Simultaneous SPECT and CT with an opposed dual head gamma camera system and conventional parallel hole collimators

Journal Article · Thu Aug 01 04:00:00 EDT 1996 · IEEE Transactions on Nuclear Science

DOI:https://doi.org/10.1109/23.531888· OSTI ID:379763

Kimiaei, S; Larsson, S A ^[1]

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1. Karolinska Hospital, Stockholm (Sweden). Dept. of Hospital Physics

All examinations aiming at quantitative assessment of activity concentrations suffer from non-uniform attenuation due to inhomogeneous tissue density in various body regions. In such applications, a combined transmission tomography with SPECT has demonstrated great clinical advantages since it allows a pixel by pixel correction for attenuation based on measured data. The authors have developed a method for transmission studies that is applicable to dual head detector systems with conventional parallel-hole collimators. A scanning line-source (Am-241) is mounted close to one camera head with its beam directed towards the other head. Two energy discrimination windows are used for each camera head. The camera-head near to the transmission source registrates SPECT-data in one window and the spill-over of scattered emission photons into the Am-window. The opposed camera registrates SPECT-data in one window and the transmission data from the Am-source in another window. Post acquisition corrections are made for differences in camera uniformity and for loss of SPECT-data due to shadowing of the field-of-view during the transverse movement of the transmission device (about 5%).

• OSTI ID: 379763
• Report Number(s): CONF-951073--
• Journal Information: IEEE Transactions on Nuclear Science, Journal Name: IEEE Transactions on Nuclear Science Journal Issue: 4Pt1 Vol. 43; ISSN 0018-9499; ISSN IETNAE
• Country of Publication: United States
• Language: English

Related Subjects

55 BIOLOGY AND MEDICINE
BASIC STUDIES
AMERICIUM 241
COLLIMATORS
COMPUTERIZED TOMOGRAPHY
CORRECTIONS
DATA ACQUISITION
DATA ANALYSIS
GAMMA CAMERAS
SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY