1.Pitfalls of Fetal Echocardiography.
Journal of the Korean Pediatric Cardiology Society 2002;6(2):127-132
No Abstract available.
Echocardiography*
2.Intraoperative Echocardiography.
Journal of the Korean Society of Echocardiography 2000;8(1):7-13
No abstract available.
Echocardiography*
3.Fetal Echocardiography : Where Are We?.
Journal of the Korean Pediatric Society 2001;44(3):279-284
No abstract available.
Echocardiography*
4.Strain and Strain Rate Echocardiography.
Journal of the Korean Society of Echocardiography 2002;10(2):13-18
No abstract available.
Echocardiography*
5.Myocardial Contrast Echocardiography.
Journal of the Korean Society of Echocardiography 2001;9(1):6-9
No abstract available.
Echocardiography*
7.New Development in Fetal Echocardiography.
Journal of the Korean Pediatric Cardiology Society 2002;6(1):16-22
No Abstract available.
Echocardiography*
8.Assessment of the Accuracy of Digitally Recorded Velocity Information of Color Doppler Flow Mapping:in vitro Validation Using a Flow Phantom.
Jae Kwan SONG ; Duk Hyun KANG ; Mark D HANDSCHUMACHER ; Robert A LEVINE
Korean Circulation Journal 1999;29(4):429-439
BACKGROUND: Qunatitation of blood flow within the cardiac chambers has been tried using digitally recorded velocity information of color Doppler flow mapping (CDFM). However, the accuracy of CDFM has not been systematically assessed. The purpose of the study was to test the accuracy of digitally recorded velocity information obtained through CDFM. Method: Using the American Society of Echocardiography flow phantom, an in vitro steady flow experiment was performed. Eight different flow fields through the phantom (84, 139, 172, 192, 232, 237, 244, 436 mL/sec) were imaged by CDFM using Hewlett Packard Sonos 2500 and all data were stored in the magneto-optical disc. Multiple aliases were visible and 7 different Nyquist limits (17, 23, 27, 37, 42, 53, 58 cm/sec) were used for recording. A fully automatic computer algorithm was used to unwrap the aliases and to convert the CDFM to digital velocity. Among 9 consecutive values at each pixel along the centerline of the phantom, median value was chosen as a representative value, which was compared to the actual value. RESULTS: In the slow velocity region, CDFM tends to overestimate the true velocity, whereas in the fast velocity region, it underestimates. At the aliasing point of 2 times Nyquist limit, there is a marked turbulence and estimation of velocity is impossible;fter aliasing, velocity information of CDFM is totally unreliable. Velocity estimation of CDFM is the most accurate at the velocity region of the Nyquist limit and shows reasonable accuracy between 0.5 x Nyquist limit and 1.5 x Nyquist limit with the error of estimation less than 15%. Conclusion: Velocity information of CDFM is accurate in the limited region and is dependent on the Nyquist limit of each measurement;this can be explained by the effect of wall filter. Baseline-shift of CDFM should be limited to the region between 0.5 x Nyquist limit and 1.5 x Nyquist limit for accurate quantitation using velocity information of CDFM.
Echocardiography
9.Echocardiography.
Korean Journal of Anesthesiology 1990;23(2):109-115
No abstract available.
Echocardiography*
10.Echocardiographic Evaluation of Valvular Regurgitation: Semiquantitation Based on the Color Flow is Enough in Everyday Clinical Practice?.
Korean Circulation Journal 1999;29(10):1144-1150
No abstract available.
Echocardiography*
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