Method and apparatus for generating a combined parameter map

• US 20030223628A1
• Filed: 06/04/2003
• Published: 12/04/2003
• Est. Priority Date: 06/04/2002
• Status: Active Grant

• Current Assignee: Siemens Healthineers AG (Siemens AG)
• Original Assignee: Siemens AG
• Inventors: Meyer, Heiko
• Granted Patent: US 7,280,681 B2
• Time in Patent Office: Days
• US Class Current: 382/128
• CPC Class Codes: G06T 15/08 Volume rendering

Abstract

In a method and apparatus for generating a combined parameter map from a number of individual, initial parameter maps that contain values of various parameters dependent on the position (x, y), for each of the initial parameter maps and for each position, the signal value of the parameter at the appertaining position is converted into a first color value according to a first transfer function specifically defined for the respective parameter. Subsequently, the first color values are respectively converted into color code intensity values on the basis of a second transfer function. The color code intensity values of the individual parameters are then operated to form a combined intensity value. Finally, the combined intensity value is converted with a third transfer function into a color value at the appertaining position in the parameter map.

Claims

1. A method for generating a combined parameter map, representing respective values of a combined parameter at all coordinate positions in said combined parameter map, from a plurality of initial parameter maps respectively containing values of individual parameters at respective coordinate positions in the respective initial parameter maps corresponding to said coordinate positions in said combined parameter map, comprising the steps of, for each of said initial parameter maps and for each of said coordinate positions:

defining a first transfer function for a parameter in one of the initial parameter maps and converting a value of said parameter in said one of said initial parameter maps into a first color value using said first transfer function;

converting said first color value into a color code intensity value using a second transfer function;

operating on all color intensity values of the respective individual parameters in the respective initial parameter maps at each of said coordinate positions, to form a combined intensity value for that coordinate position; and

converting said combined intensity value into a color code value, using a third transfer function, at each of said coordinate positions in said parameter maps.

2. A method as claimed in claim 1 comprising using an identical second transfer function for all individual parameters in all of said initial parameter maps.

3. A method as claimed in claim 1 wherein the step of operating on said color code intensity values to form said combined intensity value comprises forming an average of the respective color code intensity values for each individual parameter in the respective initial parameter maps.

4. A method as claimed in claim 1 wherein the step of operating on said color code intensity values to form said combined intensity value comprises the steps of:

for each individual parameter, defining a weighting coefficient; and

operating on the color code intensity values with the respective weighting coefficients to form said combined intensity value.

5. A method as claimed in claim 1 wherein the step of defining said first transfer function for each individual parameter comprises assigning the value of the individual parameter in the respective initial parameter map a color value dependent on a value range of said value of said individual parameter in the respective initial parameter map.

6. A method as claimed in claim 5 comprising assigning specific color values to specific values of the individual parameter in the initial parameter map, and automatically allocating further values of said individual parameter in the respective initial parameter map, lying between said specific values, to further color values lying between said specific color values.

7. A method as claimed in claim 6 comprising assigning said further color values by interpolation.

8. A method as claimed in claim 5 wherein each individual parameter has an overall value range, and comprising dividing said overall value range into a plurality of sections, and in each of said sections, differently defining said first transfer function for assigning said color value.

9. A method as claimed in claim 8 comprising assigning the respective color values to the values of the individual parameters within said value range using a graphic user interface by displaying a color curve corresponding to said overall value range.

10. A method as claimed in claim 9 comprising displaying said color curve proceeding through a plurality of different color regions, respectively corresponding to said sections.

11. A method as claimed in claim 10 comprising allowing modification, via said graphic user interface, of at least one of said color curve and the value ranges respectively corresponding to said sections.

12. An apparatus for generating a combined parameter map, representing respective values of a combined parameter at all coordinate positions in said combined parameter map, from a plurality of initial parameter maps respectively containing values of individual parameters at respective coordinate positions in the respective initial parameter maps corresponding to said coordinate positions in said combined parameter map, comprising:

a first transfer module for converting a value of a parameter in each of said initial parameter maps at each coordinate position into a first color value using a first transfer function define for that parameter;

a second transfer module for converting said first color value at each coordinate position into a color code intensity value using a second transfer function;

an operation unit for operating on all color intensity values of the respective individual parameters in the respective initial parameter maps at each of said coordinate positions, to form a combined intensity value for that coordinate position; and

a third transfer module for converting said combined intensity value into a color code value, using a third transfer function, at each of said coordinate positions in said parameter maps.

13. An apparatus as claimed in claim 12 wherein said second transfer module using an identical second transfer function for all individual parameters in all of said initial parameter maps.

14. An apparatus as claimed in claim 12 wherein said operating unit operates on said color code intensity values to form said combined intensity value by forming an average of the respective color code intensity values for each individual parameter in the respective initial parameter maps.

15. An apparatus as claimed in claim 12 wherein said operation unit operates on said color code intensity values to form said combined intensity value by, for each individual parameter, defining a weighting coefficient, and operating on the color code intensity values with the respective weighting coefficients to form said combined intensity value.

16. An apparatus as claimed in claim 12 wherein an allocation unit for defining said first transfer function for each individual parameter by assigning the value of the individual parameter in the respective initial parameter map a color value dependent on a value range of said value of said individual parameter in the respective initial parameter map.

17. An apparatus as claimed in claim 16 wherein said allocation unit comprises an input unit for assigning specific color values to specific values of the individual parameter in the initial parameter map, and wherein said allocation unit automatically allocates further values of said individual parameter in the respective initial parameter map, lying between said specific values, to further color values lying between said specific color values.

18. An apparatus as claimed in claim 17 wherein said allocation unit assigns said further color values by interpolation.

19. An apparatus as claimed in claim 16 wherein each individual parameter has an overall value range, and wherein said allocation unit comprises a graphic user interface for displaying a color curve corresponding to said overall value range, and wherein said input unit allows interaction divide said overall value range into a plurality of sections, and in each of said sections, differently defining said first transfer function for assigning said color value.

20. An apparatus as claimed in claim 19 wherein said graphic user interface displays said color curve proceeding through a plurality of different color regions, respectively corresponding to said sections.

21. An apparatus as claimed in claim 20 wherein said input unit allows modification, on said graphic user interface, of at least one of said color curve and the value ranges respectively corresponding to said sections.

22. An imaging system comprising:

an image acquisition device adapted to interact with a subject to obtain a plurality of images of the subject; and

an evaluation device for generating a combined parameter map, representing respective values of a combined parameter at all coordinate positions in said combined parameter map, from a plurality of initial parameter maps respectively obtained from said images containing values of individual parameters at respective coordinate positions in the respective initial parameter maps corresponding to said coordinate positions in said combined parameter map, said evaluation device comprising;

a first transfer module for converting a value of a parameter in each of said initial parameter maps at each coordinate position into a first color value using a first transfer function define for that parameter;

a second transfer module for converting said first color value at each coordinate position into a color code intensity value using a second transfer function;

an operation unit for operating on all color intensity values of the respective individual parameters in the respective initial parameter maps at each of said coordinate positions, to form a combined intensity value for that coordinate position; and

a third transfer module for converting said combined intensity value into a color code value, using a third transfer function, at each of said coordinate positions in said parameter maps.