著者

神谷 暸

出版者

公益社団法人 日本生体医工学会

雑誌

生体医工学 (ISSN:1347443X)

巻号頁・発行日

vol.49, no.2, pp.324-325, 2011-04-10 (Released:2011-12-14)

著者

林 達郎 周 向栄 陳 華岳 原 武史 藤田 広志 横山 龍二郎 兼松 雅之 星 博昭

出版者

公益社団法人 日本生体医工学会

雑誌

生体医工学 (ISSN:1347443X)

巻号頁・発行日

vol.46, no.4, pp.451-457, 2008-08-10 (Released:2009-01-21)

参考文献数

11

---

The number of osteoporosis patients is increasing every year in Japan. Bone mineral density (BMD), which is the helpful feature quantity in diagnosing osteoporosis, is generally measured in the central part of the vertebral body. It's possible to measure BMD at each location in X-ray CT images having a high spatial resolution. If bone mineral density of the vertebral body is not homogeneous, grasp of the lower BMD location inside the vertebral body may be helpful to clinical diagnosis. In this paper, using X-ray CT images of 80 subjects (40 male and 40 female subjects), BMDs of trabecular bones from the 12th thoracic vertebra to the 1th sacral vertebra (S1) were measured at each location. The present study showed that anterior and central locations of thoracolumbar and lumbar vertebra, and posterior, inferior, and central locations of S1 had lower BMD values. Therefore, at the thoracolumbar and lumbar vertebra, if the BMDs of anterior or central locations are selectively measured, prediction of fracture risk at vertebral bodies could be improved.

著者

神林 優太 萩原 啓

出版者

公益社団法人 日本生体医工学会

雑誌

生体医工学 (ISSN:1347443X)

巻号頁・発行日

vol.50, no.1, pp.99-104, 2012-02-10 (Released:2012-07-13)

参考文献数

24

---

Accurate assessment of the sleep cycle at home will improve self-awareness regarding the necessity of sleep for relieving fatigue. Previous studies have shown that a large number of body movements occur during light sleep compared to deep sleep. In the present study, sleep was assessed by monitoring body movements using an infrared motion sensor and Polysomnography (PSG) for a 420-min period from 00:00 to 07:00. The findings of sleep cycle based on body movements were compared with PSG findings. One cycle of sleep cycle was defined as a set of “REM, sleep level 1, 2, 3 or 4” period and subsequent “SWS, sleep level 5 or 6” period. We defined Body Movement Density (BMD) as an index of sleep cycle. BMD was a value representing the number of body movement occurrences during a 30-minutes period. The cross-correlation coefficient between BMD and sleep levels was significant in all subjects (13 males, 3 females;age, 20-23 years). In this study, a concordance rate of 76.9% (SD±24.0) between BMD cycle and sleep cycle was obtained. This study indicates the possibility of estimation for sleep cycle by using BMD without using PSG. One of the greatest advantages of BMD is that it comprises only body movement data, so measurements of breath, heart rate or brain waves are not required. Moreover, measuring BDM is both inexpensive and noninvasive.

著者

桑江 豊 三好 寿顕 関根 正樹 辻 美和 藤元 登四郎 田村 俊世

出版者

公益社団法人 日本生体医工学会

雑誌

生体医工学 (ISSN:1347443X)

巻号頁・発行日

vol.50, no.6, pp.535-542, 2012-12-10 (Released:2013-07-31)

参考文献数

17

---

This study was performed to examine the effects of weekly exercise in subjects classified as support_1 according to the Japanese health care insurance system. We evaluated the ability of eight elderly subjects to walk using wireless inertia sensors with an embedded triaxial accelerometer and angular velocity sensor. The subjects participated in training once a week and were evaluated once a month over a study period of 3 months. Wearable motion sensors were attached to the lower back and both thighs of each subject. The subjects performed high-performance walking over a distance of 10 m. The speed, cadence, gait cycle, thigh pitch angle, and autocorrelation function on the lower back were determined. The subjects attained high-performance walking sooner after 3 months. Although most of the subjects showed an improvement in walking ability, there were no significant improvements in the cadence gait cycle or autocorrelation function. Exercise once a week can significantly improve the ability of elderly subjects to walk. Thus, home exercise is recommended to improve walking ability in the elderly.

