Charged Particle Tomography for Low-Dose Anatomical Imaging
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Solution Overview
Problem
Current medical imaging modalities like CT scans and MRI face challenges with high radiation doses and high costs, limited material differentiation, and safety concerns, particularly for sensitive populations such as children and pregnant women.
Innovation Solution
The development of charged particle tomography systems that use proton and electron beams for anatomical imaging, which measure scattering and energy loss to generate three-dimensional images with low radiation doses and reduced costs, utilizing dual-head charged particle scanners and processing units to track and reconstruct particle trajectories.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional CT scans are used for anatomical imaging, then imaging capability is provided, but radiation dose is high
Solution Approach 1:
The patent changes the fundamental parameter of the imaging probe from photons (X-rays) to charged particles (protons or electrons). This parameter change enables material differentiation through multiple interaction mechanisms (Coulomb scattering, energy loss, stopping power) that provide complementary information to traditional attenuation-based CT, achieving better material differentiation while using lower radiation doses.
Solution Approach 2:
The patent introduces charged particles as an intermediary substance between the X-ray source and detector. These charged particles interact with tissue through multiple physical mechanisms (Coulomb scattering off nuclei, energy loss through electron interactions) that provide additional material characterization information beyond simple attenuation, enabling differentiation of materials with similar X-ray attenuation properties.
2Object-affected harmful factors
If traditional MRI is used for anatomical imaging, then soft tissue imaging capability is provided, but cost is high
Solution Approach 1:
The patent replaces the complex electromagnetic field system used in MRI with a simpler charged particle beam system. Instead of using large superconducting magnets and radiofrequency coils to manipulate nuclear spins, the system uses charged particles whose trajectories and energy losses are governed by well-understood electromagnetic interactions, potentially reducing system complexity and cost while maintaining material differentiation capability.
3Measurement precision
If charged particle tomography is used for anatomical imaging, then material differentiation capability is improved, but device complexity increases
Solution Approach 1:
The patent segments the detection task into multiple independent measurement channels: one detector measures Coulomb scattering angles (providing nuclear density information), another measures energy loss (providing electron density information), and a third measures stopping power. This segmentation allows each detector to be optimized for its specific measurement function, simplifying the overall system architecture while achieving comprehensive material differentiation.
4Object-affected harmful factors
If charged particle tomography is used for anatomical imaging, then radiation safety is improved, but imaging resolution may be affected
Solution Approach 1:
The patent uses continuous charged particle beams rather than pulsed X-rays or intermittent MRI sequences. The charged particles continuously interact with tissue along their trajectories, providing ongoing measurement data that can be accumulated to improve signal-to-noise ratio and image resolution. This continuous action enables high-resolution imaging while maintaining lower peak radiation doses compared to traditional CT.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides high-resolution, low-radiation, and cost-effective 3D imaging capable of differentiating materials, reducing radiation exposure risks and operational costs compared to traditional methods, while being safer for sensitive populations.
Implementation Method 1
As a charged particle moves through material, Coulomb charges of nuclei of the material generate multiple Coulomb scattering, perturbing its trajectory. The total deflection depends on several material properties, but the dominant effects are the atomic number, Z, of nuclei and the density of the material.
Implementation Method 2
Additionally, the charged particle loses energy through various interactions with the electrons in the material. This energy loss depends on several material properties, but the dominant effects are density and electron cloud properties of the material.
Implementation Method 3
The scattering and energy loss of multiple charged particles can be measured and processed to probe the properties of these objects. These properties can be analyzed to permit differentiation of materials.
Data Source
AI summary
Methods, systems, and devices are disclosed for charged particle tomography imaging. In one aspect, a system includes a charged particle tomography scanner (CPTS) unit to detect individual charged particles of an emitted charged particle beam delivered to a subject by a charged particle delivery (CPD) system, and a processing unit to determine the angular trajectory change (scattering) and energy loss of the charged particle beam based on detected trajectory information and produce an anatomical image. The CPTS unit includes two detectors, one positioned between the subject and the CPD system, and the other detector positioned opposite to the first detector to detect the trajectory information of the individual charged particles of the charged particle beam having passed through the first detector and the subject, and a motion control unit to move the detectors, in which the detectors' size covers an area at least that of the beam's cross-section.