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Proceedings Paper

Imaging of small children with a prototype for photon counting tomosynthesis
Author(s): Lilián del Risco Norrlid; Erik Fredenberg; Magnus Hemmendorff; Christian Jackowski; Mats Danielsson
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Paper Abstract

We present data on a first prototype for photon counting tomosynthesis imaging of small children, which we call photoncounting tomosynthesis (PCT). A photon counting detector can completely eliminate electronic noise, which makes it ideal for tomosynthesis because of the low dose in each projection. Another advantage is that the detector allows for energy sensitivity in later versions, which will further lower the radiation dose. In-plane resolution is high and has been measured to be 5 lp/mm, at least 4 times better than in CT, while the depth resolution was significantly lower than typical CT resolution. The image SNR decreased from 30 to 10 for a detail of 10 mm depth in increasing thickness of PMMA from 10 to 80 mm. The air kerma measured for PCT was 5.2 mGy, which leads to an organ dose to the brain of approximately 0.7 mGy. This dose is 96 % lower than a typical CT dose. PCT can be appealing for pediatric imaging since young children have an increased sensitivity to radiation induced cancers. We have acquired post mortem images of a newborn with the new device and with a state-of-the-art CT and compared the diagnostic information and dose levels of the two modalities. The results are promising but more work is needed to provide input to a next generation prototype that would be suitable for clinical trials.

Paper Details

Date Published: 12 March 2009
PDF: 9 pages
Proc. SPIE 7258, Medical Imaging 2009: Physics of Medical Imaging, 72581O (12 March 2009); doi: 10.1117/12.813677
Show Author Affiliations
Lilián del Risco Norrlid, Royal Institute of Technology (Sweden)
Erik Fredenberg, Royal Institute of Technology (Sweden)
Magnus Hemmendorff, Sectra Mamea AB (Sweden)
Christian Jackowski, Univ. Bern (Switzerland)
Mats Danielsson, Royal Institute of Technology (Sweden)


Published in SPIE Proceedings Vol. 7258:
Medical Imaging 2009: Physics of Medical Imaging
Ehsan Samei; Jiang Hsieh, Editor(s)

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