著者

中村 透 山本 松樹 佐藤 弥

出版者

公益社団法人 日本生体医工学会

雑誌

生体医工学 (ISSN:1347443X)

巻号頁・発行日

vol.48, no.2, pp.197-206, 2010-04-10 (Released:2011-01-08)

参考文献数

18

---

In this study, we investigated whether psychological states in an environment with visual stimuli can be modeled by physiological indices. As visual stimuli, films to elicit various types of emotions were presented. First, psychological ratings in response to these stimuli were investigated using semantic differential scales. Principal component analysis for the psychological ratings confirmed two primary components, which could be interpreted as the valence and arousal dimensions reported in previous studies. Then, while viewing these stimuli, psychological ratings and multiple central (electroencephalogram (EEG) and near-infrared spectroscopy (NIRS) ) and peripheral (heart rate (HR), skin potential level (SPL), respiration, thermogram, plethysmogram, and eye blinks) physiological activities were measured. Stepwise regression analyses revealed that the psychological valence could be accounted for by indices of the EEG, NIRS and HR. Psychological arousal was also explained by activities of the EEG and SPL. These results suggest that the psychological states in the visual stimulus environment could be modeled by the physiological indices.

著者

比嘉 広樹 堂上 高司

出版者

公益社団法人 日本生体医工学会

雑誌

生体医工学 (ISSN:1347443X)

巻号頁・発行日

vol.46, no.1, pp.31-36, 2008-02-10 (Released:2008-09-29)

参考文献数

8

被引用文献数

1

---

A noncontact input interface using image processing for people with disabilities of the fingers, such as rheumatism, collagen disease, and osteoarthritis, has been developed. The input interface is simply composed of a CCD camera and PC. Taken with the CCD camera, the fingers were appropriately detected using image processing in this paper. An on-screen keyboard and control box were also made. In order to evaluate a performance of the input interface, three healthy subjects input some example sentences using it. From the experimental results, it was clear that the beginners could directly input them in Microsoft Word without any difficulty, and the input characteristics with the least error were experimentally shown in this paper.

著者

田中 志信 本井 幸介 野川 雅道 山越 健弘 山越 憲一

出版者

日本生体医工学会

雑誌

生体医工学 : 日本エム・イー学会誌 = Transactions of the Japanese Society for Medical and Biological Engineering : BME (ISSN:1347443X)

巻号頁・発行日

vol.44, no.3, pp.467-474, 2006-09-10

被引用文献数

3

---

The daily monitoring of health conditions at home is a very important subject not only as an effective scheme for the early diagnosis and treatment of cardiovascular and other diseases, but also for the prevention and control of such diseases. From this point of view, we have been developing a fully automated "non-conscious" monitoring system for home healthcare. In this paper, we describe the structural details of a newly developed blood pressure (BP) measurement system built into a toilet seat and some results obtained using the system. The principle used for BP measurement was the volume-oscillometric method. A reflectance-type photop-lethysmographic sensor was installed in an appropriate position on the toilet seat, and it was automatically lifted and lowered using a newly designed helicoid-type actuator. Systolic (SBP) and mean BP (MBP) were obtained using the arterial volume pulsation signal obtained by the sensor. In order to evaluate the accuracy of the BP measurements, simultaneous measurements were carried out using two types of commercially available BP monitors (upper arm and wrist). Simultaneous measurement using an "invasive technique" via catheterization to the right brachial artery was also conducted. From the results obtained (bias [s.d.] for SBP; Upper arm: -1.20 [7.90] mmHg, Wrist: 0.44 [7.28] mmHg, Invasive: -0.41 [4.91] mmHg, bias [s.d.] for MBP; Upper arm: 4.40 [6.91] mmHg, Wrist: 5.07 [8.04] mmHg, Invasive: 3.68 [5.69] mmHg), reasonable accuracy of the present system was clearly demonstrated. This system, which requires no cumbersome procedures for BP measurement such as cuff setting, proper positioning of measuring site and so on, appears to be a useful means for long-term home healthcare monitoring.

