Deadtime measurements with a multihole phantom: concise communication

Journal Article · Thu Jan 01 00:00:00 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), Vol. 22:1; Conference: 28. annual meeting of Society of Nuclear Medicine, Las Vegas, NV, USA, 16 Jun 1981
• Country of Publication: United States
• Language: English

Related Subjects

62 RADIOLOGY AND NUCLEAR MEDICINE
59 BASIC BIOLOGICAL SCIENCES
07 ISOTOPES AND RADIATION SOURCES
CAMERAS
TIME RESOLUTION
DEAD TIME
MEASURING METHODS
RADIOISOTOPE SCANNING
BLOOD FLOW
DYNAMIC FUNCTION STUDIES
PHANTOMS
RADIATION DOSES
RADIOLOGICAL PERSONNEL
SENSITIVITY
SPATIAL RESOLUTION
COUNTING TECHNIQUES
DOSES
MOCKUP
PERSONNEL
RESOLUTION
STRUCTURAL MODELS
TIMING PROPERTIES
550601* - Medicine- Unsealed Radionuclides in Diagnostics
551001 - Physiological Systems- Tracer Techniques
655002 - Medical Physics- Radiation Source Calibration & Standardization