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| Predicate | Object |
|---|---|
| rdf:type | |
| lifeskim:mentions | |
| pubmed:issue |
3
|
| pubmed:dateCreated |
1976-1-29
|
| pubmed:abstractText |
Most methods used to estimate the absolute organ content of a gamma-emitting radionuclide from external counting measurements assume that the depth distribution of activity is equivalent to a point source of the same activity located at an 'effective' depth. A theoretical analysis is presented which shows that this assumption is not correct for a dual opposed detector system, because of self-attenuation of the photons by the organ (or source). Experimental varification is also given, and it indicates that the error caused by this assumption is normally less than 10%, although it can be very large in special cases.
|
| pubmed:language |
eng
|
| pubmed:journal | |
| pubmed:citationSubset |
IM
|
| pubmed:status |
MEDLINE
|
| pubmed:month |
May
|
| pubmed:issn |
0031-9155
|
| pubmed:author | |
| pubmed:issnType |
Print
|
| pubmed:volume |
20
|
| pubmed:owner |
NLM
|
| pubmed:authorsComplete |
Y
|
| pubmed:pagination |
455-64
|
| pubmed:dateRevised |
2007-11-15
|
| pubmed:meshHeading | |
| pubmed:year |
1975
|
| pubmed:articleTitle |
The validity of an equivalent point source (EPS) assumption used in quantitative scanning.
|
| pubmed:publicationType |
Journal Article
|