什么是CT扫描?

计算机断层扫描通常被称为CT扫描. CT扫描是一种诊断成像程序，它使用了 x射线 计算机技术可以产生人体内部的图像. 它能显示身体任何部位的详细图像, 包括骨头, 肌肉, 脂肪, 器官和血管.

CT扫描比标准的x光扫描更详细. 在标准的x射线中，一束能量瞄准被研究的身体部位. A plate behind the body part captures the variations of the energy beam 后 it passes through skin, 骨, 肌肉和其他组织. 虽然从常规的x射线中可以获得很多信息, 关于内部器官和其他结构的很多细节是无法获得的.

在CT中，x射线束绕着身体做圆周运动. This allows many different views of the same organ or structure 和 provides much greater detail. The X-ray information is sent to a computer that interprets the X-ray data 和 displays it in two-dimensional form on a monitor. 更新的技术和计算机软件使三维图像成为可能.

CT扫描可以帮助诊断肿瘤, 检查内出血, 或者检查是否有其他内伤或损伤. CT也可用于a 组织或液体活检.

为什么CT扫描有时要按对比排序?

CT扫描可以进行对比，也可以不进行对比. Contrast refers to a substance taken by mouth or injected into an IV line that causes the particular organ or tissue under study to be seen more clearly. Contrast examinations may require you to fast f或者一个 certain period of time before the procedure. 你的医生会在手术前通知你.

You will need to let your doctor know if you have ever had a reaction to any contrast media 和/或者一个ny kidney problems. A reported seafood allergy is not considered to be a contraindication for iodinated contrast. 如果你有任何身体状况或最近的疾病，告诉你的医生.

我该如何准备CT扫描?

如果你有 计算机断层血管造影(CTA) 或者一个 虚拟结肠镜检查，您在预约时将会得到具体的指示.

预防措施:如果你怀孕了或认为你可能怀孕了, 请在安排检查前咨询您的医生.

服装你可能会被要求换上病号服. 如果是这样，我们会为你提供一件长袍. 请摘下所有的穿孔，并将所有珠宝和贵重物品留在家中.

对比媒体你的检查可能需要做对比检查. The contrast media improves the radiologist’s ability to find structures that are abnormal 和 underst和 normal anatomy better.

• 有些患者不应使用碘基造影剂. If you have problems 与 your kidney function, please inform your radiologist in advance. We may be able to perform the scan 没有 the contrast media or find an alternate imaging exam.
• 最常见的CT扫描类型是双重对比研究, which will require you to drink a contrast media before your exam begins in addition to the IV contrast. 你能喝的对比酒越多, 放射科医生看到的消化道图像越清晰.

过敏: Please inform the access center representative when you schedule your scan if you have had an allergic reaction to any contrast media. IV contrast will not be administered if you have had a severe 或者一个naphylactic reaction to any contrast media in the past. Mild to moderate reactions warrant a plan that includes taking medication prior to CT检查. 这些计划将在您安排考试时与您详细讨论. Any known reactions to a contrast media should be discussed 与 your personal physician.

吃/喝如果你的书房是有序的 没有 相比之下，你可以在考试前吃、喝和服用处方药物.

如果你的医生让你做CT扫描 与 相反，在CT扫描前三小时不要吃任何东西. 我们鼓励你喝清澈的液体. 您也可以在检查前服用处方药物.

糖尿病患者:有 糖尿病 应该在扫描前三小时吃清淡的早餐或午餐吗. 这取决于你的口服糖尿病药物, 您可能会被要求停止使用药物48小时 后 CT检查. 详细说明将在您的检查后给出.

药物治疗所有推荐十大正规网赌平台都可以照常服用处方药物.

CT扫描的风险是什么?

If you are pregnant or think you may be pregnant, you should notify your health care provider.

在CT扫描中使用的辐射剂量很小. You may want to ask your doct或者一个bout the amount of radiation used during the CT procedure 和 the risks related to your particular situation.

If you are claustrophobic or tend to become anxious easily, tell your doct或者一个head of time. You may be prescribed a mild sedative to take before the procedure to make you more comfortable.

CT扫描时发生了什么?

