Relative calibration of energy thresholds on multi-bin spectral x-ray detectors
2016 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 840, 1-4 p.Article in journal (Refereed) Published
Accurate and reliable energy calibration of spectral x-ray detectors used in medical imaging is essential for avoiding ring artifacts in the reconstructed images (computed tomography) and for performing accurate material basis decomposition. A simple and accurate method for relative calibration of the energy thresholds on a multi-bin spectral x-ray detector is presented. The method obtains the linear relations between all energy thresholds in a channel by scanning the thresholds with respect to each other during x-ray illumination. The method does not rely on a model of the detector's response function and does not require any identifiable features in the x-ray spectrum. Applying the same method, the offset between the thresholds can be determined also without external stimuli by utilizing the electronic noise as a source. The simplicity and accuracy of the method makes it suitable for implementation in clinical multi-bin spectral x-ray imaging systems.
Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 840, 1-4 p.
Computed tomography Energy calibration Multi-bin Photon-counting Spectral X-ray detectors
Medical Equipment Engineering
Research subject Medical Technology
IdentifiersURN: urn:nbn:se:kth:diva-195022DOI: 10.1016/j.nima.2016.09.045ScopusID: 2-s2.0-84991812993OAI: oai:DiVA.org:kth-195022DiVA: diva2:1043906
QC 201611012016-11-012016-11-012016-11-03Bibliographically approved