A computed tomography (CT) scan uses specialized X-ray equipment to create cross-sectional images of the body, providing detailed views of organs, soft tissues, and bones. Anxiety about a CT scan often stems from the unknown nature of the procedure and the equipment involved. Understanding the physical sensations and logistics of the scan can significantly reduce apprehension and demystify the process.
What a CT Scan Actually Feels Like
The CT machine resembles a large, open ring, sometimes described as a doughnut, which is a key distinction from the more enclosed tunnel of an MRI machine. You will lie on a motorized table that slides into and through this opening, and depending on the area being scanned, your head and feet may remain outside the main gantry. Because the machine is relatively open, many people who experience claustrophobia in enclosed spaces find the CT scan more tolerable.
The scan itself is completely painless as the X-rays pass through your body to collect the images. While the machine is operating, you will hear mechanical sounds, including soft whirring, buzzing, and clicking noises as the internal components rotate. These sounds are not excessively loud or jarring, comparable to a mild hum.
The actual time spent inside the scanner is surprisingly brief, often lasting only a few minutes. Even for complex scans, the total time from getting positioned to finishing the image acquisition is usually less than 30 minutes. The technologist will monitor you from a separate control room and communicate with you through an intercom system throughout the process.
Practical Steps for Preparation and Reducing Anxiety
Preparation begins with following the instructions provided by the facility, which may include fasting for several hours before the appointment if an intravenous contrast is planned. You should wear comfortable, loose-fitting clothing and remove all metal objects, such as jewelry, belts, and glasses, as metal can interfere with the X-ray images. If you have severe anxiety or claustrophobia, discussing this with your doctor beforehand may allow for a mild oral sedative to be prescribed.
During the scan, the most important instruction is to remain perfectly still to prevent the images from blurring. The technologist will guide you on when to hold your breath, which is usually only for brief intervals of a few seconds at a time. Maintaining communication with the technologist through the intercom is a simple way to feel more in control and address any sudden concerns.
Simple techniques can help manage anxiety while you are positioned on the table. Focusing on slow, deep breathing exercises can promote relaxation and minimize the body’s stress response. Sometimes, simply closing your eyes once you are positioned can eliminate the visual sensation of the scanner moving around you. You can also ask the facility if they are able to play music in the room, which can serve as a soothing distraction.
Understanding Contrast Materials
In some cases, a contrast material, often an iodine-based dye, is administered to enhance the visibility of specific tissues, blood vessels, or internal organs on the images. The dye is typically given through an intravenous (IV) line inserted into a vein in your arm, which is the only part of the procedure that involves a quick, sharp pinch similar to a blood draw.
The injection of this contrast material causes specific, temporary physical sensations that are normal and expected. Almost all patients experience a sudden, warm flush or feeling of heat that spreads quickly throughout the body. This sensation is sometimes described as feeling like they have urinated.
Along with the warmth, a metallic or strange taste in the mouth is a common, temporary side effect. These sensations are brief, usually subsiding within a minute or two after the injection is complete. It is important to inform the medical staff about any allergies, kidney conditions, or diabetes beforehand, as these factors can influence the type of contrast used.