onr:"swepub:oai:DiVA.org:kth-28192"
Search: onr:"swepub:oai:DiVA.org:kth-28192" > Observer model opti...
- 1 of 1
- Previous record
- Next record
- To hitlist
Observer model optimization of a spectral mammography system
-
- Fredenberg, Erik, PhD, 1979- (author)
- KTH,Medicinsk bildfysik
-
- Åslund, Magnus (author)
- Sectra Mamea AB
-
- Cederström, Björn (author)
- KTH,Medicinsk bildfysik
- show more...
- show less...
- (creator_code:org_t)
- SPIE, 2010
- 2010
- English.
- In: Medical Imaging 2010. - : SPIE. - 9780819480231
- Conference paper (peer-reviewed)
Abstract
Subject headings
Close
- Spectral imaging is a method in medical x-ray imaging to extract information about the object constituents by the material-specific energy dependence of x-ray attenuation. Contrast-enhanced spectral imaging has been thoroughly investigated, but unenhanced imaging may be more useful because it comes as a bonus to the conventional non-energy-resolved absorption image at screening; there is no additional radiation dose and no need for contrast medium. We have used a previously developed theoretical framework and system model that include quantum and anatomical noise to characterize the performance of a photon-counting spectral mammography system with two energy bins for unenhanced imaging. The theoretical framework was validated with synthesized images. Optimal combination of the energy-resolved images for detecting large unenhanced tumors corresponded closely, but not exactly, to minimization of the anatomical noise, which is commonly referred to as energy subtraction. In that case, an ideal-observer detectability index could be improved close to 50% compared to absorption imaging. Optimization with respect to the signal-to-quantum-noise ratio, commonly referred to as energy weighting, deteriorated detectability. For small microcalcifications or tumors on uniform backgrounds, however, energy subtraction was suboptimal whereas energy weighting provided a minute improvement. The performance was largely independent of beam quality, detector energy resolution, and bin count fraction. It is clear that inclusion of anatomical noise and imaging task in spectral optimization may yield completely different results than an analysis based solely on quantum noise.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Medicinteknik -- Medicinsk laboratorie- och mätteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Medical Engineering -- Medical Laboratory and Measurements Technologies (hsv//eng)
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Radiologi och bildbehandling (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Radiology, Nuclear Medicine and Medical Imaging (hsv//eng)
Keyword
- model observer
- spectral imaging
- mammography
- photon counting
- energy subtraction
- energy weighting
- anatomical noise
- detectability index
- Medical engineering
- Medicinsk teknik
Publication and Content Type
- ref (subject category)
- kon (subject category)
Find in a library
- Medical Imaging 2010 (Search for host publication in LIBRIS)
To the university's database
- 1 of 1
- Previous record
- Next record
- To hitlist
Find more in SwePub
- By the author/editor
- Fredenberg, Erik ...
- Åslund, Magnus
- Cederström, Björ ...
- Lundqvist, Mats
- Danielsson, Mats
- About the subject
-
- ENGINEERING AND TECHNOLOGY
- ENGINEERING AND ...
- and Medical Engineer ...
- and Medical Laborato ...
-
- MEDICAL AND HEALTH SCIENCES
- MEDICAL AND HEAL ...
- and Clinical Medicin ...
- and Radiology Nuclea ...
- Articles in the publication
- Medical Imaging ...
- By the university
- Royal Institute of Technology
Search outside SwePub
- Extend your search to:
- Google Book Search
- Google Scholar
Kungliga biblioteket hanterar dina personuppgifter i enlighet med EU:s dataskyddsförordning (2018), GDPR. Läs mer om hur det funkar här.
Så här hanterar KB dina uppgifter vid användning av denna tjänst.
- Copyright © LIBRIS - National Library Systems
- LIBRIS.kb.se
