Background correction for computed tomography scan data

Patent metadata

Field	Value
Publication number	US-10169888-B2
Application number	US-201615179808-A
Country	US
Kind code	B2
Filing date	Jun 10, 2016
Priority date	Dec 11, 2015
Publication date	Jan 1, 2019
Grant date	Jan 1, 2019

Abstract

A background correction method for CT scan data is provided. A background collection may be performed to collect a first background data set and background data before a CT scan. The CT scan may then be performed to collect one or more CT scan data sets, and status information for collecting each of the CT scan data sets. A second background collection may additionally be performed to collect a second background data set after the CT scan, and status information for collecting the second background data set may also be recorded. The first background data set, the second background data set and corresponding status information may then be used to obtain a background data set for collecting each of the CT scan data sets. The corresponding background data set may be removed from each of the CT scan data set to obtain a background-corrected CT scan data set.

First claim

The invention claimed is:

1. A background correction method for CT scan data, the method comprising:
performing a first background collection to collect a first background data set before X-rays are emitted to start a CT scan, and recording status information corresponding to the first background data set, wherein the status information comprises a time;
performing the CT scan to collect one or more CT scan data sets, and recording status information corresponding to each of the CT scan data sets;
performing a second background collection to collect a second background data set after completing the CT scan when the X-rays are not emitted, and recording status information corresponding to the second background data set;
performing a time-based interpolation operation to obtain a background data set corresponding to each of the collected CT scan data sets by using the first background data set and the second background data set, comprising:

DataBack
⁡

(
j
)

=

Time
Xray
j

-

Time
Back
1

Time
Back
2

-

Time
Back
1

*
DataBack
⁢

⁢
2

+

Time
Back
2

-

Time
Xray
j

Time
Back
2

-

Time
Back
1

*
DataBack
⁢

⁢
1

;

wherein DataBack(j) represents the background data set corresponding to a j-th CT scan data set DataScan(j) collected during the CT scan, j=1:M, and M represents a number of the CT scan data sets collected during the CT scan;
Time Xray j represents a time for collecting the j-th CT scan data set DataScan(j);
DataBack 1 represents the first background data set;
Time Back 1 represents a time for collecting the first background data set DataBack 1 ;
DataBack 2 represents the second background data set; and
Time Back 2 represents a time for collecting the second background data set DataBack 2 ; and
removing the background data set corresponding to each of the collected CT scan data sets from each of the collected CT scan data sets to obtain a background-corrected CT scan data set.

2. The method according to claim 1 , wherein said removing the background data set corresponding to each of the collected CT scan data sets from each of the collected CT scan data sets to obtain the background-corrected CT scan data set comprises:
subtracting the background data set corresponding to each of the collected CT scan data sets from each of the collected CT scan data sets:
DataScan( j ) corrected =DataScan( j )−DataBack( j );

wherein DataScan(j) represents a j-th CT scan data set collected during the CT scan, j=1:M, and M represents a number of the CT scan data sets collected during the CT scan;
DataBack(j) represents the background data set corresponding to the j-th CT scan data set DataScan(j) collected during the CT scan; and
DataScan(j) corrected represents a j-th background-corrected CT scan data set collected during the CT scan.

3. A background correction device for CT scan data, the device comprising:
a processor which invokes machine readable instructions corresponding to a control logic for CT scan data background correction stored on a storage medium and executes the machine readable instructions to perform the background correction method for CT scan data according to claim 1 .

4. A background correction method for CT scan data, the method comprising:
performing a first background collection to collect a first background data set before X-rays are emitted to start a CT scan, and recording status information corresponding to the first background data set, wherein the status information comprises a temperature of a detector component;
performing the CT scan to collect one or more CT scan data sets, and recording status information corresponding to each of the CT scan data sets;
performing a second background collection to collect a second background data set after completing the CT scan when the X-rays are not emitted, and recording status information corresponding to the second background data set;
performing a detector-component-temperature-based interpolation operation to obtain a background data set corresponding to each of the collected CT scan data sets by using the first background data set and the second background data set, comprising:

DataBack
⁡

(
j
)

=

Temp
Xray
j

⁡

(
i
)

-

Temp
Back
1

⁡

(
i
)

Temp
Back
2

Assignees

• Shenyang Neusoft Medical Sys

Inventors

• Lou Shanshan
• Zhao Jiangwei

Classifications

• G06T12/10 Primary

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

• A61B6/5205

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

• A61B6/488

  involving pre-scan acquisition · CPC title

• A61B6/5258

  involving detection or reduction of artifacts or noise · CPC title

• A61B6/032

  Transmission computed tomography [CT] · CPC title