著者

山田 憲嗣

出版者

社団法人日本生体医工学会

雑誌

生体医工学 : 日本エム・イー学会誌 (ISSN:1347443X)

巻号頁・発行日

vol.46, no.5, pp.540-541, 2008-10-10

出版者

公益社団法人 日本生体医工学会

雑誌

生体医工学 (ISSN:1347443X)

巻号頁・発行日

vol.46, no.Supplement1, pp.286-291, 2008-05-08 (Released:2011-09-05)

著者

千葉 淳 仙道 雅彦 石山 和志 荒井 賢一

出版者

社団法人日本生体医工学会

雑誌

生体医工学 : 日本エム・イー学会誌 (ISSN:1347443X)

巻号頁・発行日

vol.42, no.4, pp.313-317, 2004-12-10

被引用文献数

1

---

In this paper, the authors propose applying a magnetic actuator to a capsule endoscope. We fabricated a capsule-type magnetic actuator and investigated its moving properties in a silicone tube and in pig intestines. The device consists of a dummy capsule measuring 11 mm in diameter and 40 mm in length, a magnetic actuator composed of a permanent magnet inside the dummy capsule and a 1-mmφ spiral structure outside the capsule. The permanent magnet is magnetized in the direction of the diameter. When a rotational magnetic field is applied, the magnetic actuator rotates and moves wirelessly. In this study, we measured the effect of the spiral shape on the velocity and thrust properties. According to our experimental results using the silicone tube, the optimal actuator was formed with 4 spirals set at a spiral angle of 45 degrees. In the subsequent moving test performed in pig intestines, the actuator traveled a distance of 450 mm to its destination in the large intestine in 150 s, and a distance of 400 mm to its destination in the small intestine in 110s. This result confirms the potential applicability of the actuator as a guidance system for capsule endoscopes.

著者

大西 優貴 川北 悠介 山崎 健一 藤里 俊哉 宇戸 禎仁

出版者

社団法人日本生体医工学会

雑誌

生体医工学 : 日本エム・イー学会誌 (ISSN:1347443X)

巻号頁・発行日

vol.46, no.1, pp.64-68, 2008-02-10

被引用文献数

2

---

For application of a cultured muscle to medical engineering, both to control C2C12 myoblast differentiation and to investigate a contraction mechanism of C2C12 myotube are important. The muscle can be derived from a cultured C2C12 myoblast in an incubator. It is important to evaluate a level of C2C12 differentiation quantitatively. In this study, we propose an efficient evaluation method by cellular membrane potential measurement instead of the conventional methods that take time and are higher cost.

著者

福島 大志 西川 敦 宮崎 文夫 関野 正樹 安室 喜弘 松崎 大河 細見 晃一 齋藤 洋一

出版者

Japanese Society for Medical and Biological Engineering

雑誌

生体医工学 (ISSN:1347443X)

巻号頁・発行日

vol.49, no.1, pp.122-131, 2011

---

Repetitive Transcranial Magnetic Stimulation (rTMS) is effective for intractable diseases of the nervous system. As the effects of rTMS last only several hours, rTMS therapies need to be continued daily. Under present circumstances, it is difficult to use rTMS in patients' home, because only experienced physicians in limited hospitals can use the expensive and complicated rTMS system. Therefore, we developed a magnetic navigation system for home use of rTMS. The proposed system uses inexpensive and small magnetic sensors; hence it is suitable for home use. By using the proposed method, even people who have no medical knowledge and technique can easily navigate the coil to the optimal position preliminarily specified by expert physicians. Our system needs to collect some dataset which consists of magnetic field and the corresponding position of the coil at the patients' initial visit. Since it is bothersome to collect a large number of dataset, we reduced the dataset by approximation using multi-regression analysis.

