Gamma camera-mounted anatomical X-ray tomography: technology, system characteristics and first images |
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Authors: | Moshe Bocher Adi Balan Yodphat Krausz Yigal Shrem Albert Lonn Michael Wilk Roland Chisin |
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Institution: | (1) Medical Biophysics and Nuclear Medicine, Hadassah University Hospital, Jerusalem, Israel, IL;(2) Elgems Ltd., Tirat-Hacarmel, Israel, IL |
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Abstract: | Scintigraphic diagnosis, based on functional image interpretation, becomes more accurate and meaningful when supported by
corresponding anatomical data. In order to produce anatomical images that are inherently registered with images of emission
computerised tomography acquired with a gamma camera, an X-ray transmission system was mounted on the slip-ring gantry of
a GEMS Millennium VG gamma camera. The X-ray imaging system is composed of an X-ray tube and a set of detectors located on
opposite sides of the gantry rotor that moves around the patient along with the nuclear detectors. A cross-sectional anatomical
transmission map is acquired as the system rotates around the patient in a manner similar to a third-generation computerised
tomography (CT) system. Following transmission, single-photon emission tomography (SPET) or positron emission tomography (PET)
coincidence detection images are acquired and the resultant emission images are thus inherently registered to the anatomical
maps. Attenuation correction of the emission images is performed with the same anatomical maps to generate transmission maps.
Phantom experiments of system performance and examples of first SPET and coincidence detection patient images are presented.
Despite limitations of the system when compared with a state of the art CT scanner, the transmission anatomical maps allow
for precise anatomical localisation and for attenuation correction of the emission images.
Received 27 October 1999 and in revised form 10 February 2000 |
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Keywords: | : Image registration Gamma camera Computerised tomography Positron emission tomography Single-photon emission tomography |
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