Computer-Assisted, Operator-Interactive Technique for Calculating Pulmonary Arterial Taper
| Autor: | Tamas Sandor, Lawrence M. Boxt, Donald P. Harrington, Lynne Reid, William B. Hanlon, Ruthellen Fried |
|---|---|
| Rok vydání: | 1985 |
| Předmět: |
Heart Septal Defects
Ventricular medicine.medical_specialty Computers Hypertension Pulmonary Computation Operator (physics) Infant Newborn Cubic spline function Infant General Medicine Pulmonary Artery Radiography Matrix (mathematics) Arterial segment Inflection point Caliber Child Preschool Internal medicine Methods medicine Cardiology Humans Radiology Nuclear Medicine and imaging Mathematics Biomedical engineering |
| Zdroj: | Investigative Radiology. 20:136-140 |
| ISSN: | 0020-9996 |
| DOI: | 10.1097/00004424-198503000-00007 |
| Popis: | We have developed a computer-assisted, operator-interactive technique which performs fast, precise computations of pulmonary artery taper. Individual 35-mm cineframes from balloon-occlusion pulmonary arteriograms are digitized into a 640 X 480 matrix in 8-bit depth and loaded into a VAX 11/780 computer for analysis. After operator identification of the arterial segment, an automated process of caliber analysis is initiated. By fitting a cubic spline function to the densitometric profiles extracted from the arterial segment, serial arterial cross-sectional diameters are calculated from the mathematically-derived points along the fitted curves. Spurious profiles, caused by sectioning at bifurcations, can be overridden by an operator-interactive subroutine. Taper is derived from the slope of the least-squares fit of vessel caliber with respect to its distance along the arterial segment. Results obtained by calculations from the computer-assisted caliber measurements were compared with those obtained by hand-tracing the same vessel segments. Correlation between computer-traced inflection points and hand-traced taper was very significant (r = .96, n = 13, P less than 0.001). |
| Databáze: | OpenAIRE |
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