Gamma camera-mounted anatomical X-ray tomography: Technology, system characteristics and first images

Moshe Bocher, Adi Balan, Yodphat Krausz, Yigal Shrem, Albert Lonn, Michael Wilk, Roland Chisin

Research output: Contribution to journalArticlepeer-review

184 Scopus citations

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 ground 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.

Original languageEnglish
Pages (from-to)619-627
Number of pages9
JournalEuropean Journal of Nuclear Medicine
Volume27
Issue number6
DOIs
StatePublished - Jun 2000
Externally publishedYes

Keywords

  • Computerised tomography
  • Gamma camera
  • Image registration
  • Positron emission tomography Single-photon emission tomography

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