Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1980-4-25
pubmed:abstractText
If a collimated radiation detector (sodium iodide crystal) and a collimated X-ray source are positioned at right angles, scattered radiation will be sensed and the detector will generate a signal as tissue enters and leaves the "sensitive volume" formed by the intersection of the field of view of the detector and incident beam. This technique, called dynamic radiography, was used to identify and quantify the components of epicardial motion in anesthetized open-chested dogs. The data so obtained were validated by two independent optical methods: biplane cinematography and a technique that measures the shadow cast by the heart using a light beam-cadmium sulfide photocell. Displacement measured by dynamic radiography appeared to be the time integral of the scalar product of the velocity vector and the vector normal to the surface area within the sensitive volume, i.e., that component of displacement of myocardial mass that was perpendicular to the surface of the myocardium. In other words, the dynamic radiographic signal was proportional to the mass of tissue within the sensitive volume. Good agreement in terms of absolute motion, its direction, and phase was noted between predicted dynamic radiographic signals and those observed. Thus validated, this technique was found to be reliable in quantifying motion abnormalities produced by acute coronary ligation.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:status
MEDLINE
pubmed:month
Jan
pubmed:issn
0002-9513
pubmed:author
pubmed:issnType
Print
pubmed:volume
238
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
H43-53
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1980
pubmed:articleTitle
Validation of dynamic radiography in the dog and evaluation of ischemic dyssynergy.
pubmed:publicationType
Journal Article