2024-03-28T11:04:21Z
https://tsukuba.repo.nii.ac.jp/oai
oai:tsukuba.repo.nii.ac.jp:00039575
2022-04-27T09:07:50Z
2780:4964
3:62:5598:657
Derivation of total filtration thickness for diagnostic x-ray source assembly
関本, 道治
Sekimoto, Michiharu
Katoh, Yoh
The method defined by the IEC 60522 for determining the inherent filtration of an x-ray source device is applicable only for a limited range of tube voltage. Because the users cannot legally remove the x-ray movable diaphragm of the x-ray source device, total filtration, which is the sum of the additional filtration diaphragm movable for specific filtration and x-ray, cannot be measured. We develop a method for simply obtaining the total filtration for different tube voltage values.
Total filtration can be estimated from a ratio R' of the air kerma $K_{x+T}^{\prime}$ , which is measured with an Al plate with thickness T, and $K_{x}^{\prime}$ measured without an Al plate. The conditions of the target material of the x-ray source device are then entered into the Report 78 Spectrum Processor to calculate the air kerma K x and K x+T for Al thicknesses x and (x + T), respectively, to obtain R. The minimum value of x, which is the difference between the R and R', is the total filtration of the x-ray source device.
The total filtration calculated using the industrial x-ray source device was within ±1% in the 40–120 kV range. This method can calculate the total filtration using air kerma measurements with and without the Al plate. Therefore, the load on the x-ray tube can be reduced, and preparation of multiple Al plates is not necessary. Furthermore, for the 40–120 kV tube voltage range, the user can easily measure the total filtration.
journal article
IOP Publishing
2016-08
application/pdf
Physics in medicine and biology
16
61
6011
6024
0031-9155
AA00774048
https://tsukuba.repo.nii.ac.jp/record/39575/files/PMB_61-16.pdf
eng
27444803
10.1088/0031-9155/61/16/6011
© 2016 Institute of Physics and Engineering in Medicine
Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.