Japanese Journal of Radiological Technology

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

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Volume 61, Issue 2

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[title in Japanese]

Article type: Cover
2005 Volume 61 Issue 2 Pages Cover9-
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326632

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[title in Japanese]

Article type: Index
2005 Volume 61 Issue 2 Pages Toc9-
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326633

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[title in Japanese]

Article type: Index
2005 Volume 61 Issue 2 Pages Toc10-
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326634

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[title in Japanese]

[in Japanese]

Article type: Article
2005 Volume 61 Issue 2 Pages I-
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326635

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 2-5
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326636

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 6-
Published: February 20, 2005
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DOIhttps://doi.org/10.6009/jjrt.KJ00003326637

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages App10-
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326638

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 145-
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326639

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 145-
Published: February 20, 2005
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DOIhttps://doi.org/10.6009/jjrt.KJ00003326640

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 146-149
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326641

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 150-
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326642

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 151-
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326643

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 152-153
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326644

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 154-155
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326645

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 156-157
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326646

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 158-159
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326647

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 160-163
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326648

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 164-169
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326649

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 170-171
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326650

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 172-173
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326651

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 174-192
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326652

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 193-
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326653

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages App11-
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326654

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 195-205
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326655

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 206-211
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326656

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 212-238
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326657

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Umeda Laboratory, Kitasato University(Report of Research Group)

MASAYUKI SHIMOSEGAWA

Article type: Article
2005 Volume 61 Issue 2 Pages 239-241
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326658

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 242-
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326659

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 243-
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326660

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 244-
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326661

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Application of Phase Contrast Imaging to Mammography

KEIKO TOHYAMA, TETSURO KATAFUCHI, SATORU MATSUO, JUNJI MORISHITA, KATS ...

Article type: Article
2005 Volume 61 Issue 2 Pages 245-252
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326662

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Phase contrast images were obtained experimentally by using a customized mammography unit with a nominal focal spot size of 100μm and variable source-to-image distances of up to 1.5m. The purpose of this study was to examine the applicability and potential usefulness of phase contrast imaging for mammography. A mammography phantom (ACR156 RMI phantom) was imaged, and its visibility was examined. The optical density of the phantom images was adjusted to approximately 1.3 for both the contact and phase contrast images. Forty-one observers (18 medical doctors and 23 radiological technologists) participated in visual evaluation of the images. Results showed that, in comparison with the images of contact mammography, the phantom images of phase contrast imaging demonstrated statistically significantly superior visibility for fibers, clustered micro-calcifications, and masses. Therefore, phase contrast imaging obtained by using the customized mammography unit would be useful for improving diagnostic accuracy in mammography.

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Examination of Phantom Scatter Factors in Irregular Fields with Enhanced Dynamic Wedge

TOMOHARU SATO, TOSHIHIRO ISHIDA, MIWA SASAKI, TSUGIO OOTSUKA

Article type: Article
2005 Volume 61 Issue 2 Pages 253-259
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326663

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Use of an enhanced dynamic wedge (EDW) changes the size of the irradiation field in real time because of the shift of the flexible aperture during irradiation. Therefore, when EDW is used, it is speculated that the scatter factors proposed by Khan et al. may differ from that obtained in an open irradiation field. The aim of the present study was to investigate whether the total scatter factors (S_<cp>) can also be separated into the collimator scatter factors (S_c) and phantom scatter factors (S_p) when using EDW, and whether S_p in an irregular irradiation field using EDW and one without the use of EDW can likewise be handled. Results indicated that the values of S_<cp> and S_c in a square or rectangular irradiation field using EDW tended to differ from those in an open irradiation field, whereas S_p was almost the same, with a slight variation of about 0.5%, indicating that S_<cp> could be separated into S_c and S_p. However, for an irregular irradiation field, the variations in S_p exceeded 1% in some cases irrespective of the use or non-use of EDW. Depending on the size and geometry of the irradiation field, it was within the range of the degree of uncertainty of 2.5% in the evaluation of output radiation dosage, which was described in AAPM Report 13. Therefore, the theory proposed by Khan et al. was found to be valid also for an irregular irradiation field using EDW, which could be handled in the same manner as in the irregular irradiation field without using EDW.

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Method for Determining Scan Timing Based on Analysis of Formation Process of the Time-density Curve

ISAO YAMAGUCHI, TOMOKAZU ISHIDA, EIJI KIDOYA, KYOJI HIGASHIMURA, MASAY ...

Article type: Article
2005 Volume 61 Issue 2 Pages 260-267
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326664

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A strict determination of scan timing is needed for dynamic multi-phase scanning and 3D-CT angiography (3D-CTA) by multi-detector row CT (MDCT). In the present study, contrast media arrival time (T_<AR>) was measured in the abdominal aorta at the bifurcation of the celiac artery for confirmation of circulatory differences in patients. In addition, we analyzed the process of formation of the time-density curve (TDC) and examined factors that affect the time to peak aortic enhancement (T_<PA>). Mean T_<AR> was 15.57±3.75 s. TDCs were plotted for each duration of injection. The rising portions of TDCs were superimposed on one another. TDCs with longer injection durations were piled up upon one another. Rise angle was approximately constant in response to each flow rate. Rise time (T_R) showed a good correlation with injection duration (T_<ID>). T_R was 1.01T_<ID> (R^2=0.994) in the phantom study and 0.94T_<ID>-0.60 (R^2=0.988) in the clinical study. In conclusion, for the selection of optimal scan timing it is useful to determine T_R at a given point and to determine the time from T_<AR>.

