NDLI: Automatic exposure control (AEC) for dual energy computed tomography (DECT)

Content Provider	IEEE Xplore Digital Library
Author	Stenner, P. Kachelriess, M.
Copyright Year	2007
Description	Author affiliation: Univ. of Erlangen -Nurnberg, Erlangen (Stenner, P.; Kachelriess, M.)
Abstract	DECT means acquiring the same object at two different energies, respectively two different tube voltages $U_{1}$ and $U_{2}.$ The rawdata $q_{1}$ and $q_{2}$ undergo a decomposition process of type p = $p(q_{1},$ $q_{2}).$ The rawdata p are reconstructed to obtain monochromatic images of the attenuation mu, of the object density p or of a specific material distribution. Given p and a rawdata-based projection-wise patient dose estimation D (alpha) we determine the optimal tube current curves $I_{1}(alpha)$ and $I_{2}$ (alpha), with alpha being the view angle, that minimizes image noise for a given patient dose level. AEC for DECT can perform online, $I_{1}(alpha)$ and $I_{2}$ (alpha) can be determined during the scan. Simulation studies using semianthropomorphic phantom data were carried out. In particular functions p that generate mu-images and density images were evaluated. Image quality was compared to standard scans at $U_{o}$ = 120 kV (clinical CT) and $U_{o}$ = 45 kV (micro-CT) that were taken at the same dose level (Do = $D_{1}$ + $D_{2})$ and identical spatial resolution. Appropriate choice of $p(q_{1},q_{2})$ allows to obtain mu images that are both artifact-free and show image noise levels comparable to the noise of the standard scan. Here, mu images at 25 keV (micro-CT) and 70 keV (clinical CT) turned out to be optimal. Non-optimal choice of the decomposition function will, however, significantly increase image noise. In particular mu images at 511 keV, as needed for PET/CT attenuation correction, exhibit more than twice as much image noise as the standard scan. With DECT-AEC, that guarantees best dose usage possible, monochromatic images are generated with only slightly increased noise levels at the same dose compared to a standard scan. The benefit of significantly decreased artifacts appears to allow using DECT-AEC-generated monochromatic images in daily routine.
Starting Page	4367
Ending Page	4372
File Size	735624
Page Count	6
File Format	PDF
ISBN	9781424409228
ISSN	10957863
DOI	10.1109/NSSMIC.2007.4437081
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-10-26
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Automatic control Computed tomography Noise level Attenuation Voltage Image reconstruction Raw materials Imaging phantoms Image quality Spatial resolution
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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