NDLI: Evaluation of the depth of interaction (DOI) for the High Resolution Research Tomograph (HRRT) - a comparison between scanners with and without DOI

Content Provider	IEEE Xplore Digital Library
Author	Knoess, C. Boellaard, R. Lenox, M. Vollmar, S. Casey, M. Fluegge, G. Lammertsma, A. Wienhard, K. Heiss, W.-D.
Copyright Year	2003
Description	Author affiliation: Max-Planck-Inst. for Neurological Res., Cologne, Germany (Knoess, C.)
Abstract	The High Resolution Research Tomograph (HRRT) is the first clinical LSO scanner with depth of interaction (DOI) capability. At the moment two HRRT's exist: one is located at the Max-Planck-Institute in Cologne and is equipped with two 7.5 mm thick crystal layers and DOI (HRRT-D); the second HRRT is located at the VUme in Amsterdam with a single crystal layer (HRRT-S). This constellation allows evaluation of scanner characteristics with and without DOI. The effects of DOI on resolution, sensitivity, scatter fraction (SF) and noise equivalent count (NEC) rates were studied. These characteristics were measured according to the NEMA NU2-1994 or 2001 standards. Emission scans were acquired in 64 bit list mode. For HRRT-D emission data were sorted into files with coincidences between the layers nearest to the center of the scanner only and into files with all layer combinations providing DOI. Resolution data were analyzed with different data compressions (span 3 and 9) and for FORE+2D-HOSP and 3D-OSEM. Different scatter fractions between both scanners were observed for lower level discriminator values (lids) of higher energy. NEC rates were about 3 times higher for HRRT-D. Best resolution values of 2.0 mm FWHM at 0 cm radial offset from the center and 2.5 mm FWHM at 10 cm radial offset were found using span 3 and 3D-OSEM for HRRT-S. Equal values were found for HRRT-D using DOI. For span 9 data and FORE+2D-HOSP the axial resolution decreased at off center locations to 4 mm FWHM or more. The higher NECR of HRRT-D compared with HRRT-S is explained by the higher sensitivity, obtained with the additional crystal layer. Differences in scatter fractions might be explained by the difference in crystal energy spectra of both scanners. Comparison of resolution data of both scanners showed that high spatial resolution was preserved with DOI.
Starting Page	1447
Ending Page	1451
File Size	1154704
Page Count	5
File Format	PDF
ISBN	0780376366
DOI	10.1109/NSSMIC.2002.1239593
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2002-11-10
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Detectors Energy resolution Spatial resolution Scattering National electric code Crystalline materials Head Sensor arrays Measurement standards Data analysis
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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