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Improvement in the Performance of the Adaptive Neighborhood Contrast Enhancement Technique Based on Entropy

REINA CHIBA, YONGBUM LEE, DU YIH TSAI

Article type: Article
2005 Volume 61 Issue 2 Pages 268-276
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326665

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This paper presents an improved adaptive-neighborhood-contrast-enhancement (ANCE) method for the improvement of medical image quality. The ANCE method consists of computing the local contrast around each pixel using a variable neighborhood whose size depends on the statistical properties around the given pixel. The obtained contrast image is then transformed into a new contrast image using a contrast enhancement function. Finally, a contrast-enhanced image is obtained by applying inverse contrast transform to the previous step. This technique provides the advantages of enhancing or preserving image contrast while suppressing noise. However, it does have a drawback. The performance of the ANCE method largely depends on how to determine the parameters used in the processing steps. The present study proposes a novel method for optimal and automatic determination of several parameters using entropy. To quantitatively compare the performance of the proposed method with that of the ANCE method, computer-simulated images are generated. The output-to-input SNR level and the mean squared error are used as comparison criteria. Results demonstrated the superiority of the proposed method. Moreover, we have applied our new algorithm to echocardiograms and mammograms. Our results showed that the proposed method has the potential to become useful for improving the image quality of medical images.

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Fundamental Study of Coronary Angiography Using Gadolinium Contrast Agent

TAKAAKI KITAI, MASAHIRO SAITO, TAKESI OGAWA, JUN NOGUTI, SADAHIKO SANO ...

Article type: Article
2005 Volume 61 Issue 2 Pages 277-284
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326666

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To investigate the clinical usefulness of coronary arteriography using a gadolinium contrast medium (hereinafter referred to as Gd contrast medium) in patients with iodine allergy, images obtained using an iodinated contrast medium and a Gd contrast medium were compared using respective phantoms. Within the range of the effective energy (34.8 to 41.0 keV) in clinical use, the tube-voltage dependency of the Gd contrast medium was lower than that of the iodinated contrast medium. The contrast ratios were found to be comparable for the images obtained by a 4-fold-diluted iodinated contrast medium and the undiluted Gd contrast medium. Although the assessment of stenotic ratio was difficult to obtain by visual evaluation of the clinical images, due to unclear borders of the blood vessels, the presence or absence of significant stenosis was discriminative by arteriography using the Gd contrast medium. Based on these findings, it was considered necessary to make a confirmed diagnosis using a Gd contrast medium with concurrent diagnosis by intravascular echography. In conclusion, coronary arteriography and PCI using a Gd contrast medium are considered to offer benefit to the diagnosis and treatment of patients with iodine allergy.

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Experience in IVR Performed Using a Posture Support Device Designed Especially for a Patient Unable to Take the Decubitus Position

TAKAO ICHIDA, MINORU HOSOGAI, TAKAYOSHI OGAWA, EIJI YAMADA, MASACHIKA ...

Article type: Article
2005 Volume 61 Issue 2 Pages 285-290
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326667

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We were requested to perform IVR for uterine artery embolotherapy of a patient who was unable to take the decubitus position. Because of extreme overweight, the patient was limited to a sitting posture on a bed in the living environment. Therefore, a device to support her sitting posture on the IVR patient table was designed and created. The support device was used to hold the patient's body in a half-sitting posture and distribute her weight load appropriately so that the weight load applied to the patient's body could be minimized. Using this support device, IVR could be performed smoothly during a period of 2 hours 40 minutes.

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Visualization of the Lower Cranial Nerves by 3D-FIESTA

YUSUKE OKUMURA, MASAYUKI SUZUKI, AKIHIRO TAKEMURA, HIDEO TSUJII, KAZUH ...

Article type: Article
2005 Volume 61 Issue 2 Pages 291-297
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326668

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MR cisternography has been introduced for use in neuroradiology. This method is capable of visualizing tiny structures such as blood vessels and cranial nerves in the cerebrospinal fluid (CSF) space because of its superior contrast resolution. The cranial nerves and small vessels are shown as structures of low intensity surrounded by marked hyperintensity of the CSF. In the present study, we evaluated visualization of the lower cranial nerves (glossopharyngeal, vagus, and accessory) by the three-dimensional fast imaging employing steady-state acquisition (3D-FIESTA) sequence and multiplanar reformation (MPR) technique. The subjects were 8 men and 3 women, ranging in age from 21 to 76 years (average, 54 yeas). We examined the visualization of a total of 66 nerves in 11 subjects by 3D-FIESTA. The results were classified into four categories ranging from good visualization to non-visualization. In all cases, all glossopharyngeal and vagus nerves were identified to some extent, while accessory nerves were visualized either partially or entirely in only 16 cases. The total visualization rate was about 91%. In conclusion, 3D-FIESTA may be a useful method for visualization of the lower cranial nerves.

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 298-299
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326669

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 302-
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326670

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 303-
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326671

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 303-
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326672

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages 304-
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326673

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages App12-
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326674

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[title in Japanese]

Article type: Appendix
2005 Volume 61 Issue 2 Pages App13-
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326675

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[title in Japanese]

Article type: Cover
2005 Volume 61 Issue 2 Pages Cover10-
Published: February 20, 2005
Released on J-STAGE: June 30, 2017

DOIhttps://doi.org/10.6009/jjrt.KJ00003326676

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