Statistical reconstruction for x-ray CT systems with non-continuous detectors

Wojciech Zbijewski, Michel Defrise, Max A. Viergever, Freek J. Beekman

Research output: Contribution to journalArticlepeer-review


We analyse the performance of statistical reconstruction (SR) methods when applied to non-continuous x-ray detectors. Robustness to projection gaps is required in x-ray CT systems with multiple detector modules or with defective detector pixels. In such situations, the advantage of statistical reconstruction is that it is able to ignore missing or faulty pixels and that it makes optimal use of the remaining line integrals. This potentially obviates the need to fill the sinogram discontinuities by interpolation or any other approximative pre-processing techniques. In this paper, we apply SR to cone beam projections of (i) a hypothetical modular detector micro-CT scanner and of (ii) a system with randomly located defective detector elements. For the modular-detector system, SR produces reconstruction volumes free of noticeable gap-induced artefacts as long as the location of detector gaps and selection of the scanning range provide complete object sampling in the central imaging plane. When applied to randomly located faulty detector elements, SR produces images free of substantial ring artefacts even for cases where defective pixels cover as much as 3% of the detector area.

Original languageEnglish (US)
Article number007
Pages (from-to)403-418
Number of pages16
JournalPhysics in medicine and biology
Issue number2
StatePublished - Jan 21 2007
Externally publishedYes

ASJC Scopus subject areas

  • Radiological and Ultrasound Technology
  • Radiology Nuclear Medicine and imaging


Dive into the research topics of 'Statistical reconstruction for x-ray CT systems with non-continuous detectors'. Together they form a unique fingerprint.

Cite this