Method for a positioning control of an object under investigation before acquiring a projective x-ray image

1 . A computer-implemented method for position control of an object under investigation before acquiring a projective X-ray image of a region of interest, the computer-implemented method comprising:

receiving object information for the object under investigation in an examination pose;

retrieving an object model relating to the examination pose and the region of interest;

adapting the object model to the object under investigation based on the object information; and

evaluating the examination pose based on the adapted object model, wherein

the adapted object model is defined by object model parameters, and

based on the object model parameters, a reference object model is selected from a plurality of reference object models with assigned positioning deviations relative to a standard examination pose for a respective examination type for the region of interest.

2 . The computer-implemented method according to claim 1 , wherein the object information is determined based on an image of a surface of the object under investigation.

3 . The computer-implemented method according to claim 1 , wherein the object information is determined based on an X-ray image.

4 . The computer-implemented method according to claim 1 , wherein the object model is adapted using a surface transformation function based on the object information.

5 . The computer-implemented method according to claim 4 , wherein surface transformation function is a rigid registration function or a non-rigid registration function.

6 . The computer-implemented method according to claim 1 , wherein the object model further relates to at least one descriptive parameter of the object information.

7 . The computer-implemented method according to claim 1 , further comprising:

generating an output in response to the assigned positioning deviation of the reference object model exceeding a threshold.

8 . The computer-implemented method according to claim 7 , wherein the output is a proposal for an improved examination pose which is determined based on an individual parameter of the object under investigation.

9 . The computer-implemented method according to claim 8 , wherein the individual parameter includes individual restrictions of mobility or individual restrictions due to pain associated with an examination pose.

10 . The computer-implemented method according to claim 2 , wherein the object information is determined based on an X-ray image.

11 . The computer-implemented method according to claim 10 , wherein the object model is adapted using a surface transformation function based on the object information.

12 . The computer-implemented method of claim 1 , wherein the standard examination pose is an ideal standard examination pose.

13 . A method to create a set of reference object models for at least one examination pose and at least one region of interest, the set of reference object models configured for inclusion in the computer-implemented method of claim 1 , the method comprising:

providing a plurality of different object models including at least one landmark for a corresponding region of interest;

adapting the plurality of different object models to the at least one examination pose to generate reference object models;

generating, for each reference object model, a forward projection of the at least one landmark comprised by the reference object model in an X-ray geometry relating to the examination pose and the region of interest;

providing the plurality of different object models in a standard examination pose;

generating a forward projection of the at least one landmark comprised by an object model in the standard examination pose in the X-ray geometry relating to the examination pose and the region of interest; and

determining a positioning deviation by comparing the forward projection of the reference object model to a forward projection of a corresponding object model in the standard examination pose.

14 . A medical X-ray system comprising:

a first interface configured to receive object information of an object under investigation in an examination pose;

a second interface configured to retrieve an object model relating to the examination pose and a region of interest;

a third interface configured to adapt the object model to the object under investigation based on the object information; and

a fourth interface configured to evaluate the examination pose based on the adapted object model, wherein

the adapted object model is defined by object model parameters, and

based on the object model parameters, a reference object model is selected from a plurality of reference object models with assigned positioning deviations relative to a standard examination pose for a respective examination type for the region of interest.

15 . A non-transitory computer-readable medium storing a computer program product comprising instructions that, when executed by a computer, cause the computer to carry out the computer-implemented method of claim 2 .

16 . A non-transitory computer-readable medium comprising instructions that, when executed by a computer, cause the computer to carry out the computer-implemented method of claim 1 .

17 . A medical X-ray system comprising:

a memory storing computer executable instructions; and

at least one processor configured to execute the computer executable instructions to cause the medical X-ray system to

receive object information of an object under investigation in an examination pose,

retrieve an object model relating to the examination pose and a region of interest,

adapt the object model to the object under investigation based on the object information, and

evaluate the examination pose based on the adapted object model, wherein

the adapted object model is defined by object model parameters, and

based on the object model parameters, a reference object model is selected from a plurality of reference object models with assigned positioning deviations relative to a standard examination pose for a respective examination type for the region of interest.