Cross calibration of two energy dispersive X-ray baggage screening systems including transformation of the reference database

摘要

A method of calibration of a dataset for spectroscopically resolved radiation scanning, comprising the steps of: generating an apparatus condition specific calibration dataset of emergent radiation intensity information generated after interaction in the scanning zone of at least one standard object spectroscopically resolved into a plurality of frequency bands; providing a transferable database comprising a dataset of transferable data items of emergent intensity information for a range of component materials, each spectroscopically resolved into a plurality of frequency bands and linked to the condition specific calibration dataset; defining a reference calibration dataset; generating a transfer function between the data item and the reference calibration dataset; applying the transfer function to the transferable data item to generate a dynamic data item adjusted to the reference calibration; populating a data register with a dynamic dataset comprising a dataset of data items each dynamically adjusted to the reference calibration.

主权项

1. A method of calibration of a dataset produced by an apparatus for scanning an object by causing incident radiation to impinge upon the object in a scanning zone and collecting spectroscopically resolved emergent intensity information of radiation after interaction with the object for use with a further apparatus for scanning an object, comprising the steps of:
generating an apparatus condition specific calibration dataset of emergent radiation intensity information generated after interaction in the scanning zone of at least one standard object spectroscopically resolved into a plurality of frequency bands; populating a transferable database comprising a dataset of transferable data items of emergent intensity information for a range of possible component materials, each data item comprising emergent radiation intensity information for the material spectroscopically resolved into a plurality of frequency bands, and each data item being linked to a calibration dataset of emergent radiation intensity information generated by the said at least one standard object specific to the apparatus condition used to generate the said data item spectroscopically resolved into a plurality of frequency bands; generating an apparatus condition specific calibration dataset for the further apparatus to be used comprising emergent radiation intensity information generated after interaction in the scanning zone of at least one standard object spectroscopically resolved into a plurality of frequency bands for an apparatus condition of the apparatus to be used; for each transferable data item: generating a transfer function from the functional relationship between the calibration dataset linked to the data item and the calibration dataset generated for the apparatus to be used by numerical comparison of the calibration dataset for the apparatus to be used and the calibration dataset for the apparatus used to generate each data item; and applying the transfer function to the transferable data item to generate a dynamic data item adjusted to the apparatus to be used; thereby populating a data register addressable by the apparatus with a dynamic dataset comprising a dataset of data items of emergent intensity information for a range of possible component materials each dynamically adjusted to the apparatus to be used.