Matches in UGent Biblio for { <https://biblio.ugent.be/publication/3144493#aggregation> ?p ?o. }
Showing items 1 to 35 of
35
with 100 items per page.
- aggregation classification "A1".
- aggregation creator person.
- aggregation creator person.
- aggregation creator person.
- aggregation creator person.
- aggregation date "2013".
- aggregation format "application/pdf".
- aggregation hasFormat 3144493.bibtex.
- aggregation hasFormat 3144493.csv.
- aggregation hasFormat 3144493.dc.
- aggregation hasFormat 3144493.didl.
- aggregation hasFormat 3144493.doc.
- aggregation hasFormat 3144493.json.
- aggregation hasFormat 3144493.mets.
- aggregation hasFormat 3144493.mods.
- aggregation hasFormat 3144493.rdf.
- aggregation hasFormat 3144493.ris.
- aggregation hasFormat 3144493.txt.
- aggregation hasFormat 3144493.xls.
- aggregation hasFormat 3144493.yaml.
- aggregation isPartOf urn:issn:0031-9155.
- aggregation language "eng".
- aggregation rights "I have transferred the copyright for this publication to the publisher".
- aggregation subject "Technology and Engineering".
- aggregation title "Characterization of a SPECT pinhole collimator for optimal detector usage (the lofthole)".
- aggregation abstract "In single-photon emission computed tomography (SPECT), multi-pinhole collimation is often employed nowadays. Most multi-pinhole collimators avoid overlap (multiplexing) of the projections on the detector. This can be done by using additional shielding or by spacing the pinholes far enough apart. Using additional shielding has the drawback that it increases weight, design complexity and cost. Spacing the pinholes far enough apart results in suboptimal detector usage, the valuable detector area is not entirely used. This is due to the circular projections of pinholes on the detector; these ellipses can not be tiled with high detector coverage. To overcome this we designed a new pinhole geometry, the lofthole, that has a rectangular projection on the detector. The lofthole has a circular aperture and a rectangular entrance/exit opening. Sensitivity formulae have been derived for pinholes and loftholes. These formulae take the penumbra effect into account; the proposed formulae do not take penetration into account. The derived formulae are valid for geometries where the field-of-view and the sensitivity of the aperture are solely limited by the exit window. A flood map measurement was performed to compare the rectangular projection of a lofthole with the circular projection of a pinhole. Finally, measurements were done to compare the amount of penetration of pinholes with the amount of penetration of a lofthole. A square lofthole collimator has less penetration than a knife-edge pinhole collimator that irradiates the same rectangular detector area with full coverage. A multilofthole collimator allows high detector coverage without using additional shielding. An additional advantage is the lower amount of penetration.".
- aggregation authorList BK856884.
- aggregation endPage "885".
- aggregation issue "4".
- aggregation startPage "859".
- aggregation volume "58".
- aggregation aggregates 3144525.
- aggregation isDescribedBy 3144493.
- aggregation similarTo 859.
- aggregation similarTo LU-3144493.