-
Article type: Cover
2004 Volume 60 Issue 3 Pages
Cover12-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Cover
2004 Volume 60 Issue 3 Pages
Cover13-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Bibliography
2004 Volume 60 Issue 3 Pages
Misc1-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Index
2004 Volume 60 Issue 3 Pages
Toc11-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Index
2004 Volume 60 Issue 3 Pages
Toc12-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
2004 Volume 60 Issue 3 Pages
I-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2004 Volume 60 Issue 3 Pages
II-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2004 Volume 60 Issue 3 Pages
III-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2004 Volume 60 Issue 3 Pages
III-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2004 Volume 60 Issue 3 Pages
III-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2004 Volume 60 Issue 3 Pages
IV-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2004 Volume 60 Issue 3 Pages
V-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2004 Volume 60 Issue 3 Pages
V-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2004 Volume 60 Issue 3 Pages
VI-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Shigehiko Katsuragawa
Article type: Article
2004 Volume 60 Issue 3 Pages
309-316
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Shinji Kadomaru
Article type: Article
2004 Volume 60 Issue 3 Pages
317-326
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
TAKESHI MURAKAMI
Article type: Article
2004 Volume 60 Issue 3 Pages
327-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
KEIZO MURAKAMI
Article type: Article
2004 Volume 60 Issue 3 Pages
328-331
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
KEI KIKUCHI
Article type: Article
2004 Volume 60 Issue 3 Pages
331-337
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
SHU IKEDA
Article type: Article
2004 Volume 60 Issue 3 Pages
337-341
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
NOBUKAZU TAKAHASHI
Article type: Article
2004 Volume 60 Issue 3 Pages
341-345
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
SHIGENORI MARU
Article type: Article
2004 Volume 60 Issue 3 Pages
345-349
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
NOBUYUKI KIURA
Article type: Article
2004 Volume 60 Issue 3 Pages
350-356
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
YOSHIHARU HIGASHIDE
Article type: Article
2004 Volume 60 Issue 3 Pages
357-361
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
HIROKO NISHIDE
Article type: Article
2004 Volume 60 Issue 3 Pages
362-367
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
2004 Volume 60 Issue 3 Pages
368-377
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
CHUDO KAZUSA
Article type: Article
2004 Volume 60 Issue 3 Pages
378-385
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
AI YOSHIDA, KYOKO SAITO, YOSHIMUNE ENDO, KAZUAKI MORI, MISAYO SEKI, HI ...
Article type: Article
2004 Volume 60 Issue 3 Pages
387-392
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
The thyroid uptake of ^<123>I and ^<131>I is generally measured by a gamma camera system. We evaluated the error in determining thyroid uptake caused by different methods of calculation among four gamma camera systems with various collimators. We first designed an original thyroid phantom that consisted of the thyroid and a body containing various levels of radioiodine activity. The applications for thyroid uptake equipped in two gamma camera systems performed calculations by the automatic method with background counts not subtracted from the capsule counts. When the size of the rectangular region of interest (ROI) for the capsule was set at 10×8 cm (a typical ROI size for the thyroid), percentages of thyroid uptake as calculated by the manual method with background counts subtracted from the capsule counts and thyroid counts were 52% to 57% when the value was set at 55% for ^<123>I; and 54.2% and 58.7%, respectively, when the value was set at 60% for ^<131>I. On the other hand, the percentages of thyroid uptake calculated by the automatic method with the application using two gamma camera systems with non-subtraction of background counts from the capsule counts were 46% and 50.5% when the value was set at 55%; and 49.6% when the value was set at 60%. The values calculated by the automatic method were underestimated as a result of background counts that were not subtracted from the capsule counts. When ROI size for the capsule was set at 4×4 cm, which is slightly larger than the capsule size, even thyroid uptake as determined by the automatic method using the application showed a difference of less 2% from the set values. There was no difference in thyroid uptake among the various kinds of collimators, high-resolution collimators. all-purpose collimators. and a suitable collimator for gamma-ray energy of ^<123>I.
