### Abstract

To examine whether ejection fraction can be estimated by videodensitometric analysis of contrast washout from a chamber, a model was constructed consisting of a 60-ml syringe and a modified Harvard respirator. Ejection fraction could be adjusted mechanically. Echocardiographic images were recorded on videotape and analyzed on an offline computerized analysis system. To calibrate the relationship between target concentration and videodensity on our sector scanner-videodensity analysis system, we used a phantom with constant attenuation and eight cones with known, varying relative scatterer concentration. The time-gain-compensation curve was kept constant on the ultrasound instrument and videodensity was measured from videotapes by an offline computer system. In the image of each cone, a 10 x 70 pixel operator-designated region of interest was chosen, and mean videodensity/pixel (256 level gray scale) was calculated. A logarithmic relation was found between scatterer concentration and videodensity. This excellent log relationship existed at all three gain levels studied: at 40% of maximum gain, r = .96; at 50% gain, r = .99; and at 60% gain; r = .99 (all p < .001). Boluses of .5 ml sonicated Hypaque were then injected into the chamber and the contrast washout was recorded at ejection fractions of 20, 30, 40, 50, 60, and 70%. Bolus delivery and complete contrast mixing was attained except at ejection fraction 20%. Using the first two to four stroke videodensity decay the ejection fraction was calculated by estimating microbubble concentration decline using the logarithmic regression equation between videodensity and scatter concentration obtained during calibration. Mean ejection fractions of 23%, 33%, 42%, 52%, 61%, and 70% were obtained by videodensitometry. Linear regression showed a close correlation between calculated ejection fraction and true ejection fraction (r = .99). It is concluded that ejection fraction can be accurately obtained in vitro from contrast washout using videodensity after appropriate calibration.

Original language | English (US) |
---|---|

Pages (from-to) | 581-587 |

Number of pages | 7 |

Journal | Journal of Ultrasound in Medicine |

Volume | 7 |

Issue number | 10 |

DOIs | |

State | Published - Jan 1 1988 |

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### ASJC Scopus subject areas

- Radiological and Ultrasound Technology
- Radiology Nuclear Medicine and imaging

### Cite this

**Determination of ejection fraction from contrast echocardiography using videodensitometry in an in vitro model.** / Xie, F.; Meltzer, R. S.

Research output: Contribution to journal › Article

*Journal of Ultrasound in Medicine*, vol. 7, no. 10, pp. 581-587. https://doi.org/10.7863/jum.1988.7.10.581

}

TY - JOUR

T1 - Determination of ejection fraction from contrast echocardiography using videodensitometry in an in vitro model

AU - Xie, F.

AU - Meltzer, R. S.

PY - 1988/1/1

Y1 - 1988/1/1

N2 - To examine whether ejection fraction can be estimated by videodensitometric analysis of contrast washout from a chamber, a model was constructed consisting of a 60-ml syringe and a modified Harvard respirator. Ejection fraction could be adjusted mechanically. Echocardiographic images were recorded on videotape and analyzed on an offline computerized analysis system. To calibrate the relationship between target concentration and videodensity on our sector scanner-videodensity analysis system, we used a phantom with constant attenuation and eight cones with known, varying relative scatterer concentration. The time-gain-compensation curve was kept constant on the ultrasound instrument and videodensity was measured from videotapes by an offline computer system. In the image of each cone, a 10 x 70 pixel operator-designated region of interest was chosen, and mean videodensity/pixel (256 level gray scale) was calculated. A logarithmic relation was found between scatterer concentration and videodensity. This excellent log relationship existed at all three gain levels studied: at 40% of maximum gain, r = .96; at 50% gain, r = .99; and at 60% gain; r = .99 (all p < .001). Boluses of .5 ml sonicated Hypaque were then injected into the chamber and the contrast washout was recorded at ejection fractions of 20, 30, 40, 50, 60, and 70%. Bolus delivery and complete contrast mixing was attained except at ejection fraction 20%. Using the first two to four stroke videodensity decay the ejection fraction was calculated by estimating microbubble concentration decline using the logarithmic regression equation between videodensity and scatter concentration obtained during calibration. Mean ejection fractions of 23%, 33%, 42%, 52%, 61%, and 70% were obtained by videodensitometry. Linear regression showed a close correlation between calculated ejection fraction and true ejection fraction (r = .99). It is concluded that ejection fraction can be accurately obtained in vitro from contrast washout using videodensity after appropriate calibration.

AB - To examine whether ejection fraction can be estimated by videodensitometric analysis of contrast washout from a chamber, a model was constructed consisting of a 60-ml syringe and a modified Harvard respirator. Ejection fraction could be adjusted mechanically. Echocardiographic images were recorded on videotape and analyzed on an offline computerized analysis system. To calibrate the relationship between target concentration and videodensity on our sector scanner-videodensity analysis system, we used a phantom with constant attenuation and eight cones with known, varying relative scatterer concentration. The time-gain-compensation curve was kept constant on the ultrasound instrument and videodensity was measured from videotapes by an offline computer system. In the image of each cone, a 10 x 70 pixel operator-designated region of interest was chosen, and mean videodensity/pixel (256 level gray scale) was calculated. A logarithmic relation was found between scatterer concentration and videodensity. This excellent log relationship existed at all three gain levels studied: at 40% of maximum gain, r = .96; at 50% gain, r = .99; and at 60% gain; r = .99 (all p < .001). Boluses of .5 ml sonicated Hypaque were then injected into the chamber and the contrast washout was recorded at ejection fractions of 20, 30, 40, 50, 60, and 70%. Bolus delivery and complete contrast mixing was attained except at ejection fraction 20%. Using the first two to four stroke videodensity decay the ejection fraction was calculated by estimating microbubble concentration decline using the logarithmic regression equation between videodensity and scatter concentration obtained during calibration. Mean ejection fractions of 23%, 33%, 42%, 52%, 61%, and 70% were obtained by videodensitometry. Linear regression showed a close correlation between calculated ejection fraction and true ejection fraction (r = .99). It is concluded that ejection fraction can be accurately obtained in vitro from contrast washout using videodensity after appropriate calibration.

UR - http://www.scopus.com/inward/record.url?scp=0023755229&partnerID=8YFLogxK

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U2 - 10.7863/jum.1988.7.10.581

DO - 10.7863/jum.1988.7.10.581

M3 - Article

C2 - 3225889

AN - SCOPUS:0023755229

VL - 7

SP - 581

EP - 587

JO - Journal of Ultrasound in Medicine

JF - Journal of Ultrasound in Medicine

SN - 0278-4297

IS - 10

ER -