# US 2019/0170894 A1 · Scan method, scan system and radiation scan controller

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- Number: US 2019/0170894 A1
- Document ID: US20190170894A1
- Status: Published application
- Kind: A1
- Application number: 16/253,221
- Filed: 2019-01-22
- Published: 2019-06-06
- Earliest claimed: 2015-12-23
- Assignees: Nuctech Company Limited; Tsinghua University
- Applicants: Nuctech Company Limited; Tsinghua University
- Inventors: Kejun KANG; Yaohong LIU; Ziran ZHAO; Wei JIA; Jianping GU; Chuanxiang TANG; Huaibi CHEN; Jianjun GAO; Wei YIN; Xiying LIU
- Web page: https://patentgrep.com/patent/US20190170894A1

## CPC

- G01V 5/22: Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays
- G01N 23/04: and forming images of the material
- G01T 1/29: Measurement performed on radiation beams, e.g. position or section of the beam; Measurement of spatial distribution of radiation
- G01V: GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS (means for indicating the location of accidentally buried, e.g. snow-buried, persons A63B29/02)
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)
- G01T: MEASUREMENT OF NUCLEAR OR X-RADIATION (radiation analysis of materials, mass spectrometry G01N23/00; tubes for determining the presence, intensity, density or energy of radiation or particles H01J47/00)

## Abstract

This invention provides a scan method, scan system and radiation scan controller, and relates to the field of radiation. The scanning method includes obtaining detection data of an object to be inspected under radiation scanning using a detector, adjusting an accelerator output beam dose rate and/or an output electron beam energy level of a radiation emission device according to the detection data. With this method, working conditions of the accelerator of the radiation emission device may be adjusted according to the detection data detected by the detector, so that for a region having a larger mass thickness, a higher output beam dose rate or a higher electron beam output energy level is adopted to guarantee satisfied imaging technical indexes, for a region having a smaller mass thickness, a lower output beam dose rate or a lower electron beam output energy level is adopted to reduce the environmental dose level while guaranteeing satisfied imaging technical indexes.

## Claims

### Claim 1

A scanning method, comprising:
acquiring initial transparency information according to detection data of an object to be inspected acquired under radiation scanning by a detector;
correcting the initial transparency information according to a background image and an air image to obtain the transparency information; and
adjusting an accelerator output beam dose rate and/or an output electron beam energy level of a radiation emission device according to the detection data.

### Claim 2 (depends on 1)

The method according to claim 1, wherein adjusting an accelerator output beam dose rate and/or an output electron beam energy level of a radiation emission device according to the detection data comprises:
during a movement of the object to be inspected relative to the radiation emission device and the detector, adjusting an accelerator output beam dose rate and/or an output electron beam energy level of a radiation emission device according to real-time detection data obtained by the detector from a scanning region of the object to be inspected.

### Claim 3 (depends on 1)

The method according to claim 1, wherein adjusting an accelerator output beam dose rate and/or an output electron beam energy level of a radiation emission device according to the detection data comprises:
acquiring overall scanning data of the object to be inspected using the detector;
analyzing the overall scanning data to determine a main scanning region of the object to be inspected, wherein the main scanning region comprises a low penetration region or a region suspected to be a contraband item;
determine an accelerator output beam dose rate and/or an output electron beam energy level according to detection data of the main scanning region, to scan the main scanning region.

### Claim 4 (depends on 2)

The method according to claim 2, wherein the detection data is transparency information of the object to be inspected;
adjusting an accelerator output beam dose rate and/or an output electron beam energy level of a radiation emission device according to the detection data comprises:
comparing the transparency information with a predetermined transparency threshold value;
if the transparency information is below a predetermined lower transparency threshold value, increasing the accelerator output beam dose rate and/or the output electron beam energy level; and
if the transparency information is above a predetermined upper transparency threshold value, decreasing the accelerator output beam dose rate and/or the output electron beam energy level.

