanced screen-film system ; AD system) for chest radiography, its fundamental imaging properties were investigated. The basic imaging properties were evaluated by measuring characteristic (H&D) curves, relative speeds, MTFs (modulation transfer functions), WS (Wiener spectra), and x-ray attenuation of screens. The film gradient of the AD system was slightly lower at low radiographic density, and higher at high density. The screen speed of the AD system was 112% greater than that of the conventional system, and the film speed was 47% lower. As the result, the total speed of the AD system was slightly higher compared with the conventional system. Resolution property of the AD system was comparable to or slightly lower than that of the conventional system. However, the noise level of the AD system was considerably lower than that of the conventional system at low and middle photographic density levels. X-ray attenuation of the HG-M screens was about 10% higher than that of the conventional screens. We conclude that the AD system has superior imaging properties than the conventional system.

View full abstract

Download PDF (1064K)
Study of Imaging Parameters for Gd-DTPA Continuous Intravenous Injection 3D MR Angiography, Using Fast Gradient Echo

JOJI KATO, YOSHIHIKO KAWAMURA, KOICHIRO ITO

Article type: Article
1996 Volume 52 Issue 4 Pages 530-535
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354275

JOURNAL FREE ACCESS

Show abstractHide abstract

Gd-DTPA Continuous Intravenous Injection 3D MRA (imaging while Gd-DTPA intravenous injecting) is a method for obtaining angiograms by dint of T_1-shortening effect. For this procedure, high concentration of intravascular Gd-DTPA and alleviation of artifacts associated with the imaging effect on extra-vascular tissues are important, for which shortening of the imaging time is hoped for. The conventional gradient echo method, however, had a limit in shortening of the imaging time. Then, in this study, Fast gradient echo method, a higher-speed gradient echo method was examined for its optimal imaging parameters. Combined use of FATSAT, out of phase TE and FA at about 30-50 degrees with Fast SPGR made it possible not only to suppress fat signal, but also to shorten the imaging time, thereby to keep a high concentration of intravascular Gd-DTPA and to outline such an angiogram as is excellent in contrast.

View full abstract

Download PDF (1199K)
Influence from Bony Structures, Fatty Tissues and Air Areas of Ultrasonic Pulses in Human Model

OSAMU NAKAMURA, NAGAYOSHI MORITA, KIYOSHI OKAZAKI

Article type: Article
1996 Volume 52 Issue 4 Pages 536-542
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354276

JOURNAL FREE ACCESS

Show abstractHide abstract

We have analyzed so far, by using the finite-difference time-domain method, the propagation and scattering in the human body model of weak converging ultrasonic pulses which are utilized in echo trigger pulse systems equipped with extracoporeal shock wave lithotripter, and have investigated, on the basis of this analysis, the operational property of the echo trigger pulse system. In this paper, we analyze the scattering and reflection of weak converging ultrasonic pulses by a reanl calculus in the focal region, and bony structures, fatty tissues and air areas near around pulse propagation paths to investigate the effect of the existence of those obstacle areas on the operation of trigger pulse system.

View full abstract

Download PDF (1109K)
Development of Management Instrument of Automatic Exposure Control in Cineradiographic System

MASAKI KUDO, KENJI USHIBANA, TAKASHI NAKAMURA, HIROSHI INATSU, HIROFUM ...

Article type: Article
1996 Volume 52 Issue 4 Pages 543-548
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354277

JOURNAL FREE ACCESS

Show abstractHide abstract

An instrument for management and adjustment of automatic exposure control unit in cineradiography was developed. In this instrument, test radiography with film is not needed since the quantity of relative input light intensity to cine camera is measured with photodiode directly. The instrument is provided with the following properties : 1)The relationship between the iris diameter and the quantity of relative input light intensity measured by the instrument is linear from three to ten and becomes saturated at thirteen. 2)The quantity of relative input light intensity and the photographic density change when density setting value point changes. 3)The quantity of relative input light intensity was approximately fixed, and had no relationship to x-ray tube voltage, tube carrent and exposure pulse time, provided x-ray intensity which is incident on the image intensifier was fixed 4)The quantity of relative input light intensity doesn't change even if the image intensifier size is changed. 5)The quantity of relative input light intensity increases when frame number is increased. The possible cause is in the integrating circuit of the instrument. However, this does not limit the use if the frame number is fixed during measurements. Accordingly, management and adjustment of automatic exposure control unit are completed more simply by using this instrument.

