64-row spiral CT adopts a new generation of high-power, high-milliampere output bulb, detector rows up to 64 rows, faster spiral scanning speed (≤ 0.35 sec/revolution), time resolution is significantly improved (<50 ms), cardiac sub-millimeter layer thickness of the CT scanning time of only about 5~9 seconds, can obtain excellent coronary artery CT images.
Introduction, Principle, Scope, Comparison, Superiority, Characteristics, Introduction The thinnest layer of 64-row helical CT scanning can be up to 0.64MM, which is the thinnest layer thickness that can be achieved in the world at present, and thus improves the resolution of the image. Principle 64-row spiral CT breaks through the design of traditional CT and adopts the sliding ring technology, which connects the power supply cable and some signal cables with different metal rings in the fixed frame to connect the sliding brushes of the moving X-ray tube and detector with the metal ring. The bulb tube and detector are not limited by the length of the cable, continuous and uniform rotation along the long axis of the human body, the scanning bed synchronized with uniform progression (traditional CT scanning bed is stationary during the scanning), the scanning trajectory is a spiral forward, can be quickly and uninterruptedly complete the volumetric scanning. Acquiring 64 sub-millimeter layer thickness images, it can carry out image reconstruction in any plane such as cross-section, sagittal plane, coronal plane, etc., and complete three-dimensional stereo reconstruction, multi-layer reconstruction, organ surface reconstruction, etc. Adjustment is made in multiple directions to obtain arbitrary section images, which allows us to better understand the details of the lesion and spatial anatomical relationships. It is especially suitable for the display of three-dimensional structure of the skull, maxillofacial region, spine, bone and joints, etc. It can display soft tissue and bony structure layer by layer, and obtain more fine three-dimensional stereo images. 64-row spiral CT Scope of application 64-row spiral CT with its non-invasive, efficient, accurate, three-dimensional medical imaging technology is suitable for the circulatory system, bone and joints, pain and rehabilitation deformity correction assessment and internal fixation bracket fluoroscopy technology, the respiratory system, the digestive system, and the diagnosis of various parts of the human body disease. Comparison Compared with 16-row and 32-row CT, 64-row CT allows clinicians to see more precise details, thinner layer thickness, reduced radiation dose, and can "pull out" diseased blood vessels for observation, as well as "peeling and boning", with lesions as small as 0.5mm. 0.5 millimeter lesions can let doctors see at a glance. Superiority 64-row spiral CT is still the world's more advanced diagnostic equipment for cardiovascular and cerebrovascular diseases, its unique non-invasive, efficient, accurate, three-dimensional medical imaging technology, in the examination of the arterial stenosis, bypass grafts, stents, morphology, and the analysis of cardiac function has a great deal of superiority. It realizes non-invasive examination of coronary artery and provides a safe, rapid and inexpensive examination method for screening and diagnosis of coronary heart disease. In addition, 64-row spiral CT can not only carry out morphological diagnosis, but also can be used for functional imaging diagnosis, such as cerebral perfusion imaging of the set of early display of cerebral ischemic foci. Especially fast scanning speed, 64-row spiral CT in emergency medicine and early diagnosis of pulmonary embolism has a unique advantage, can also be used to screen coronary heart disease, lung cancer, cirrhosis of the liver, and benign and malignant tumor analysis. Features Compared with the previous multilayer spiral CT, LightSpeed VCT (64-slice spiral CT) has the following technical features: First, the coverage of the longitudinal axis based on high spatial resolution (sub-millimeter) has increased dramatically, and 64 sub-millimeter layer-thickness images can be acquired at the same time, and the coverage of the longest rotation of one week will be nearly 40 mm; the VCT thin-slice scanning realizes true volume data acquisition, and the image resolution varies from one to the other; the VCT thin-slice scanning realizes true volumetric data acquisition, and the image resolution is different from the other. VCT thin-layer scanning realizes true volumetric data acquisition, isotropic image resolution, image reconstruction in any plane such as transverse, sagittal, coronal, etc. For the acquired images, we can perform multiplanar imaging (MPR), which means that we only need to scan once and adjust in multiple directions to obtain an arbitrary section. Multiple directions are adjusted to obtain arbitrary section images, allowing us to better understand the details of the lesion and the spatial anatomical relationship. Secondly, the unprecedented improvement in time resolution, weekly rotation can be shortened to 0.33 S. Acquisition of the same volume of data, scanning time is greatly reduced, a breath-holding 20s, you can complete the body scanning; scanning coverage per unit of time is significantly improved, the patient receives a significantly reduced dose of radiation; the shortening of scanning time so that the dosage of the contrast agent is significantly reduced in the enhanced scanning. Keep a certain pressure of the contrast agent to be injected until the end of the scan, in order to ensure the enhancement effect. For example, CT aortic imaging, even with a 4-slice CT, requires a scan of about 60 s. An injection rate of 2 ml/s requires at least 120 ml of contrast. A minimum of 120 ml of contrast is required. 64-slice CT requires a maximum of 20 s. The same injection rate requires only about 6Oml (or about 1 ml of contrast). The same injection rate. Only about 6Oml (including delay time) contrast can achieve the same effect. Third, the imaging soft body has been improved, the collected data can be used for conventional image display, but also in the workstation for post-processing, complete three-dimensional reconstruction, multi-layer reconstruction, organ surface reconstruction, etc., and can be displayed in real time or near real-time, through the adjustment of the reconstruction threshold, layer by layer display of the soft tissues and bony structures, especially for the skull, maxillofacial, spine, bone and joints, etc., the display of three-dimensional structure, can obtain a more detailed three-dimensional structure, can obtain a more detailed three-dimensional structure. It is especially suitable for displaying the three-dimensional structure of the skull, maxillofacial region, spine, bone and joints, etc., and can obtain more detailed three-dimensional stereo images. In addition, due to the anisotropy of VCT resolution, while obtaining the results of conventional cross-sectional images, it obtains the information of the internal structure of the lumen which is similar to that of endoscopy, and it is suitable for displaying the structure of the lumen of the paranasal sinuses, trachea bronchial tubes, gastrointestinal tract, and blood vessels, etc. It is possible to rotate the image at different angles, and mark the image in different colors, which makes the image more three-dimensional, intuitive, and lifelike.