### Claim 5 (depends on 2)

The method according to claim 2, wherein adjusting an accelerator output beam dose rate and/or an output electron beam energy level of a radiation emission device according to the detection data comprises:
determining an ideal output beam dose rate and/or an ideal output electron beam energy level according to a conversion policy for converting the detection data to the ideal accelerator output beam dose rate and/or the ideal output electron beam energy level; and
adjusting the accelerator output beam dose rate and/or the output electron beam energy level to the ideal output beam dose rate and/or the ideal output electron beam energy level.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the accelerator of the radiation emission device comprises multiple output beam dose rate levels and/or multiple output electron beam energy levels, each level having a fixed output beam dose rate and/or a fixed output electron beam energy value;
adjusting an accelerator output beam dose rate and/or an output electron beam energy level of a radiation emission device according to the detection data comprises:
adjusting the accelerator output beam dose rate and/or the output electron beam energy level of the radiation emission device to a certain level according to the detection data.

### Claim 7

A radiation scan controller, characterized in comprising:
a data acquisition module for acquiring initial transparency information according to detection data of an object to be inspected acquired under radiation scanning by a detector; correcting the initial transparency information according to a background image and an air image to obtain the transparency information; and
an adjustment module for adjusting an accelerator output beam dose rate and/or an output electron beam energy level of a radiation emission device according to the detection data.

### Claim 8 (depends on 11)

The controller according to claim 11, wherein the adjustment module is further used for:
during a movement of the object to be inspected relative to the radiation emission device and the detector, adjusting an accelerator output beam dose rate and/or an output electron beam energy level of a radiation emission device according to real-time detection data obtained by the detector from a scanning region of the object to be inspected.

### Claim 9 (depends on 11)

The controller according to claim 11, wherein the adjustment module is further used for:
acquire overall scanning data of the object to be inspected;
analyzing the overall scanning data to determine a main scanning region of the object to be inspected, wherein the main scanning region comprises a low penetration region or a region suspected to be a contraband item; and
determine an accelerator output beam dose rate and/or an output electron beam energy level according to detection data of the main scanning region, to scan the main scanning region.

### Claim 10 (depends on 12)

The controller according to claim 12, wherein the detection data is transparency information of the object to be inspected;
the adjustment module further comprises:
a comparison unit for comparing the transparency information with a predetermined transparency threshold value; and
an emission adjustment unit for, if the transparency information is below a predetermined lower transparency threshold value, increasing the accelerator output beam dose rate and/or the output electron beam energy level; if the transparency information is above a predetermined upper transparency threshold value, decreasing the accelerator output beam dose rate and/or the output electron beam energy level.

### Claim 11 (depends on 12)

The controller according to claim 12, wherein the adjustment module further comprises:
an ideal value determination unit for determining an ideal output beam dose rate and/or an ideal output electron beam energy level according to a conversion policy for converting the detection data to the ideal accelerator output beam dose rate and/or the ideal output electron beam energy level; and
an emission adjustment unit for adjusting the accelerator output beam dose rate and/or the output electron beam energy level to the ideal output beam dose rate and/or the ideal output electron beam energy level.

### Claim 12 (depends on 11)

The controller according to claim 11, wherein the accelerator of the radiation emission device comprises multiple output beam dose rate levels and/or multiple output electron beam energy levels, each level having a fixed output beam dose rate and/or a fixed output electron beam energy value; and
the adjustment module is further used to adjust the accelerator output beam dose rate and/or the output electron beam energy level of the radiation emission device to a certain level according to the detection data.

### Claim 13 (depends on 11)

A scanning system, comprising:
a controller of claim 11;
a detector; and
a radiation emitter;
wherein the detector is used to send detection data to the controller;
the controller is used to send control information to the radiation emitter for adjusting an accelerator output beam dose rate and/or an output electron beam energy level of the radiation emission device according to the detection data; and
the radiation emitter is used for emitting radiation; adjusting an accelerator output beam dose rate and/or an output electron beam energy level of a radiation emission device according to the detection data.