准确讲，我们常见的CT其实应该被称为X ray-CT，它使用的还是X光，只是多个一个“Computed Tomography（CT，计算断层成像）”，也就是用了一种新的成像方式而已。 我们看上边那位潮男，会发现他本应立体的鼻子在这张二维图像上完全叠在了一起，因为这是一张 投影图，X光信号全部累加在了一张图上。 这时候如果某处有个病灶，我们根本看不出来它的深浅位置。 如果我们想看像切西瓜那样的一层一层的 断面图 呢？ 仅从那一张图显然是不可能的。 但是如果我们获取 …

Learn the differences between a CT scan, MRI and X-ray so you can have an informed discussion with your doctor about which type of imaging is right for you. CT scans, MRIs and X-rays are all diagnostic tools that allow doctors to see the internal structures of the body.

2019年12月4日 · CT的成像原理是应用X线束围绕人体的某一部位连续断面扫描，具有扫描时间快，图像清晰等特点，可用于多种疾病的检查。 CT一般分为平扫和造影增强扫描。 平扫是指不用造影增强或造影的普通扫描， 主要应用于对比度比较大的组织，如肺和骨骼。 多数脏器及组织的肿瘤检查通常需要增强扫描以帮助诊断。 增强扫描用高压注射器经静脉注入碘剂（如碘帕醇）后再行扫描的方法。 血内碘浓度增高后，器官与病灶内碘的浓度可产生差别，形成密度差，能使病 …

2023年8月11日 · ct检查 X线投照，但成像方式是断层采集和数据重建，解决了X线检查的脏器重叠问题，分辨率显著高于X线。 通俗讲，CT切片了再看，还是用X光给身体拍照片，不过要拍很多张，[一层层]地看。

Since its introduction in the 1970s, [27] CT has become an important tool in medical imaging to supplement conventional X-ray imaging and medical ultrasonography. It has more recently been used for preventive medicine or screening for disease, for example, CT colonography for people with a high risk of colon cancer , or full-motion heart scans ...

X射线计算机断层成像（X-Ray Computed Tomography，简称X-CT）是一种利用数位几何处理后重建的三维放射线医学影像。 该技术主要通过单一轴面的X射线旋转照射人体，由于不同的组织对X射线的吸收能力（或称阻射率）不同，可以用电脑的三维技术重建出断层面影像。

The term “computed tomography,” or CT, refers to a computerized x-ray imaging procedure in which a narrow beam of x-rays is aimed at a patient and quickly rotated around the body, producing signals that are processed by the machine’s computer to generate cross-sectional images, or “slices.”

2024年1月11日 · Radiography (commonly referred to as “X-ray“) and computed tomography (CT) imaging examinations both use ionizing electromagnetic radiation in the form of X-ray photons (energy) to create images of your body. In radiography, the X-ray source emits a small amount of radiation photons through the body part of interest.

2024年5月7日 · A computerized tomography scan, also called a CT scan, is a type of imaging that uses X-ray techniques to create detailed images of the body. It then uses a computer to create cross-sectional images, also called slices, of the bones, …

2025年2月21日 · Computed tomography (CT), also known as, especially in the older literature and textbooks, computerized axial tomography (CAT), is an imaging modality that uses x-rays to build cross-sectional images ("slices") of the body.