Algebraic Reconstruction Technique is a way to make pictures of things inside our bodies. It's like taking a picture of a toy inside a box, but instead of looking at it from the outside, we look at it from different angles and use math to put together a picture of what's inside.
Imagine you have a toy in a box that you can't open. You can take a picture of the outside of the box, but you can't see what's inside. Now, let's take a special camera that can take pictures of the toy from different angles. We take pictures from the top, from the sides, from the bottom, and so on.
Now that we have all these pictures, we use math to figure out what the toy looks like from the inside. It's like putting together a puzzle, but instead of matching the puzzle pieces, we match the pictures from different angles to get a better idea of what's inside the box.
This is kinda like what the Algebraic Reconstruction Technique does. It takes a bunch of X-rays of a person's body from different angles and uses math to put together a 3D picture of their insides. This helps doctors see what's going on inside the person without having to actually cut them open.
So, in short, Algebraic Reconstruction Technique is a clever way to take a bunch of pictures from different angles and put them together to make a picture of what's inside a person's body.