View full abstract
-
HAJIME SAITO, KEIGO OKABE, YASUO NAKAZAWA
Article type: Article
2004 Volume 60 Issue 3 Pages
393-398
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
Fluoroscopy-guided intervention of the lumbar spine, such as nerve block, plays an important role in the management of disc hernia patients. However, irradiation of operators' fingers remains a problem even with careful collimation and operation, especially when performed by non-radiologists. We compared the irradiation doses of under-table and over-table fluoroscopy systems, and we discuss the most advantageous method of reducing irradiation. The effectiveness and conditions of use of lead protection gloves were also evaluated. Skin dose was monitored using polymethyl methacrylate (PMMA) and an electronic dose meter. The skin doses of over- and under-table fluoroscopy were compared using C-arm fluoroscopy. Finger irradiation dose with 0.03 mmPb protection gloves was also measured. The under-table method reduced skin dose by 95 % compared with the over-table method. Thicker PMMA resulted in a higher rate of irradiation reduction. Protection gloves reduced radiation dose by half, although this reduction was cancelled when automatic brightness control (ABC) was utilized. Under-tube fluoroscopy was superior to over-tube fluoroscopy in reducing irradiation to the fingers.
View full abstract
-
TADAMITSU IDEGUCHI, YOSHIHARU HIGASHIDA, KAZUHIKO HIMURO, MASAFUMI OHK ...
Article type: Article
2004 Volume 60 Issue 3 Pages
399-405
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
The physical characteristics of a clinical amorphous silicon-based flat-panel imager for full-field digital mammography were investigated. Pre-sampled modulation transfer functions (MTF) were measured by using a slit method. Noise power spectra were determined for different input exposures by fast Fourier transform. The MTFs of fullfield digital mammography systems showed significantly higher values than those of the computed radiography (CR) system. The full-field digital mammography system showed a lower noise level than that of the CR system under the same exposure conditions. Contrast detail analysis has been performed to compare the detectability of the full-field digital mammography system with that of the screen-film (Min-R 2000/Min-R 2000) system. The average contrast-detail curves of digital and film images were obtained from the results of observation. Image quality figures (IQF) were also calculated from the individual observer performance tests. The results indicated that the digital contrast-detail curves and IQF, on average, are superior to those of the screen-film system.
View full abstract
-
YASUSHI YAMAMOTO, MASUO HARAMOTO, AKIO KOMATSU, KOUJI UCHIDA
Article type: Article
2004 Volume 60 Issue 3 Pages
406-414
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
The effects of image reconstruction conditions and devices used on 3D-SSP analysis (Z-score mapping) were investigated. Images of the 3D Hoffman brain phantom were taken with the IRIX device or E.CAM. Using two methods of image reconstruction (FBP and OSEM), several kinds of phantom normal databases (PNDB)and signal data, with or without correction for attenuation, were obtained at varying Butterworth filter cutoff frequencies. The results of 3D-SSP analyses were compared between combinations of PNDB and signal data obtained under the same conditions of image reconstruction and combinations obtained under different conditions. The results of PNDB obtained with different devices were also analyzed. For combinations of PNDB and signal data both obtained with OSEM, the Z-score of signals was high. When FBP was used to obtain both PNDB and signal data, the Z-score and signal size tended to become greater and the false-positive rate tended to decrease as the Butterworth filter cutoff frequency became lower. Whether or not correction for attenuation was incorporated did not affect the results of analysis when the same method was used to collect both PNDB and signal data. If the method for image reconstruction differed between PNDB and signal data, the false-positive rate was relatively high. Using a different device to obtain PNDB resulted in a relatively high false-positive rate. We therefore recommend that the conditions for image reconstruction from signal data should be matched to the conditions for image reconstruction from PNDB. It seems impossible to share the same NDB among different devices.
