Assertion: em algorithm | /r/ObjectUse | used -ray computed tomography
Facets:
value: in medical image reconstruction
type: LOCATION
value: in positron emission tomography
type: OTHER
value: x-ray
type: OTHER
value: widely
type: DEGREE
Source sentences:
text: The EM algorithm (and its faster variant ordered subset expectation maximization) is also widely used in medical image reconstruction, especially in positron emission tomography, single photon emission computed tomography, and x-ray computed tomography.