The development of ASPECT, an annular single crystal brain camera for high efficiency spect

Conference · Mon Feb 01 04:00:00 EST 1988 · IEEE Trans. Nucl. Sci.; (United States)

OSTI ID:7243858

Genna, S; Smith, A P

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-
• Conference Information: Journal Name: IEEE Trans. Nucl. Sci.; (United States) Journal Volume: 35:1
• Country of Publication: United States
• Language: English

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ALKALI METAL COMPOUNDS
BODY
BODY AREAS
BRAIN
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CRYSTALS
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IODIDES
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NERVOUS SYSTEM
ORGANS
PATIENTS
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PHOTOMULTIPLIERS
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TOMOGRAPHY