Effect of source size on the buildup factor calculation of absolute volume

Journal Article · Fri Nov 01 04:00:00 EST 1985 · J. Nucl. Med.; (United States)

OSTI ID:6246487

Siegel, J A

A general scheme for generating attenuation-corrected images for use in absolute volume measurements has been developed. The technique is based on a buildup factor approach for Compton scatter compensation and requires anterior and posterior count-rate measurements. The scatter correction requires evaluation of the attenuation factor, where mu is the linear attenuation coefficient in cm-1 and B(infinity) is the buildup factor at infinite depth. The attenuation factors for four different source sizes using /sup 99m/TcO4- and a 20% scintillation camera energy window are reported. The results indicated that B(infinity) was constant while mu varied as a function of size (S) in pixels according to mu = 0.151 cm-1 X exp(-1.18 X 10(-4) pixels-1 X S). Once the appropriate value of mu was determined, a pair of anterior-posterior count rate equations was used to generate attenuation-corrected count rate data for use in absolute volume measurements. The method was validated by calculating three separate phantom volumes. The results showed that the method provides less than +/- 6.0% error for volume determinations at all investigated depths.

• Research Organization: Temple Univ. Hospital, Philadelphia, PA
• OSTI ID: 6246487
• Journal Information: J. Nucl. Med.; (United States), Journal Name: J. Nucl. Med.; (United States) Vol. 11; ISSN JNMEA
• Country of Publication: United States
• Language: English

Related Subjects

61 RADIATION PROTECTION AND DOSIMETRY
655003* -- Medical Physics-- Dosimetry
ATTENUATION
BASIC INTERACTIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
BUILDUP
CALCULATION METHODS
COMPTON EFFECT
COUNTING RATES
COUNTING TECHNIQUES
DIAGNOSTIC TECHNIQUES
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
EVALUATION
HOURS LIVING RADIOISOTOPES
IMAGES
INTERACTIONS
INTERMEDIATE MASS NUCLEI
ISOMERIC NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MATHEMATICS
MOCKUP
NUCLEI
ODD-EVEN NUCLEI
OXYGEN COMPOUNDS
PHANTOMS
RADIOISOTOPE SCANNING
RADIOISOTOPES
REFRACTORY METAL COMPOUNDS
SCATTERING
SCINTISCANNING
STRUCTURAL MODELS
TECHNETATES
TECHNETIUM 99
TECHNETIUM COMPOUNDS
TECHNETIUM ISOTOPES
TRANSITION ELEMENT COMPOUNDS
VOLUME
YEARS LIVING RADIOISOTOPES