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Test modules include: empty module; space resolution module (xy); space resolution module (z); low contrast module (aluminium) (xy); low contrast module (ptfe) (xy); low contrast module (delrin) (xy); low contrast module (ldpe) (xy); low contrast module (air) (xy)
(a) empty module: pmma material。
(b) space resolution module (xy): xy direction test module, space resolution: 1. 0 lp/mm, 1. 3 lp/mm. 1. 55 lp/mm, 1. 7 lp/mm, 2. 0 lp/mm, 2. 5 lp/mm, 2. 8 lp/mm, 3. 5 lp/mm, 4. 0 lp/mm.
(c) space resolution module (z): z direction testing module, space resolution: 1. 0 lp/mm, 1. 3 lp/mm
(d) low contrast module (aluminium) (xy): xy orientation test module with a diameter of 1. 0 mm, 2. 0 mm, 3. 0 mm, 4. 0 mm, 5. 0 mm.
(e) low contrast module (ptfe) (xy): xy orientation test module with a diameter of 1. 0 mm, 2. 0 mm, 3. 0 mm, 4. 0 mm, e) 5. 0 mm.
(f) low contrast module (dellin) (xy): xy orientation test module with a diameter of 1. 0 mm, 2. 0 mm, 3. 0 mm, 4. 0 mm, 5. 0 mm.
(g) low contrast module (ldpe) (xy): xy orientation test module, 1. 0 mm, 2. 0 mm, 3. 0 mm, 4. 0 mm, g) 5. 0 mm.
(h) low contrast module (air) (xy): xy orientation test module with a diameter of 1. 0 mm, 2. 0 mm, 3. 0 mm, 4. 0 mm, (h) 5. 0 mm.
(i) hypocrisy: 3 titanium bars of 5. 0 mm diameter。
Note: for the present document, ptfe is ptfe, pelrin, ldpe, pmma。
The matrix mass consists of pmma. The modulus are 160 m in diameter and have 7 35 m diameter cavities in the cylinders, each of which can be filled with a cylindrical module with different test modules, which can be assembled to meet different detection requirements。
Application criteria:
Yy/t 0795-2022t/wsjd8-2020 ct qc test instruction ws xx00xxixx0x cone x-ray computer layer image (cbct) equipment quality control test standard (ws target, immediately implemented)
Technical parameters in conformity with the " technical requirements for specialized computer-classized photography equipment for yyt0795-2022 oral collar cube " model:
1) basic material is pmma (pyromethylacrylate) and 160 mm in diameter。
2) the test module is designed for the structure of the fraction, including noise homogeneity, geometrical deformation, spatial resolution, contrast fraction, etc。
3) noise homogeneity module contains even pma materials with a minimum density of 1. 2+1. 0%.
4) the geometric deformation module contains more than 150 diameters of 2. 0 m and depths of 3. 0 mm。
5) the spatial resolution module consists of a linear diffusion function (lsf) and a point diffusion function (psf)。
6) the spatial resolution in xy can be as follows: (1. 0, 1. 3, 1. 55, 1. 7, 2. 0, 2. 5, 2. 8, 3. 5, 4. 0) lp/mm。
7) space resolution in the direction of z1 can reach (1. 0, 1. 3, 1. 55, 1. 7, 2. 0) lp/mm.
8) space resolution in the direction of z2 can reach (2. 0,2. 5, 2. 8, 3. 5, 4. 0) lp/mm。
9) low contrast module (aluminium, ptfe, delrin, ldpe, air) diameter: (1. 0, 2. 0, 3. 0, 4. 0, 5. 0) mm。
10) pixel strength/hu values detection module: materials: aluminium, ptfe, delrin, ldpe, air epoxy resin, embedded in pma base
11) metallic pseudo-image module: 3 5. 0 mm titanium diameter rods to verify metallic pseudo-image in pmma base。
Product composition configuration: main modules, functional modules 14, blank modules 29, repository
Product composition configuration: main modules, functional modules 14, blank modules 29, repository