Deadtime measurements with a multihole phantom: concise communication

Journal Article · Thu Jan 01 04:00:00 EST 1981 · J. Nucl. Med.; (United States)

OSTI ID:6985429

Heller, S L ^[1]; Wexler, J P; Powell, M; Blaufox, M D

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1. Albert Einstein Coll. of Medicine, Bronx, NY

The performance characteristics of any Anger camera are defined by that camera's spatial and temporal resolutions. Procedures using first-pass techniques - such as ejection fraction or left-to-right shunt determinations - require that deadtimes be minimal. We have evaluated a simplified method for measuring a camera's deadtime; it uses a multihole phantom consisting of a lead sheet with 196 holes, 7/16 in. diameter, arranged in a 14 x 14 matrix. Each hole can be filled with a removable lead plug. Count rates are determined following incremental removal of the plugs. Deadtime curves were generated for each of three cameras by this and standard techniques. For each camera, the three curves were virtually identical. Using the phantom, deadtimes could be determined in 15 to 20 min. This phantom provides a simple, rapid, and accurate means of determining camera deadtime and minimizing personnel radiation exposure.

• OSTI ID: 6985429
• Journal Information: J. Nucl. Med.; (United States), Journal Name: J. Nucl. Med.; (United States) Vol. 22:1; ISSN JNMEA
• Country of Publication: United States
• Language: English

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07 ISOTOPE AND RADIATION SOURCES
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59 BASIC BIOLOGICAL SCIENCES
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655002 -- Medical Physics-- Radiation Source Calibration & Standardization
BLOOD FLOW
CAMERAS
COUNTING TECHNIQUES
DEAD TIME
DOSES
DYNAMIC FUNCTION STUDIES
MEASURING METHODS
MOCKUP
PERSONNEL
PHANTOMS
RADIATION DOSES
RADIOISOTOPE SCANNING
RADIOLOGICAL PERSONNEL
RESOLUTION
SENSITIVITY
SPATIAL RESOLUTION
STRUCTURAL MODELS
TIME RESOLUTION
TIMING PROPERTIES