著者

清水 佐知子 大野 ゆう子 岩佐 真也 尾島 裕子 林 剣煌 冨澤 理恵 大西 喜一郎 本杉 ふじゑ 岡田 千鶴

出版者

公益社団法人 日本生体医工学会

雑誌

生体医工学 (ISSN:1347443X)

巻号頁・発行日

vol.48, no.6, pp.536-541, 2010-12-10 (Released:2011-06-07)

参考文献数

12

被引用文献数

1

著者

田中 慶太 川勝 真喜 根本 幾

出版者

社団法人日本生体医工学会

雑誌

生体医工学 : 日本エム・イー学会誌 (ISSN:1347443X)

巻号頁・発行日

vol.44, no.4, pp.551-559, 2006-12-10

---

Magnetoencephalography (MEG) was recorded under attend and ignore conditions to detect auditory steady-state responses (ASSR) to stimuli regularly repeated 40 times/s for 2 s, and synchronization of its 40-Hz component was measured using phase coherence. The major finding of the experiment was that the increased ASSR obtained by averaging in the attend condition was due to the increased degree of synchronization as the result of stimulation during the 40-Hz activity rather than the increase in power. We made a simple differential equation model for phase dynamics and compared the change of phase coherence calculated from the model with that obtained from the measurement. The model predicted the behavior of experimental phase coherence quite well, and the estimated value of one of the two parameters in the model representing the effect of stimulus on the phase was significantly larger for the attend condition than for the ignore condition, suggesting the validity of the model.

著者

鈴木 恭宜 大下 浩二郎 垂澤 芳明 野島 俊雄 豊島 健 藤本 裕

出版者

社団法人日本生体医工学会

雑誌

生体医工学 : 日本エム・イー学会誌 (ISSN:1347443X)

巻号頁・発行日

vol.46, no.2, pp.189-201, 2008-04-10

参考文献数

23

---

This paper presents a probabilistic evaluation of electromagnetic interference caused by portable telephones in implantable cardiac pacemakers. Based on experimental results of electromagnetic interference in the 900 MHz and 1.5 GHz band PDC(Personal Digital Cellular) system in Japan, a distribution is extracted of the maximum distances between the affected pacemaker and a portable telephone. This paper shows that the distribution is approximated as a Rayleigh distribution using statistical analysis. The interfering probability for which the maximum distance of X cm is exceeded is defined based on the product of the cumulative distribution of the Rayleigh distribution and the ratio of the affected pacemaker types to the measured ones. The interfering probabilities that exceeded the maximum distance of 15 cm for the 900 MHz and 1.5 GHz band portable telephones are 5.0×10^<-4> and 6.0×10^<-4>, respectively. The expected values, which are a product of the interfering probability and the number of measured pacemaker types for the 900 MHz and 1.5 GHz band portable telephones, are 0.210 and 0.248, respectively. The continued surge in the number of pacemaker types indicates that the expected values will continue to increase. If the immunity of the new pacemaker types in the future maintains the same level as that in the present, this paper indicates that the maximum distance of the new pacemaker types must continue to be confirmed using the electromagnetic interference test.

著者

横内 光子 大野 ゆう子 笠原 聡子 沼崎 穂高 石井 豊恵

出版者

公益社団法人 日本生体医工学会

雑誌

生体医工学 (ISSN:1347443X)

巻号頁・発行日

vol.43, no.4, pp.762-768, 2005 (Released:2007-01-19)

