# US 12,217,883 B1 · Method for assembling an adjustable collimator for spatially fractionated radiation therapy

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- Number: US 12,217,883 B1
- Document ID: US12217883B1
- Status: Granted
- Kind: B1
- Application number: 18/918,325
- Filed: 2024-10-17
- Granted: 2025-02-04
- Earliest claimed: 2024-10-17
- Assignees: Sichuan Cancer Hospital
- Applicants: Sichuan Cancer Hospital
- Inventors: Meihua Chen; Zengyi Fang; Jinyi Lang; Pingjin Zou; Shixuan Zhao
- Web page: https://patentgrep.com/patent/US12217883B1

## CPC

- G21K 1/04: using variable diaphragms, shutters, choppers
- G21K: HANDLING OF PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES

## Abstract

A method for assembling an adjustable collimator for spatially fractionated radiation therapy is disclosed. Penetrating sheets that can transmit rays are stacked to form penetration sections, and the quantity of penetrating sheets is calculated. The thickness of each penetration section corresponds to the width of each radiation area. Shielding sheets that can block rays are stacked to form shielding sections, and the quantity of shielding sheets is calculated, with the thickness of each shielding section corresponding to the spacing between the radiation areas. The penetration sections and shielding sections form a collimation module, with shielding sections on opposite sides. Penetration and shielding sections of different thicknesses are assembled based on the radiation range and the radiation area spacing. Since the thickness of the penetration and shielding sections can be adjusted as needed, it can be applied to spatially fractionated radiation therapy with different requirements, achieving cost reduction.

## Claims

### Claim 1

A method for assembling an adjustable collimator for spatially fractionated radiation therapy, comprising the following steps:
step S1: counting widths of each radiation area and spacing between the radiation areas;
step S2: calculating a number of penetrating sheets that can transmit rays, stacked to form penetration sections, with a thickness of each penetration section corresponding to the width of each radiation area, and calculating a number of shielding sheets that can block rays, stacked to form shielding sections, with a thickness of each shielding section corresponding to the spacing between radiation areas;
step S3: sequentially stacking the penetration sections and the shielding sections to form a collimation module, with shielding sections on opposite sides of the collimation module; and
step S4: compressing the collimation module from the opposite sides to eliminate gaps between the penetration sections, ensuring that a range of rays transmitted through the penetration sections is accurate and reliable, and that a spacing between radiation ranges is precise and reliable, wherein
the step S3 further comprises installing the collimation module using a fixed structure with positioning grooves, where the positioning grooves have a same width as that of the penetrating sheets, and the width of the penetrating sheets is the same as that of the shielding sheets, one end of the positioning grooves has a positioning structure, with an end face of one shielding section of the collimation module resting against the positioning structure; followed by alternating stacking the penetration sections and the shielding sections, with a last stacked section in the positioning groove being one of the shielding sections.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the penetrating sheets have a same thickness or different thicknesses.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the shielding sheets have a same thickness or different thicknesses.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the fixed structure includes two fixed plates, each fixed plate having one of the positioning grooves, and the two fixed plates contact opposite sides of the collimation module through the positioning grooves.

### Claim 5 (depends on 1)

The method according to claim 1, wherein in step S4, the collimation module is compressed using a compressive structure that can slide with respect to the fixed structure, and the compressive structure fits tightly with the fixed structure.

### Claim 6 (depends on 5)

The method according to claim 5, wherein the positioning structure is slidably connected to the fixed structure, and the positioning structure fits tightly with the fixed structure.

### Claim 7 (depends on 6)

The method according to claim 6, wherein both the positioning structure and the compressive structure comprise a latch, where the latch includes a sliding groove, and the latch slidably connects to the fixed structure through the sliding groove.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the thickness of the penetrating sheets is 200-1000 μm;
the thickness of the shielding sheets is 200-1000 μm; and
the penetrating sheets comprise polylactic acid and are made by 3D printing.