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Related Concept Videos

Adjusting a Traverse01:12

Adjusting a Traverse

In the site survey of a four-sided traverse, internal angles are essential to ensure geometric accuracy. The survey revealed that the sum of the measured internal angles was 359 degrees and 48 minutes, which is 12 minutes less than the expected 360 degrees. This discrepancy signals an error likely arising from measurement inaccuracies during the fieldwork.To rectify this error, the adjustment process involved distributing the 12-minute shortfall equally across the four internal angles. By...

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Accurate geometric calibration in stepping-table digital subtraction angiography.

M A Schmidt1, S L Nayak, A-M Belli

  • 1Department of Medical Physics, St George's Hospital, London SW17 0QT, UK. maria.schmidt@stgeorges.nhs.uk

The British Journal of Radiology
|September 19, 2007
PubMed
Summary

Accurate vessel dimension measurements are now possible using stepping-table digital subtraction angiography (DSA). This method calibrates images, enabling precise quantitative analysis without external reference objects.

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Area of Science:

  • Medical Imaging
  • Radiology
  • Quantitative Analysis

Background:

  • Accurate vessel dimension measurements are crucial for various clinical applications.
  • Traditional methods may lack precision or require external calibration tools.

Purpose of the Study:

  • To develop and validate a geometric calibration method for stepping-table digital subtraction angiography (DSA).
  • To enable accurate quantitative measurements of vessel dimensions in millimeters from pixel data.

Main Methods:

  • Utilized the known relative motion between the X-ray source and patient in stepping-table DSA.
  • Developed a calibration factor to convert pixel measurements to millimeters.
  • Evaluated accuracy using a test object and in vivo renal DSA examinations.

Main Results:

  • Achieved 0.1% accuracy for the calibration factor with a test object.
  • Demonstrated at least 2% accuracy in vivo, even with patient motion.
  • Confirmed submillimeter accuracy potential for clinical studies.

Conclusions:

  • Accurate geometric measurements are feasible in stepping-table DSA.
  • The proposed method eliminates the need for external reference objects.
  • Submillimeter accuracy is achievable for clinical quantitative analysis.