The development of ASPECT, an annular single crystal brain camera for high efficiency spect
ASPECT is a new totally-digital annular SPECT camera system designed specifically for 3-dimensional brain imaging. Its detector consists of a ''single-crystal'' NaI(TI) ring (31 cm i.d. by 8 mm thick by 13 cm wide) coupled through an annular light pipe to a 21 by 3 array of 51 mm square photomultipliers. A unique multifield collimator system, consisting of set of six parallel hole collimators oriented in an annular array, is designed to view the patient's head from six angles simultaneously. This ring is rotated with high precision, concentric to the detector, through 2..pi.. radians to sample gamma ray emissions for 3-D reconstruction over a 23 cm by 9 cm field of view. Preliminary results indicate that central regions of the brain will be detected with an efficiency of about six times that of a conventional rotating parallel-hole camera SPECT system and an effective inherent transverse resolution of within 3.5 mm. The system is designed to achieve a reconstructed resolution FWHM within 7.5 mm at the center of the image field. It also features unique means for digital position analysis, calibration and user quality control. With ASPECT's precision rotating collimator, artifacts normally associated with detector motion, nonuniform sensitivity, and spatial nonlinearities are expected to be insignificant.
- Research Organization:
- Digital Scintigraphics, Inc. (DSI), 1972 Massachusetts Avenue, Box 1012, Cambridge, MA (US)
- OSTI ID:
- 7243858
- Report Number(s):
- CONF-871006-
- Journal Information:
- IEEE Trans. Nucl. Sci.; (United States), Vol. 35:1; Conference: 34. nuclear science symposium and 19. nuclear power systems symposium, San Francisco, CA, USA, 21 Oct 1987
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
07 ISOTOPES AND RADIATION SOURCES
62 RADIOLOGY AND NUCLEAR MEDICINE
BRAIN
IMAGE PROCESSING
SINGLE PHOTON EMISSION COMPUTED TOMOGRAPHY
CAMERAS
DESIGN
COLLIMATORS
QUALITY CONTROL
TECHNOLOGY ASSESSMENT
THREE-DIMENSIONAL CALCULATIONS
EFFICIENCY
CALIBRATION
CRYSTALS
DIGITAL SYSTEMS
HEAD
PATIENTS
PHOTOMULTIPLIERS
SENSITIVITY
SODIUM IODIDES
SPATIAL RESOLUTION
ALKALI METAL COMPOUNDS
BODY
BODY AREAS
CENTRAL NERVOUS SYSTEM
COMPUTERIZED TOMOGRAPHY
CONTROL
DIAGNOSTIC TECHNIQUES
EMISSION COMPUTED TOMOGRAPHY
HALIDES
HALOGEN COMPOUNDS
INORGANIC PHOSPHORS
IODIDES
IODINE COMPOUNDS
NERVOUS SYSTEM
ORGANS
PHOSPHORS
PHOTOTUBES
PROCESSING
RESOLUTION
SODIUM COMPOUNDS
TOMOGRAPHY
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