Can a "fuzzy" nuclear medicine imaging device see a tumor?
When it comes to imaging equipment, people first think of anatomical-based imaging equipment such as X-CT and MRI. Indeed, since the discovery of X-rays by Roentgen in 1895, medical imaging has been almost always a radiographic image for a long time. However, with the birth of nuclear medicine imaging equipment such as γ camera, SPECT, PET, etc., this situation has quietly changed. What is nuclear medicine imaging equipment? Nuclear medicine imaging equipment is a nuclear medicine instrument that obtains the organ and tissue functions and structural images from the body according to the radionuclide tracing principle and the special law of metabolic distribution of radionuclides or their labeled compounds in the body. According to different radioactive tracers, nuclear medicine imaging equipment is mainly divided into two categories: single photon imaging equipment and positron imaging equipment. Single photon imaging devices include gamma cameras and SPECT, and positron imaging devices such as PET. The imaging of nuclear medicine mainly depends on the blood flow, cell function and quantity of organs or tissues, metabolic activity and drainage and drainage, etc. It is a functional metabolic imaging. Because of the low image resolution, especially the lack of anatomical information, nuclear medicine imaging has been dubbed "unclear medicine." CT, MRI and other examinations mainly show changes in anatomical morphology of organs or tissues. Although the resolution is high, the changes in functional metabolism are not as good as those in nuclear medicine. This determines that the relationship between nuclear medicine imaging technology and other imaging diagnostic techniques is complementary and complementary. PET-CT and PET-MR, which are the "high-tech high-tech medical crown", combine PET with CT or MRI. Using the same examination bed and the same image processing workstation, PET provides detailed functions of lesions. Molecular information such as metabolism, CT or MRI provides accurate anatomical location of the lesion, and combines PET images with CT or MRI images. One-time imaging can obtain tomographic images of all parts of the body, which is sensitive, accurate, specific and accurate. The purpose of early detection of lesions and diagnosis of disease. In Fig. 2, there are "blurred" PET images, "clear" CT images, and PET-CT fused images, respectively. Figure 2 PET imaging (left), CT imaging (middle) and PET-CT imaging (right) What are the advantages of nuclear medicine imaging equipment? Compared with other imaging diagnostic techniques, nuclear medicine imaging technology has the advantage of early diagnosis of disease. Malignant tumors can be cured if they are found early. However, malignant tumors and their metastases have the characteristics of rapid cell growth, strong metabolism and strong proliferative capacity. In the early stage of cancer, when cancer cells have not formed obvious tumors in the human body, anatomical-based imaging devices such as CT and MRI are basically difficult to find. However, the metabolic level of cancer cells is obviously different from that of normal cells. From the nuclear medicine image map, obvious "bright spots" can be seen, so that hidden cancer lesions can be discovered early, and early detection, early diagnosis and early treatment of cancer can be realized. Nuclear medicine imaging equipment fundamentally changes the traditional imaging equipment for tumor diagnosis, enabling clinicians to understand the dynamic process of tumorigenesis and development from the cellular level. At the same time, early diagnosis of neurological and psychiatric diseases such as coronary heart disease and epilepsy can be made. In developed countries and developed regions of China, some have used nuclear medicine imaging equipment as an effective means of screening tumors, brain and cardiovascular diseases.
In conclusion, we should correctly know about the 4K and the resolution, and choose the most suitable resolution when we buy a electric device, the DVR, the security monitoring device or something.
DVR 4K, Digital Video Recorder 4K, Digital 4K Video Camera Recorder, 4K DVR Security System, 4K DVR CCTV, 4K DVR Amazon SHENZHEN SANAN TECHNOLOGY CO.,LTD , https://www.sanan-cctv.com
So what does 4K resolution mean?
In the digital technology field, people usually use the binary operations and the pixels to describe the size of the digital image. Due to the huge number of pixels that make up a digital image, the digital image size is usually represented by K. The 10th power of 2 is 1024, so: 1K=2^10=1024, 2K=2^11=2048, 4K=2^12=4096. How many 1024 pixels there are in the horizontal direction means how many K a video includes. Specifically speaking, for example, the resolution 2048×1080, 2048 represents the number of pixels in the horizontal direction and 1080 represents the number of pixels in the vertical direction; similarly, when the resolution is 4096×2160, 4096 represents the number of pixels in the horizontal direction, and 2160 represents the number of pixels in the vertical direction. In the actual production of alphanumeric version and digital projection, the number of pixels in the horizontal or vertical direction of the image needs to be adjusted according to different aspect ratios. Therefore, the resolution of 8847360 pixels close to the 4K image can also be called the 4K such as the resolution 3840*2160 which is common on the market. And strictly speaking, the standard 4K resolution is exactly 4 times the number of pixels of the 2K resolution 2048×1080, and 16 times the number of pixels of the 1K resolution 1024×540.
4K resolution belongs to the Ultra HD resolution, which means that the audience will be able to see every detail and close-up in the photos/videos at this 4K resolution. If 4K resolution is applied to the cinema, the audiencescan cearly see every detail and close-up of the film whichever cornor of the cinema they are at.
4K resolution refers to that the pixel value per line in the horizontal direction reaches or approaches 4096, regardless of the aspect ratio. 4K resolution also has a variety of derivative resolutions, such as the Full Aperture 4K(4096*3112), the Academy 4K(3656*2664), and the UHDTV 4K(3840*2160), etc.,. And in the security and protection field, when we mention the 4K resolution, it refers to 3860*2160, 800W pixels.
4K resolution fits the resolution standard of the new generation of the Hollywood blockbusters. Different from both the so-called high-definition TV (1920×1080 resolution)that we watch at home and the large 2K resolution screen (2048×1080 resolution) of the traditional digital cinema, the 4K resolution means the ultra-high resolution video of the 4096×2160 resolution. The traditional high-definition TV shows the video of 2.07 million pixels, the traditional digital cinema shows the video of 2.21 million pixels, while the 4096×2160 resolution theater can show the high-definition video of 8.85 million pixels.
