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AbstractAbstract
[en] Pheochromocytoma accounts for approximately 25% of incidentally discovered adrenal masses. Certain diagnostic procedures (e.g., adrenal arteriography, needle biopsy of an adrenal mass), anesthesia and abdominal surgery may cause a sudden release of catecholamines from a pheochromocytoma and induce paroxysmal attacks of hypertension. In addition, pheochromocytoma is well known to cause unsuspected operating room deaths. Therefore, we must carefully separate this functioning neoplasm from other types of adrenal masses. In this study, we compared the results of noninvasive tests including assay of urinary catecholamines and their metabolites, a provocative pharmacologic test using metoclopramide (MCP test), and 131I-metaiodobenzylguanidine (MlBG) scintigraphy to screen for pheochromocytoma in 10 consecutive patients with an incidentally discovered adrenal mass (6 pheochromocytomas and 4 non-functioning adrenocortical adenomas). We measured the 24-hour urinary excretion of catecholamines, metanephrines and vanillyl mandelic acid in all 10 patients; 5 were positive, 4 were negative and 1 was false-negative (sensitivity=83%, specificity=100%). The MCP test was performed in 7 patients; 3 were positive, 3 were negative and 1 was false-negative (sensitivity=75%, specificity=100%). MIBG scintigraphy was performed in 7 patients; 4 were positive, 1 was negative and 2 were false-negative (sensitivity=67%, specificity=100%). According to these results, all patients with an incidentally discovered adrenal mass should undergo a determination of the 24-hour urinary excretion of catecholamines and their metabolites, including metanephrines. If this urine assay is negative, other noninvasive tests including the MCP test and MIBG scintigraphy should be considered in selected patients with radiographic characteristics of pheochromocytoma. (author)
Primary Subject
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Journal Article
Journal
Hinyokika Kiyo; ISSN 0018-1994; ; v. 45(10); p. 677-680
Country of publication
ADRENAL HORMONES, AMINES, AROMATICS, AUTONOMIC NERVOUS SYSTEM AGENTS, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, BODY, CARDIOTONICS, CARDIOVASCULAR AGENTS, COUNTING TECHNIQUES, DAYS LIVING RADIOISOTOPES, DIAGNOSTIC TECHNIQUES, DISEASES, DRUGS, ENDOCRINE GLANDS, GLANDS, HORMONES, HYDROXY COMPOUNDS, INTERMEDIATE MASS NUCLEI, IODINE ISOTOPES, ISOTOPES, NEOPLASMS, NEUROREGULATORS, NUCLEI, ODD-EVEN NUCLEI, ORGANIC COMPOUNDS, ORGANS, PHENOLS, POLYPHENOLS, RADIOISOTOPE SCANNING, RADIOISOTOPES, SYMPATHOMIMETICS
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AbstractAbstract
[en] A novel NMR technique is described for studying the functional difference of left and right human cerebral hemispheres. The method is based on the fact that the blood flow through the brain tissues varies inhomogeneously according to their levels. 1 reference; 3 figs
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Source
Tsuchiya, Masaharu; Oda, Masaya (Keio Univ., Tokyo (Japan)); Asano, Makishige (Institute of Public Health, Tokyo (Japan)); Mishima, Yoshio (Tokyo Medical and Dental Univ. (Japan)) (eds.); International Congress Series; no. 755; 2 v. 1724 p; ISBN 0-444-80951-1; ; 1987; v. 1, p. 417-420; Excerpta Medica; Amsterdam (Netherlands); 4. World congress for microcirculation; Tokyo (Japan); 26-30 Jul 1987
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Conference
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AbstractAbstract
[en] To determine the accuracy of gadolinium-enhanced, three-dimensional, magnetic resonance angiography (3D-MRA) in the visualization of the arterial anatomy of the kidney, we compared preoperative 3D-MRA results with surgical findings in 37 patients who underwent renal surgery. 3D-MRA findings were confirmed surgically in 30 of these patients (81%). However, 4 of 7 accessory renal arteries were missed by this imaging technique. Furthermore, 3D-MRA failed to visualize renal arteries in all of the three atrophic kidneys. 3D-MRA is a safe and reliable procedure for the preoperative evaluation of renal arteries. However, the depiction of smaller renal arteries, such as accessory and atrophic arteries, is less accurate. (author)
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Journal Article
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Nishi Nippon Hinyokika; ISSN 0029-0726; ; v. 63(4); p. 237-240
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AbstractAbstract
