Collimator manufacturing process

FIELD: optics.

SUBSTANCE: proposed process includes layer-by-layer cross-linking of photopolymerizing molecules by means of focused optical radiation to produce spatially confined X-ray passages disposed within X-ray absorbing material. To this end X-ray absorbing material is added in advance to photopolymerized material, and collimator space, except for X-ray passages, is cross-linked using photochemical method.

EFFECT: enhanced spatial resolution and convergence of spatially confined X-ray passages into single point; reduced cost of process.

3 cl

 

The invention relates to the field of diagnostics with the use of penetrating radiation and can be used in the manufacture of devices for the conversion of particle beams and radiation, for example in medical radiological technique to limit the passage of radiation propagating in different directions, a set of paths for suppressing the propagation of radiation in other directions.

A known method of manufacturing a collimator of a set of perforated metal plates, separated by polymer layers. With the addition of the plates are formed spatially restricted path of x-rays, allowing you to skip radiation for a given set of directions and suppress the radiation propagating in other directions. In the important particular case (the axis of the passages converge in focus)by changing the thickness of the strips is possible to change the focal length of the collimator. In the manufacture of layers of the collimator is used the technology of photolithography (including the reduction optical image) followed by etching. In some embodiments, a method of manufacturing a material absorbing the radiation is applied directly to the layers (U.S. Pat. US 4288697, CL G 02 In 5/00, 1981).

However, due to limitations of the technology used in the simple reduction of diameter is antenna limited ways of passing x-ray radiation it is necessary to use a thinner plate, so the number of plates (the time and cost of production) increases, and when their axes converge, their shape is not smooth cylinder, and represents the step nonsmooth body, so transparency spatially restricted path of x-rays is variable in cross-section, which complicates the interpretation of information collected through such a collimator and worsens, eventually, the spatial resolution of the collimator.

A known method of manufacturing a collimator, including the execution in the amount of absorbing x-ray radiation material spatially restricted ways of passing x-ray radiation in the form of parallel through holes produced using chemical, mechanical or laser drilling (U.S. Pat. US 4144457, NCI 250/445 T, 1979).

However, the collimators are made in a way that does not simultaneously satisfy two basic requirements: high spatial resolution and convergence of the axes of the spatial restricted paths of x-rays in one point. Ensuring these requirements significantly increases the cost of the collimator.

The present invention solves the problem of creating collimator high spatial resolution, including convergence EfE is spatially restricted path of x-rays into a single point with a simultaneous reduction of the technology.

This object is achieved in that in the method of manufacturing a collimator, including the execution in the amount of absorbing x-ray radiation material spatially restricted path of x-rays, according to the invention the path of x-rays form a layer-by-layer by cross-linking molecules photopolymerizable composition with a focused optical radiation.

The essence of our invention consists in creating the main part of the collimator in the form of a single part by the layer of growing its structure.

You can go two ways. In the first variant - photochemically sew the path of x-rays, followed by filling the free space with material that absorbs x-ray radiation. The second bound volume of the collimator, in addition to ways of passing x-ray radiation, after adding in photopolymerizable composition material absorbing x-rays.

A source of optical radiation may be a laser, an incandescent lamp, etc.

In the first embodiment to provide rigidity and immutability of form and relative location of the path of x-rays in their formation process it is possible to connect an additional hard tie the AMI.

To increase the coefficient of the x-ray radiation, the polymer is stitched in place ways of passing x-ray radiation, after filling the space with material that absorbs x-ray radiation, it is better to remove.

Fill free space with material that absorbs x-ray radiation, can be performed by electrochemical deposition.

However, it is easier and cheaper to take the material absorbing x-ray radiation, in powder form, and to fill the free space.

To consolidate the powder, you can optionally add the binder.

To reduce the weight of the collimator in the powder, you can add material-filler, which take substances with low specific weight, for example polymers, quartz, glass and the like, and mix it with a material that absorbs x-ray radiation or to place it in the layers between the layers of material absorbing x-rays.

In the second embodiment, to increase the coefficient of the x-ray unstitched part photopolymerizable composition can be removed.

Material absorbing x-ray radiation, can be taken in the form of a chemical element (tungsten, lead, bismuth, uranium, its oxide, salts thereof and/or mixtures thereof.

