| Autor: |
Johan C.H. Schuurbiers, C. J. Slager, Johan H. C. Reiber, Geert T. Meester |
| Rok vydání: |
1978 |
| Předmět: |
|
| Zdroj: |
Computers and biomedical research, an international journal. 11(5) |
| ISSN: |
0010-4809 |
| Popis: |
An operator-interactive dedicated hard-wired system which allows the automatic detection of the left ventricular outline in real time is evaluated using 29 left ventricular angiograms in RAO projection, randomly selected as a representative set taken from our clinical files. In 17 angiograms the film quality was such that the left ventricular contours could be processed automatically over two cardiac cycles, whereas only one cardiac cycle was processed in the other 12 angiograms due to low contrast in the second cycle. The average number of corrections per processed frame was 0.5 ± 0.3 (man ± SD) for the double-cycle films and 0.8 ± 0.4 for the single-cycle films. The percentages of corrected frames requiring small unimportant corrections with a resulting calculated volume change of less than 5% for the double- and single-cycle films are 45.2% and 55.4%, respectively. The average processing time T per cine frame for the double- and single-cycle films is T = 2.9 + 6 N sec and T = 4.5 + 6.7 N sec, respectively, where N is the number of applied corrections per frame. The processing time is mainly determined by the operator's decision and interaction speed. For such an automated left ventricular contour detector to have clinical significance the operator must make the final decision as to the acceptability of the detected outline. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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