Dose modulated X-ray scanning

Patent metadata

Field	Value
Publication number	US-9836825-B2
Application number	US-201514843754-A
Country	US
Kind code	B2
Filing date	Sep 2, 2015
Priority date	Sep 2, 2014
Publication date	Dec 5, 2017
Grant date	Dec 5, 2017

Abstract

A method and a device for dose modulated X-ray scanning, where, according to an example of the method, a theoretical X-ray scanning dose for a scanning region may be calculated according to a target image quality standard set for the scanning region and a reference data level determined for the scanning region. Then, an X-ray attenuation difference between each data level corresponding to the scanning region and the reference data level may be calculated according to the theoretical X-ray scanning dose. In this way, a data level where the X-ray attenuation difference with the reference data level is higher than a threshold may be selected out from the data levels corresponding to the scanning region as a target to be de-noised, and a noise reduction may be performed for the target to be de-noised.

First claim

The invention claimed is:

1. A method for dose modulated X-ray scanning, the method comprising:
setting a target image quality standard for a scanning region;
determining a reference data level for the scanning region;
calculating a theoretical X-ray scanning dose for the scanning region, according to the target image quality standard and the reference data level;
calculating an X-ray attenuation difference between each data level corresponding to the scanning region and the reference data level, according to the theoretical X-ray scanning dose;
identifying any one of the data levels corresponding to the scanning region, whose X-ray attenuation difference with the reference data level is higher than a threshold, as a target to be de-noised; and
performing a noise reduction for the target to be de-noised.

2. The method according to claim 1 , wherein said calculating a theoretical X-ray scanning dose for the scanning region comprises:
calculating a reference X-ray scanning dose for the reference data level, according to the target image quality standard; and
calculating the theoretical X-ray scanning dose for the scanning region, according to a reference X-ray scanning dose and a number of the data levels corresponding to the scanning region.

3. The method according to claim 1 , wherein said calculating the X-ray attenuation differences between each data level corresponding to the scanning region and the reference data level comprises:
calculating X-ray attenuation diameters in an equivalent water phantom for each data level corresponding to the scanning region according to the theoretical X-ray scanning dose; and
calculating X-ray attenuation diameter differences in the equivalent water phantom between each data level corresponding to the scanning region and the reference data level.

4. The method according to claim 1 , wherein said performing a noise reduction for the target to be de-noised comprises:
obtaining X-ray raw data of the target to be de-noised; and
performing a noise reduction for the target to be de-noised, according to the X-ray raw data, so as to obtain a scanning image in accordance with the target image quality standard.

5. The method according to claim 1 , wherein said performing a noise reduction for the target to be de-noised, comprises:
obtaining a primary scanning image by scanning the scanning region with the theoretical X-ray scanning dose; and
performing a noise reduction for the primary scanning image, according to the target to be de-noised, so as to obtain a scanning image in accordance with the target image quality standard.

6. A device for dose modulated X-ray scanning, the device comprising:
a processor which reads instructions corresponding to a control logic for dose modulated X-ray scanning in a storage medium and executes the instructions to:
set a target image quality standard for a scanning region;
determine a reference data level for the scanning region;
calculate a theoretical X-ray scanning dose for the scanning region, according to the target image quality standard and the reference data level;
calculate an X-ray attenuation difference between each data level corresponding to the scanning region and the reference data level, according to the theoretical X-ray scanning dose;
identify any one of the data levels corresponding to the scanning region, whose X-ray attenuation difference with the reference data level is higher than a threshold, as a target to be de-noised; and
perform a noise reduction for the target to be de-noised.

7. The device according to claim 6 , wherein the instructions further cause the processor to:
calculate a reference X-ray scanning dose for the reference data level, according to the target image quality standard; and
calculate the theoretical X-ray scanning dose for the scanning region, according to the reference X-ray scanning dose and a number of the data levels corresponding to the scanning region.

8. The device according to claim 6 , wherein the instructions further cause the processor to:
calculate an X-ray attenuation diameter in an equivalent water phantom for each data level corresponding to the scanning region, according to the theoretical X-ray scanning dose; and
calculate an X-ray attenuation diameter difference in the equivalent water phantom between each data level corresponding to the scanning region and the reference data level.

9. The device according to claim 6 , wherein the instructions further cause the processor to:
obtain X-ray raw data of the target to be de-noised; and
perform a noise reduction for the target to be de-noised, according to the X-ray raw data, so as to obtain a scanning image in accordance with the target image quality standard.

10. The device according to claim 6 , wherein the instructions further cause the processor to:
obtain a primary scanning image by scanning the scanning region with the theoretical X-ray scanning dose; and
perform a noise reduction for the primary scanning image, according to the target to be de-noised, so as to obtain a scanning image in accordance with the target image quality standard.

Assignees

• Shenyang Neusoft Medical Sys

Inventors

• Lou Shanshan
• Pang Ling

Classifications

• G06T12/10

  Image preprocessing, e.g. calibration, positioning of sources or scatter correction · CPC title

• G06T2207/10081

  Computed x-ray tomography [CT] · CPC title

• A61B6/5258

  involving detection or reduction of artifacts or noise · CPC title

• A61B6/5205

  involving processing of raw data to produce diagnostic data · CPC title

• G06T2207/20192

  Edge enhancement; Edge preservation · CPC title