CT scan

[zeebujha]

Can anyone please explain to me the principles of CT scanning??

 

[zeebujha]

After reading the application booklet, I have somehow cobbled up this answer. Please rectify my mistakes and suggest improvements to the answer:

CT scan builds a 3D image of a body by constructing 3D image of many slices through the body. Each section of a body is divided into voxels by a detector. Image of each voxel has a particular light intensity, or pixel. The instensity of a pixel is determine by measruing the X ray intensity of the pixel for various angles about the axis of the slice. A slice contains many small pixels. So, the data obtained by measuring light intensity of each pixel for each orientation is very large and thus the collection and stroage requires a powerful computer. Further, the reconstruction of each pixel of an image requires more than a million computation making the need for a powerful computer ever more necessary.
In order to construct a 3D image of the whole body, the procedure would be repeated for further sections through the body. All the data for all the sctions can be stored in a computer memory to create a 3-D image of the whole body which can be rotated and viewed from different angles.

 

[diwash]

CT Scanning is the technique in which series of X ray image is taken. Each image is taken through a section or slice of the boby from different angle.The angle of viewing and the image from each X-ray is fed into a high power computer. The computer processes the images and enables to bulid up a 2 D structure by combining these images. Repeted images from each slice produces a 3 dimensional image , which can be viewed from different angles.

 

[zeebujha]

"Repeted images from each slice produces a 3 dimensional image , which can be viewed from different angles". What does "repeated images from each slice" mean here?? Plus are we using the repeated 2D images of a slice to build up the 3D image of the slice itself?

 

[msk]

"Repeted images from each slice produces a 3 dimensional image , which can be viewed from different angles". What does "repeated images from each slice" mean here?? Plus are we using the repeated 2D images of a slice to build up the 3D image of the slice itself?

Repeated images of each slice means image of one lsice form different angles....and yes you are right many 2D images are taken which are computed to form a 3D image!

 

[zeebujha]

So, what is the difference in the 2D image produced by CT scan and the 2D image produced by X-rays on a photographic plate?? After all, both are both are 2D

 

[msk]

CT scan produces a 3D image....see in simple words many x-rays taken from different angles are assembled to make a 3D image of the organ that is CT!

 

[zeebujha]

CT Scanning is the technique in which series of X ray image is taken. Each image is taken through a section or slice of the boby from different angle.The angle of viewing and the image from each X-ray is fed into a high power computer. The computer processes the images and enables to bulid up a 2 D structure by combining these images. Repeted images from each slice produces a 3 dimensional image , which can be viewed from different angles.

But Diwash says that it creates a 2D image which are combined to form a 3D image. What I wanted to know is the difference
between the 2D formed in this and 2D formed in a simple X-ray photographic plate

 

[msk]

dude many 2D combine to form a 3D image.... if u take one xray from one angle it is a 2D image...now u take many xrays from different angles they are all 2D....now these all 2D images are fed into a computer than converts it into a 3D image...