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- since 1996 -
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Technical Discussions
Anish
Other, As Systems Engineer at TCS for 3 years and Lecturer in Govt College for a period of 9 months
India, Joined Sep 2014, 5

Anish

Other, As Systems Engineer at TCS for 3 years and Lecturer in Govt College for a period of 9 months
India,
Joined Sep 2014
5
11:24 May-31-2017
Calculation of focal spot as per EN12543

When I look for X tube tube specs some company mention their optical spot dimension as 2.6 X 2.6 , some other mention it as 3 mm or 1 mm (as per EN 12543).
Can someone tell me the difference between these two.?

Suppose if the dimension of the optical focal spot is 2.6 X 2.6 what is the size as per EN12543 standard in mm??

 
 Reply 
 
Dr. Uwe Zscherpel
Director,
BAM Berlin, Germany, Joined Jan 2010, 83

Dr. Uwe Zscherpel

Director,
BAM Berlin,
Germany,
Joined Jan 2010
83
21:28 Jun-13-2017
Re: Calculation of focal spot as per EN12543
In Reply to Anish at 11:24 May-31-2017 (Opening).

Dear Anish,
focal spot sizes of X-ray tuebs are not calculated but measured. The measurement procedure is published in EN 12543-2 (pin hole camera method, see also ASTM E 1165 for a slightly modified procedure). The result of this measurement procedure is the size of the focal spot along the tube axis (length) and perpendicular to it (width). The Annex in EN 12543-2 defines rounded values , which are using the larger value of both dimensions only. It just depend on the manufacturer of the X-ray tube, how far he read this standard! length x width is the starting point after mesaurement, but the Annex converts these values into a nominal spot size to be used in all the other ISO and EN standards for calculation of the geometrical image unsharpness.
Best regards
Uwe Z.

 
 Reply 
 
Omar AlKofahi
Omar AlKofahi
17:47 Dec-31-2018
Re: Calculation of focal spot as per EN12543
In Reply to Dr. Uwe Zscherpel at 21:28 Jun-13-2017 .

Dear Uwe,

I'm trying to simulate imaging performance for various tubes and would appreciate your help. How do I calculate the actual focal-spot size on the plane defined by the anode surface from the value given by the EN12543?

For example, if the Comet MXR-225 tube provides focal spot as (Focal spot acc. EN 12543) with an anode angle = 20 degrees, how can I convert that to actual focal-spot size on in the target plane?

Thank you,

Omar

 
 Reply 
 
Dr. Uwe Zscherpel
Director,
BAM Berlin, Germany, Joined Jan 2010, 83

Dr. Uwe Zscherpel

Director,
BAM Berlin,
Germany,
Joined Jan 2010
83
21:09 Jan-01-2019
Re: Calculation of focal spot as per EN12543
In Reply to Omar AlKofahi at 17:47 Dec-31-2018 .

Dear Omar,
the focal spot sizes as measured by EN 12543-2 ( and reported in the certificated from e.g. COMET) are the real dimensions of the focal spot as seen along the centre beam of the X-ray tube. Please see the appendix of EN 12543-2 for rounding to nominal values, e.g. a measured value of 2.6 mm is rounded to 3 mm according to this appendix. If you do not trust the values given to you, just use a pin hole camera and make your own focal spot image or look at the (film) image on your X-ray tube certificate.
Greetings Uwe Z.

 
 Reply 
 
Dr. Uwe Zscherpel
Director,
BAM Berlin, Germany, Joined Jan 2010, 83

Dr. Uwe Zscherpel

Director,
BAM Berlin,
Germany,
Joined Jan 2010
83
10:37 Jan-07-2019
Re: Calculation of focal spot as per EN12543
In Reply to Anish at 11:24 May-31-2017 (Opening).

If you have focal spot dimensions like 2.6x2.6, these seem to be values according to NEMA XR5 or IEC 336. But these standards are for medical X-ray tubes! In NDT ASTM E 1165 or EN 12543-2 defines only ONE value, the maximum focal spot extension in any direction. The values using the medical standards are up to a factor of 2 smaller than the values of the NDT standards for the same tube! These is the result of the measurement procedure and correction factors as described in these medical standards.
In any case, using a pinhole camera its very easy to measure the real focal spot size...
Best regards
Uwe Z.

 
 Reply 
 
Omar AlKofahi
Omar AlKofahi
15:52 Jan-08-2019
Re: Calculation of focal spot as per EN12543
In Reply to Dr. Uwe Zscherpel at 10:37 Jan-07-2019 .

Dear Uwe,

Understood. As you point out, it actually explicitly stats EN12543 3.3 mm (single number).

Again, thank you very much for your help.

Omar

 
 Reply 
 

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