[en] Both in post injection transmission method (PITM) and segmented attenuation correction (SAC) method are useful for clinical FDG-PET studies. The PITM, however, makes image noise bigger than conventional method because of the raw data subtraction to calculate transmission data. In this study, quantitative accuracy of PITM was evaluated in 2D and 3D FDG static images. A dedicated 3D PET scanner, GE Advance, was used to scan FDG images of phantoms, a Heart-Liver phantom (Kyoto Kagaku, type HL) and a cylindrical phantom (20 cm diameter), and human brain. Emission scans using 2D and 3D modes and transmission scan using conventional method and PITM was performed. The transmission data was processed with and without SAC method. PITM estimated the phantom activity 2% smaller than the conventional transmission method both in 2D and 3D modes. Visual inspection by nuclear medicine doctors found no change of the image qualities. In the chest imaging using both PITM and SAC method, the transmission scan time should be longer than 2 min. for its quantitative accuracy. PITM had high quantitative accuracy and clinical advantage to make total scan time shorter without deterioration of the image quality. (author)
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Journal Article
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Kaku Igaku Gijutsu; ISSN 0289-100X; ; v. 21(2); p. 51-60
Country of publication
ANTIMETABOLITES, BETA DECAY RADIOISOTOPES, BETA-PLUS DECAY RADIOISOTOPES, BODY, BRAIN, CENTRAL NERVOUS SYSTEM, COMPUTERIZED TOMOGRAPHY, DAYS LIVING RADIOISOTOPES, DIAGNOSTIC TECHNIQUES, DISEASES, DRUGS, ELECTRON CAPTURE RADIOISOTOPES, EMISSION COMPUTED TOMOGRAPHY, EVALUATION, EVEN-EVEN NUCLEI, FLUORINE ISOTOPES, GERMANIUM ISOTOPES, HOURS LIVING RADIOISOTOPES, INTERMEDIATE MASS NUCLEI, ISOMERIC TRANSITION ISOTOPES, ISOTOPES, LIGHT NUCLEI, MOCKUP, NERVOUS SYSTEM, NUCLEI, ODD-ODD NUCLEI, ORGANS, PROCESSING, RADIOISOTOPES, STRUCTURAL MODELS, TOMOGRAPHY
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Shibahara, Seiji; Takanishi, Yoichi; Yamamoto, Jun; Ogasawara, Toyokazu; Ishikawa, Ken; Yokoyama, Hiroshi; Takezoe, Hideo
Funding organisation: (United States)2001
Funding organisation: (United States)2001
AbstractAbstract
[en] Unusual softening of the layer compression modulus B has been observed near the phase boundary where the smectic-C* phase vanishes in a naphtalene-based liquid crystal mixture. From the systematic study of x-ray and layer compression measurements, this unusual effect is attributed to the pretransitional softening near a virtual smectic-A - smectic-C* phase transition in the smectic-A phase, which no longer appears on the thermoequilibrium phase diagram. This phenomenon is similar but not equivalent to supercritical behavior
Source
Othernumber: PLEEE8000063000006062701000001; 008106PRE; The American Physical Society
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Journal Article
Journal
Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics; ISSN 1063-651X; ; CODEN PLEEE8; v. 63(6); p. 062701-062701.4
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AbstractAbstract
[en] Nineteen rheumatoid patients suffering from rheumatoid spondylitis with myelopathy were surgically treated using Luque segmental spinal instrumentation (SSI). We studied 7 cases of patients who underwent postoperative magnetic resonance imaging (MRI) evaluation after being treated with titanium Luque SSI. Titanium implants were imaged safely and there was no evidence of implant migration or local tissue heating effect. MRI also allowed postoperative cervical spine imaging without significant image distortion. This titanium Luque SSI method affords rigid fixation, allows early mobilization and MRI serial imaging in the patient's lifelong medical care. (author)
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AbstractAbstract
[en] Due to the lack of official guidelines, the period of isolating patients after therapeutic dose of 131I for thyroid cancer varies among hospitals in Japan. In our institution, patients had been routinely isolated for 6 days in specified rooms for this treatment. In this study, we analysed safety standards in 131I therapy based on dosimetric data obtained in 22 patients with metastasis from differentiated thyroid cancer treated between October 1996 and April 1997. We measured 1 cm dose equivalent rate at the patient's abdomen, at 1 m from patients and background point using electronic dosimeters. We made exponential approximation using these dosimetric data hourly recorded over 6-day period. Average residual radioactivity in 22 patients was 22% at 24 hours and 6.8% at 48 hours after treatment doses. And, these data were compared with the international basic safety standards such as ICRP publication 25, NCRP 1996 and IAEA 1994. Our results suggest that only 3 days are necessary to isolate patients in the treatment rooms. (author)