View full abstract
-
MASATO MAENO
Article type: Article
2004 Volume 60 Issue 3 Pages
415-422
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
This study used functional magnetic resonance imaging (fMRI) for brain function evaluation. fMRI data were collected by a block paradigm, and brain function was evaluated. In the block paradigm, the BOLD effect causes a several-second delay in hemodynamics, and analytical processing is done in consideration of this time lag. However, irrelevant artifacts caused by the BOLD effect frequently occur in analytical processing. Therefore, there is a limit to obtaining a sufficient activating reaction in the analytical system, which is normally equipped with MRI. Thus, obtaining the activating reaction is limited because the corresponding misregistration correction, angle correction, time series correction, and so on, are insufficient in an analytical system equipped with MRI. It has become standard to use analytical systems such as SPM. We examined the mean curve of the activating part and the area of artifact. As a result, it was possible to identify the activating signal and the artifact signal, and it became possible to obtain an adequate response from a system that is normally equipped with an activating signal in which artifacts are few.
View full abstract
-
KAZUAKI TERASAWA, ATSUSHI HATCHO
Article type: Article
2004 Volume 60 Issue 3 Pages
423-428
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
In three-dimensional CT angiography (3DCTA) studies, we make it a rule to use a CT number monitoring system (SureStart, Toshiba Medical Systems Company) to ensure that contrast-enhanced images are acquired at the optimal timing. However, although SureStart can accurately determine enhancement start timing, it is still possible to inject more contrast medium than necessary because the scan start time is not known with certainty. To address this problem, we conducted investigations to determine the ideal contrast examination technique using SureStart and an injector synchronization system. Our results showed that a CT number of 300 HU in the middle cerebral artery (M1) could be obtained with the injection of contrast medium for a period of 45 s (450 mgI/kg)for the head or for 50 s (450 mgI/kg)for the craniocervical region. This makes it possible to perform contrast studies with greater reproducibility by taking individual variation into consideration. Moreover, it was found that comparable results could be obtained by terminating the injection of contrast medium 15s before the completion of the study and immediately injecting a physiological saline solution flush, permitting the volume of contrast medium to be further reduced.
View full abstract
-
ATSUKO SHIOMOTO, HIROYUKI AKAZAWA, TAKASHI OKADA, SHINSUKE YANO, NATSU ...
Article type: Article
2004 Volume 60 Issue 3 Pages
429-436
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
In radiation therapy for keloid, electron beams are delivered to the skin through a lead shield hollowed into the shape of the keloid. The shape of a postoperative keloid scar is linear, causing the irradiation shield to be long and narrow. This lead shield is put on the surface of the skin. Therefore, it is considered that beam data used in general external irradiation are not applicable to irradiation for keloid. Therefore, we used a water equivalent phantom and measured beam data by using chambers or film dosimeters. Experimental conditions were the same as those of actual radiotherapy for keloid. As a result of this procedure, the radiation technique was optimized. Electron energy and thickness of the bolus, thickness of the lead shield, margins such that the planning target volume would receive the necessary dose, and the method of MU calculation all were determined. It was suggested that these experiments were useful to establish the appropriate technique in irradiation for keloid.
View full abstract
-
Article type: Appendix
2004 Volume 60 Issue 3 Pages
437-438
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2004 Volume 60 Issue 3 Pages
439-442
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2004 Volume 60 Issue 3 Pages
443-446
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2004 Volume 60 Issue 3 Pages
447-448
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
RESTRICTED ACCESS
To protect personal information, PDF files cannot be viewed.
View full abstract
-
Article type: Appendix
2004 Volume 60 Issue 3 Pages
449-450
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2004 Volume 60 Issue 3 Pages
451-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2004 Volume 60 Issue 3 Pages
452-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2004 Volume 60 Issue 3 Pages
453-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2004 Volume 60 Issue 3 Pages
453-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2004 Volume 60 Issue 3 Pages
App12-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2004 Volume 60 Issue 3 Pages
App13-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2004 Volume 60 Issue 3 Pages
App14-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2004 Volume 60 Issue 3 Pages
App15-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2004 Volume 60 Issue 3 Pages
App16-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
Article type: Appendix
2004 Volume 60 Issue 3 Pages
1-
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS
-
[in Japanese]
Article type: Article
2004 Volume 60 Issue 3 Pages
2-4
Published: March 20, 2004
Released on J-STAGE: June 30, 2017
JOURNAL
FREE ACCESS