Quantitative angioscopy: A novel method of measurement of luminal dimensions during angioscopy with the use of a "lightwire"

J. Richard Spears, Mahmood Ali, Syed J. Raza, Gayathri S. Iyer, Srihari Ravi, Richard Crilly, Barbara Fromm, Wai Fung Cheong

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Purpose: To determine the accuracy and reproducibility of luminal dimension measurements of a newly developed method of quantitative angioscopy. Methods: A method was developed for quantitation of luminal dimensions during angioscopy, as variation in magnification with lens-object distance and ambiguity associated with identification of corresponding points about the circumference of a given discrete cross-section render subjective estimates unreliable. A transverse ring of fiberoptically transmitted light was emitted from a guidewire or its housing at a known distance from the distal end of an angioscope and discrete cross-sections of interest were observed as the ring of light was reflected from the luminal surface. Caliper measurement of the diameter of the light ring image (<50 mW at 488/515 nm), obtained on angioscopic video recordings of cylindrical phantom vessels of known dimensions, was performed by three observers on five occasions. Results: The mean absolute difference between measured and known luminal diameter (n = 405 observations) was 65 μm±35 μm and the mean coefficient of variation was 4.2%, and the mean difference between measured and known areas (n = 195 observations) was 0.4 mm2, with a mean coefficient of variation of 6.5%. Conclusion: By use of this new lightwire method, luminal dimensions can now be measured in vitro with a high degree of accuracy and reproducibility during angioscopy.

Original languageEnglish (US)
Pages (from-to)197-203
Number of pages7
JournalCardioVascular and Interventional Radiology
Volume17
Issue number4
DOIs
StatePublished - Jul 1994
Externally publishedYes

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Angioscopy
Light
Angioscopes
Video Recording
Lenses

Keywords

  • Angiography
  • Angioscopy
  • Atherosclerosis
  • Coronary artery disease

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Cardiology and Cardiovascular Medicine

Cite this

Quantitative angioscopy : A novel method of measurement of luminal dimensions during angioscopy with the use of a "lightwire". / Spears, J. Richard; Ali, Mahmood; Raza, Syed J.; Iyer, Gayathri S.; Ravi, Srihari; Crilly, Richard; Fromm, Barbara; Cheong, Wai Fung.

In: CardioVascular and Interventional Radiology, Vol. 17, No. 4, 07.1994, p. 197-203.

Research output: Contribution to journalArticle

Spears, J. Richard ; Ali, Mahmood ; Raza, Syed J. ; Iyer, Gayathri S. ; Ravi, Srihari ; Crilly, Richard ; Fromm, Barbara ; Cheong, Wai Fung. / Quantitative angioscopy : A novel method of measurement of luminal dimensions during angioscopy with the use of a "lightwire". In: CardioVascular and Interventional Radiology. 1994 ; Vol. 17, No. 4. pp. 197-203.
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