CT scans may be performed on an outpatient basis 或者一个s part of your stay in a hospital. 治疗方法可能会根据你的病情和医生的做法而有所不同. 一般来说，CT扫描遵循这个过程:

• 你可能会被要求换上病号服. 如果是这样，我们会为你提供一件长袍. 将提供一个储物柜来保管所有个人物品. 请摘下所有的穿孔，并将所有珠宝和贵重物品留在家中.
• 如果你要做对比手术, 在手或手臂上开始静脉注射造影剂. 对于口服造影剂，医生会给你一种液体造影剂，让你吞咽. 在某些情况下，可以在直肠造影.
• You will lie on a scan table that slides into a large, circular opening of the scanning machine.
• 技术人员将在另一个房间，那里有扫描仪的控制. 然而，你将通过一扇窗户一直看到技术专家. Speakers inside the scanner will enable the technologist to communicate 与 和 hear you. You may have a call button so that you can let the technologist know if you have any problems during the procedure. The technologist will be watching you at all times 和 will be in constant communication.
• 扫描仪开始在你周围旋转, x射线会在短时间内穿过人体. 你会听到咔哒声，这是正常的.
• The x射线 absorbed by the body’s tissues will be detected by the scanner 和 transmitted to the computer. The computer will transform the information into an image to be interpreted by the radiologist.
• 在手术过程中保持不动是很重要的. 在手术过程中，你可能会被要求在不同的时间屏住呼吸.
• 如果您的手术使用造影剂, 当造影剂注入静脉管线时，你可能会感觉到一些影响. 这些影响包括脸红的感觉, 咸味:口中的咸味或金属味, 短暂的头痛, 或者恶心和/或呕吐. 这些影响通常会持续几分钟.
• 如果你有呼吸困难，你应该通知技师, 出汗, 麻木或心悸.
• 程序完成后，您将离开扫描仪.
• 如果静脉注射是为了注射造影剂，那么静脉注射线将被移除.
• 而CT检查本身不会引起疼痛, having to lie still for the length of the procedure might cause some discomfort or pain, 特别是在最近受伤或侵入性手术的情况下, 比如手术. The technologist will use all possible comfort measures 和 complete the procedure as quickly as possible to minimize any discomfort or pain.

CT扫描后会发生什么?

• 如果在您的手术过程中使用了造影剂, you may be monitored f或者一个 period of time f或者一个ny side effects or reactions to the contrast, 比如瘙痒, 肿胀, 皮疹或呼吸困难.
• 如果你感到疼痛, redness 和/or 肿胀 at the IV site 后 you return home following your procedure, 你应该通知你的医生, 因为这可能表明感染或其他类型的反应.
• CT扫描后通常不需要特殊的护理. You may resume your usual diet 和 activities unless your doct或者一个dvises you differently.
• 你的医生可能会在手术后给你额外的或替代的指示, 这取决于你的具体情况.

CT技术有哪些进步?

CT技术的进步包括:

• 高分辨率CT:这种类型的CT扫描使用非常薄的切片(小于0.1英寸), 在特定条件下，哪些能有效地提供更多的细节, 比如肺病.
• 螺旋或螺旋CT:在这种类型的CT扫描期间, 推荐十大正规网赌平台和x射线都连续移动, x射线束环绕着推荐十大正规网赌平台. 与标准CT扫描相比，获得图像的速度要快得多. The resulting images have greater resolution 和 contrast, providing more detailed information. Multidetector-row helical CT scanners may be used to obtain information about calcium buildup inside 心脏的冠状动脉.
• 超快的CT (也称为电子束CT):这种类型的CT扫描产生图像非常快, 这样就创造了一种身体活动部位的“电影”, 比如心脏的腔室和瓣膜. This scan may also be used to obtain information about calcium buildup inside 心脏的冠状动脉, 但螺旋扫描仪更为常见.
• 计算机断层血管造影(CTA)血管造影术(或动脉造影术)是血管的x射线图像. A CT angiogram uses CT technology rather than st和ard x射线 or fluoroscopy to obtain images of blood vessels — for example, 心脏的冠状动脉.
• 结合 正电子发射断层扫描 和 CT (PET/CT): The combination of CT 和 正电子发射断层扫描 technologies into a single machine is referred to as PET/CT. PET/CT combines the ability of CT to provide detailed anatomy 与 that of PET to show cell function 和 metabolism in order to offer greater accuracy in the diagnosis 和 treatment of certain types of diseases, 尤其是癌症. PET/CT也可用于评估以下情况 癫痫, 阿尔茨海默病 和 冠状动脉疾病.