Charged particle tomography with improved momentum estimation

A computer program product, embodied on a non-transitory computer readable medium, the computer program product comprising:

• program code for obtaining charged particle tomographic data corresponding to scattering angles of charged particles passing through an object volume at one or more charged particle position detectors;
• program code for determining a distribution of scattering angles associated with the charged particles, using measured data collected from the one or more position detectors, based on deviations of local trajectories of the charged particles in one or more planes relative to a reference trajectory;
• program code for determining a length of the scattering material based on the characteristics of the one or more position detectors and the charged particles' angle of incidence on the one or more position detectors;
• and
• program code for obtaining charged particle momentum estimates based on the determined distribution of scattering angles and the length of the scattering material.

A device, comprising:

• a processor comprising electronic circuits;
• and
• a memory comprising processor executable code, the processor executable code, when executed by the process configures the device to:
• obtain charged particle tomographic data corresponding to scattering angles of charged particles passing through an object volume at one or more charged particle position detectors;
• determine a distribution of scattering angles associated with the charged particles, using measured data collected from the one or more position detectors, based on deviations of local trajectories of the charged particles in one or more planes relative to a reference trajectory;
• determine a length of the scattering material based on the characteristics of the one or more position detectors and the charged particles' angle of incidence on the one or more position detectors;
• and
• obtain charged particle momentum estimates based on the determined distribution of scattering angles and the length of the scattering material.

A system for measuring momentum of charged particles from charged particle tomographic data, comprising:

• a first set of position detector located on a first side of an object volume to measure positions and angles of incident charged particles towards the object volume;
• a second set of position sensitive detectors located on a second side of the object volume to measure positions and angles of outgoing charged particles exiting the object volume;
• and
• a signal processing unit coupled to the first set of position detectors and to the second set of position detectors to receive data of measured signals from the first set of position detectors and measured signals from the second set of position detectors, the signal processing unit to:
• determine a distribution of scattering angles associated with the charged particles, using measured data collected from the one or more position detectors, based on deviations of local trajectories of the charged particles in one or more planes relative to a reference trajectory;
• determine a length of the scattering material based on the characteristics of the first or the second set of position detectors and the charged particles' angle of incidence on the first or the second set of position detectors;
• and
• obtain charged particle momentum estimates based on the determined distribution of scattering angles and the length of the scattering material.