Materialise has filed a patent for a system that calibrates X-ray images. The system receives an X-ray image and a 3-D surface scan of the patient’s body. It then derives a measurement correction based on the surface scan, accounting for factors such as patient orientation and distances between the patient, detector plate, and X-ray source. The system determines a corrected measurement of the anatomical part based on this correction. GlobalData’s report on Materialise gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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Calibrating x-ray images using 3-d surface scans
A recently filed patent (Publication Number: US20230263498A1) describes a system for calibrating X-ray images. The system includes at least one memory and at least one processor. The processor is configured to receive an X-ray image of an anatomical part of a patient and a 3-D surface scan of the corresponding portion of the patient. Based on the 3-D surface scan, the processor derives a measurement correction for the X-ray image. This correction takes into account factors such as the orientation of the patient with respect to the detector plate used to capture the X-ray image, the distance between the patient and the detector plate, and the distance between the patient and the X-ray source used to generate the image. The processor then determines a corrected measurement of the anatomical part based on the measurement correction and the measurement taken from the X-ray image.
To derive the measurement correction, the processor may derive the distances between the patient and the detector plate or the X-ray source based on the 3-D surface scan. It can also obtain the distance between the X-ray source and the detector plate and calculate a scaling factor using these distances. The processor can locate a region in the 3-D surface scan, such as an anatomical landmark, to calculate the distances. Alternatively, it can fit a statistical shape model (SSM) to the 3-D surface scan, resulting in a 3D model corresponding to the anatomical part, and calculate the distances based on a region of the 3D model.
The system can also determine the orientation of the patient based on the 3-D surface scan or the 3D model derived from the scan. Additionally, the processor can generate a patient-specific surgical design based on the corrected measurement. This design can be manufactured using additive manufacturing techniques.
In summary, the patent describes a system and method for calibrating X-ray images by using a 3-D surface scan of the patient. The system derives a measurement correction based on factors such as patient orientation and distances between the patient, the detector plate, and the X-ray source. This allows for more accurate measurements of anatomical parts in X-ray images and enables the generation of patient-specific surgical designs.
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