Artificial intelligence based 3d reconstruction

An apparatus for producing a trained machine learning model, the apparatus comprising:

• processing circuitry configured to:
• generate, based on 3D training data of an object acquired by using a first radiation imaging apparatus, simulated projection data representative of when the object is imaged by a second radiation apparatus;
• and
• train an untrained machine learning model to produce the trained machine learning model by using the simulated projection data.

A method of processing target image data of a first object acquired by a first radiation apparatus, the method comprising:

• receiving a trained machine learning model generated by:
• generating, based on 3D training data of a second object acquired by using a second radiation imaging apparatus, simulated projection data representative of when the second object is imaged by the first radiation apparatus, and
• applying a training process to an untrained machine learning model to produce the trained machine learning model by using the simulated projection data;
• and
• applying the target image data to the trained machine learning model.

An apparatus for processing target image data of a first object acquired by a first radiation apparatus, the apparatus comprising:

• processing circuitry configured to:
• receive a trained machine learning model generated by:
• generating, based on 3D training data of a second object acquired by using a second radiation imaging apparatus, simulated projection data representative of when the second object is imaged by the first radiation apparatus, and
• applying a training process to an untrained machine learning model to produce the trained machine learning model by using the simulated projection data;
• and
• apply the target image data to the trained machine learning model.