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In this paper an EHG signal acquisition and processing system has been designed, it adopted TMS320DM6446 chip to be the master controller and a new mechanism of communication between ARM and DSP is also designed for TMS320DM6446. The EHG signal was directly collected by ADS1298 chip, after preprocessing and wavelet analysis, the signal was compared with the normal EHG signal from the pregnant women...
Many images suffer from poor contrast. It is necessary to enhance the contrast of images. Image enhancement improves an image appearance by increasing dominance of some features or by decreasing ambiguity between different regions of the image. Histogram equalization (HE) is widely used for contrast enhancement in a variety of applications due to its simple function and effectiveness. However, it...
Bioluminescence tomography (BLT) is a promising molecular imaging tool that may play an important role in preclinical research. However, the accurate and stable reconstruction of interior targets remains a challenge for wide application of this imaging modality. We present a novel reconstruction scheme to improve the BLT result by using the simplified spherical harmonics approximation model and homotopy...
In medical image processing, interactive image segmentation is an important part, because it can obtain accurate segment results with less human effort compared with manual scribing. We proposed an improved algorithm of maximal similarity based region merging, compared with the algorithm proposed in [3], our algorithm use SLIC superpixels segmentation to obtain presegmented regions, using SLIC superpixles,...
Objectives: Change the initial value of CV model to achieve the purpose of cell image segmentation fast and accurately. Material and methods: This paper selects slice image of cervical-cancer cells under a microscope as experimental materials. First, the original image is bilateral filtered and then the image is preprocessed using Otsu method to get the rough contour of cytoplasm. Then use Otsu method...
Nonnegative Matrix Factorization (NMF) has been a useful tool to solve the spectral unmixing for fluorescence imaging, which yields a set of constituent spectra, i.e., endmembers, and their corresponding fractional abundances. As observed from the spatial distribution of fluorescence data, target fluorophores are sparse and localized at certain regions while background fluorescence (including autofluorescence)...
This paper presents preliminary in vitro experimental studies in imaging of the same joint using laser-based photoacoustic imaging and microwave-based thermoacoustic imaging. In this pilot study, the experiments were conducted on the same chicken claw joint in vitro, and a delay-and-sum algorithm was used to reconstruct the two-dimensional (2D) photoacoustic and thermoacoustic images. In the future,...
Grating phase-contrast CT obtains differential phase, which is different from conventional CT (absorb-contrast CT). How to retrieve phase of object becomes a new topic. Nowadays, many algorithms have appeared to retrieve and reconstruct materials' phase information. We design a new filter to retrieve phase but not increase the dose of X-ray. The result of phase retrieved shows the validity and correctness...
Efficient assessment of vascular structures plays a significant role in many medical procedures. We present a practical approach to segmentation of vascular tree in angiography images. It is implemented in an interactive 3D visualization-assisted system and consists of the following main steps. First, angiography image is filtered to enhance vessels and eliminate irrelevant structures. Second, the...
Medical image fusion is a kind of new technology including medical image treatment and diagnosis. It can be applied to a wide variety of medical fields such as clinic diagnosis and therapy, computer assistant diagnosis, long-distance medical treatment, radiation therapy and surgery plan design, etc. Digital image fusion is a comprehensive information of the multiple source images in order to obtain...
Objective: To design and build up a computer-aided color matching system for porcelain tooth, which could offer dentists an objective suggestion for selecting the color of the patient's tooth. Methods: The color matching system is mainly based on image analyzing and processing techniques and pattern recognition methods. This system uses HSI color space to compare and calculate colors. The system consists...
In recent years, photoacoustic tomography (PAT) has caused more and more attention all over the word. As a novel medical imaging modality, it is proved to be non-invasive and high sensitivity. Photoacoustic tomography combines the advantages of both optical imaging and ultrasound imaging, which means high contrast and high resolution. According to the merits of photoacoustic tomography, in our experiments,...
Efficient and accurate segmentation of bladder wall on MR images is the most challenging part in constructing the virtual cystoscopy. Segmentation results directly affect the subsequent processing. We present an approach of segmenting the bladder wall by solving minimum-cut problem on closure graphs which was firstly used to solve open-pit mining problem. The results were obtained by optimizing the...
Objective: To evaluate the results of 99Tcm-sistamibi scintigraphy of patients with suspected primary hyperparathyroidism (PHPT). Methods: The results of 99Tcm-sistamibi scintigraphy and initial parathyroid hormone (PTH) measurement in 198 patients with suspicious PHPT were retrospectively analyzed. 198 patients with clinical suspicion of PHPT underwent 99Tcm-sistamibi scintigraphy and measured PTH...
To improve the coverage of irradiation on tumor and resolve the problem of dose shortage at the edge of tumor beside sensitive organs, we will discuss about designing divisional target plans for massive liver cancer. On the stage of designing treatment plans, we divide the Planning Target Volume (PTV) into three sub-targets: PTV1, PTV2 and PTV3. PTV1 and PTV3 are the regions for designing treatment...
The method on gene classification has been widely studied with the development of gene chip. Machine learning is the best choice to research the issue. But both traditional SVM and ELM cannot fulfill the requirement of high accuracy and short time. Therefore, in this paper, we propose a novel Accuracy Adaptive Extreme Learning Machine (A2-ELM) which can cover the shortage of traditional SVM and ELM...
Spectrum mapping reflects the strength of brain electrical activity in different frequency band. The current study analyzes changes in electroencephalography (EEG) after spinal cord injury (SCI) on the basis of spectrum mapping. Comparing spectrum mappings of SCI patients and normal subjects, the fact that beta rhythm dominated in brain electrical activity during walking period was concluded. In addition,...
A remote medical image reading and diagnosis system based on cloud services is designed and implemented in this paper, using the WEB browser and DICOM WEB server with Web Access to DICOM Persistent Objects for data exchange. Infrastructure, platform, and software are provided as services through Internet, which is the main concept of cloud services. Based on cloud services, the system is capable of...
The identification method based on biometric identification technology application of previous research mainly on external characteristics such as fingerprint, face, but in recent years the appearing of fake fingerprints technology makes people information security be badly affected. This paper proposed an identity recognition method based on the power spectral analysis of pulse wave signal from finger...
During radiotherapy, tumors in thorax or abdomen may deviate from the beam because of the physiological or physical influence, such as breathing. Extracorporeal marker is an important substitution to locate the tumors affected by respiratory motion. In this paper, a multi-camera vision system is proposed to track the extracorporeal marker on the model which can simulate respiratory motion. By acquiring...
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