What is an HRCT scan? (High-Resolution Computed Tomography) Let's understand it simply!

Have you been having a cough or shortness of breath for a while? Your doctor may have done a chest X-ray. But when the X-ray didn't show any significant changes, did the doctor tell you to "do an HRCT scan" next? When he said that, you might have felt a little scared and curious about what this is. So, today, let's talk about this HRCT scan very simply and in a friendly way.

Simply put, what is an HRCT scan?

HRCT (High-Resolution Computed Tomography) is a special scan that takes very clear, detailed pictures of the inside of your lungs . It's like taking high-definition photos of your lungs. These pictures can show changes in the tiny airways, air sacs (alveoli), and the delicate tissues around them. During the scan, you lie on a special bed. Then the bed slowly moves into a large, circular machine. This machine rotates around you and takes many X-ray pictures (called 'slices') from different angles. Finally, a computer combines all of these pictures to create a three-dimensional (3D) image of your lungs.

What is the difference between an HRCT and a regular Chest CT?

This is a very important question. The images obtained from an HRCT scan are much clearer and more detailed than those obtained from a regular chest CT scan. Think of it this way. You have a picture book with many pages.

• A typical CT scan is like looking at the pages of a book from top to bottom, one on top of the other. Everything in the book appears together. Maybe a small picture inside isn't clearly visible.
• An HRCT scan is like turning the pages of a book slowly, one by one, carefully examining the fine details on each page. That's when you can capture even the smallest changes in the lungs without missing a beat.

Additionally, during an HRCT, the doctor can take pictures of you in different positions (lying on your back or lying down). They can also take pictures of you while you breathe in and out. These methods can provide more in-depth information about lung conditions.

What diseases is HRCT used to diagnose?

HRCT is recommended if your doctor suspects that you have a problem with your lungs, especially if something is not clearly visible on an X-ray. It is also used to see how an already diagnosed lung disease changes over time. The table below shows some of the conditions in which HRCT is most commonly used.

How should I prepare for an HRCT scan?

This doesn't require much preparation. It's very simple.

• Wear as comfortable clothing as possible on the day of the scan.
• You will be asked to remove metal jewelry, watches, and earrings as they may interfere with the scan images.
• If you are pregnant or may be pregnant, be sure to tell the doctor or staff before the scan.
• Some people feel a little scared and uncomfortable when they are in small, enclosed spaces. If you feel that way too, let us know in advance.
• If you find it difficult to stay still during the scan, let the staff know.

What happens during the scan?

There is no reason to be afraid. This is not a painful test. 1. First, the staff will make you lie down on a bed connected to the scanner. Perhaps with your arms up or down. 2. Then the bed will slowly move into the scanning machine. 3. While the machine rotates around you and takes pictures, the bed may move slightly forward and backward. 4. Most importantly, during the scan, the staff will give you instructions such as "Now breathe in, hold your breath" or "Now breathe out." Follow these instructions as closely as possible. This is very important to get clear images. 5. After all the necessary pictures have been taken, the bed will come out again. Then you can get up and leave.

How long will this take?

The scan itself takes a very short time , between 5 and 10 minutes . However, when all the preparation time is added up, it can take up to 30 minutes or an hour.

What are the advantages and disadvantages of HRCT?

Like any medical test, this one has advantages and minor disadvantages. Another big advantage is that HRCT scans usually do not require the injection of contrast dye. That means no needles are used, and there is no need to worry about allergic reactions to the dye. The downside is that this scan does involve exposure to some amount of ionizing radiation. However, doctors only recommend this test when the benefits of the test far outweigh the risks. So don't be too worried about it.

What happens after receiving the report?

Your scans will be carefully reviewed by a radiologist and your treating doctor. This can take a few days. So, ask your doctor when you will get the results and how they will talk to you about them. Sometimes we feel a little nervous while waiting for the results of a scan. That's normal. But remember, getting clear information about what's going on inside your body from a test like this will help you and your doctor decide on the best treatment plan for you . HRCT scan Sinhala, HRCT scan, lung scan, CT scan, High-Resolution Computed Tomography, lung diseases, respiratory diseases