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Patient monitor

  • US 10,154,803 B2
  • Filed: 04/16/2015
  • Issued: 12/18/2018
  • Est. Priority Date: 09/05/2006
  • Status: Active Grant
First Claim
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1. A radio therapy device, comprising:

  • a treatment apparatus for applying radiation to a patient, anda patient monitor, the patient monitor including;

    a 3D position determination module operable to determine measurements indicative of positions of at least part of a patient undergoing radiotherapy;

    a clock module operable to associate measurements indicative of positions of at least part of a patient determined by the 3D position determination module with timing data;

    a model generation module operable to (1) use obtained position and timing data for a plurality of breathing cycles obtained from the 3D position determination module and clock module to generate a component analysis model of the variation in position of at least part of a patient during the plurality of breathing cycles, and (2) model a representation of further position and timing data obtained from the 3D position determination module and clock module during a subsequent period of breathing using the component analysis model; and

    a comparison module operable to calculate a Mahalanobis distance between the modeled representation of the further position and timing data and a mean representation of the generated component analysis model, and compare the calculated Mahalanobis distance with a threshold value, and halt the application of radiation if the comparison between the calculated Mahalanobis distance and the threshold value indicated the breathing cycle is abnormal.

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