The invention is illustrated by, but not ischerpivayushii examples.

Example 1. The path of x-ray radiation is formed using stereolithography method. The photopolymer (iplit-1, NESTL-1) a focused laser beam, matching photochemically its molecule, is made at first base, and then raise the bars towards the focus. After manufacturing the inverse impression of the future of the collimator spend filling the free volume of the material absorbing x-ray radiation, such as lead. This made the mould is placed in the electrolyte solution (alkaline solution of lead acetate). The anode is made of plates of lead. The cathode connected to the base of the mould. Then hold electrochemical deposition of lead between the columns.

Example 2. Same as in example 1, except for increasing the coefficient of the x-ray radiation polymer (cross-linked in the places of the paths of x-rays, after filling the free space with lead) is removed by dissolving it in 20%caustic soda solution. This collimator has a spatial resolution of 1.5 mm at a focal length of 10 cm, and the coefficient of the x-ray radiation has increased to 98% (about 10%).

Example 3. Same as in example 1, only to ensure rigidity and immutability shape and mutual arrangement of paths x) is ing them in the process of forming the connecting additional hard ligaments, and as a material absorbing x-rays, take powder of metal, such as tungsten, and fill them with strict form, in which were formed the path of x-ray radiation. This collimator has a spatial resolution of 0.9 mm at the same focal distance of 10 cm

Example 4. Same as in example 3, only to ensure the rigidity of the volume of the collimator powder tungsten moisten glue (“Moment”) and allow to harden for 24 hours. Characteristics of the collimator was not changed.

Example 5. Same as in example 4, only the powder of tungsten to reduce the weight and cost of the collimator pre-mixed material-filler, which take the quartz powder. Characteristics of the collimator was not changed.

Example 6. Same as in example 4, only as a material absorbing x-rays, take powder of metal oxide such as oxide of bismuth, as the filling material take a glass and placed in layers, alternating with layers of oxide of bismuth.

This collimator has a spatial resolution of 0.9 mm at the same focal distance of 10 cm

Example 7. Same as example 6, only as a material absorbing x-rays, take a powder, salt, e.g. the sodium tungstate, as the filling material take polymer (polymethylmethacrylate). This collimator has a spatial resolution of 0.9 mm at the same focal distance of 10 cm

Example 8. The tungsten powder (particle size 5 μm) was added in photopolymerizable composition (NETTL-1) in an amount of 10 wt%. The resulting mixture layers was treated with a focused laser beam (wavelength 254 nm). The thickness of the treated layer (a layer to be processed in one step) was 80 μm. Scan (deployment) of the beam was organized so that the photopolymerization of a mixture has not occurred in the areas of future channels for the passage of radiation. Layer-by-layer processing (step by step) continued to receive the finished product. Unpolymerized portion of the mixture washed away from the product with acetone, the product was dried at 80°C for 30 minutes. This collimator has a spatial resolution of 0.9 mm when the focal length of 12 see

As can be seen from the above examples, the inventive method allows easy and cheap to produce collimators, not inferior in its characteristics known from modern technology, i.e. considerably simplified manufacturing technology, increased resolution, improved performance (by reducing the weight of the collimator), decreases the value.

1. JV is a method for manufacturing a collimator, including the use of layer-by-layer cross-linking of the molecules photopolymerizable composition with a focused optical radiation to perform spatially restricted path of x-rays, located in the volume of absorbing x-ray radiation material, characterized in that the pre photopolymerizable composition additionally add material that absorbs x-ray radiation, and photochemically sew the volume of the collimator, in addition to ways of passing x-ray radiation.

2. A method of manufacturing a collimator according to claim 1, characterized in that it is not sewn part photopolymerizable composition are removed.

3. A method of manufacturing a collimator according to claim 1, characterized in that the material absorbing x-rays, taken in the form of a chemical element and its oxide, salts thereof and/or mixtures thereof.



 

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FIELD: optics.

SUBSTANCE: proposed process includes layer-by-layer cross-linking of photopolymerizing molecules by means of focused optical radiation to produce spatially confined X-ray passages disposed within X-ray absorbing material. To this end X-ray absorbing material is added in advance to photopolymerized material, and collimator space, except for X-ray passages, is cross-linked using photochemical method.

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3 cl

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