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Journal Article
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Kaku Igaku Gijutsu; ISSN 0289-100X; ; v. 18(2); p. 72-78
Country of publication
ANIMALS, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, BODY, COUNTING TECHNIQUES, DAYS LIVING RADIOISOTOPES, DIAGNOSTIC TECHNIQUES, DISEASES, ENDOCRINE GLANDS, GLANDS, INTERMEDIATE MASS NUCLEI, IODINE ISOTOPES, ISOTOPES, KINETICS, MAMMALS, MAN, MEDICINE, MONITORING, NEOPLASMS, NUCLEI, ODD-EVEN NUCLEI, ORGANS, PRIMATES, RADIATION MONITORING, RADIOISOTOPE SCANNING, RADIOISOTOPES, THERAPY, VERTEBRATES
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AbstractAbstract
[en] In the measurement of a left ventricular volume, MIBI-QGS was compared with MRI. Because it became clear by the experiment using phantom that a volume calculated with QGS was smaller than the actual volume, data of clinical study were corrected. Subjects were 20 patients with coronary artery disease. Fourteen patients had anamnesis of myocardial infarct. ECG-gated SPECT was performed one hour after intravenous injection of MIBI (600 MBq) in rest. End diastolic volume (EDV), end systolic volume (ESV) and ejection fraction (EF) were calculated using QGS. Cine-MR image was obtained by using MR system of 1.5 Tesla within 1 week after SPECT. A condition was as follows; segmented k-space gradient echo with view sharing, TR=11 ms, TE=1.4 ms, flip angle 20 degree, field of view 32 cm, matrix 256 x 196, 8 lines per segment. LVEF, ESV and EF were analysed by Bland-Altman method, and the difference between MIBI-gated-SPECT and MRI was no problem. Horizontal dislocation image and vertical major axis dislocation image were provided. Minor axis crossing images of 10-12 slice were also filmed in order to cover all left ventricles. As a result, availability of MIBI-QGS became clear. Some factors which produces the measurement error are examined. (K.H.)
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Journal Article
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Eizo Joho, Medikaru; ISSN 0389-214X; ; v. 31(20); p. 1166-1170
Country of publication
ANEMIAS, BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, BODY, CARBONIC ACID DERIVATIVES, CARDIOVASCULAR DISEASES, CARDIOVASCULAR SYSTEM, COMPUTERIZED TOMOGRAPHY, DIAGNOSTIC TECHNIQUES, DISEASES, EMISSION COMPUTED TOMOGRAPHY, EVALUATION, HEART, HEMIC DISEASES, HOURS LIVING RADIOISOTOPES, INTERMEDIATE MASS NUCLEI, INTERNAL CONVERSION RADIOISOTOPES, ISOMERIC TRANSITION ISOTOPES, ISOTOPES, MOCKUP, MUSCLES, NUCLEI, ODD-EVEN NUCLEI, ORGANIC COMPOUNDS, ORGANS, PHOTOGRAPHY, RADIOISOTOPES, STRUCTURAL MODELS, SYMPTOMS, TECHNETIUM ISOTOPES, TOMOGRAPHY, YEARS LIVING RADIOISOTOPES
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AbstractAbstract
No abstract available
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103. scientific meeting of Japan Society of Medical Physics; Yokohama, Kanagawa (Japan); 12-15 Apr 2012
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Journal Article
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Conference
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Igaku Butsuri. Supplement; ISSN 1345-5362; ; v. 32(suppl.1); p. 120
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AbstractAbstract
[en] Dynamic manipulation of droplets could be achieved by light in a nematic liquid crystal (LC) doped with photochromic azobenzene derivatives. On irradiation of ultraviolet light, the trans→cis photoisomerization drives a directional motion of the droplets towards the cis-rich region and assembled close-packed two-dimensional hexagonal colloidal crystals. This behavior is mainly attributable to the reduction of the droplet-LC interfacial tension, associated with the enhanced surface activity of cis isomers. We also performed photochemical assembly of tailored droplet arrays by projection of computer-generated images on the samples. The photoinduced manipulation of droplets will provide a versatile approach to microstructuring of LC devices
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(c) 2002 American Institute of Physics.; Country of input: International Atomic Energy Agency (IAEA)
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