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
Evaluation of an AEC system for scanning photon counting mammography based on variation of scan velocity
KTH, Skolan för teknikvetenskap (SCI), Fysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik.ORCID-id: 0000-0002-3039-9791
(Engelska)Ingår i: Medical physics (Lancaster), ISSN 0094-2405Artikel i tidskrift (Övrigt vetenskapligt) Submitted
Nationell ämneskategori
Medicinsk laboratorie- och mätteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-6942OAI: oai:DiVA.org:kth-6942DiVA, id: diva2:11797
Anmärkning
QS 20120328Tillgänglig från: 2007-03-30 Skapad: 2007-03-30 Senast uppdaterad: 2022-06-26Bibliografiskt granskad
Ingår i avhandling
1. Digital Mammography with a Photon Counting Detector in a Scanned Multislit Geometry
Öppna denna publikation i ny flik eller fönster >>Digital Mammography with a Photon Counting Detector in a Scanned Multislit Geometry
2007 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Mammography screening aims to reduce the number of breast cancer deaths by early detection of the disease, which is one of the leading causes of deaths for middle aged women in the western world. The risk from the x-ray radiation in mammography is relatively low but still a factor in the benefit-risk ratio of screening. The characterization and optimization of a digital mammography system is presented in this thesis. The investigated system is shown to be highly dose efficient by employing a photon counting detector in a scanning multislit geometry.

A novel automatic exposure control (AEC) is proposed and validated in clinical practise. The AEC uses the leading detector edge to measure the transmission of the breast. The exposure is modulated by altering the scan velocity during the scan. A W-Al anode-filter combination is proposed.

The characterization of the photon counting detector is performed using the detective quantum efficiency. The effect of the photon counting detector and the multislit geometry on the measurement method is studied in detail. It is shown that the detector has a zero-frequency DQE of over 70\% and that it is quantum limited even at very low exposures.

Efficient rejection of image-degrading secondary radiation is fundamental for a dose efficient system. The efficiency of the scatter rejection techniques currently used are quantified and compared to the multislit geometry.

A system performance metric with its foundation in statistical decision theory is discussed. It is argued that a photon counting multislit system can operate at approximately half the dose compared to several other digital mammography techniques.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH, 2007. s. viii, 41
Serie
Trita-FYS, ISSN 0280-316X ; 2007:28
Nyckelord
mammography, digital, photon counting, scanning, detective quantum effciency, scattered radiation, automatic exposure control
Nationell ämneskategori
Fysik
Identifikatorer
urn:nbn:se:kth:diva-4322 (URN)978-91-7178-622-7 (ISBN)
Disputation
2007-04-20, Sal F3, KTH, Lindstedtsvägen 26, Stockholm, 14:00
Opponent
Handledare
Anmärkning
QC 20100825Tillgänglig från: 2007-03-30 Skapad: 2007-03-30 Senast uppdaterad: 2022-06-26Bibliografiskt granskad

Open Access i DiVA

Fulltext saknas i DiVA

Sök vidare i DiVA

Av författaren/redaktören
Åslund, MagnusCederström, BjörnLundqvist, MatsDanielsson, Mats
Av organisationen
Fysik
I samma tidskrift
Medical physics (Lancaster)
Medicinsk laboratorie- och mätteknik

Sök vidare utanför DiVA

GoogleGoogle Scholar

urn-nbn

Altmetricpoäng

urn-nbn
Totalt: 147 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