View full abstract

Download PDF (1577K)
Total Body Irradiation with 6MVX-rays : Absorbed Dose Distribution in A Humanoid Phantom

KOZO KUMAGAI

Article type: Article
1996 Volume 52 Issue 4 Pages 549-555
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354278

JOURNAL FREE ACCESS

Show abstractHide abstract

Dose distribution in a humanoid phantom irradiated with total body irradiation of long SAD techniques by 6MV x-rays are discussed. Absorbed dose are measured by x-ray films or TLDs set in slice of the phntom. Uniformity of dose distribution is compared among the results of irradiations by anterior-posterior opposing two beams, lateral opposing two beams, and these combination (four beams). In the cases of lateral opposing two beams irradiation, irradiation is done with and without water boluses at head and neck region. In the case of four beams (anterior-posterior and bilateral), the uniformity is best among the three irradiation techniques, and the uniformity is within±10%. In the case of anterior posterior opposing two beams irradiation, the uniformity is rather good, but exceeds±10%. Lateral opposing two beam irradiation results the worst uniformity. But an application of boluses shows improvent of uniformity of midline of a humanoid phantom. In thoracicregion, as lung is irradiated over high absorbed dose, lung compensator is sufficiently nesessary for dose homogeneous and dose reduction.

View full abstract

Download PDF (902K)
Recent Advances in Ultrasound and Its Perspective

YUJI HORIGUCHI, HIROSHI KUBO

Article type: Article
1996 Volume 52 Issue 4 Pages 556-561
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354279

JOURNAL FREE ACCESS

Download PDF (2073K)
Does SPECT beyond PET?

Yasuaki Shoji

Article type: Article
1996 Volume 52 Issue 4 Pages 562-563
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354280

JOURNAL FREE ACCESS

Download PDF (325K)
On the Instrumentation and Image Reconstruction

Koichi Ogawa

Article type: Article
1996 Volume 52 Issue 4 Pages 563-568
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354281

JOURNAL FREE ACCESS

Show abstractHide abstract

Attenuation and scatter of gamma rays decrease the accuracy of reconstructed images. For the attenuation correction, the conventional methods which assume the attenuation coefficient in the cross section to be uniform generate artifacts and yield insufficient images in quantity of reconstructed SPECT value. Thus, the recent gamma camera systems can measure true attenuation coefficient using external gamma ray sources. For the scatter correction, the recent methods which consider the distribution of Compton scattered photons yield sufficient elimination of scattered photons compared with conventional methods. In this paper, we describe the causes of the attenuation and scattering, conventional correction methods and their limitations, and recent correction methods.

View full abstract

Download PDF (882K)
Problems Involved in Quantitative Measurement with PET

Keiichi Oda

Article type: Article
1996 Volume 52 Issue 4 Pages 568-572
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354282

JOURNAL FREE ACCESS

Show abstractHide abstract

To acquire a quantitative images with positron emission tomography (PET), corrections for count loss, attenuation and scatter, must be given. The methods for performance evaluation of those corrections were published by European Economic Community (EEC), National Electrical Manufactures Association (NEMA), Japan Radioisotope Association (JRIA) and Japan Industries Association of Radiation Apparatus (JIRA). Now an international standard of performance evaluation is under discussion by International Electrotechical Commission (IEC). Those standards differ with one another in their item list and the method of evaluation adopted in each item. As for quantity of PET, a lot of research publications have recently appeared on the correction of attenuation and scatter as well as partial volume effect.

View full abstract

Download PDF (713K)
Problems in Measurement of Cerebral Blood Flow by SPECT

Shinichi Yanagimoto

Article type: Article
1996 Volume 52 Issue 4 Pages 573-578
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354283

JOURNAL FREE ACCESS

Show abstractHide abstract

Recently, measurement of cerebral blood flow have been widely performed using some cerebral perfusion imaging tracers and various methods. These methods are depend on the suitability of the tracer kinetics model for the measurements and quantitativity of SPECT values. The values of cerebral blood flow contains some errors of the measurements and the physicians have some difficulties in assessment of the value in clinical situations. It is important that we should adequately appreciate the values of cerebral blood flow derived from the methods.

View full abstract

Download PDF (1007K)
Problem of PET in Cerebral Blood Flow Measurement

Masaharu Amano

Article type: Article
1996 Volume 52 Issue 4 Pages 578-581
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354284

JOURNAL FREE ACCESS

Show abstractHide abstract

Steady state method with C^<15>O_2 or autoradiography (ARG) method with H_2^<15>O is generally adopted to measure cerebral blood flow by PET. Though each method has merits and demerits, ARG method is reported here because of its advantages in acquisition time and precision. As sensitivity and artery blood sampling is important among the problems of ARG method, it is described here. It becomes difficult to acquire adequate count by data acquisition of 1〜2 minutes, because axial high resolusion result in very low sensitivity per slice in recent PET. 3D data acquisition and coincidense bundling is to resolve the problem of the low-sensitivity. Artery blood sampling causes painful measurement and less efficiency. One of the resolution of the problem is Dual-PET that can acquire both brain and heart data simultaneously.

