Analytical study of a high-resolution positron ring detector system for transaxial reconstruction tomography

Journal Article · Mon Dec 01 04:00:00 EST 1975 · J. Nucl. Med., v. 16, no. 12, pp. 1166-1173

OSTI ID:4129908

Derenzo, S E; Zaklad, H; Budinger, T F

This paper presents an analytical study of a high-resolution positron ring detector system for transaxial reconstruction tomography. Our goal is a combination of good spatial resolution, high sensitivity, rejection of scattered photons, variable section thickness, and the minimization of the number of photomultipliers and coincidence circuits. A circular ring of 288 NaI(Tl) crystals 0.8 cm wide should provide a resolution of 4 to 7 mm FWHM over a circular region 30 cm in diameter. Coded light pipes permit readout using only 72 photomultipliers and 12 coincidence circuits. With properly designed shielding and an energy resolution of 30 percent FWHM, a positron activity of 200 $mu$Ci per axial centimeter in a 20-cm-diam cylinder of tissue should provide approximately 7,000 events/sec from a 2-cm-thick transaxial section (including a 5 percent accidental coincident background and a 26 percent scattered coincident background). This rate is adequate for both static and dynamic imaging. The device can operate at two to three times higher event rates with increased backgrounds. (auth)

• Research Organization: Univ. of California, Berkeley
• NSA Number: NSA-33-009332
• OSTI ID: 4129908
• Journal Information: J. Nucl. Med., v. 16, no. 12, pp. 1166-1173, Journal Name: J. Nucl. Med., v. 16, no. 12, pp. 1166-1173; ISSN JNMEA
• Country of Publication: United States
• Language: English

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