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There is a novel method for creating a 2-d parameterized finite element model of the human femur with matching artificial hip joint based on X-ray image before the hip joint replacement surgery. It can help us to evaluate the selected appropriate hip joint prosthesis
This paper describes a method to extract the vascular centerlines and contours in coronary angiography. The proposed approach associates geometric moments for the estimation of a "cylinder-like model" and relies on a tracking process. The orientation of the cylinder axis and its local diameter are computed from the analytical expressions of the geometric moments of up to order 2. Experimental...
The article presents a concept of balance among image points based on the correlation of points and then develops a new binarization method for gray scale image, which can be used in vessel extraction of DSA images. A point is in balance only when its resistance counteracts the influence from the neighborhood, while noise breaks down such balance. By restoring the balance of every single point, the...
X-ray phase contrast imaging method is able to show microstructure inside soft tissues with weak absorption in a radiograph mode. X-ray phase contrast CT is being under study. We propose a multi-criterion optimization approach to reconstruct the object from phase contrast images. Our reconstructed results show that the method can differentiate boundary of microstructure of fly very clearly. Comparison...
In this paper, we present a new method for X-ray angiogram images enhancement using a contrast-modulated nonlinear diffusion. The original nonlinear diffusion is gradient driven, which leads into much dependence on the accurate estimation of the edge. However, it is very difficult to get the accurate estimation of edges for X-ray angiogram images, which are characterized with complex background. So...
In this paper, we present a reconfigurable system-on-chip architecture targeted mainly to medical imaging applications. By combining general purpose processors and FPGA-based hardware, and integrating the whole system into a single FPGA chip, we were able to build a compact system without sacrificing processing power and flexibility. A prototype board based on the proposed architecture was built and...
Clinical X-ray imaging has always been based on the biological tissue's differences in X-ray attenuation ever since Roentgen discovered X-ray over 100 years ago. However X-ray-tissue interaction causes X-ray phase changes as well. We have identified the four clinically important factors that affect the X-ray phase visibility in clinical imaging. These factors are: body part attenuation, the spatial...
Considerable attention has been focused on digital X-ray systems with transmission. However, only a few attempts have been made using X-ray backscatter system. It has difficulty that we have to reconstruct image from a little data in the image processing. Especially, it is necessary that the method correct error of detector effectively. That is the most important thing in the acquisition of X-ray...
Image registration has been widely used for generating more diagnostic and clinical values in medical imaging. On the other hand, inaccurate image registration and incorrect localization of region of interest risks a potential impact on patients. Vibro-acoustography (VA) is a new imaging modality that has been applied to both medical and industrial imaging. Combining unique diagnostic information...
Flat panel detectors have a large number of parameters that affect fluoroscopy image quality. Scintillator thickness is very important and can be readily changed in fabrication. With increasing thickness, there is a degradation of MTF with spatial blurring but improved conversion efficiency. This design trade-off should be optimized for visualization. Using quantitative experimental and techniques,...
We present a novel method for rapid removal of patient scatter from cone beam (CB) projection images that requires no scatter measurement, physical modeling or strong assumptions regarding the spatial smoothness of the scatter distribution. A modulator grid is placed between the imaged distribution and the detector that differentially frequency modulates primary and scattered photons. When photons...
For appropriate diagnosis, medical image such as high quality image of patient's affected part and vital signal, patient information, and teleconferencing data for communication between specialists will be transmitted. After connecting patient and specialist the center, sender acquires patient data and transmits to the center through TCP/IP protocol. Data that is transmitted to center is retransmitted...
A new approach of registration in multimodal imaging has been developed. Modalities involved are digital subtracted angiography (DSA, 2D) and magnetic resonance angiography (MRA, 3D). Our approach is an hybrid one, mixing feature and intensity based approaches. This approach is based on the extraction of a anatomical referential common to both MRA and DSA. The results obtained prove the methods efficiency...
Measurement of intervertebral movements is essential in the assessment and diagnosis of patient's instability. However, diagnosis of the underlying causes remains problematic despite of extensive study. Reasons for this arise from the variability of detecting vertebral body landmarks, labor and time-consuming of manual point placement, incompletely description of the vertebral body shape and also...
Image registration is one of the image processing methods which is widely used in computer vision, pattern recognition, and medical imaging. In digital subtraction radiography, image registration is one of the important prerequisites to match the reference and subsequent images. In this paper, we propose an automatic non-rigid registration method namely curvature-based registration that relies on...
Osteoporosis is characterized by an abnormal loss of bone mineral content, which leads to a tendency to nontraumatic bone fractures or to structural deformations of bone. Thus bone density measurement has been considered as a most reliable method to assess bone fracture risk due to osteoporosis. In past decades bone texture measures have been also studied in connection with the bone quality estimation...
This paper proposes a novel method of reconstruction of vessel axis on the matching of iterative projection algorithm and analyzing of corresponding points. The 3-D space is divided into several cubes. The cubes are projected in the actual projection directions separately. If a cube-projection includes vessel axis points, it is believed that the cube includes 3-D vessel. Then we divide the cube into...
Economic considerations make the conventional chest radiograph (X-ray) film an important ingredient in the diagnostic process. An initial clinical investigation for patients with suspected lung ailments is the study of the chest X-rays. The problem of detection for diseases in their early stages are well known using X-ray. A technique involving wavelets coefficient as the feature vector and Andrew's...
Breast cancer is the most common type of cancer in women worldwide. About ten percent of women are confronted with breast cancer in their lives. Breast cancer can be most efficiently treated if detected at an early sage. Imaging of the breast can be accomplished using several modalities such as: X-ray, MRI, CT, ultrasound, and now molecular imaging. Image registration plays a critical role in breast...
In this paper, a fast lossless compression scheme is presented for the medical image . This scheme consists of two stages. In the first stage, a differential pulse code modulation (DPCM) is used to decorrelate the raw image data, therefore increasing the compressibility of the medical image. In the second stage, an effective scheme based on the Huffman coding method is developed to encode the residual...
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