IEEE Engineering in Medicine and Biology Magazine
1937-4186
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Các bài báo tiêu biểu
The effects of controlled smoking on heart period variability
Tập 21 Số 4 - Trang 65-70 - 2002
This article presents a study that examined the cardiovascular effects of a single session of repetitive cigarette smoking to investigate the possible development of short-term tolerance.
#Cardiology #Blood pressure #Biomedical measurements #Spectral analysis #Hafnium #Chaos #Heart rate #Pressure control #Complexity theory #Signal analysis
MRI data compression using a 3-D discrete wavelet transform
Tập 21 Số 4 - Trang 95-103 - 2002
A low-power system that can be used to compress MRI data and for other medical applications is described. The system uses a low power 3-D DWT processor based on a centralized control unit architecture. The simulation results show the efficiency of the wavelet processor. The prototype processor consumes 0.5 W with total delay of 91.65 ns. The processor operates at a maximum frequency of 272 MHz. Th......
#Discrete wavelet transforms #Magnetic resonance imaging #Data compression #Prototypes #Medical services #Biomedical equipment #Centralized control #Medical simulation #Delay #Frequency
Investigating elastic properties of soft biological tissues
Tập 21 Số 4 - Trang 86-94 - 2002
We have developed a signal processing technique to map the axial strain distribution occurring in a medium exposed to a mechanical compression with RF ultrasound signals. This method is based on an adaptive and iterative estimation of local scaling factors, via the exploitation of phase information.
#Biological tissues #Adaptive signal processing #Biomedical signal processing #Capacitive sensors #Radio frequency #Ultrasonic imaging #RF signals #Signal processing #Iterative methods #Phase estimation
Neurovisceral integration in cardiac and emotional regulation
Tập 21 Số 4 - Trang 24-29 - 2002
The utility of heart-rate variability (HRV) to index important aspects of neural control of the heart has made it one of the most valuable tools for researchers interested in health and behavior. However, most of the literature and extant data on the central origins of HRV have been derived from animal models. As yet little is known about the central nervous system (CNS) origins and concomitants i......
#Heart rate variability #Heart rate #Central nervous system #Humans #Neurons #Back #Centralized control #Animal structures #Neuroimaging #Psychology
Characteristics and capabilities of the hyperspectral imaging microscope
Tập 21 Số 4 - Trang 104-117 - 2002
Single-pass multispectral imaging enables applications ranging from whole-chromosome painting to gene mapping. We have developed a prototype Hyperspectral Imaging Microscope (HIM) Workstation to take advantage of multispectral imaging analysis on a single pass. We trade a full specimen image on a single pass for a full emission spectrum on a single pass. The prototype HI microscope collects the vi......
#Hyperspectral imaging #Multispectral imaging #Prototypes #Optical microscopy #Painting #Health information management #Workstations #Image analysis #Software prototyping #Charge coupled devices
The effects of coronary occlusion location on the RR signal
Tập 21 Số 4 - Trang 59-64 - 2002
We carry out the study of the energy contribution of the RR signal in the three frequency bands (LF, MF, and HF) during percutaneous transluminal coronary angioplasty. Furthermore, variables based on instantaneous frequency and on group delay computed from RR signal in the three frequency bands are analyzed. All these variables are calculated by applying the Choi-Williams distribution to the RR si......
#Arteries #Delay #Heart rate variability #Signal analysis #Arterial occlusion #Time frequency analysis #Control systems #Ischemic pain #Cardiovascular system #Rhythm
Time-frequency parameters of heart-rate variability
Tập 21 Số 4 - Trang 46-58 - 2002
We have evaluated a new method to compute time-frequency parameters from cardiovascular time series. Apart from calculating the IA and the IF, characteristics of the oscillatory and irregular periods can be quantified that may be relevant to further unravel the situational- and state-dependent dynamics of homeostatic cardiovascular control processes. As a first approach, the method was applied to ......
#Time frequency analysis #Heart rate variability #Fourier transforms #Visualization #Wavelet analysis #Cardiology #Process control #Fluctuations #Resonant frequency #Signal resolution
Những lo ngại về tính hợp lệ của các chỉ số biến thiên nhịp tim thông dụng Dịch bởi AI
Tập 21 Số 4 - Trang 35-40 - 2002
Các phân tích theo miền thời gian và miền tần số của biến thiên nhịp tim (HRV) đã cung cấp cho các nhà nghiên cứu những chỉ số quan trọng về hoạt động của dây thần kinh phế vị tim. Tính ổn định có ý nghĩa lý thuyết cho các phân tích như vậy trong miền tần số nhưng có thể không có ý nghĩa thực tiễn trong bất kỳ tập dữ liệu cụ thể nào. Người ta đã lập luận rằng nếu có một bài kiểm tra tính ổn định, ......
#Heart rate variability #Heart rate #Spectral analysis #Biomedical measurements #Frequency measurement #Frequency domain analysis #Psychology #Time domain analysis #Hafnium #Time measurement
The evolution of custom microarray manufacture
Tập 21 Số 4 - Trang 123-125 - 2002
Given the enormous size of the genome and that there are potentially many other types of measurements we need to do to understand it, it has become necessary to pick and choose one's targets to measure because it is still impossible to evaluate the entire genome all at once. What has emerged is a need to have rapidly customizable microarrays. There are two dominant methods to accomplish custom mic......
#Manufacturing #Biomedical measurements #Semiconductor device manufacture #Optical arrays #Genomics #Bioinformatics #Size measurement #Ink jet printing #Biomedical optical imaging #Chemistry
Dimensional analysis of HRV in hypertrophic cardiomyopathy patients
Tập 21 Số 4 - Trang 71-78 - 2002
The HRV signals of 16 HCM patients are analyzed. Eight of them died or had a history of aborted sudden cardiac death, forming the high-risk group. The other eight patients form the low-risk group. Stationarity analysis is applied in order to avoid nonstationarities and to reject those data from further analysis. The surrogate data method is used to test nonlinear determinism on the RR series. Corr......
#Heart rate variability #Cardiology #Risk analysis #Muscles #Electrocardiography #Signal analysis #Time domain analysis #Data analysis #Rhythm #Biomedical engineering