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Bafa



Joined: 30 Jul 2008
Posts: 6
PostPosted: Thu Aug 28, 2008 3:38 pm    Post subject: Calculate pixel size in CT?? Reply with quote

When calculating what my pixel size is I got myself a little confused on the equation. If my FOV is 350mm and matrix size is 512 is my calculation:
350 / 512 =0.68359375mm

or is it:
(350*350) / (512*512) = 122500 / 262144 = 0.4673004150390625

Thanks

pmptrainer



Joined: 29 Aug 2008
Posts: 3
PostPosted: Fri Aug 29, 2008 8:21 am    Post subject: Reply with quote

errr.....isn't there some book to that has the formula for that??
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Last edited by pmptrainer on Mon Sep 01, 2008 2:25 pm; edited 2 times in total

CTDave
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Joined: 25 Mar 2005
Posts: 218
Location: West Virginia
PostPosted: Sun Aug 31, 2008 8:21 am    Post subject: Re:Calculate pixel size in CT?? Reply with quote

The display field of view and the matrix determine the pixel size. The size of the pixel can be determined by dividing the field of view by the matrix size.

Pixel size = Field of view / Matrix size

or

Field of view = Pixel size X Matrix size
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Picker



Joined: 02 Sep 2008
Posts: 1
PostPosted: Tue Sep 02, 2008 3:55 am    Post subject: Reply with quote

Bafa wrote:
350 / 512 =0.68359375mm
In this case, you are dividing the length of all the pixels at one side of the matrix by the number of pixels. That gives you the length of one pixel.

Bafa wrote:
(350*350) / (512*512) = 122500 / 262144 = 0.4673004150390625
Here you are dividing the area of your matrix by the total number of pixels in that area, which gives you the area of one pixel.

In fact, 0.68359375 x 0.68359375 = 0.4673004150390625

So your pixel size is 0.683 mm x 0.683 mm or 0.467 mm^2.
Both are correct! Smile

Bafa



Joined: 30 Jul 2008
Posts: 6
PostPosted: Wed Sep 03, 2008 9:04 am    Post subject: Reply with quote

[quote="Picker"]
Bafa wrote:
**snip**

So your pixel size is 0.683 mm x 0.683 mm or 0.467 mm^2.
Both are correct! Smile

Great explaination. Thanks a bunch

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