View full abstract

Download PDF (637K)
Quantification of Cerebral Blood Flow by Means of PET and SPECT

Jun Hatazawa, Yasuaki Shoji, Takenori Hachiya, Yasuo Aizawa

Article type: Article
1996 Volume 52 Issue 4 Pages 581-584
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354285

JOURNAL FREE ACCESS

Show abstractHide abstract

Measuring regional cerebral blood flow in stroke patients significantly contributes to reveal pathophysiology of cerebral circulation and its disturbance. Positron emission tomographic measurement is accurate but still has limitation for clinical use. Improvement of single photon emission tomography measurement such as scatter and attenuation correction facilitates its clinical use.

View full abstract

Download PDF (750K)
Lately Progress Report of the Medical Information System for Radiological Section

MAKOTO KURANISHI, [in Japanese], [in Japanese], [in Japanese], [in Jap ...

Article type: Article
1996 Volume 52 Issue 4 Pages 585-599
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354286

JOURNAL FREE ACCESS

Download PDF (1931K)
[title in Japanese]

Article type: Appendix
1996 Volume 52 Issue 4 Pages 600-601
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354287

JOURNAL FREE ACCESS

Download PDF (163K)
[title in Japanese]

[in Japanese]

Article type: Article
1996 Volume 52 Issue 4 Pages 602-
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354288

JOURNAL FREE ACCESS

Download PDF (186K)
[title in Japanese]

[in Japanese]

Article type: Article
1996 Volume 52 Issue 4 Pages 602-
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354289

JOURNAL FREE ACCESS

Download PDF (186K)
[title in Japanese]

[in Japanese]

Article type: Article
1996 Volume 52 Issue 4 Pages 603-
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354290

JOURNAL FREE ACCESS

Download PDF (210K)
[title in Japanese]

[in Japanese]

Article type: Article
1996 Volume 52 Issue 4 Pages 603-
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354291

JOURNAL FREE ACCESS

Download PDF (210K)
[title in Japanese]

[in Japanese]

Article type: Article
1996 Volume 52 Issue 4 Pages 604-
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354292

JOURNAL FREE ACCESS

Download PDF (208K)
[title in Japanese]

[in Japanese]

Article type: Article
1996 Volume 52 Issue 4 Pages 604-605
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354293

JOURNAL FREE ACCESS

Download PDF (407K)
[title in Japanese]

[in Japanese]

Article type: Article
1996 Volume 52 Issue 4 Pages 605-
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354294

JOURNAL FREE ACCESS

Download PDF (250K)
[title in Japanese]

[in Japanese]

Article type: Article
1996 Volume 52 Issue 4 Pages 606-
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354295

JOURNAL FREE ACCESS

Download PDF (186K)
[title in Japanese]

[in Japanese]

Article type: Article
1996 Volume 52 Issue 4 Pages 606-
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354296

JOURNAL FREE ACCESS

Download PDF (186K)
[title in Japanese]

[in Japanese]

Article type: Article
1996 Volume 52 Issue 4 Pages 606-
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354297

JOURNAL FREE ACCESS

Download PDF (186K)
[title in Japanese]

Article type: Appendix
1996 Volume 52 Issue 4 Pages 607-
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354298

JOURNAL FREE ACCESS

Download PDF (31K)
[title in Japanese]

Article type: Appendix
1996 Volume 52 Issue 4 Pages 608-615
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354299

JOURNAL FREE ACCESS

Download PDF (891K)
[title in Japanese]

Article type: Appendix
1996 Volume 52 Issue 4 Pages 616-
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354300

JOURNAL FREE ACCESS

Download PDF (33K)
[title in Japanese]

Article type: Appendix
1996 Volume 52 Issue 4 Pages 617-635
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354301

JOURNAL FREE ACCESS

Download PDF (1836K)
[title in Japanese]

Article type: Appendix
1996 Volume 52 Issue 4 Pages 636-637
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354302

JOURNAL FREE ACCESS

Download PDF (129K)
[title in Japanese]

Article type: Appendix
1996 Volume 52 Issue 4 Pages 638-
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354303

JOURNAL FREE ACCESS

Download PDF (64K)
[title in Japanese]

Article type: Cover
1996 Volume 52 Issue 4 Pages Cover21-
Published: April 20, 1996
Released on J-STAGE: June 29, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00001354304

JOURNAL FREE ACCESS

Download PDF (420K)

Register with J-STAGE for free!