In recent years, with the rapid development of industrial technology, computer technology and medical technology, CT equipment technology is also developing rapidly. The world's major medical imaging equipment manufacturers have launched their latest, highest-end CT equipment and new clinical Application technology has greatly promoted the development of medical imaging diagnosis and treatment technology and the improvement of the overall medical level. At the 2007 RSNA in Chicago, USA, the United States GE company, Germany's Siemens company, have the latest and highest-grade CT equipment exhibited, and now the performance and technical characteristics of each CT product are introduced as follows.

The so-called gem CT is a smart CT technology that uses gemstones as detector materials. Due to the special physical properties of gemstones, not only the image quality has been greatly improved, but also a new field of energy application has been developed. The creative design of gemstone CT has achieved breakthroughs in clinical and scientific research.

In terms of hardware, the core technology of the image chain has been comprehensively improved on GE's new generation of gemstone intelligent CT technology. 1. Detector technology: Gemstone CT uses a gem material with stable molecular structure. It weighs more than 2,400 carats. Its outstanding characteristics are: 1 material has the fastest response to X-ray: initial speed (visible light conversion) is accelerated 150 times, emptying The speed (afterglow effect) is 10 times faster and is also the hardware foundation for instantaneous dual-energy acquisition. 2The gemstone has high purity, strong permeability and high photoelectric conversion rate; 3 gem material has high hardness and stability; the response speed of gem material reaches 0.02ms, which is 150 times that of conventional materials; the revolution of detector material science brings high definition The era of CT scanners makes us see more, see more clearly, and lower doses

Dynamic zoom tube: Traditional tube is usually two sizes of focus, large focus is used to scan high mA images, small focus is used to scan low mA images, but clinical needs are diverse, sometimes we need to use small focus Scan high mA images, or for different image layer thicknesses, scan fields, select different focus, and make the tube life longer, a new generation of unique dynamic zoom tube solves this problem well. It is possible to dynamically change the focus of the tube, rather than a fixed focus, so that the system can automatically select the matching focus size according to different conditions, which will bring better image quality to the clinic. At the same time, GE chose a more durable filament material. By focusing and deflecting the electromagnetic field, the desired focus is obtained, making the tube more durable and longer lasting. 3. Data acquisition system: The sampling rate of the CT680's DAS system is 3 times higher than before, and the acquisition speed reaches 7028views/sec, which is the highest in the industry. At the same time, the power consumption is reduced by half, the electronic noise is smaller, and the signal transmission is better. 4. High-voltage generator: The high-voltage generator of HDCT680 is different from the traditional one. It can perform instantaneous switching of energy with a period of 0.5 milliseconds, which corresponds to the fast response performance of the gemstone detector, so that the application of energy enters the clinical practice stage.

In terms of clinical aspects, the advantages of gemstone CT are also fully reflected. The gemstone CT750 brings together the best of CT in the world, and concentrates their advantages on a CT750. It also has its own unique advantages. 1. Spectral Grid: CT's study of energy has experienced changes in single-energy, dual-energy, multi-energy, and energy spectrum grids. On GE's gem CT, the energy spectrum grating can obtain images of single-energy spectra for clinical identification such as Coronary plaque properties, pleural fluid properties, stone components, quantitative analysis of masses, etc. open up a wide range of potential value, can also eradicate hardening artifacts caused by metal, contrast agents, etc. It is currently the only cardiac and coronary energy spectrum analysis The HD CT scanner is also the most advanced energy imaging device. 2. High-definition images: The primary breakthrough for gemstone CT is the high-resolution image that can reach the MR-like image quality. For more than 10 years, the image quality of CT has not been greatly improved, and the image is the most basic and core problem in clinical practice. Gemstone CT can greatly improve the spatial resolution and low-density resolution of CT. Entering the high-definition era, it provides an effective tool for clinically improving the diagnosis rate and differential diagnosis and discovering earlier lesions. 3. Dynamic 500-row: Dynamic 4D functional imaging with coverage beyond the detector width limit. Gem CT is a clinically developed functional diagnosis. It can observe the physiological functions under dynamic conditions, the nature and physiological characteristics of the lesions, and the coverage can reach the range of 500 rows of CT, which expands the scope of clinical function research. 4. Fully automatic processing flow: The new post-processing process completely liberates the doctor's hands. This process can realize 2D and 3D reconstruction automatically after scanning, saving doctors a lot of reconstruction time, and “finishing the eyes” to solve the user. The worries of the day have achieved a qualitative leap in optimizing the workflow.

In RSNA 2005, Siemens Medical Systems Group released the SOMATOM Definition system, the world's first dual-source CT (DSCT) system. The DSCT changed the conventional CT imaging system for an X-ray tube and a detector. The linear tube system and two detector systems to capture CT images, this simple and creative design breaks through the limitations of current conventional CT, greatly improving the time resolution, regardless of the patient's own condition and heart rate, the system can Perform unprecedented quality inspections. In addition, through dual-energy acquisition of 3D printing technology, that is, two X-ray sources work with different energy settings, DSCT expands the unprecedented clinical application prospects in improving tissue resolution.

DSCT technology enables a large number of emergency patient examinations with one fastest scan and provides superior diagnostic image quality. With a total energy of 160 kW, the two X-ray sources ensure excellent image quality even at the fastest scanning and bed-in speeds. With a scanning aperture of 78 cm and a scanning range of 200 cm, the OMATOM Definition enables full-body scanning even in patients with high obesity, whereas the scanning range of conventional single-source CT scans is limited in this case. This is especially important when clinically requiring a systemic examination, such as a compound trauma or a patient requiring a systemic vascular examination. The combination of high power, high scanning speed and the highest time resolution in the industry enables clinicians to obtain timely diagnostic data for critically ill patients in critical care.

Collagen

Collagen is the most abundant protein in mammals, accounting for 25% to 30% of the total protein. It is widely present in all tissues from the body surface of lower vertebrates to mammalian bodies. Collagen monomers are long cylindrical proteins with a length of about 280 nm and a diameter of 1.4–1.5 nm. It consists of 3 polypeptide chains that are supercoiled around each other.

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