Sinogram bow-tie filtering in FBP PET reconstruction

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Show simple item record Abella García, Mónica Vaquero López, Juan José Soto Montenegro, M. L. Desco Menéndez, Manuel Lage Negro, Eduardo 2011-09-15T13:22:15Z 2011-09-15T13:22:15Z 2009-05
dc.identifier.bibliographicCitation Medical Physics, may. 2009, vol. 36, n. 5, p. 1663-1671
dc.identifier.issn 0094-2405
dc.description.abstract Low-pass filtering of sinograms in the radial direction is the most common practice to limit noise amplification in filtered back projection FBP reconstruction of positron emission tomography studies. Other filtering strategies have been proposed to prevent the loss in resolution due to low-pass radial filters, although results have been diverse. Using the well-known properties of the Fourier transform of a sinogram, the authors defined a binary mask that matches the expected shape of the support region in the Fourier domain of the sinogram “bow tie”. This mask was smoothed by a convolution with a ten-point Gaussian kernel which not only avoids ringing but also introduces a pre-emphasis at low frequencies. A new filtering scheme for FBP is proposed, comprising this smoothed bow-tie filter combined with a standard radial filter and an axial filter. The authors compared the performance of the bow-tie filtering scheme with that of other previously reported methods: Standard radial filtering, angular filtering, and stackgram-domain filtering. All the quantitative data in the comparisons refer to a baseline reconstruction using a ramp filter only. When using the smallest size of the Gaussian kernel in the stackgram domain, the authors achieved a noise reduction of 33% at the cost of degrading radial and tangential resolutions 14.5% and 16%, respectively, for cubic interpolation . To reduce the noise by 30%, the angular filter produced a larger degradation of contrast 3% and tangential resolution 46% at 10 mm from the center of the field of view and showed noticeable artifacts in the form of circular blurring dependent on the distance to the center of the field of view. For a similar noise reduction 33%, the proposed bow-tie filtering scheme yielded optimum results in resolution (gain in radial resolution of 10%) and contrast (1% increase) when compared with any of the other filters alone. Experiments with rodent images showed noticeable image quality enhancement when using the proposed bow-tie filtering scheme
dc.description.sponsorship This work was partially funded by projects CD-TEAM CENIT program, Ministerio de Industria, CIBERsam CB07/09/0031 Ministerio de Sanidad y Consumo, TEC2004-07052-C02 Ministerio de Educación y Ciencia, and GR/SAL/024104 Comunidad de Madrid
dc.format.mimetype application/pdf
dc.language.iso eng
dc.publisher American Association of Physicists in Medicine
dc.rights Atribución-NoComercial-SinDerivadas 3.0 España
dc.subject.other PET reconstruction
dc.subject.other Filtered backprojection
dc.subject.other FBP
dc.subject.other Bow-tie
dc.subject.other Sinogram filtering
dc.subject.other Noise reduction
dc.title Sinogram bow-tie filtering in FBP PET reconstruction
dc.type article
dc.description.status Publicado
dc.subject.eciencia Biología y Biomedicina
dc.identifier.doi 10.1118/1.3096707
dc.rights.accessRights openAccess
dc.type.version acceptedVersion
dc.identifier.publicationfirstpage 1663
dc.identifier.publicationissue 5
dc.identifier.publicationlastpage 1671
dc.identifier.publicationtitle Medical Physics
dc.identifier.publicationvolume 36
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