PMID- 22274425
OWN - NLM
STAT- MEDLINE
DCOM- 20120522
LR  - 20181023
IS  - 1094-4087 (Electronic)
IS  - 1094-4087 (Linking)
VI  - 20
IP  - 2
DP  - 2012 Jan 16
TI  - Comparison of image quality in computed laminography and tomography.
PG  - 794-806
LID - 10.1364/OE.20.000794 [doi]
AB  - In computed tomography (CT), projection images of the sample are acquired over an 
      angular range between 180 to 360 degrees around a rotation axis. A special case 
      of CT is that of limited-angle CT, where some of the rotation angles are 
      inaccessible, leading to artefacts in the reconstrucion because of missing 
      information. The case of flat samples is considered, where the projection angles 
      that are close to the sample surface are either i) completely unavailable or ii) 
      very noisy due to the limited transmission at these angles. Computed laminography 
      (CL) is an imaging technique especially suited for flat samples. CL is a 
      generalization of CT that uses a rotation axis tilted by less than 90 degrees 
      with respect to the incident beam. Thus CL avoids using projections from angles 
      closest to the sample surface. We make a quantitative comparison of the imaging 
      artefacts between CL and limited-angle CT for the case of a parallel-beam 
      geometry. Both experimental and simulated images are used to characterize the 
      effect of the artefacts on the resolution and visible image features. The results 
      indicate that CL has an advantage over CT in cases when the missing angular range 
      is a significant portion of the total angular range. In the case when the quality 
      of the projections is limited by noise, CT allows a better tradeoff between the 
      noise level and the missing angular range.
FAU - Xu, Feng
AU  - Xu F
AD  - Institute for Synchrotron Radiation, Karlsruhe Institute of Technology, Germany.
FAU - Helfen, Lukas
AU  - Helfen L
FAU - Baumbach, Tilo
AU  - Baumbach T
FAU - Suhonen, Heikki
AU  - Suhonen H
LA  - eng
PT  - Comparative Study
PT  - Journal Article
PL  - United States
TA  - Opt Express
JT  - Optics express
JID - 101137103
SB  - IM
MH  - *Artifacts
MH  - *Computer Simulation
MH  - Humans
MH  - Image Processing, Computer-Assisted/*methods/standards
MH  - Phantoms, Imaging
MH  - Tomography, X-Ray Computed/*methods/standards
EDAT- 2012/01/26 06:00
MHDA- 2012/05/23 06:00
CRDT- 2012/01/26 06:00
PHST- 2012/01/26 06:00 [entrez]
PHST- 2012/01/26 06:00 [pubmed]
PHST- 2012/05/23 06:00 [medline]
AID - 226164 [pii]
AID - 10.1364/OE.20.000794 [doi]
PST - ppublish
SO  - Opt Express. 2012 Jan 16;20(2):794-806. doi: 10.1364/OE.20.000794.