Simultaneous SPECT and CT with shutter controlled radionuclide sources and parallel collimator geometry

Journal Article · Sun Aug 01 04:00:00 EDT 1993 · IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States)

DOI:https://doi.org/10.1109/23.256721· OSTI ID:6062332

Larsson, S A; Kimiaei, S; Ribbe, T ^[1]

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1. Karolinska Hospital/Inst., Stockholm (Sweden)

A method for combined SPECT and transmission tomography has been developed for application to parallel collimator geometry. The technique is based on a specially designed, shutter operated device with radionuclide line-sources for the transmission studies. Simultaneous SPECT and transmission data acquisition can be made but cross-talk may disturb the two separate data sets. The present device operates with four 1 GBq, 40cm long line-sources of [sup 99]Tc[sup m]. Using the same radionuclide for SPECT, emission data is acquired with the shutter closed. At the same angle, transmission data is subsequently acquired with the shutter open. In this case, the total acquisition time is prolonged and the transmission data has to be corrected before reconstruction. Using different emission and transmission photon energies, the shutter may be open during most of the SPECT acquisition time and closed only for collecting cross-talk correction data. Recent experiments have been performed with a transmission source with lower photon energy, 0.8 GBq [sup 153]Gd-line-sources. Simulations of transmission data indicated that the activity of [sup 153]Gd might be about 2.5 times that of [sup 99]Tc[sup m] and about 6 times higher for [sup 241]Am for the same image noise. Simulations also showed that the total activity in uniform line-sources may be reduced without increasing the noise by choosing line-sources with an activity distribution that is average inversed to the photon transmission through the object.

• OSTI ID: 6062332
• Journal Information: IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States), Journal Name: IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States) Vol. 40:4 part 1; ISSN 0018-9499; ISSN IETNAE
• Country of Publication: United States
• Language: English

Related Subjects

550601* -- Medicine-- Unsealed Radionuclides in Diagnostics
62 RADIOLOGY AND NUCLEAR MEDICINE
ACCURACY
CAMERAS
COMPUTERIZED TOMOGRAPHY
DATA ACQUISITION
DESIGN
DIAGNOSTIC TECHNIQUES
EMISSION COMPUTED TOMOGRAPHY
GAMMA CAMERAS
OPTIMIZATION
SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY
TOMOGRAPHY