参考文献数

16

被引用文献数

3

---

To assure security and reliability for medical services under the conditions of limited financial and human-resources, it is important to develop a quantitative method for adequate scheduling of each medical task provided by medical staff. In this paper, we developed a task classification system for medical staff from the view-point of job scheduling and applied it to actual clinical nursing time-motion study data. Based on the interview data from the three trained nurses working in a surgical ward, four scheduling points were drawn by ethnomethodological word mining ; [indispensability], [expectation], [laborforce for operation], and [time dependency]. The time-motion study data of one nurse working in a surgical ward during the daytime was analyzed from this point of view ; the nurse was in charge of five patients including one patient scheduled for surgery. The results were : (1) Almost all tasks related to major demand (e.g.,, transfer of patient to the operating room) with high indispensability and expectation, and time dependency ; (2) Required much time to complete the task (e.g., time required to transport the patient to the operating room), or were jobs with low time dependency that were selectively carried out ; (3) Required answering a nurse-call or telephone, which was classified into a task with high time dependency. In the analysis, some jobs were arranged in the order of inefficiency, contrary to the scheduling classification. The classification showed good consistency with the clinical decisions on scheduling nursing services, and the results explained well the way of scheduling nurse's duties.

著者

村上 満 田原 祐助 竹田 一則 山口 昌樹

出版者

公益社団法人 日本生体医工学会

雑誌

生体医工学 (ISSN:1347443X)

巻号頁・発行日

vol.47, no.2, pp.166-171, 2009-04-10 (Released:2009-09-09)

参考文献数

23

被引用文献数

3

---

Saliva sampling has some advantages that it is non-invasive, making multiple sampling easy and stress free. The purpose of this study is to evaluate the usefulness of salivary alpha (α) -amylase (sAA) as psychosomatic stress indexes in junior high school students. Seventy healthy (not non-attendance at school) subjects in first-year junior high school students were enrolled (12-13 yr). The sAA in the morning, daytime and early-evening were analyzed for 3 days. General Health Questionnaire (GHQ) -28 and State-Trait Anxiety Inventory (STAI) were conducted as mental health indexes, the all subjects divided two groups; high and low. High stress groups either GHQ-28 (social dysfunction) or STAI (state anxiety) showed significantly high sAA compared with those of low stress groups. The multiple regression analysis using sAA as dependent variable had applied between sAA and both mental health indexes. Although, there was no significance in low stress groups, a causal relationship was found in high stress groups. These results suggested that sAA is useful index for screening of healthy human not having especially psychosomatic stress but havingthe risk before being bad mental conditions such as a state of depression. The sAA might be a useful screening method for preventing to be a non-attendance at school.

著者

小宮 正快

出版者

社団法人日本生体医工学会

雑誌

生体医工学 : 日本エム・イー学会誌 (ISSN:1347443X)

巻号頁・発行日

vol.44, no.2, 2006-06-10

著者

佐藤 知子 小岩 研 佐川 貢一

出版者

社団法人日本生体医工学会

雑誌

生体医工学 : 日本エム・イー学会誌 (ISSN:1347443X)

巻号頁・発行日

vol.44, no.2, 2006-06-10

著者

秋元 俊成 寺田 信幸 松元 明弘

出版者

社団法人日本生体医工学会

雑誌

生体医工学 : 日本エム・イー学会誌 (ISSN:1347443X)

巻号頁・発行日

vol.46, no.1, pp.58-63, 2008-02-10

被引用文献数

1

---

We're developing walking robot with the object of bringing the walking of robot close to that of human utilizing pendular motion of legs. First, human gait analysis has been conducted in the study. In particular, we measured joint angle variation and myoelectric signal at a normal walking pace, focusing on the ankle mobility. From the result of the measurement, we realized that ankle mobility of supporting leg not only provides energy in the direction of travel by kicking back but also leads idling leg to swing forward. Then, we conducted modeling of ankle-driven walking and reproduced the motion using highly simplified model. As the result, walking driven only by ankle was realized in simulation. Therefore, it is expected that the system could not only be used for walking robot but also be applied to walking aids or artificial legs, because it reproduces a walking utilizing pendular motion of legs effectively due to the hip of free joint, and it is possible to reduce the number of actuators.