[Content-based medical image retrieval].

At first, the concept of medical image retrieval based on contents is here illustrated. Then, features of medical image are analyzed. Among them, gray histogram method, texture method, shape method are discussed, and the compression method is emphasized. Finally, the challenges in medical image retrieval are presented before us in the paper.

[The design of ultrasound subsystem in PACS/HIS environment].

Playing an important role in PACS, ultrasound subsystem together with CT and X-radiography subsystems works as the image Provider and image processing center. In this paper, we propose a novel scheme on how to construct ultrasound subsystem and explain it with detailed work flow and software frame. We also give a discussion on how to expand such a subsystem.

[The late achievements of volume CT].

This paper mainly introduces the late achievements of theories and methods for this technology. And we look into the future of them at the end of this paper. The main contents include direct volume CT and its fast algorithms, volume imaging for non-complete data, direct volume CT based on digital radiography and reverse geometry X-ray.

[PACS-based endoscope image acquisition workstation].

A practical PACS-based Endoscope Image Acquisition Workstation is here introduced. By a Multimedia Video Card, the endoscope video is digitized and captured dynamically or statically into computer. This workstation realizes a variety of functions such as the endoscope video's acquisition and display, as well as the editing, processing, managing, storage, printing, communication of related information. Together with other medical image workstation, it can make up the image sources of PACS for hospitals. In addition, it can also act as an independent endoscopy diagnostic system.

[System design and implementation of a distributed PACS].

It is inevitable for our country to take the concept of informationized hospital in order to improve diagnosis quality and reduce administrative overhead. However we can not follow the way that has been taken in developed countries because of the national conditions of China. So we have to take some effective strategies to implement our high performance PACS. Based on our concrete experience gained from the development of a PACS in Shanghai, this paper presents a distributed architecture of PACS and describes the design detail of several PACS core components.

[The development of a new version of multifunctional radioactive nuclide diagnostic instrument].

A new kind of multifunctional radioactive nuclide diagnostic instrument is described here, which can make noninvasive measurements on the metabolic functions of five most important inner organs which are kidney, liver, heart and thyroid. The design of the hardware and software of the new instrument embodies many advanced advantages such as multifunctional integration, high accuracy and high reliability, computer controlled, automatic data-processing, easy to use and manage, and so on. Applications show that this is an advanced and efficient radioactive medical diagnostic instrument.

Liver CT-image retrieval based on Gabor texture.

Gabor schemes of image representation have shown great success in many texture related computer vision applications. This is mainly because the primitives of image representation in vision have a wavelet form similar to Gabor elementary functions (GEF's). We use Gabor approach to analyze the texture of liver CT-images and extract the corresponding feature vectors. Then, the feature vectors are used to facilitate content-based image retrieval (CBIR). In experiments, a batch of liver CT images containing several types of CT findings is collected, and retrieval results by Gabor texture are present.