kth.sePublikationer
Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
On imaging with or without grid in digital mammography
KTH, Skolan för teknikvetenskap (SCI), Fysik, Medicinsk bildfysik.ORCID-id: 0000-0001-8560-3262
KTH, Skolan för teknikvetenskap (SCI), Fysik, Medicinsk bildfysik.ORCID-id: 0000-0002-3039-9791
KTH, Skolan för teknikvetenskap (SCI), Fysik, Medicinsk bildfysik.
2014 (Engelska)Ingår i: Proceedings of SPIE, the International Society for Optical Engineering, ISSN 0277-786X, E-ISSN 1996-756X, Vol. 9033, s. 903346-Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The grids used in digital mammography to reduce scattered radiation from the breast are not perfect and lead to partial absorption of primary radiation at the same time as not all of the scattered radiation is absorbed. It has therefore lately been suggested to remove the grids and correct for effects of scattered radiation by post-processing the images. In this paper, we investigated the dose reduction that might be achieved if the gird were to be removed. Dose reduction is determined as a function of PMMA thickness by comparing the contrast-to-noise ratios (CNRs) of images acquired with and without grid at a constant exposure. We used a theoretical model validated with Monte Carlo simulations and phantom studies. To evaluate the CNR, we applied aluminum filters of two different sizes, 4x8 cm2 and 1x1 cm 2. When the large Al filter was used, the resulting CNR value for the grid-less images was overestimated as a result of a difference in amount of scattered radiation in the background region and of the region covered by the filter, a difference that could be eliminated by selecting a region of interest close to the edge of the filter. The optimal CNR when the PMMA thickness was above about 4 cm was obtained with a grid, whereas removing the grid leaded to a dose saving in thinner PMMAs. The results suggest not removing grids in breast cancer screening.

Ort, förlag, år, upplaga, sidor
SPIE - International Society for Optical Engineering, 2014. Vol. 9033, s. 903346-
Nyckelord [en]
CNR, grid, Mammography, phantom, scattered radiation
Nationell ämneskategori
Radiologi och bildbehandling
Identifikatorer
URN: urn:nbn:se:kth:diva-146792DOI: 10.1117/12.2043017ISI: 000338775800144Scopus ID: 2-s2.0-84901624717OAI: oai:DiVA.org:kth-146792DiVA, id: diva2:725443
Konferens
Medical Imaging 2014: Physics of Medical Imaging; San Diego, CA; United States; 17 February 2014 through 20 February 2014
Anmärkning

QC 20140616

Tillgänglig från: 2014-06-16 Skapad: 2014-06-16 Senast uppdaterad: 2024-03-18Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Övriga länkar

Förlagets fulltextScopus

Person

Chen, HanDanielsson, MatsCederström, Björn

Sök vidare i DiVA

Av författaren/redaktören
Chen, HanDanielsson, MatsCederström, Björn
Av organisationen
Medicinsk bildfysik
I samma tidskrift
Proceedings of SPIE, the International Society for Optical Engineering
Radiologi och bildbehandling

Sök vidare utanför DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 571 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf