Description and performance comparison of commercial and prototype dual photon absorptiometry (DPA) systems

Conference · Wed May 01 04:00:00 EDT 1985 · J. Nucl. Med.; (United States)

OSTI ID:5875542

Dunn, W L; Wahner, H W

DPA has become of major interest for clinical measurements of bone mineral (BM) in the axial skeleton. Several commercial instruments are now available. The objective of this paper is a description and comparison of these instruments with some of the instruments used in clinical research laboratories. /sup 153/Gd is almost exclusively used as a source (1-1.5Ci). All instruments use NaI(T1) detectors. Detector collimator sizes vary from about 0.6 to 1.3 cm diameter. Linearity, accuracy and reproducibility of BM measurements were evaluated by scanning a series of ashed bones in 20 cm of water. Reproducibility was studied by performing multiple scans of ashed bones and a cadaver spine, CV being less than 2.1% for the spine. Minimum performance criteria for a clinical bone mineral test is a reproducibility of less than 3%. Dosimetry studies conducted to date show a peak skin dose of 18 mrad (0.18mGy). Additional dosimetry measurements are presently being performed. The authors conclude that the commercial DPA units provide results which are clinically acceptable and comparable to the prototype systems.

• Research Organization: Mayo Clinic/Foundation, Rochester, MN
• OSTI ID: 5875542
• Report Number(s): CONF-850611-
• Conference Information: Journal Name: J. Nucl. Med.; (United States) Journal Volume: 26:5
• Country of Publication: United States
• Language: English

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46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
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62 RADIOLOGY AND NUCLEAR MEDICINE
ANIMAL TISSUES
BETA DECAY RADIOISOTOPES
BODY
BONE TISSUES
CAT SCANNING
CHEMICAL ANALYSIS
COMPARATIVE EVALUATIONS
COMPUTERIZED TOMOGRAPHY
CONNECTIVE TISSUE
COUNTING TECHNIQUES
DAYS LIVING RADIOISOTOPES
DIAGNOSTIC TECHNIQUES
DOSIMETRY
ELECTRON CAPTURE RADIOISOTOPES
EMISSION COMPUTED TOMOGRAPHY
EVEN-ODD NUCLEI
GADOLINIUM 153
GADOLINIUM ISOTOPES
GAMMA DOSIMETRY
IMAGE INTENSIFIERS
IMAGE SCANNERS
INTERMEDIATE MASS NUCLEI
ISOTOPES
MEASURING INSTRUMENTS
MINERALS
NAI DETECTORS
NUCLEI
PERFORMANCE
PERFORMANCE TESTING
QUANTITATIVE CHEMICAL ANALYSIS
RADIATION DETECTORS
RADIOISOTOPE SCANNING
RADIOISOTOPES
RARE EARTH ISOTOPES
RARE EARTH NUCLEI
RELIABILITY
SCINTILLATION COUNTERS
SCINTISCANNING
SENSITIVITY
SOLID SCINTILLATION DETECTORS
TESTING
TISSUES
TOMOGRAPHY